STATE STANDARD
USSR UNION
LARGE VOLUME SEAMLESS STEEL CYLINDERS FOR GASES
ON I p< 24,5 МПа (250 кгс/см 2)
TECHNICAL CONDITIONS
GOST 9731-79
Official publication
PUBLISHING HOUSE OF STANDARDS Moscow
to GOST 9731-79* Seamless steel cylinders of large volume dyne gases on J®,< 24,5 МПа (250 кгс/см 2). Технические условия
* The amendment is valid only on the territory of the Russian Federation,
(NUS No. 8 of 2002)
UDC 68.076.5:669.14:006.354 VM Group
STATE STANDARD OF THE UNION
LARGE VOLUME SEAMLESS STEEL CYLINDERS FOR GASES AT 24.5 MPa (250 kgf/cm 5)
Technical specifications GOST
Steel seamless cylinders of large capacity 8731-78
for gases for P w c24.5 MPa (12150 kgf/cm 2)
Date of introduction 01/01/81 in tea p, 2.2 01/01/85
This standard applies to cylinders made of carbon and alloy steel, made of seamless pipes and intended for storage and transportation of compressed and liquefied gases at ambient temperatures from minus 50 to plus 60 ° C.
1. TYPES, MAIN PARAMETERS AND DIMENSIONS
1.1. Cylinders must be manufactured in the following designs:
1 - single-neck with internal thread with a spherical bottom (Fig. 1);
2 - double-neck with internal thread (Fig. 2);
3 - single-neck with external thread and flange, with a spherical bottom (Fig. 3);
4 - double-neck with external threads and flanges (Fig. 4).
1.2. The main parameters and dimensions of the cylinders must correspond to those indicated in Fig. 1-4 and in table. 1 (for cylinders: carbon steel) and table. 2 (for alloy steel cylinders).
Official publication Reproduction prohibited
© Standards Publishing House, 1979 © Standards Publishing House, 1994 Reissue with changes
S. 2 GOST 9721-7"
|
Outer |
Cylinder body length Nominal L, mm |
Weight of cylinders M, kg |
|||||||||||
|
cenlindriches- |
Working pressure Р р, MPa (kgf/cm%) |
||||||||||||
|
which part, D„. them | |||||||||||||
Notes to the table 1-2:
1. At the customer's request, cylinders with a volume of 80-3210 l are manufactured in normal or reduced length. The top line in the table refers to the parameters of cylinders of normal length, the bottom line - to reduced length.
2, At the customer’s request, cylinders can be made double-necked with one plugged neck
GOST ®731-79 p. A
|
Outdoor TSYALNNDRICHAS-KOY CIOGI |
Cylinder body length nominal, mm |
Cylinder wall thickness s, mm, not less |
Mayev a cylinders M, kg |
|||||||
|
Working pressure P g MPa (kgf/cm 2) |
||||||||||
(Changed edition, Rev. No.
S. 4 GOST *T81-7"
1.3. Maximum deviations should not exceed:
by volume... . . . |
along the outer diameter of the cylindrical part: for cylinders made of carbon steel for cylinders made of alloy steel. at the transition points from cylinder to sphere. by length (instead of volume limitation).
±1.5% ±2.0% ±2.5% ±3%.
1.4. At the customer's request, alloy steel cylinders must be manufactured with weight restrictions. The mass of the cylinder per 1 liter of actual volume should not exceed the nominal / m\
1-7-I by more than 10%. At the same time, the limitation on the volume of
Examples of the designation of Cylinder version 1 with a volume of 200 l for a pressure of 24.5 MPa (250 kgf/cm 2) made of alloy steel, with a mass limit for air:
Air cylinder 1-200-24.5 L-M GOST 9731-79 The same, reduced length:
Air cylinder of reduced length 1-200-24.5 L-M
GROWTH 9731-79
The same, version 2 made of carbon steel for air: Air cylinder 2-200-24.5 GOST 9731-79. (Changed edition, Amendment No. 1).
2. TECHNICAL REQUIREMENTS
2.1. Cylinders must be manufactured in accordance with the requirements of this standard and the “Rules for the Design and Safe Operation of Pressure Vessels” approved by the USSR Gosgortekhnadzor, according to working drawings approved in the prescribed manner.
2.2. Cylinders must be made from pipes that have undergone ultrasonic testing.
2.3. The mechanical properties of the cylinder material must be no less than those indicated in the table. 3.
Table 3
Continuation of the table. 3
Note. Impact strength at temperatures of minus 20 and minus 50 °C is determined by float for cylinders of each standard size.
2.4. The ovality of the cylinders must be within the permissible deviations in the outer diameter.
2.5. The outer and inner surfaces of the cylinders must be free of caps, holes, dulls, and cracks.
Elevations, depressions, risks, as well as dents from scale or tools and other minor defects, including compacted and open wrinkles on the inner surface of the necks and bottoms, should not bring the wall thickness of the cylinders beyond the minimum values indicated in the table. 1 and 2.
2.6. The outer and inner surfaces of the cylinders must be etched, shot blasted or sandblasted. Scale that has grown together with the metal and cannot be cleaned or knocked out is allowed.
2.7. Cylinders must be subjected to heat treatment:
carbon steel - normalization;
made of alloy steel - hardened and tempered.
The surface hardness of heat-treated alloy steel cylinders should not be HB 269-341.
2.6; 2.7. (Changed edition, Amendment No. 2).
2.8. Oxygen and hydrogen cylinders must be degreased. Before installing shut-off valves, cylinders must be additionally degreased at the consumer's site.
2.9. The necks of cylinders with internal threads must be made in accordance with the drawings. 5 and table. 4.
The number of thread turns with a full profile must be at least 10.
Beyond the minimum length of the threaded part, internal boring of the neck is allowed, without taking the wall thickness beyond the minimum values.
Table ♦
Dimensions, mm
(Changed edition, Amendment No. 1, 2).
2.10. Cylinder necks with external threads for flanges must be manufactured in accordance with the drawings. 6 and table. 5.
Table 5
Dimensions, mm
2.11. The thread of the necks and flanges is in accordance with GOST 9150-81 and GOST 24705-81. Maximum deviations - according to GOST 16093-81 8# and 7N.
It is allowed to chip and break the thread no more than Ve of the total number of turns on a length of no more than 73 times the circumference of each broken turn. Nicks and radial marks are not allowed on the sealing surface.
2.12. Flanges for cylinders must be made from heat-treated blanks (forgings, stampings, or rolled sections) in accordance with drawings. 7 and table. 6.
Table 6
Dimensions, mm
The mechanical properties of the flange material, determined on longitudinal samples, are given in Table. 7.
Table 7
(Changed edition, Amendment TA 1,2).
2.13. To prevent unscrewing, the flanges must be welded to the neck on the side adjacent to the cylinder sphere, or secured with a pin.
