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26
Operating Differentials
The variety of service conditions which a pressure relief valve is subjected
to precludes a rigid set of rules. Operating difficulties can be minimized by
providing as much differential as possible for known conditions on a
particular application. Table 10.5 lists the suggested minimum differentials.
Set Pressure Tolerance And Operating Differentials: Gases, Vapors, and Liquids
Set Pressure psig
Set Pressure Tolerance
(+) or (-)
Minimum Differential
Suggested
(Gases & Vapors)
Minimum Differential
Suggested (Liquids)
Metal Seat
Soft Seat
15 to 70
2 psi
5 psi
5 psi
Metal Seat
Soft Seat
71 to 1000
3%
10%
10%
Metal Seat
Soft Seat
1001 to 6000
3%
10%
10%
Final Notes
Once your valve has been assembled and tested make sure that you have
completed all necessary records before placing it back in service. These
records are important for the effective future use of the valve. They will
provide some guidance as to when to retire valves and replace components
as well as providing the historical record of the conditions and services
under which the valve operated. A sample maintenance record appears in
Appendix F which can be photocopied and used for this purpose.
The valve should be properly installed in service or prepared for storage. If
the valve is to be stored the inlet and outlet of the valve should be covered
to protect against any foreign matter entering the valve.
Table 10.5
Содержание 2600 Series
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