BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
(OP)
I have a coded fired steam boiler that I am building and my firebox flange should not technically retain any pressure but I have to consider it pressure retaining anyway. The original BOM has my material at SA-36 (.75" thick) receiving only 150F temp operating and 75lbs of pressure design. The code book is somewhat longwinded. I want to use SA-36 on what will be considered a pressure retaining flange- is this kosher by ASME or should I just go with SA-516-70? I know the SA-516-70 is a sure shot to comply to code, but I am also looking at cost. This will be on several vessels so its not a one time expense. Any feedback is appreciated.





RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
It would be worthwhile to read it anyway.
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
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RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
Are you sure that this hot water heating boiler with design temp of 150F at 75 psig is not under ASME Section IV, which does permit the use of SA-36? Do you even have an ASME Certificate of Authorization for manufacturing these boilers? If in the USA, you must manufacture/sell boilers to the Local (generally State) Jurisdiction requirements.
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
I do have an ASME Certificate of Authorization. We have never used Section IV, we have always used Section VIII, our AI goes by the Sec.VIII guidelines. I am new to the Quality Control aspect of this job. Is there a provision of Section IV that I should be looking at? The only Code books I have are Sec VIII and it seems to cover what I am building.
Thanks
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
Your Company would need an H Certificate to manufacture heating boilers under ASME Section IV. HG-540.7 of ASME IV defines provisions for when a Manufacturer may start fabricating Section IV items before reciept of the H Certificate. If your Company wishes to be in the business of manufacturing water heating boilers, I advise that they apply to the ASME for the H Certificate.
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
Does it matter what type of fired process that the treater will be used for? It is a fired treater to treat oil, not just water. My inspector is coming over later today to look at a different type of vessel and I will get with him, but if you have some insight into this, the inspectors usually try to get in and get out with not much context.
So I guess my question is: Does any fired pressure vessel fall under that section if water is involved?
Thanks
Myles
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
Your oil heater can meet U-1 (a)(2) and be stamped accordingly.
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
Your exterior firetube flanges are not pressure retaining, nor are they regulated by ASME code. One of the flanges has to be designed mechanically to withstand the loads from your flame arrestor (or firebox, whatever you are calling it),and the other flange needs to be designed to withstand the loads from your stack. Neither has to be designed for pressure. The SA-36 is acceptable material. The firetube proper needs to be designed for external pressure equal to the treater design pressure, be able to externally withstand the hydrotest pressure, and be made from Section II materials (516-70N or 106B for example). You also do not need to apply the rules of B16.5 for this configuration. If you want a guideline for design, use Appendix 2 with a relatively low pressure (50 psig??). I would not consider this to be a 'fired' vessel as the flame is indirect, nor would I consider it a boiler of any kind. All you are doing is indirectly heating the oil/water medium to accelerate separation.
Or, at least that is what I was able to pick out of your post. I could be wrong.
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
My biggest obstacle is that I have been working in the chemical industry for years and I am just recently a QCM at a pressure vessel company. While I am a mechanical engineer, ASME code is just difficult to get right everytime in every situation when I have NEVER encountered any of these particular situations prior. I dealt with thermal flow in a chemical process, not weld sizes on SA-105 pipe. So this is a big learning experience for me.
Any advice that can be given would be greatly appreciated..
Thanks
Myles
RE: BPV Sec8 Div 1 vessel SA-36 or SA-516-70?
Follow the advice of your Inspector. If they belive this flange is outside of the boundary for Section VIII, Div 1 or Section I design rules, the flange and MOC should be based on prudent design, and proper selection, respectively. Based on the information from your Inspector, SA 36 material could be used.