2.14. Cylinders must be sealed.
The bottoms of single-neck cylinders must be welded by electric welding.
Instead of welding for cylinders with a diameter of 426 and 465 mm, it is allowed to install in the center of the bottom a plug on the M52ХЗ-М80ХЗ thread with subsequent electric welding. The plugs must be made of steel grades 20, 25, 30, 35, 40 and 45 in accordance with GOST 1050-88 with a height of at least 25 mm.
Goujon thread - according to GOST 9150-81 and GOST 24705-81. Maximum deviations - 8g according to GOST 16093-81.
(Changed edition, Amendment No. 1).
2.15. The outer surface of the cylinders must be painted with bitumen-oil varnish, oil, enamel or nitro paint in accordance with GOST 9.402-80 with the 4th degree of purification. The paint color is selected depending on the gas being filled according to the table. 8. The paintwork must correspond to class 7 according to GOST 9.032-74.
Table S
Name of gas
Coloring of cylinders
Argon raw
Argon technical
Argon pure
Acetylene
Oil&Gas
Nitrous oxide Oxygen
Medical oxygen
Hydrogen sulfide
Sulfur dioxide
Carbon dioxide
Cyclopropane
All other flammable gases All other non-flammable gases
Dark green
Brown
Protective
Aluminum or light gray
Protective
Orange
Purple
(Changed edition, Amendment No. 2)*
2.16. Each cylinder with a volume of 100 liters or more must be accompanied by a passport in the form established by the Rules of the State Gorge-Gekhnadzor.
3. ACCEPTANCE RULES
3.1. Each cylinder must be subjected to acceptance tests for compliance with the requirements of paragraphs. 1.2; 1.3; 2.3; 2.4; 2.5; 2.6; 2.9; 2.10; 2.11; 2.12; 2.13; 2.14; 2.15; 2.16.
Notes:
1. Tensile and impact bending tests of the cylinder material are checked on 2 samples from a batch of cylinders.
2. Cylinders with two open necks are not subject to leak testing at the manufacturer.
(Changed edition, Amendment No. 1).
3.2. Cylinders are presented for acceptance in batches of up to 100 pcs. one type, one volume, one heat and heat treatment mode.
4. TEST METHODS
4.1. Testing the material of cylinders for tension and impact bending (clause 2.3) should be carried out on longitudinal samples cut from a section of pipe of the same melt from which these cylinders are made, which has undergone heat treatment together with the cylinders. For each type of test, at least two samples from the batch are selected.
(Changed edition, Rev., No. 1).
4.2. The tensile test should be carried out on short proportional specimens of type III in accordance with GOST 1497-84.
4.3. The impact bending test of cylinders with a wall thickness from 7 to 12 mm should be carried out on type 3 samples, cylinders with a wall thickness of more than 12 mm - on type 1 samples according to GOST 9454-78.
(Changed edition, Amendment No. 1).
4.4. Quality control of the heat treatment of cylinders (clause 2.7) should be carried out by measuring the hardness of the cylinders.
The surface hardness of the cylinders is measured according to GOST 9012-59.
4.5. The strength of the cylinders is checked by a hydraulic test, and the tightness is checked by a pneumatic test in accordance with the requirements of the “Rules for the design and safe operation of pressure vessels. The duration of hydraulic tests must be at least:
15 min - for cylinders at P 9 to 14.7 MPa<150 Krcjtu*} включительно;
90 min - for cylinders at P 9 up to 19.6 MPa (200 kgf/cm*) inclusive;
120 min - for cylinders with P over 19.6 MPa (200 kgf/cm i).
(Changed edition, Amendments No. 1,2).
4.6. The quality of threads on necks and flanges (clauses 2.9-2.11) is checked with gauges in accordance with GOST 2016-86. Flanges for cylinders* (clause 2.12) are tested in accordance with the requirements of GOST 9399-81.
4.7. The quality of the outer and inner surfaces of the cylinders* (clauses 2.5; 2.6) is checked by external inspection.
4.8. Checking the volume of cylinders (clause 1.2) is carried out by filling the cylinders with water to the base of the neck and then determining the volume or mass of water.
4.9. If the results of testing samples for tensile or impact strength do not comply with the requirements of this standard, repeated tests of a double number of samples must be carried out according to the type of test that showed underestimated results.
If the results of repeated tests are unsatisfactory, the cylinders must be subjected to repeated heat treatment, after which the mechanical properties are tested in the above order. No more than two repeated heat treatments are allowed. Additional tempering is not considered repeated heat treatment.
5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE
5.1. The following data must be clearly stamped on the spherical part at the neck of each cylinder:
manufacturer's trademark;
serial number of the cylinder according to the manufacturer’s numbering system;
date (month, year) of manufacture and testing;
type of heat treatment: N - normalization for carbon steel cylinders; W - hardening and tempering for cylinders made of alloy steel; working pressure (P) and test hydraulic pressure (I) in MPa (kgf/cm2);
nominal cylinder volume in l.
Note. According to the consumer's order, instead of the nominal volume, the cylinders must indicate its actual value with an accuracy of 1 liter.
actual mass of the cylinder in kg with an accuracy of 1 kg;
OTK stamp;
5.2. The inner surface of the cylinders must be protected from corrosion by filling with a volatile inhibitor.
(Changed edition, Amendment No. 1).
5.3. The external thread of the neck of the cylinders must be protected from damage by metal or polyethylene rings. The openings of the necks of cylinders with internal threads must be tightly closed with metal threaded plugs with rubber gaskets or polyethylene threaded plugs. The openings of the necks of cylinders with external threads are tightly closed with a polyethylene plug.
5.4. Each batch of cylinders must be accompanied by a document certifying the cylinders’ compliance with the requirements of this standard, which must indicate:
name of the manufacturer and its address;
number of cylinders and their numbers;-
results of hydraulic and pneumatic tests;
designation of this standard.
5.5. Cylinders are transported by all types of transport in accordance with the rules for the carriage of goods in force for this type of transport.
Transportation of cylinders by rail in wagon shipments is carried out with maximum use of the carrying capacity or capacity of the vehicle.
Transportation of cylinders - according to group Zh1 GOST 15150-69.
(Changed edition, Amendment No. 1).
5.5a. Transport marking with the application of main, additional and informational inscriptions - in accordance with GOST 14192-77.
(Introduced additionally, Amendment No. 1).
5.6. Storage of cylinders - according to group Z1 GOST 15150-69.
6. MANUFACTURER WARRANTY
6.1. The manufacturer must ensure that the cylinders comply with the requirements of this standard, subject to the operating, transportation and storage conditions established by this standard and the “Rules for the design and safe operation of pressure vessels”* approved by the USSR State Mining and Technical Supervision Authority.
