API Flange for pipe size less than 2"
API Flange for pipe size less than 2"
(OP)
Can you help me please? I am very confused about API flange.
Now I have piping specification for API 5000 class from two big companys in offshore field.
Both said that flange 3/4"-2" will be class 5000 RTJ as per API 6A Type 6B and gasket will be API 6A Type "RX"
However, when I checked API standard, There are no flange size less than 2.1/16" shown in API 5000. I can find only 1.13/16" (1.5") flange on API 10000, 15000, 20000 and also gasket will be type "BX" only.
So, I am thinking that both piping spec. for two company may be not cleared. If I order flange 1.5" API 5000, vendor may supply flange 1.13/16" API 10000 and gasket type "BX".
However, when I checked ASME B16.20 (1997), it shows flange 1" and 1.5" API5000 which use gasket R20 or RX20.
So, it make me more confused.
Anyone can tell me what I can believe about API flange.
Thanks you very much
Now I have piping specification for API 5000 class from two big companys in offshore field.
Both said that flange 3/4"-2" will be class 5000 RTJ as per API 6A Type 6B and gasket will be API 6A Type "RX"
However, when I checked API standard, There are no flange size less than 2.1/16" shown in API 5000. I can find only 1.13/16" (1.5") flange on API 10000, 15000, 20000 and also gasket will be type "BX" only.
So, I am thinking that both piping spec. for two company may be not cleared. If I order flange 1.5" API 5000, vendor may supply flange 1.13/16" API 10000 and gasket type "BX".
However, when I checked ASME B16.20 (1997), it shows flange 1" and 1.5" API5000 which use gasket R20 or RX20.
So, it make me more confused.
Anyone can tell me what I can believe about API flange.
Thanks you very much





RE: API Flange for pipe size less than 2"
RE: API Flange for pipe size less than 2"
Take this post opportunity I'd like to ask. In my country there's a oil company that rules everything by itself, no matter what other codes like ASME, A|PI, ASTM, etc, states. My question is:
For a flowing pipe's fanges, what really counts to determinate if it'll be rtj or rf or something else, the flow passing thru or the pressure class?
Luiz
RE: API Flange for pipe size less than 2"
In steam service, it is common to see RTJ, even at low and lower pressure classes. I guess because it seals better?
I would say that the use of RTJ is more due to pressure than flow rate, at least in my industry.
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