Galvanizing pipe post fabrication

[CGarfield]

Hello;
A client of ours has specified compressed air piping be galvanized post fabrication. The spec also calls for flanged connections. Any idea what we'll have to do to the flange after galvanizing? We are going to oversize the bolt holes slightly, and are thinking we'll have to machine the gasket face after galvanzing. We'd appreciate any comments or input. Thanks.
Brian

 

[unclesyd]

You need to post a few more details like size, type flanges, and materials.

Though not a common as it once was pipe spools were fabricated and then galvanized. You would mask off the flange face prior to galvanizing.

Is there any reason for taking this approach in lieu of using standard galvanized pipe and fittings.

 

[CGarfield]

2", CL150, carbon steel slip on flange. Pipe is sched 40. It is for compressed air, and the pipe will be burried. Total length of underground pipe is 120 feet. They've asked us to supply the spools in 40' lengths, flanged ends.

We're still trying to drag a few more details out of the client.

 

[11echo]

Direct burring flanged connections is a very poor practice! It's a leak waiting to happen! But as contractors you have to follow the "golden rule"! ...He who has all the gold makes the rules! ...Even bad ones!!! ...SO you going to used galv. bolts on these flanges connections? You could have galvanic corrosion if you don't. Good Luck!