6.2. The warranty period is 2.5 years from the date of putting the cylinders into operation.
(Changed edition, Amendment No. 1).
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the USSR Ministry of Ferrous Metallurgy
DEVELOPERS:
E. A. Bliznyukov, Ph.D. tech. sciences; M. M. Bernstein, Ph.D. tech. sciences; Ya. I. Litvinsky, Ph.D. tech. sciences; S. G. Belik; T. V. Beilinova, Ph.D. tech. Sci.
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated November 30, 1979 No. 4605
3. INSTEAD GOST 9731-61
4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
|
Item number |
|
|
GOST 9.032-74 | |
|
GOST 9.402-80 | |
|
GOST 1050-88 | |
|
GOST 1497-84 | |
|
GOST 2016-86 | |
|
GOST 5791-81 | |
|
GOST 7931-76 | |
|
GOST 9012-59 | |
|
GOST 9150-81 | |
|
GOST 9399-81 | |
|
GOST 9454-78 | |
|
GOST 14192-77 | |
|
GOST 15150-69 | |
|
GOST 16093-81 | |
|
GOST 24705-81 |
5. The validity period was lifted by decision of the Interstate
Military Council for Standardization, Metrology and Certification (IUS 2-93).
6. REISSUE (May 1994) with Amendments No. 1, 2, approved in December 1985, June 1990 (IUS 4-86, 10-90)
Editor I. V. Vinogradskaya Technical editor V. N. Prusakova Proofreader L. Ya. Mitrofanova
Delivered to set 04/15/94. Subp. in the oven 06/03/94. Uel. oven l. 0.93. Uel. cr.-ott. 0.93. _____Uch.-ed., l. 0.83. Shooting gallery 503 copies, C 1385.
Order of the Badge of Honor * Publishing house of standards, 107076, Moscow, Kolodezny per., 14. Kaluga printing house of standards, st. Moskovskaya, 256. Zak. 857
GOST 9731-79
Group B66
STATE STANDARD OF THE USSR UNION
LARGE SEAMLESS STEEL CYLINDERS
VOLUME FOR GASES AT 24.5 MPa (250 kgf/cm)
Specifications
Steel seamless cylinders of large capacity for gases
for 24.5 MPa (250 kgf/cm).
Specifications
Date of introduction 1981−01−01
in terms of clause 2.2 1985−01−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the USSR Ministry of Ferrous Metallurgy
DEVELOPERS:
E.A.Bliznyukov, Ph.D. tech. sciences; M. M. Bernstein, Ph.D. tech. sciences; Ya. I. Litvinsky, Ph.D. tech. sciences; S. G. Belik; T. V. Beilinova, Ph.D. tech. Sci.
2. APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee for Standards dated November 30, 1979 N 4605
3. INSTEAD GOST 9731-61
4. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS
| Designation of the referenced technical document | Item number |
| GOST 9.032−74 | 2.15 |
| GOST 9.402−80 | 2.15 |
| GOST 1050-88 | 2.14 |
| GOST 1497-84 | 4.2 |
| GOST 2016-86 | 4.6 |
| GOST 5791-81 | 5.2 |
| GOST 7931-76 | 5.2 |
| GOST 9012-59 | 4.4 |
| GOST 9150-81 | 2.11; 2.14 |
| GOST 9399-81 | 4.6 |
| GOST 9454-78 | 4.2 |
| GOST 14192-77 | 5.5a |
| GOST 15150-69 | 5.5; 5.6 |
| GOST 16093-81 | 2.11; 2.14 |
| GOST 24705-81 | 2.11; 2.14 |
5. The validity period was lifted by decision of the Interstate Council for Standardization, Metrology and Certification (IUS 2−93).
6. REISSUE (May 1994) with Amendments No. 1, 2, approved in December 1985, June 1990 (IUS 4−86, 10−90)
Amendment made by database manufacturer
This standard applies to cylinders made of carbon and alloy steel, made of seamless pipes and intended for storage and transportation of compressed and liquefied gases at ambient temperatures from minus 50 to plus 60 °C. Product safety requirements are set out in paragraphs 1.2, 1.3, 2.3, 2.7, 4.1−4.5, 4.8.
(Amendment. IUS N 8−2002).
1. TYPES, MAIN PARAMETERS AND DIMENSIONS
1.1. Cylinders must be manufactured in the following designs:
1 - single-neck with internal thread with a spherical bottom (Fig. 1);
2 - double-neck with internal thread (Fig. 2);
3 - single-neck with external thread and flange, with a spherical bottom (Fig. 3);
4 - double-neck with external threads and flanges (Fig. 4).
1.2. The main parameters and dimensions of the cylinders must correspond to those indicated in Fig. 1−4 and in Table 1 (for cylinders made of carbon steel) and Table 2 (for cylinders made of alloy steel).
Drawing 1−4
Damn.1 |
Damn.2 |
Damn.3 |
Damn.4 |
Table 1
Cylinder volume, l |
Outer diameter of cylinder |
Cylinder body length nominal, mm |
Weight of cylinders, kg |
||||||||||
| 9,8 (100) | 14,7 (150) | 19,6 (200) | 24,5 (250) | 9,8 (100) | 14,7 (150) | 19,6 (200) | 24,5 (250) | 9,8 (100) | 14,7 (150) | 19,6 (200) | 24,5 (250) | ||
| 80 | 325 | 1270 | 1330 | 1390 | 1460 | 6,8 | 10,0 | 13,1 | 16,1 | 90 | 130 | 175 | 220 |
| 377 | 1040 | 1080 | 1130 | 1180 | 7,9 | 11,7 | 15,2 | 18,7 | 100 | 150 | 205 | 250 | |
| 100 | 325 | 1550 | 1620 | 1690 | 1770 | 6,8 | 10,0 | 13,1 | 16,1 | 105 | 155 | 210 | 265 |
| 377 | 1230 | 1290 | 1340 | 1420 | 7,9 | 11,7 | 15,2 | 18,7 | 115 | 175 | 230 | 290 | |
| 130 | 325 | 1960 | 2050 | 2140 | 2240 | 6,8 | 10,0 | 13,1 | 16,1 | 130 | 190 | 255 | 330 |
| 377 | 1530 | 1600 | 1700 | 1760 | 7,9 | 11,7 | 15,2 | 18,7 | 140 | 210 | 290 | 360 | |
| 160 | 325 | 2370 | 2470 | 2580 | 2710 | 6,8 | 10,0 | 13,1 | 16,1 | 155 | 230 | 310 | 395 |
| 377 | 1820 | 1900 | 2020 | 2110 | 7,9 | 11,7 | 15,2 | 18,7 | 165 | 250 | 335 | 430 | |
| 200 | 325 | 2940 | 3060 | 3160 | 3350 | 6,8 | 10,0 | 13,1 | 16,1 | 190 | 290 | 375 | 490 |
| 377 | 2220 | 2340 | 2470 | 2550 | 7,9 | 11,7 | 15,2 | 18,7 | 200 | 305 | 400 | 510 | |
| 250 | 377 | 2760 | 2850 | 3010 | 3150 | 7,9 | 11,7 | 15,2 | 18,7 | 235 | 365 | 480 | 625 |
| 426 | 2260 | 2380 | 2500 | 2620 | 9,0 | 13,2 | 17,2 | 21,1 | 255 | 375 | 525 | 665 | |
| 320 | 426 | 2820 | 2965 | 3120 | 3260 | 9,0 | 13,2 | 17,2 | 21,1 | 315 | 465 | 650 | 820 |
| 465 | 2530 | 2570 | 2725 | 2840 | 9,8 | 14,4 | 18,8 | 23,0 | 400 | 485 | 670 | 840 | |
| 400 | 465 | 3075 | 3130 | 3240 | 3420 | 9,8 | 14,4 | 18,8 | 23,0 | 480 | 600 | 810 | 1030 |
| 500 | 465 | 3730 | 3810 | 4000 | 4220 | 9,8 | 14,4 | 18,8 | 23,0 | 580 | 725 | 970 | 1240 |
Notes to table 1−2:
1. At the customer’s request, cylinders with a volume of 80−320 l are manufactured in normal or reduced length. The top line in the table refers to the parameters of cylinders of normal length, the bottom line - to reduced length.
