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stevo54 (Industrial) (OP)
11 Apr 08 19:12
What is the temp rating on a 2" 800# class A105 globe valve
@ 1975psi?
Helpful Member!  gr2vessels (Mechanical)
13 Apr 08 21:06
I assume that the quoted class 800# should be a missprint, either class 600# or 900#, in accordance with API 6D. Please find below an "extract" from the API6D, ed. April 2008, Clause 7.2:
"Pressure-temperature ratings for class-rated valves shall be in accordance with the applicable rating table for the appropriate material group in ASME B16.34.
Pressure-temperature ratings for PN-rated valves shall be in accordance with the applicable rating table for the appropriate material group in EN 1092-1.
If intermediate design pressures and temperatures are specified by the purchaser, the pressure-temperature rating shall be determined by linear interpolation.
Pressure-temperature ratings for valves made from materials not covered by ASME B16.34 and EN 1092-1 shall be determined from the material properties in accordance with the applicable design standard."

Since the 1975 psi is exceeding the class 600# alltogether, then the temperature rating for 1975 psi in class 900# would be some 235-236 F, group material 1.1, as per ASME B16.34.
Helpful Member!  JLSeagull (Electrical)
21 Apr 08 13:31
Class 800 exists in the ASME B16.34 notes:
(1) Class 800 is not a tabulated ASME B16.34 designation. It is an intermediate class that is widely used for socket welding and threaded end valves.
Helpful Member!  MJCronin (Mechanical)
22 Apr 08 15:44
Accoding to my old VELAN Valve info - 100F



Helpful Member!(2)  unclesyd (Materials)
22 Apr 08 22:58
According to the current Vogt catalogue the rating is 1975 psig @ 100F for a Class 800 Forged A 105 Globe Valve.

Here is there statement on pressure temperature ratings and a link to the current catalogue.

2.5 Pressure/Temperature Rating

Proper selection of the pressure/temperature rating of the valve shall meet service requirements. If the valve application involves temperatures above 100°F (38°C), then the valve pressure rating at the service temperature must be verified to meet the requirements of the application. If system testing will subject the valve to a pressure in excess of its working pressure rating, then the intended testing pressure and a statement explaining whether the
test pressure is through the opened valve or a differential across the closed valve, should be included in the purchase

Source Reference for Vogt valves pressure/temperature ratings ASME B16.34 Valves, Flanged, Threaded, and Welded End VVACT0000, Vogt Catalog.

Vogt catalogue page 112 for pressure temperature ratings.

gr2vessels (Mechanical)
23 Apr 08 2:58
sorry stevo, I was incorrect, but I learned to..
Thanks also for the guys to help...

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