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ASME Seamless Pressure Vessels for Stationary Storage of Gases
Seamless Steel Pressure Vessels for the stationary storage of
compressed gases are constructed to meet the requirements of The ASME
Boiler and Pressure Vessel Code, Section VIII, Division 1 and Division 2.
In accordance with The ASME Boiler and Pressure Vessel Code, Section VIII,
Division 1, seamless integrally forged vessels are permitted to be
constructed with a proportionally higher wall stress allowance. The vessel
materials conform to Specification SA-372, Section II of the ASME Code.
Allowable wall stress values are equal to one-third or one-fourth of the
specified minimum tensile strength. In the U.S., most state and municipal
laws require ASME compliance for ground storage of compressed gases.
Certification
CPI Seamless Steel Pressure Vessels manufactured and certified to the ASME
Code are inspected by a qualified ASME inspector licensed by the National
Board of Boiler and Pressure Vessel Inspectors (National Board) and
stamped with the ASME Code symbol. In addition, they are registered with
the "National Board" in compliance with the rules of the
National Board of Boiler and Pressure Vessel Inspectors, which provides
for the interchange and acceptance of ASME vessels between states if
relocation is desired.
Typical Applications
CPI Seamless Pressure Vessels are used in single or multi-vessel
assemblies for the containment of gases under pressure including hydrogen,
nitrogen, air, helium and oxygen. Pressures range from 1500 psi to 10,000
psi. These vessels are used for diverse storage system applications in the
fields of public utilities, chemical refining and processing, oil and gas
exploration and production, mining, ocean engineering and medicine.
Applications include nitrogen gas purging and blanketing of high pressure
boilers during cleaning or repair; hydrogen cooling of power plant
generators; helium cooling of nuclear reactors; storage of compressed
natural gas for alternate fuel systems; and shipbuilding applications.
Note: During installation and prior to pressurization of any ASME
pressure vessel(s), a pressure relief device(s) which complies with all
requirements of paragraphs UG-125 through UG-136 of the ASME Boiler &
Pressure Vessel Code, Section VIII, Div. 1 must be installed on the
pressure vessel(s) or in the connecting piping.
CPI seamless pressure vessels are constructed in accordance with the
ASME code for unfired pressure vessels, Section VIII, Division 1 or 2 and
Appendix 22.
The Sizes,
Capacities and Design Pressures table lists the standard size vessels
normally available from stock material. The maximum overall lengths are
shown for each vessel design and are based on the largest pipe lengths and
or pipe weights available. Shorter vessels may be provided however it is
suggested that these lengths should be chosen as some multiple of the
lengths listed to achieve maximum material yield from each length of pipe.
Special design pressures and sizes are available if the total weight is
sufficient for CPI to order a special pipe rolling from our pipe
suppliers.
Included with the size and dimensional data are the maximum allowable
design pressures for each material grade listed. These pressures are based
on an allowable wall stress of one-third (SF =3:1) or one-fourth (SF=4:1)
of the vessel material tensile strength which, along with other mechanical
properties, can be found in the Mechanical
Properties of Typical Seamless Vessels Steels table. Maximum allowable
design pressure ratings are included for SF=4:1 and SF=3:1 pressure
vessels with and without "standard" 1/16" (1.6mm) internal
corrosion allowance.
For other than "standard" corrosion allowance or external
loadings such as wind and seismic events, the buyer must provide
additional design requirements in accordance with the requirements of
paragraphs UG-22 and UG-25 of Section VIII, Div. 1 of the ASME code.
It is recommended that the maximum service pressure be limited to 90% of
the design pressures shown since a spring loaded, reclosing, safety relief
valve is required to protect each vessel or group of vessels and must be
set to open at a pressure equal to the maximum stamped design pressure.
This practice will eliminate nuisance relieving of the safety relief
valve(s) which are designed to be "bubble tight" up to 95% of
their respective set pressure.
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