2. At the customer's request, cylinders can be made double-necked with one plugged neck.
table 2
Cylinder volume, l |
Outer diameter of cylinder |
Cylinder body length nominal, mm | Cylinder wall thickness, mm, not less |
Weight of cylinders, kg |
|||||||
Working pressure, MPa (kgf/cm) |
|||||||||||
| 14,7 (150) | 19,6 (200) | 24,5 (250) | 14,7 (150) | 19,6 (200) | 24,5 (250) | 14,7 (150) | 19,6 (200) | 24,5 (250) | |||
| 80 | 325 | 1280 | 1280 | 1350 | 7,0 | 8,8 | 10,9 | 90 | 110 | 140 | |
| 377 | 1020 | 1050 | 1100 | 7,9 | 10,2 | 12,7 | 100 | 125 | 160 | ||
| 100 | 325 | 1560 | 1560 | 1630 | 7,0 | 8,8 | 10,9 | 105 | 130 | 170 | |
| 377 | 1230 | 1260 | 1320 | 7,9 | 10,2 | 12,7 | 115 | 145 | 190 | ||
| 130 | 325 | 1970 | 1970 | 2060 | 7,0 | 8,8 | 10,9 | 130 | 165 | 210 | |
| 377 | 1540 | 1570 | 1630 | 7,9 | 10,2 | 12,7 | 140 | 180 | 230 | ||
| 160 | 325 | 2380 | 2380 | 2480 | 7,0 | 8,8 | 10,9 | 155 | 195 | 250 | |
| 377 | 1830 | 1880 | 1940 | 7,9 | 10,2 | 12,7 | 165 | 210 | 270 | ||
| 200 | 325 | 2930 | 2930 | 3060 | 7,0 | 8,8 | 10,9 | 190 | 240 | 305 | |
| 377 | 2230 | 2290 | 2380 | 7,9 | 10,2 | 12,7 | 200 | 255 | 325 | ||
| 250 | 377 | 2720 | 2800 | 2900 | 7,9 | 10,2 | 12,7 | 235 | 305 | 390 | |
| 426 | 2200 | 2300 | 2370 | 9,2 | 11,5 | 14,2 | 255 | 325 | 405 | ||
| 320 | 426 | 2750 | 2870 | 2950 | 9,2 | 11,5 | 14,2 | 315 | 400 | 500 | |
| 465 | 2550 | 2550 | 2610 | 10,2 | 13,0 | 15,6 | 350 | 440 | 540 | ||
| 400 | 465 | 2970 | 3040 | 3100 | 10,2 | 13,0 | 15,6 | 415 | 530 | 655 | |
| 500 | 465 | 3770 | 3770 | 3850 | 10,2 | 13,0 | 15,6 | 505 | 640 | 800 | |
1.3. Maximum deviations should not exceed:
by volume… ±5%
along the outer diameter of the cylindrical part:
for carbon steel cylinders…±1.5%
for alloy steel cylinders…±2.0%
in places of transition from cylinder to sphere ... ±2.5%
along the length (instead of the volume limitation) ... ±3%.
1.4. At the customer's request, alloy steel cylinders must be manufactured with weight restrictions. The mass of the cylinder per 1 liter of actual volume should not exceed the nominal one by more than 10%. In this case, the volume limitation is removed.
Examples of symbols
Cylinder version 1 with a volume of 200 l for a pressure of 24.5 MPa (250 kgf/cm) made of alloy steel, with a weight limit for air:
Air cylinder 1−200−24.5 L-M GOST 9731-79
The same, reduced length:
Air cylinder of reduced length 1−200−24.5 L-M GOST 9731-79
The same, version 2 made of carbon steel for air:
Air cylinder 2−200−24.5 GOST 9731-79.
2. TECHNICAL REQUIREMENTS
2.1. Cylinders must be manufactured in accordance with the requirements of this standard and the “Rules for the Design and Safe Operation of Pressure Vessels” approved by the USSR Gosgortekhnadzor, according to working drawings approved in the prescribed manner.
2.2. Cylinders must be made from pipes that have undergone ultrasonic testing.
2.3. The mechanical properties of the cylinder material must be no less than those indicated in Table 3.
Table 3
| The name of indicators |
Carbon steel |
Alloy steel |
Tensile strength, MPa (kgf/mm) |
638 (65) | 883 (90) |
Yield strength, MPa (kgf/mm) |
373 (38) | 687 (70) |
Relative extension , % |
15 | 13 |
Impact strength KCU, J/m(kgf/cm) at temperature: |
||
| +20°С | ||
| -20°С | - | |
| -50°С | - |
Note. Impact strength at temperatures of minus 20 and minus 50 °C is determined by float for cylinders of each standard size.
2.4. The ovality of the cylinders must be within the permissible deviations in the outer diameter.
2.5. The outer and inner surfaces of the cylinders must be free of caps, holes, dulls, and cracks.
Elevations, depressions, risks, as well as dents from scale or tools and other minor defects, including compacted and open wrinkles on the inner surface of the necks and bottoms, should not bring the wall thickness of the cylinders beyond the minimum values indicated in Tables 1 and 2.
2.6. The outer and inner surfaces of the cylinders must be etched, shot blasted or sandblasted. Scale that has grown together with the metal and cannot be cleaned or knocked out is allowed.
