316SS or Hastelloy C A494 for Operation T up to 500F
316SS or Hastelloy C A494 for Operation T up to 500F
(OP)
Need to install a Pressure/Vacuum Relief valve on a vessel. Normal operating temperature is as high as 500F. Wondering what material is good for the Pressure/Vacuum Relief Valve? 316 Stainless Steel or Hastelloy C A494? Or select other materials? Thank you for your suggestions.





RE: 316SS or Hastelloy C A494 for Operation T up to 500F
RE: 316SS or Hastelloy C A494 for Operation T up to 500F
RE: 316SS or Hastelloy C A494 for Operation T up to 500F
RE: 316SS or Hastelloy C A494 for Operation T up to 500F
RE: 316SS or Hastelloy C A494 for Operation T up to 500F
See 2.2 for A 182 Grade F316. Looking at table F2-2.2 for deg F find that 500 degree F a Class 300 type 316 SSt flange is good to 480 psig and the pressure drops to a maximum of 1500 degree F.
In this example Class 300 flanges are rated for higher pressure in Hastelloy C-276 than for type 316 stainless steel.
See 2-3.X for some of the nickel alloys such as B 564. Hastelloy includes ASTM B 366, B 564, B 572, B 581, etc. Looking at F2-3.2 at 500 degree F find that B 160 grade N02200 Class 300 is limited to 455 and only published to 600 degree F. N02201 Class 300 is only rated 255 psig at 500 degree F. Table 3.3 is published to 1200 F. Table F2-3.6 for N08800 Class 300 500 degree F is rated 600 psig and published to 1500.
RE: 316SS or Hastelloy C A494 for Operation T up to 500F
carol2005
For your case with a temperature of 260ºC and in nitrogen service I think 316 Stainless Steel would be enough.