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Pipe Jointing Through Socket - Pipe Welding of GI (Galvanized Iron) Pipe

08/07/2017 10:32 AM

Instead of thread joints , whether pipe jointing through socket can be adopted. What precaution to be taken to weld GI socket to GI pipe for pipe from 100 NB to 250 NB. Whether to have deep root penetration for strong joint in fillet weld (socket to pipe) will burn the Zinc coating inside. How to take care of it. OR just it is not to be done to weld GI socket to GI pipe at site as it would burn zinc coating especially for Drinking water purpose. Please advice.

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#1

Re: Pipe Jointing through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 10:36 AM

Use a system approved locally for potable water use instead:

  • Copper, either soldered with non-lead solders or brass or bronze compression fittings, or
  • Plastics, which can be welded using various techniques, or
  • Malleable iron, socket or bolted, or
  • Cement-coated pipe, which is joined using couplers.

Nobody in their right mind welds [galvanised anything]: the operation is hazardous to the operative, and compromises the galvanising layer in a way never intended by the specifier of the coating in the first place. Just don't do it.

Further, this is a duplicate thread as this topic has been raised before. See CR4 Rule 6.

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#2
In reply to #1

Re: Pipe Jointing through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 11:05 AM

Thanks.

But we are already having GI pipes at site and can't change or return back . Does welding of socket to pipe to pipe jointing externally is Okay. What should be the max. root depth of fillet weld socket to pipe , which can be tried not to burn zinc coating inside without compromising the joint strength too. Or is it not at all advisable welding even externally.

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#3
In reply to #2

Re: Pipe Jointing through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 11:10 AM
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#5
In reply to #2

Re: Pipe Jointing through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 11:16 AM

"But we are already having GI pipes at site and can't change or return back."

Well, okay... is there something to preclude the use of a pipe cutter, a threading machine, and appropriate threaded galvanized iron fittings?

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#6
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Re: Pipe Jointing through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 12:01 PM

No,

But whether the pipe can be threaded at Project site of diameter of 100NB and upto 250NB and what is the best means of making threaded end . Lathe or any other option available.

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#14
In reply to #6

Re: Pipe Jointing through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/08/2017 3:00 AM

It appears that the organisation putting in the pipes has neither the standard nor the nounce to do it properly. How it sold the idea that it could put pipes together for potable water is a mystery here.

It would be best for the Client to take its business elsewhere.

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#15
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Re: Pipe Jointing through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/08/2017 3:27 AM

Thin-walled stainless steel pipe, either flanged, welded or coupled, is another solution, one widely used in the water supply and wastewater recovery sector.

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#4

Re: Pipe Jointing Through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 11:16 AM

Welding galvanized water supply pipe is not recommended ...either use threaded fittings or make the joint before galvanizing....

http://opus.mcerf.org/pair.aspx?appID=-2032671433187108981&materialID=-489493901775278602

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#7

Re: Pipe Jointing Through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 12:12 PM

How about using a grooving machine and Victaulic®-style couplings? (Usual disclaimer.)

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#8
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Re: Pipe Jointing Through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 12:25 PM

Thanks Sir !

Sorry to bother you , If possible , Could you give more detail on victaulic coupling for GI pipes ranging 100NB to 250NB.

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#9
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Re: Pipe Jointing Through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 12:31 PM

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#10
In reply to #8

Re: Pipe Jointing Through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 1:11 PM

I don't have a catalog, but a Web search on "Victaulic" should gain you some information. Companies that do fire sprinkler systems would also be a good source (e.g., Viking, Grinnell).

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#11
In reply to #7

Re: Pipe Jointing Through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 1:43 PM

That's a very good idea. GA

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#12
In reply to #7

Re: Pipe Jointing Through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 4:20 PM
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#13

Re: Pipe Jointing Through Socket-Pipe Welding of GI (Galvanized Iron) pipe

08/07/2017 9:41 PM

PWSlack is right.

If you weld galvanized, depending on your air supply, and how well you prepped the joint,you run the risk of experiencing metal fume fever. MFF doesn't look like a good time.

Welding on galvanized without compketely removing galvanization yields problems in the weld.

Even if you handle the fumes and the cleanliness requirements, you will need to regalvanize or find a suitable alternate means to provide the missing protection.

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#16

Re: Pipe Jointing Through Socket - Pipe Welding of GI (Galvanized Iron) Pipe

08/08/2017 11:37 AM

Don't, Just Don't.

At least see if you can barter the material on hand for something that will work.

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#17
In reply to #16

Re: Pipe Jointing Through Socket - Pipe Welding of GI (Galvanized Iron) Pipe

08/09/2017 4:14 AM

Next time the original poster needs to check standards before quoting for the work!

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