2.7. Cylinders must be subjected to heat treatment:
carbon steel - normalization;
from alloy steel - hardening and tempering.
The surface hardness of heat-treated alloy steel cylinders should not be HB 269−341.
2.6; 2.7. (Changed edition, Amendment No. 2).
2.8. Oxygen and hydrogen cylinders must be degreased. Before installing shut-off valves, cylinders must be additionally degreased at the consumer's site.
2.9. Cylinder necks with internal threads must be made in accordance with Figure 5 and Table 4.
The number of thread turns with a full profile must be at least 10.
Beyond the minimum length of the threaded part, internal boring of the neck is allowed, without taking the wall thickness beyond the minimum values.
Damn.5
Table 4
Dimensions, mm
Cylinder diameter |
Not less for pressure, MPa (kgf/cm) |
No less |
|||||||
| 9,8−14,7 (100−150) |
19,6−24,5 (200−250) |
Prev, off ±0.5 | |||||||
| 325; 377 | 70 | 77 | 40 | 62 | 54 | 5 | 5 | 2 | |
| 426; 465 | 105 | 120 | 60 | 92 | 82 | 5 | 5 | 2,5 | |
(Changed edition, Amendment No. 1, 2).
2.10. Cylinder necks with external threads for flanges must be made in accordance with Figure 6 and Table 5.
Damn.6
Table 5
Dimensions, mm
Cylinder diameter |
(prev, off -4) |
(limit off +5) |
(limit deviation ±0.5) |
|||
| 325; 377; 426; 465 | 98 | 90 | 55 | 5 | 2,5 |
2.11. The thread of the necks and flanges is in accordance with GOST 9150-81 and GOST 24705-81. Maximum deviations - according to GOST 16093-81 8g and 7N.
It is allowed to chip and break the thread of no more than the total number of turns on a length not exceeding the circumference of each broken turn. Nicks and radial marks are not allowed on the sealing surface.
(Changed edition, Amendment No. 1).
2.12. Flanges for cylinders must be made from heat-treated blanks (forgings, stampings, or rolled sections) in accordance with Figure 7 and Table 6.
Damn.7
Table 6
Dimensions, mm
Cylinder diameter |
(limit deviation ±0.3) |
Number of holes |
|||||
prev off 14 |
|||||||
| 325; 377; 426; 465 |
185 | 245 | 55 | 2,5 | 1,0 | 8 | |
The mechanical properties of the flange material, determined on longitudinal samples, are given in Table 7.
Table 7
| steel grade | Chemical composition | Tensile strength, N/mm(kgf/mm) |
Yield strength, N/mm(kgf/mm) |
Relative extension , % |
Impact strength KCU, J/cm(kgf m/cm) |
| Alloyed |
GOST 4543-71 | 618 (63) | 392 (40) | 15 | 59,6 |
(Changed edition, Amendment No. 1, 2).
2.13. To prevent unscrewing, the flanges must be welded to the neck on the side adjacent to the cylinder sphere, or secured with a pin.
2.14. Cylinders must be sealed.
The bottoms of single-neck cylinders must be welded by electric welding.
Instead of welding for cylinders with a diameter of 426 and 465 mm, it is allowed to install a plug on the M523-M803 thread in the center of the bottom, followed by electric welding. The plugs must be made of steel grades 20, 25, 30, 35, 40 and 45 in accordance with GOST 1050-88 with a height of at least 25 mm.
Goujon thread - according to GOST 9150-81 and GOST 24705-81. Maximum deviations - 8g according to GOST 16093-81.
(Changed edition, Amendment No. 1).
2.15. The outer surface of the cylinders must be painted with bitumen-oil varnish, oil, enamel or nitro paint in accordance with GOST 9.402−80 with the 4th degree of purification. The paint color is selected depending on the gas being filled according to Table 8. The paintwork must correspond to class 7 according to GOST 9.032−74.
Table 8
| Name of gas | Coloring of cylinders |
| Nitrogen | Black |
| Ammonia | Yellow |
| Argon raw | Black |
| Argon technical | Black |
| Argon pure | Gray |
| Acetylene | White |
| Butylene | Red |
| Oil&Gas | Gray |
| Butane | Red |
| Hydrogen | Dark green |
| Air | Black |
| Helium | Brown |
| Nitrous oxide | Gray |
| Oxygen | Blue |
| Medical oxygen | Blue |
| Hydrogen sulfide | White |
| Sulfur dioxide | Black |
| Carbon dioxide | Black |
| Phosgene | Protective |
| Freon | Aluminum or light gray |
| Chlorine | Protective |
| Cyclopropane | Orange |
| Ethylene | Purple |
| All other flammable gases | Red |
| All other non-flammable gases | Black |
(Changed edition, Amendment No. 2).
2.16. Each cylinder with a volume of 100 liters or more must be accompanied by a passport in the form established by the Gosgortekhnadzor Rules.
3. ACCEPTANCE RULES
3.1. Each cylinder must be subjected to acceptance tests for compliance with the requirements of paragraph 1.2; 1.3; 2.3; 2;4; 2.5; 2.6; 2.9; 2.10; 2.11; 2.12; 2.13; 2.14; 2.15; 2.16.
Notes:
1. Tensile and impact bending tests of the cylinder material are checked on 2 samples from a batch of cylinders.
2. Cylinders with two open necks are not subjected to leak testing at the manufacturer.
(Changed edition, Amendment No. 1).
3.2. Cylinders are presented for acceptance in batches of up to 100 pcs. one type, one volume, one heat and heat treatment mode.
4. TEST METHODS
4.1. Testing the material of cylinders for tension and impact bending (clause 2.3) should be carried out on longitudinal samples cut from a section of pipe of the same melt from which these cylinders are made, which has undergone heat treatment together with the cylinders. For each type of test, at least two samples from the batch are selected.
(Changed edition, Amendment No. 1).
4.2. The tensile test should be carried out on short proportional specimens of type III in accordance with GOST 1497-84.
4.3. The impact bending test of cylinders with a wall thickness from 7 to 12 mm should be carried out on type 3 samples, cylinders with a wall thickness of more than 12 mm - on type 1 samples according to GOST 9454-78.
(Changed edition, Amendment No. 1).
4.4. Quality control of the heat treatment of cylinders (clause 2.7) should be carried out by measuring the hardness of the cylinders.
The surface hardness of the cylinders is measured according to GOST 9012-59.
4.5. The strength of the cylinders is checked by a hydraulic test, and the tightness is checked by a pneumatic test in accordance with the requirements of the “Rules for the Design and Safe Operation of Pressure Vessels”. The duration of hydraulic tests must be at least:
15 min - for cylinders up to 14.7 MPa (150 kgf/cm) inclusive;
90 min - for cylinders up to 19.6 MPa (200 kgf/cm) inclusive;
120 min - for cylinders over 19.6 MPa (200 kgf/cm).
