CATALOGUE

Steel Cylinders of Medium Volume

Steel Cylinders for Gases of Medium Volume with concave bottom and with rotund bottom and supporting ring

GOST 949-73 & TU 14-3R-10-94

Cylinders Intended for storage and transporting of compressed, liquefied and dissolved gases by temperature from minus 50°C to +60°C.: Nitrogen Ammonia Argon crude Argon technical Argon pure Acetylene Butylene Petrogas Butane Hydrogen Air Helium Oxygen Oxygen medical
Cylinder for oxygen with valve VK-94

Volume: 20; 25; 32; 40; 50; liter
Working Pressure: 14 ,7 ; 19,6 MPa
Length of body: 740 - 1755 mm
Mass: 32,3 - 93 kg

The Drawing and appearance of a cylinder:

1. The Basic boot
2. The Case of a cylinder
3. The Ring of neck
4. The Valve
5. The Protective cap

Cylinders are equipped with valve, ring of neck and protective cap, supporting ring (for cylinders with rotund bottom).
Conical thread W 27.8 x 1/14 (taper 3 : 25) according to GOST 9909-81.
Mass of cylinders is specified without valves, caps, rings.

Parameters
Volume , liter	Diameter of cylindrical part, mm	Working Pressure , MPa
		14,7	19,6	14,7	19,6	14,7	19,6
		Min . WT, mm		Length of body , mm		Mass , kg
with rotund bottom and supporting ring (according to GOST 949-73)
20	219	6,8	8,9	740	770	32,3	42,0
25				900	935	38,7	50,5
32				1120	1165	47,7	62,5
40				1370	1430	58,5	76,5
50				1685	1755	71,3	93,0
with concave bottom (according to TU 14-3R-10-94)
20	219	6,8		720		33,3
25				880		39,7
32				1100		48,7
40				1340		60,2
50				1665		72,6

The technology of production of seamless cylinders.

Cylinders are produced from seamless pipes that have undergone ultrasonic control.

Technological process consist of the following stages: cutting pipes into billets, heating of billets ends and swaging (forging for cylinders of big volume) of bottoms and necks; heat treatment; mechanical work (threading under valve); chemical or shot-jet cleaning of the surface; painting according to the type of gas.

Control following each operation ensures product quality and conformance to standards requirements. Cylinders are subjected to hydraulic pressure tests for strength, and to pneumatic tests for air tightness.

Mechanical properties
Steel Grade	Tensile trength, N/mm2	Yield Strength, N/mm2	Elongation, %	Impact Bend , J/cm2
Steel Grade	minimum
carbon steel	638	373	15	29,4 (+20°C)
alloyed steel	883	687	10	98,1 (+20°C)

Chemical composition – Content of elements, %
Steel Grade	C carbon	Si silicon	Mn manganese	Cr chrome	Ni nickel	S sulfur	P phosphorus
carbon steel	0,42-0,45	0,17-0,37	0,50-0,80	0,25	-	-	-
alloyed steel	0,28-0,34	0,90-1,20	0,80-1,10	0,80-1,10	0,30	0,005	0,025

Each cylinder marked with the following information:

1)       Trade mark of a manufacturer,
2)       Number of a cylinder,
3)       Date (month, year) manufacture
4)       Year of following examination
5)       Working and testing pressure in at., 1 at = 0,980665 bar.
6)       Volume (Liter) of a cylinder,
7)       Mass (Kilogram) of a cylinder,
8)       Sign of a quality inspection of a manufacturer

Photos of cylinders (open in a new window)