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Reading: Why Orifice Flow Meter Flange is Not Recommended 150# Rating?
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Inst Tools > Blog > Flow Measurement > Why Orifice Flow Meter Flange is Not Recommended 150# Rating?

Why Orifice Flow Meter Flange is Not Recommended 150# Rating?

The Restriction Orifice can have a 150# flange rating but the Orifice Flow Meter Flange is not recommended to have a 150# flange.

Last updated: November 2, 2023 11:37 am
Editorial Staff
Flow Measurement Instrumentation Design
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This question comes to mind? As to Restriction Orifice can have 150# but the Orifice flange (Flow meter) is not recommended to have a 150# rating.

Contents
Orifice Flange Rating – 150#The PROOF
Orifice Flange Rating

Orifice Flange Rating – 150#

We have the answer in one sentence.

It is due to flange integrity !

It means in simple words :- Orifice that are flange tapped have reduced strength

Due to this drilling in between them their pressure-temperature retaining capacity reduces

So to ensure flanges have Strength to withstand Design pressure and temperature a higher rating than 150# i.e 300# is used .

Now There has to be some proof supporting It !!!

The PROOF

The standard we use for Normal flanges below 24” is ASME B16.5

But for Orifice, the flange standard is ASME B16.36

This standard starts with 300# Flange rating.

In restriction Orifice as there are no tapping hence we go with ASME B16.5 flanges which Start with 150# Rating .

As always ! Thanks a lot for Reading !!

PS :- It is observed that for very large line sizes ( Depends few say above 10”, few say above 20”) 150# can be used as these flanges are stronger at higher line sizes but I have not found concrete proof in standards yet.

I would be very grateful if somebody knows the standard that has this documented.

Author: Asad Shaikh

Profile: Linkedin

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1 Comment
  • Albert Hattingh says:
    December 16, 2023 at 3:12 pm

    which would be the best instrument to measure flow in a 4″ gas line? unfortunately the gas contains condensate.

    Reply

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