CATEGORY D SERVICE 1

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Under Category D, is there a difference between "DESIGN GAGE PRESSURE" & "DESIGN PRESSURE"?

fluid service: a general term concerning the application
of a piping system, considering the combination of fluid
properties, operating conditions, and other factors that
establish the basis for design of the piping system. See
Appendix M.
(a) Category D Fluid Service: a fluid service in which
all of the following apply:
(1) the fluid handled is nonflammable, nontoxic,
and not damaging to human tissues as defined in
para. 300.2
(2) the design gage pressure does not exceed
1 035 kPa (150 psi)
(3) the design temperature is not greater than 186°C
(366°F)
(4) the fluid temperature caused by anything other
than atmospheric conditions is not less than −29°C
(−20°F)

 

[XL83NL]

If your design pressure is, say, 15 bar(g), i.e. 1500 kPa(g), then your design gage pressure would be 1500 kPa, or 15 bar.