... the different shapes: elliptic shape, dishing shape, conical shape, flat roof shape, spherical arched shape and boiler profiled shape. At the same time, ... Gas Cylinders. With the design,productivity under B1, B3 pressure vessel level. It can produce CNG vehicle / station seamless ... , accumulator and so on.we can manufacture all pressure vessel as clients' requirement.B.regards,AnnabelTel.:0086-412- ...