(Changed edition, Amendment No. 1, 2).
4.6. The quality of threads on necks and flanges (clauses 2.9−2.11) is checked with gauges in accordance with GOST 2016-86. Flanges for cylinders (clause 2.12) are tested in accordance with the requirements of GOST 9399-81.
4.7. The quality of the outer and inner surfaces of the cylinders (clauses 2.5; 2.6) is checked by external inspection.
4.8. Checking the volume of cylinders (clause 1.2) is carried out by filling the cylinders with water to the base of the neck and then determining the volume or mass of water.
4.9. If the results of testing samples for tensile or impact strength do not comply with the requirements of this standard, repeated tests of a double number of samples must be carried out according to the type of test that showed underestimated results.
If the results of repeated tests are unsatisfactory, the cylinders must be subjected to repeated heat treatment, after which the mechanical properties are tested in the above order. No more than two repeated heat treatments are allowed. Additional tempering is not considered repeated heat treatment.
5. LABELING, PACKAGING, TRANSPORTATION AND STORAGE
5.1. The following data must be clearly stamped on the spherical part at the neck of each cylinder:
manufacturer's trademark;
serial number of the cylinder according to the manufacturer’s numbering system;
date (month, year) of manufacture and testing;
type of heat treatment: — normalization for carbon steel cylinders; — hardening and tempering for cylinders made of alloy steel; working pressure (P) and test hydraulic pressure (P) in MPa (kgf/cm);
nominal cylinder volume in l.
Note. According to the consumer’s order, instead of the nominal volume, the cylinders must indicate its actual value with an accuracy of 1 liter,
actual mass of the cylinder in kg with an accuracy of 1 kg;
OTK stamp;
5.2. The inner surface of the cylinders must be protected from corrosion by filling with a volatile inhibitor.
(Changed edition, Amendment No. 1).
5.3. The external thread of the neck of the cylinders must be protected from damage by metal or polyethylene rings. The openings of the necks of cylinders with internal threads must be tightly closed with metal threaded plugs with rubber gaskets or polyethylene threaded plugs. The openings of the necks of cylinders with external threads are tightly closed with a polyethylene plug.
5.4. Each batch of cylinders must be accompanied by a document certifying the cylinders’ compliance with the requirements of this standard, which must indicate:
name of the manufacturer and its address;
number of cylinders and their numbers;
results of hydraulic and pneumatic tests;
designation of this standard.
5.5. Cylinders are transported by all types of transport in accordance with the rules for the carriage of goods in force for this type of transport.
Transportation of cylinders by rail in wagon shipments is carried out with maximum use of the carrying capacity or capacity of the vehicle.
Transportation of cylinders - according to group Zh1 GOST 15150-69.
(Changed edition, Amendment No. 1).
5.5a. Transport marking with the application of main, additional and informational inscriptions - in accordance with GOST 14192-77.
(Introduced additionally, Amendment No. 1).
5.6. Cylinder storage is according to group Zh1 GOST 15150-69.
6. MANUFACTURER WARRANTY
6.1. The manufacturer must ensure that the cylinders comply with the requirements of this standard, subject to the operating, transportation and storage conditions established by this standard and the “Rules for the design and safe operation of pressure vessels” approved by the USSR State Technical Supervision Authority.
6.2. The warranty period is 2.5 years from the date of putting the cylinders into operation.
(Changed edition, Amendment No. 1).
V, lOuter diameter of the cylindrical part,D n, mm
Cylinder body length nominalL, mm
Cylinder wall thicknesss, mm, no less
Cylinder weight M, kg
Operating pressure R p, MPa (kgf/cm 2)
9,8 (100)
14,7 (150)
19,6 (200)
24,5 (250)
9,8 (100)
14,7 (150)
19,6 (200)
24,5 (250)
9,8 (100)
14,7 (150)
19,6 (200)
24,5 (250)
1270
1330
1390
1460
10,0
13,1
16,1
1040
1080
1130
1180
11,7
15,2
18,7
1550
1620
1690
1770
10,0
13,1
16,1
1230
1290
1340
1420
11,7
15,2
18,7
1960
2050
2140
2240
10,0
13,1
16,1
1530
1600
1700
1760
11,7
15,2
18,7
2370
2470
2580
2710
10,0
13,1
16,1
1820
1900
2020
2110
11,7
15,2
18,7
2940
3060
3160
3350
10,0
13,1
16,1
2220
2340
2470
2550
11,7
15,2
18,7
2760
2850
3010
3150
11,7
15,2
18,7
2260
2380
2500
2620
13,2
17,2
21,1
2820
2965
3120
3260
13,2
17,2
21,1
2530
2570
2725
2840
14,4
18,8
23,0
3075
3130
3240
3420
14,4
18,8
23,0
1030
3730
3810
4000
4220
14,4
18,8
23,0
1240
Notes e. Impact strength at temperatures of minus 20 and minus 50 °C is determined by float for cylinders of each standard size. Dimensions, mm
|
Approved Resolution of the USSR State Committee on Standards of November 30, 1979 N 4605
State standard of the USSR GOST 9731-79*
"LARGE VOLUME SEAMLESS STEEL CYLINDERS FOR GASES P p ≤24.5 MPa (250 kgf/cm2). TECHNICAL CONDITIONS"
Steel seamless cylinders of large capacity lor gases for P w ≤24.5 MPa (250 kgf/cm 2). Specifications
Instead of GOST 9731-61
Information data
1. Developed and introduced by the USSR Ministry of Ferrous Metallurgy
Developers:
E.A. Bliznyukov, Ph.D. tech. sciences; MM. Bernstein, Ph.D. tech. sciences; ME AND. Litvinsky, Ph.D. tech. sciences; S.G. Belik; T.V. Beilinova, Ph.D. tech. Sci.
2. Approved and put into effect by Decree of the USSR State Committee on Standards dated November 30, 1979 N 4605
3. Instead of GOST 9731-61
4. Reference regulatory and technical documents
|
Item number |
|
|
GOST 9.032-74 | |
|
GOST 9.402-80 | |
|
GOST 1050-88 | |
|
GOST 1497-84 | |
|
GOST 2016-86 | |
|
GOST 5791-81 | |
|
GOST 7931-76 | |
|
GOST 9012-59 | |
|
GOST 9150-81 | |
|
GOST 9399-81 | |
|
GOST 9454-78 | |
|
GOST 14192-77 | |
|
GOST 15150-69 | |
|
GOST 16093-81 | |
|
GOST 24705-81 |
5. The validity period was lifted by decision of the Interstate Council for Standardization, Metrology and Certification (IUS 2-93).
6. Reissue (May 1994) with Amendments No. 1, 2, approved in December 1985, June 1990 (IUS 4-86, 10-90)
This standard applies to cylinders made of carbon and alloy steel, made of seamless pipes and intended for storage and transportation of compressed and liquefied gases at ambient temperatures from minus 50 to plus 60 ° C.
