High Temp Pressure Vessel Question - Incoloy 800HT
High Temp Pressure Vessel Question - Incoloy 800HT
(OP)
Hello,
My customer is looking for a pressure vessel that can handle 950C and 50psi in a 50% 02 environment. I've spec'd Incoloy 800HT but I can't find any S values at these conditions. I am awaiting my BPVC-VIII code book in the mail, hopefully that will have it. But in the meantime I just want to do a sanity check.
In addition, I will need threaded rod that can withstand these same conditions....I'm hoping to find someone that can make 10-32 rod out of 800HT but I'm not sure.
Any information is appreciated - thank you!
Matt
My customer is looking for a pressure vessel that can handle 950C and 50psi in a 50% 02 environment. I've spec'd Incoloy 800HT but I can't find any S values at these conditions. I am awaiting my BPVC-VIII code book in the mail, hopefully that will have it. But in the meantime I just want to do a sanity check.
In addition, I will need threaded rod that can withstand these same conditions....I'm hoping to find someone that can make 10-32 rod out of 800HT but I'm not sure.
Any information is appreciated - thank you!
Matt





RE: High Temp Pressure Vessel Question - Incoloy 800HT
RE: High Temp Pressure Vessel Question - Incoloy 800HT
* UNS N06002 (Hastelloy X®, Nickelvac® HX, Nicrofer® 4722, Altemp® HX, Inconel® HX)
* UNS N08810 (Incoloy® Alloy 800H)
* UNS R30556 (HAYNES® 556® Alloy
RE: High Temp Pressure Vessel Question - Incoloy 800HT
If I specify the UNS N08811 alloy for Incoloy I can get to a higher temperature, right?
Thanks again.
Matt
RE: High Temp Pressure Vessel Question - Incoloy 800HT
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RE: High Temp Pressure Vessel Question - Incoloy 800HT
By the way, the stress values for Alloy 800H at 1700 deg F, the allowable stress is 0.71 Ksi, for 1750 deg F, 0.56 and for 1800 deg F , 0.44 Ksi.
Bolting as supplied under ASME SB 408 for Alloy 800H is still limited to 1650 deg F as mentioned above.
RE: High Temp Pressure Vessel Question - Incoloy 800HT
RE: High Temp Pressure Vessel Question - Incoloy 800HT
Yes. Actually, Section II contains various parts in addition to stress tables (Part D) - Parts A (ferrous material specifications), B (nonferrous material specifications), C (Specifications for Welding Rods, Electrodes and Filler Metals), and D.
RE: High Temp Pressure Vessel Question - Incoloy 800HT
RE: High Temp Pressure Vessel Question - Incoloy 800HT
.
14 Ksi @ 1000 deg F, 11.6 Ksi @ 1100, 7.4 Ksi @1200, 4.7 Ksi @1300, 1.1 Ksi @1600
Interpolate between values.
RE: High Temp Pressure Vessel Question - Incoloy 800HT
I finally rec'd Section II Part D and I have an issue. P. 246 lists the Incoloy Alloys N08811 and N08810 and MAXIMUM service temp is 1650 - metengr where are you getting the values up to 1800F?? I don't see anything in either of the addenda's.
Any help is greatly appreciated, thanks!
RE: High Temp Pressure Vessel Question - Incoloy 800HT
2009 addendum of Section II, Part D, Table 1B
look at page 243, line 39, for UNS N08810, maximum permitted temperature is 1800 deg F. Keep in mind this is for seamless pipe and tube.
On page 246 you are looking at forgings and welded pipe/tube, bar and plate. These products are limited to 1650 deg F.
You will have to decide if your vessel can be built out of pipe versus forgings, welded pipe or plate to take advantage of the higher permitted service temperature.
Otherwise, a Code Case could be one option for your application.