914mm CNG Gas Cylinder Pressure Vessel for Compressed Natural Gas
Storage
Certificates:ASME U, ASME U2
Applicable standard:ASME VIII, ISO 11120-1999, dot sp8009, Q321088HGF 005-2012
Designed pressure:20MPa, 25MPa
Material:ASTM A519 4130Q, ASME SA372 grade J, Classes 110
Manufacture processing: Three-dimensional cold rolling + Hot spinning
Stationary Ground Storage & Movable
Shapes: Cylindrical & Spherical
Advantages:
Larger volume of 25m³
Units with lower transport costs
Ratio of water volume/ weight basically more than 1, the biggest
can up to 1.43.
Ф 914mm with fewer numbers of cylinders compared with Ф559mm
Small sealed interfaces and higher safety factor
Applicable gas: CNG, hydrogen
Applicable field: Natural Gas Fueling Station, Gas Storage Station, Marine storage
cylinders, High pressure natural gas, hydrogen transport, etc.
Cylinder Parameters:
| Parameters | Working Pressure=25MPa |
| Material | 4130Q |
| Diameter(D) | 914mm |
| Safety Wall Thickness | 22.5mm |
| Stress factor F | 0.8323 |
| Yield strength | 820MPa |
| Tensile strength | 1050MPa |
| Hydraulic test pressure(Ph) | 37.5MPa |
∅914 Gas cylinder advantages (Comparing with ∅559 gas cylinder under Working pressure 25MPa):
| Parameter | L: 6 meters | L: 8 meters | L: 11.7 meters |
| Working Pressure 25MPa | ∅914×4 pieces | ∅559×8 pieces | ∅914×4 pieces | ∅559×8 pieces | ∅914×4 pieces | ∅559×8 pieces |
| Wall Thickness | 22.5mm | 17.3mm | 22.5mm | 17.3mm | 22.5mm | 17.3mm |
| Water Volume(L) | 13500L | 10602L | 18000L | 14055L | 27000L | 18000L |
| Weight | 11840kg | 11093kg | 13348kg | 14790kg | 23361kg | 21631kg |
| Ration(L/kgs) | 1.14 | 0.956 | 1.35 | 0.95 | 1.16 | 0.83 |
Manufacturing Process:
Raw Material Inspection → Cold Centering → Heating → Piercing &
Rolling → Cold rolling →
Heat Treatment → Testing → Straightening → NDE → Visual & Dimension
Inspection →
Hot Spinning → Heat Treatment → Lab Testing → Hydro & NDE Testing →
Storing & Shipping
Technology Advantage:
The World’s Largest Cold Rolling Mill with φ960mm: Three
Dimensional cold rolling, with high dimensional accuracy,
mechanical properties of isotropic uniform, high finished product
rate and low cost.
Conclusion:
φ914mm cylinder with large water volume, single trailer with 4
pieces cylinders can reach 25m³up. φ914mm cylinder’s units with
lower transport costs, ratio of water volume/ weight basically more
than 1, the biggest can up to 1.43. φ914mm with fewer numbers of
cylinders compared with φ559mm, small sealed interfaces and higher
safety factor.
As per ASME Sec. VIII cylinder design, φ914mm cylinder with high
safety coefficient, high storage efficiency, can be widely used in
natural gas station, Diesel train CNG transformation, marine
storage bottles group and other chemical gases such as hydrogen
storage.