Product safety requirements are set out in clauses 1.2, 1.3, 2.7, 4.1 - 4.5, 4.8.
1. Types, main parameters and sizes
1.1. Cylinders must be manufactured in the following designs:
1 - single-neck with internal thread with a spherical bottom (Fig. 1);
2 - double-neck with internal thread (Fig. 2);
3 - single-neck with external thread and flange, with a spherical bottom (Fig. 3);
4 - double-neck with external threads and flanges (Fig. 4).
1.2. The main parameters and dimensions of the cylinders must correspond to those indicated in Fig. 1 - 4 and in table. 1 (for carbon steel cylinders) and table. 2 (for alloy steel cylinders).
 |
|||
Table 1
|
Cylinder volume V, l |
Outer. cylindrical part, |
Cylinder body length nominal L, mm |
Cylinder wall thickness S, mm, not less |
Cylinder weight M, kg |
|||||||||
Notes to the table 12:
1. At the customer's request, cylinders with a volume of 80 - 320 l are manufactured in normal or reduced length. The top line in the table refers to the parameters of cylinders of normal length, the bottom line - to reduced length.
2. By order of the fighter, double-neck cylinders with one plugged neck can be manufactured
table 2
|
Cylinder volume V, l |
Outer cylindrical part, |
Cylinder body length nominal, mi |
Cylinder wall thickness s, mm, not less |
Weight of cylinders M, kg |
||||||
|
Working pressure P p, MPa (kgf/cm2) |
||||||||||
1.3. Maximum deviations should not exceed:
By volume........................................................ .± 5%
along the outer diameter of the cylindrical part:
For carbon cylinders................................± 1.5%
For alloy steel cylinders........................ ± 2.0%
At the transition points from cylinder to sphere...................± 2.5%
By length (instead of volume limitation) ...................± 3%.
1.4, At the customer's request, alloy steel cylinders must be manufactured with weight restrictions. The mass of the cylinder per 1 liter of actual volume should not exceed the nominal one by more than 10%. In this case, the volume limitation is removed.
Examples of the designation of Cylinder version 1 with a volume of 200 l for a pressure of 24.5 MPa (250 kgf/cm2) made of alloy steel, with a mass limit for air:
Air cylinder 1-200-24, 5 L-M GOST 9731-79
The same, reduced length:
Air cylinder of reduced length 1-200-24.5 L-M
GOST 9731-79
The same, version 2 made of carbon steel for air:
Air cylinder 2-200-24, 5 GOST 9731-79.
2. Technical requirements
2.1. Cylinders must be manufactured in accordance with the requirements of this standard and the “Rules for the design and safe operation of pressure vessels” approved by the USSR Gosgortekhnadzor, according to working drawings approved in the prescribed manner.
2.2. Cylinders must be made from pipes that have undergone ultrasonic testing.
2.3. The mechanical properties of the cylinder material must be no less than those indicated in the table. 3.
Table 3
|
The name of indicators |
Made from carbon |
From alloyed |
|
|
Tensile strength σ in, MPa (kgf/cm 2) | |||
|
Yield strength σ t, MPa (kgf/cm2) | |||
|
Relative elongation δ5,% | |||
|
Impact strength KCU, J/m 2 (kgf/cm 2) at temperature: | |||
Note. Impact strength at temperatures of minus 20 and minus 50°C is determined by float for cylinders of each standard size.
2.4. The ovality of the cylinders must be within the permissible deviations in the outer diameter.
2.5. The outer and inner surfaces of the cylinders must be free of caps, holes, dulls, and cracks.
Elevations, depressions, risks, as well as dents from scale or tools and other minor defects, including compacted and open wrinkles on the inner surface of the necks and bottoms, should not bring the wall thickness of the cylinders beyond the minimum values indicated in the table. 1 and 2.
2.6. The outer and inner surfaces of the cylinders must be etched, shot blasted or sandblasted. Scale that has grown together with the metal and cannot be cleaned or knocked out is allowed.
2.7. Cylinders must be subjected to heat treatment:
carbon steel - normalization;
made of alloy steel - hardened and tempered.
The surface hardness of heat-treated alloy steel cylinders should not be HB 269-341.
2.6; 2, 7. (Changed edition, Amendment No. 2).
2.8. Oxygen and hydrogen cylinders must be degreased. Before installing shut-off valves, cylinders must be additionally degreased at the consumer's site.
2.9. The necks of cylinders with internal threads must be made in accordance with the drawings. 5 and table. 4.
The number of thread turns with a full profile must be at least 10.
Beyond the minimum length of the threaded part, internal boring of the neck is allowed, without taking the wall thickness beyond the minimum values.
Table 4
|
Dimensions, mm |
|||||||||
|
Cylinder diameter, |
d, not less for pressures, MPa (kgf/cm2) | ||||||||
|
9, 8 - 14, 7 (100 - 150) |
19, 6 - 24.5 (200 - 250) |
Prev. off ±0.5 |
|||||||
(Changed edition, Amendment No. 1, 2).
2.10. The necks of cylinders with external threads for flanges must be made in accordance with the drawings. 6 and table. 5.
Table 5
|
Dimensions, mm | |||||||
|
Cylinder diameter |
(limit off - 4) |
(limit off + 5) |
(limit deviation ±0.5) | ||||
|
325; 377; 426; 465 | |||||||
2.11. Thread of necks and flanges - according to GOST 9150-81 and GOST 24705-81, Limit deviations - according to GOST 16093-81 8g and 7N.
It is allowed to chip and break the thread of no more than 1/5 of the total number of turns at a length of no more than 1/3 of the circumference of each broken turn. Nicks and radial marks are not allowed on the sealing surface.
(Changed version, Rev. 16 1).
2.12. Flanges for cylinders must be made from heat-treated blanks (forgings, stampings, or rolled sections) in accordance with drawings. 7 and table. 6.
Table 6
|
Dimensions, mm | ||||||||
|
Cylinder diameter D |
d 1 prev, off ±0.3) |
Number of holes |
||||||
|
prev off h 14 |
||||||||
The mechanical properties of the flange material, determined on longitudinal samples, are given in Table. 7.
Table 7
(Changed edition, Rev., N, 2),
2.13. To prevent unscrewing, the flanges must be welded to the neck on the side adjacent to the cylinder sphere, or secured with a pin.
2.14. Cylinders must be sealed.
The bottoms of single-neck cylinders must be welded by electric welding.
Instead of welding for cylinders with a diameter of 426 and 465 mm, it is allowed to install a plug on the M52X3-M80X3 thread in the center of the bottom, followed by electric welding. The plugs must be made of steel grades 20, 25, 30, 35, 40 and 45 in accordance with GOST 1050-88 with a height of at least 25 mm.
