ASME B16.5 Flange with partiton plate for exchangers
ASME B16.5 Flange with partiton plate for exchangers
(OP)
Dear All,
I have been using ASME B16.5 flange for exchangers with or without partition plate.
Recently i have come across TEMA RCB-11.7, which provides guidance to modification of WM1 and WM2 which are bolt load for operating condition an d gasket seating.
I went through various posts which is already discussing this issue, but i still have some confusion.
It is very much clear that B16.5 flange is rated for certain pressure and temperature, and it can survive rated pressure and temperature. adding partition plate increases bolt load, for which i have checked available bolt area as per appendix-2 and it is higher than minimum requirement, hence it is proved that bolt can withstand additional bolt load.
my concern is flange and stresses on flange due to bolt load, i have tried to design B16.5 flange as appendix-2 flange but it fails even without partition plate.
Can anyone suggest how we can justify that B16.5 flange is good enough to go ahead with partition plate along with additional bolt load.
Regards,
Ste
I have been using ASME B16.5 flange for exchangers with or without partition plate.
Recently i have come across TEMA RCB-11.7, which provides guidance to modification of WM1 and WM2 which are bolt load for operating condition an d gasket seating.
I went through various posts which is already discussing this issue, but i still have some confusion.
It is very much clear that B16.5 flange is rated for certain pressure and temperature, and it can survive rated pressure and temperature. adding partition plate increases bolt load, for which i have checked available bolt area as per appendix-2 and it is higher than minimum requirement, hence it is proved that bolt can withstand additional bolt load.
my concern is flange and stresses on flange due to bolt load, i have tried to design B16.5 flange as appendix-2 flange but it fails even without partition plate.
Can anyone suggest how we can justify that B16.5 flange is good enough to go ahead with partition plate along with additional bolt load.
Regards,
Ste





RE: ASME B16.5 Flange with partiton plate for exchangers
Your B16.5 flange is presumably good for the full applied bolt load Ab*Sa (see the Note at the end of Apx 2-5). If your calculated values of Wm1, Wm2 & W do not exceed Ab*Sa, you are good to go.
What you are doing is not unusual, very common. Also it is well known that B16.5 flanges usually do not make on an Apx 2 calculation, they are comparatively over-bolted.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: ASME B16.5 Flange with partiton plate for exchangers
RE: ASME B16.5 Flange with partiton plate for exchangers
Sometimes common sense has to serve :)
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: ASME B16.5 Flange with partiton plate for exchangers
I didn't find any direct statement limiting bolt load, but what is your view on below statement.
B-1 GASKET MATERIALS AND CONSTRUCTION
Classification of gasket materials and types is shown
in Table B-1. Other gaskets that result in no increase in
bolt loads or flange moment over those resulting from
the gaskets included in the respective groups may be
used (see para. 5.4).
RE: ASME B16.5 Flange with partiton plate for exchangers
RE: ASME B16.5 Flange with partiton plate for exchangers
So, to take another tack, see (in my 03 edition, anyway) B1.2 "Bolt Cross-sectional Area" and note that gasket properties, dimensions, etc. are completely absent from the expression. Implying that bolt area is completely unrelated to the gasket.
We're not really getting anywhere...
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: ASME B16.5 Flange with partiton plate for exchangers
RE: ASME B16.5 Flange with partiton plate for exchangers
I have been working on this issue, and have come to a conclusion that if ASME B16.5 flanges are used a calculation as per Appendix-2 is required based on a code interpretation below,
Regards,
Stephen
RE: ASME B16.5 Flange with partiton plate for exchangers
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: ASME B16.5 Flange with partiton plate for exchangers
If i will attend next audit for our shop, i will surely discuss this with team leader for our region.
Regards,
Stephen