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Wilco’s spherical high pressure storage vessels can be used to store non-corrosive gases, such as nitrogen.

The vessel can store and supply nitro-gen gas at up to 4,500-psi (31.0 MPa) design pressure, and maximum allowable operating pressure of 5,500-psi (37.9 MPa).

The spherical vessels can also be used to store other non-corrosive or low corrosive gases.

The vessel assembly is custom design-ed for the end users, and is designed using specifications and requirements from ASME Section VIII, Division 2, for National Board of Boiler and Pressure Vessel Inspectors registration.

Height, sphere and support skirt only: 68.9-inch (5.7-ft), (1.750-m)
Height, total (with relief valve and lock-out valve): 87.7-inch (7.3-ft), (2.228-m)
Outside diameter, vessel sphere:
54.5-inch (1.382-m)

Vessel assembly, empty:
8,060-lb. (3,660-kg)
Total weight of vessel assembly loaded with nitrogen at 5,500-psi, 70° F:
8,570-lb. (37.9-MPa, 21.1° C: 3,890-kg)

The pressure vessel has 3/4 and 1-inch FNPT nozzle threaded ports which can be optionally used as fill-discharge ports. The pressure relief valve is available with either ¾ or 1-inch NPT connection. The clean-out drain manifold at bottom has a high pressure needle valve with ½-inch NPT thread.

High pressure lock-out valve out with “Block and Bleed”
A high pressure “lock out” valve is used to close off the vessel’s relief nozzle during scheduled maintenance operations. This valve’s use in design and practice are prescribed in ASME Section VIII, Division 2. The standard unit is also supplied with block and bleed system for releasing pressure trapped between the lock-out valve and relief valve during maintenance.

The vessel has a conventional skirt type support structure.

• Storage Capacities: 70° F (21.1° C):

• Maximum Allowable Working Pressure: 5,500-psi, at 120° F (37.9- MPa, 48.9° C)
• Minimum Design Metal Temperature of 0° F at 5,500 psi (-17.8° C, 37.9-MPa)
• Analysis of cyclic pressure loadings between 4,500 and 3,500-psi yields a vessel
life of 260 years.
• Support structure design incorporates strength requirements for maximum
wind and seismic load resistance.