Goujon thread - according to GOST 9150-81 and GOST 24705-81. Maximum deviations - 8g according to GOST 16093-81.
(Changed edition, Amendment No. 1),
2.15. The outer surface of the cylinders must be painted with bitumen-oil varnish, oil, enamel or nitro paint in accordance with GOST 9.402-80 with the 4th degree of purification. The paint color is selected depending on the gas being filled according to the table. 8. The paintwork must correspond to class 7 according to GOST 9.032-74.
Table 8
|
Name of gas |
Coloring of cylinders |
|
Argon raw | |
|
Argon technical | |
|
Argon pure | |
|
Acetylene | |
|
Oil&Gas | |
|
Dark green |
|
|
Brown |
|
|
Nitrous oxide | |
|
Oxygen | |
|
Medical oxygen | |
|
Hydrogen sulfide | |
|
Sulfur dioxide | |
|
Carbon dioxide | |
|
Protective |
|
|
Aluminum or light gray |
|
|
Protective |
|
|
Cyclopropane |
Orange |
|
Purple |
|
|
All other flammable gases | |
|
All other non-flammable gases |
(Changed edition, Amendment No. 2).
2.16. Each cylinder with a volume of 100 liters or more must be accompanied by a passport in the form established by the Gosgortekhnadzor Rules.
3. Acceptance rules
3.1. Each cylinder must be subjected to acceptance tests for compliance with the requirements of paragraphs. 1.2; 1.3; 2.3; 2.4; 2.5; 2.6; 2.9; 2.10; 2.11; 2.12; 2.13; 2.14; 2.15; 2.16.
Notes:
1. Tensile and impact bending tests of the cylinder material are checked on 2 samples from a batch of cylinders.
2. Cylinders with two open necks are not tested for leaks at the manufacturer.
(Changed edition, Revised, No. 1).
3.2. Cylinders are presented for acceptance in batches of up to 100 pcs. one type, one volume, one heat and heat treatment mode.
4. Test methods
4.1. Testing the material of cylinders for tension and impact bending (clause 2.3) should be carried out on longitudinal samples cut from a section of pipe of the same melt from which these cylinders are made, which has undergone heat treatment together with the cylinders. For each type of test, at least two samples from the batch are selected.
(Changed edition, Amendment No. 1).
4.2. The tensile test should be carried out on short proportional specimens of type III in accordance with GOST 1497-84.
4.3. The impact bending test of cylinders with a wall thickness from 7 to 12 mm should be carried out on type 3 samples, cylinders with a wall thickness of more than 12 mm - on type I samples in accordance with GOST 9454-78.
(Changed edition, Amendment No. 1).
4.4. Quality control of the heat treatment of cylinders (clause 2.7) should be carried out by measuring the hardness of the cylinders.
The surface hardness of the cylinders is measured according to GOST 9012-59.
4.5. The strength of the cylinders is checked by a hydraulic test, and the tightness is checked by a pneumatic test in accordance with the requirements of the “Rules for the Design and Safe Operation of Pressure Vessels. The duration of hydraulic tests must be at least:
15 min - for cylinders at P p up to 14.7 MPa (150 kgf/cm2) inclusive;
90 min - for cylinders at P p up to 19.6 MPa (200 kgf/cm2) inclusive;
120 min - for cylinders with P p over 19.6 MPa (200 kgf/cm 2)
(Changed edition, Amendment No. 1, 2).
4.6. The quality of threads on necks and flanges (clauses 2.9 - 2.11) is checked with gauges in accordance with GOST 2016-86. Flanges for cylinders (clause 2.12) are tested in accordance with the requirements of GOST 9399-81.
4.7. The quality of the outer and inner surfaces of the cylinders (clauses 2.5; 2.6) is checked by external inspection.
4.8. Checking the volume of cylinders (clause 1.2) is carried out by filling the cylinders with water to the base of the neck and then determining the volume or mass of water.
4.9. If the results of testing samples for tensile or impact strength do not comply with the requirements of this standard, repeated tests of a double number of samples must be carried out according to the type of test that showed underestimated results.
If the results of repeated tests are unsatisfactory, the cylinders must be subjected to repeated heat treatment, after which the mechanical properties are tested in the order indicated above. No more than two repeated heat treatments are allowed. Additional tempering is not considered repeated heat treatment.
5 Labeling, packaging, transportation and storage
5.1. The following data must be clearly stamped on the spherical part at the neck of each cylinder:
manufacturer's trademark;
serial number of the cylinder according to the manufacturer’s numbering system;
date (month, year) of manufacture and testing;
type of heat treatment: N - normalization for carbon steel cylinders; W - hardening and tempering for cylinders made of alloy steel; working pressure (P) and test hydraulic pressure (P) in MPa (kgf/cm2);
nominal cylinder volume in l.
Note. At the consumer's request, instead of the nominal volume, the cylinders must indicate its actual value with an accuracy of 1 liter.
actual mass of the cylinder in kg with an accuracy of 1 kg;
OTK stamp;
5.2. The inner surface of the cylinders must be protected from corrosion by filling with a volatile inhibitor.
(Changed edition, Amendment No. 1).
5.3. The external thread of the neck of the cylinders must be protected from damage by metal or polyethylene rings. The openings of the necks of cylinders with internal threads must be tightly closed with metal threaded plugs, plugs with rubber gaskets or polyethylene threaded plugs. The openings of the necks of cylinders with external threads are tightly closed with a polyethylene plug.
5.4. Each batch of cylinders must be accompanied by a document certifying the cylinders’ compliance with the requirements of this standard, which must indicate:
name of the manufacturer and its address;
number of cylinders and their numbers;
results of hydraulic and pneumatic tests;
designation of this standard.
5.5. Cylinders are transported by all types of transport in accordance with the rules for the carriage of goods in force for this type of transport.
Transportation of cylinders by rail in wagon shipments is carried out with maximum use of the carrying capacity or capacity of the vehicle.
Transportation of cylinders - according to group Zh1 GOST 15150-69.
(Changed edition, Amendment No. 1).
5.5a. Transport marking with the application of main, additional and informational inscriptions - in accordance with GOST 14192-77.
(Introduced additionally, Amendment No. 1).
5.6. Storage of cylinders - according to group Z1 GOST 15150-69.
6. Manufacturer's warranty
6.1. The manufacturer must ensure that the cylinders comply with the requirements of this standard, subject to the operating, transportation and storage conditions established by this standard and the “Rules for the design and safe operation of pressure vessels” approved by the USSR State Mining and Technical Supervision.
6.2, Warranty period - 2.5 years from the date of putting the cylinders into operation.
(Changed edition, Amendment No. 1).
_____________________________
* The amendment is valid on the territory of the Russian Federation.