Connecting AWWA Class D flange to ASME 150# flange?

[frizzmizz]

Hello folks,
I was wondering if someone can help me with this issue.
I work for an oil and gas EPC and we are currently designing a fire water system to protect one of the hydrocarbon tanks on site.

All the piping is as per ASME B31.3 which is what the client pipe classes are based off. However, we need to put a 4" fire water strainer in the line. Unfortunately, the strainer we want (UL/ULC/FM approved) only comes with AWWA CLass D Flanges and I am not very familiar with these flanges.

I am trying to evaluate if it is going to be acceptable to put in a 4" 150# RF ASME flange to connect with the AWWA Class D flange. The drilling template for both flanges seems to match. The strainer flange is FF but is made from carbon steel so I don't think there should be any issues connecting RF to FF. However, I was wondering if there is someone more experienced with these flanges that can tell me of any issues that I have not thought of!

Appreciate any input! Thanks

-FM

 

[LittleInch]

Can you post the diemsnions of the AWWA flange.

At that size you might just get away with it if the holes actually match up, but normally no, you need a connecting piece.

There have been a couple of similar posts in the last few weeks - scroll down this forum and have a look.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[frizzmizz]

I looked online and found some details on the 4" AWWA Class D flange:

Nominal Pipe Size - 4"

Outside Diameter (A) - 9

Thickness (T) - .625

Inside Diameter (B) - 4.57

Approximate Weight (lbs) - 8

Number of Bolt Holes - 8

Diameter of Bolt Holes - 0.75

Diameter of Bolt Circle (C) - 7.5

http://www.lyncoflange.com/customer/lyflfi/pdf/c207-07-cld-so.pdf

http://catalog.coastalflange.com/viewitems/awwa-flanges/table-2-awwa-c207-07-class-d-ring-flanges

I read some of the other threads but they were mostly related with connecting FF to RF flanges.

 

[rconner]

I am aware at least per AWWA C207 (for water service" says re 4" Class B&D flanges, "Maximum pressure (test or transient) allowed up to 129 psi for Class B, 262.5 psi for Class D up through 12". [If you have not done so, you may want to check e.g. what is the FM listed pressure rating of the strainers -- and is that suitable for your project conditions?]

 

[frizzmizz]

Hi rconner thanks for your input. Since we don't normally deal with AWWA C207 we don't have a copy of that standard. But it is good to know that those flanges are designed to withstand a hydro of up to 262.5 psig.

Design pressure of our lines is 150 psig.
Strainer max operating pressure is 175 psig as per catalogue.
We plan to hydro the entire line including strainer to 225 psig. I checked with vendor and strainer can withstand this pressure for a one time hydro test.

 

[JStephen]

They should bolt up and work fine, dunno about rated pressures, though.
Check bolt length, the AWWA flanges are thinner than 150#.