Repairing damged hot-deep galvanized pipe
Repairing damged hot-deep galvanized pipe
(OP)
Hello!!
I'm working as a piping enginner.
For FW aboveground, galvanized pipes are installed. our procedure to install as follows
1. Cutting and welding pipes to fabricate the spools as per ISOs
2. Make them hot-dip galvanized
3. Install them in the field
When the change of the line is inevitable, we should do the same process once again.
It's wasting time because the entire spool should be re-galvanized.
Is there any way to repair the changed welding joint only in galvanizing such as painting??
I'm working as a piping enginner.
For FW aboveground, galvanized pipes are installed. our procedure to install as follows
1. Cutting and welding pipes to fabricate the spools as per ISOs
2. Make them hot-dip galvanized
3. Install them in the field
When the change of the line is inevitable, we should do the same process once again.
It's wasting time because the entire spool should be re-galvanized.
Is there any way to repair the changed welding joint only in galvanizing such as painting??





RE: Repairing damged hot-deep galvanized pipe
Or you could make friends with a galvanizer. Some processing outfits offer "expedited service" for extra money. Does your preferred galvanizer offer that? Can you justify spending extra money to save time? Is there anything you can do to speed the process, e.g. blast cleaning the modified/recycled modified spools or doing some other prep to make the galvanizer's life easier?
So-called "cold galvanizing compound", which looks and smells and applies like paint, has been available for decades. The people who sell it swear that it's magical. My limited experience says it's not even particularly good paint, much less a substitute for hot dip galvanizing.
Suppose you go ahead and paint the last few welded joints instead of dipping them. If they fail in, say, five years instead of 25 years, does that cost more than does the time lost waiting to get the spools dipped? I.e., maybe you can turn the issue into a business decision.
Mike Halloran
Pembroke Pines, FL, USA
RE: Repairing damged hot-deep galvanized pipe
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Repairing damged hot-deep galvanized pipe
Consider use of Dresser couplings:
http://www.plumbingsupply.com/galvanized-compressi...
RE: Repairing damged hot-deep galvanized pipe
However, thermal spray zinc (metallizing) is an excellent repair method.
RE: Repairing damged hot-deep galvanized pipe
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.