Welding Applicable/Recommended For Sizes of Pipe

4 comments

Rate

Noudge79 Guru Join Date: Feb 2011 Posts: 1119 Good Answers: 11	Welding Applicable/Recommended For Sizes of Pipe 03/09/2011 9:56 PM
	Hello everyone! I'd like to know your advice regarding welding of pipes. Is there any code or standard stating that welding is best preferably applicable at pipe size 50mmΦ up. Pipe sizes lower than that threaded connection is mostly advised. What could be the explanation for such. Id really like to know. __________________ " To infinity and beyond" - Buzz Lightyear
	Register to Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

These comments received enough positive votes to make them "good answers".

Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#1 Re: Welding Applicable/Recommended For Sizes of Pipe 03/09/2011 10:06 PM
	Threads up to 50 mm (2 inches) are economical to cut in the field, either with manual or powered dies. Larger sizes are awkward, and harder to tighten up well. In carbon steel pressure piping, even smaller pipes are mostly welded, these days usually with socket-weld fittings. In earlier days, oxy-acetylene butt-weld fittings were the most common choice. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
	Register to Reply

Noudge79 Guru Join Date: Feb 2011 Posts: 1119 Good Answers: 11	#2 In reply to #1 Re: Welding Applicable/Recommended For Sizes of Pipe 03/09/2011 10:21 PM
	Thanks. I was working with fuel oil piping for Gensets, most of our pipes used were size 50mm dia., and our subcontractor was using threaded type of fittings. I kinda thought, why not go with the welded fitting set up, since our pipes are seamless, it would be very practical also to have the fittings just welded than that of the threaded type. Otherwise, we should have not bought seamless pipes in the first place. What you think about that? What could be the best preference?(threaded or welded connection) __________________ " To infinity and beyond" - Buzz Lightyear
	Register to Reply

Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#3 In reply to #2 Re: Welding Applicable/Recommended For Sizes of Pipe 03/09/2011 10:54 PM
	Fuel oil piping is not usually high pressure, and with proper joint compounds can be sealed successfully. However, welding would typically give better mechanical strength. Socket-weld fittings are a bit slower to make than threaded, but not by very much, so they are still fairly economical. Unless there are some code provisions or project specifications that were overlooked, I would tend to leave the piping as is, maybe watching more closely for any leaks. For future work, I agree that welding is preferable. In my location, double-containment piping is now used for fuels. This might not be required in your jurisdiction. The outer pipe is often some kind of plastic (I forget which). The joints are socket type with embedded wire heating coils that fusion-weld the joints--pretty slick. One brand name is "Fu-seal" [unsure of exact spelling]. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
	Register to Reply Good Answer (Score 2)

Noudge79 Guru Join Date: Feb 2011 Posts: 1119 Good Answers: 11	#4 In reply to #3 Re: Welding Applicable/Recommended For Sizes of Pipe 03/09/2011 11:03 PM
	Thanks man, that's quite informative side of yours. Cheerz __________________ " To infinity and beyond" - Buzz Lightyear
	Register to Reply

These comments received enough positive votes to make them "good answers".

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (66 right now) Show Members