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P&T Rating by ASME Application question

P&T Rating by ASME Application question

P&T Rating by ASME Application question

(OP)
Hi,
I have three ASME Section I Safety Valves, rated for saturated steam service, with an ASME  "V" stamping.
- 1st. valve is set 1,128 psi (drum) size 3"-600#RF X 6"-150#RF
- 2nd. Valve is ser 1,163 psi (drum) size 4"-600#RF X 6"-150#RF
- And 3rd. valve is set 934 psi (outlet of super heater) size 3"-900#RF X 6"-150#RF

The rated boiler is 250,000 Kg/h @ 1,040 psig @ temperature saturated steam on the Drum and the outlet of super heater is 880 psig @ 905°F approx.

My doubt is, the P&T rating by ASME select for these valves is the correct? Because this inlet flanged is of 600#RF and not of 900#RF for the 1st and 2nd valves. The base material flanged is WC6 and temperature class B & D how it are indicated.
All valves are Dresser with the follow models;
1st. 3-2745B-1-X-1WSC
2nd. 4-2765B-1X-1WSC
3rd.  3-2746D-1-X-1WSC

I wait for their soon answer
Thanks
 

RE: P&T Rating by ASME Application question

LTrujillo-

A 1 ¼ Cr-1/2 Mo A217 Grade WC6 material  CL-600 flange at 600°F is good to 1210 psig and 900 psig at 900°F according to the 2003 edition of B16.5. Seems that the flange ratings are appropriate.

Next time consider posting this to forum794: Boiler and Pressure Vessel engineering (more mechanical type issues such as this flange rating question) or forum1203: Safety Relief Valve engineering (PSV) (more flow / process type issues) to reach a more targeted audience.

jt
 

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