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Connection types (FF, RF, RTJ, NPT)

Connection types (FF, RF, RTJ, NPT)

Connection types (FF, RF, RTJ, NPT)

(OP)
What do you use to determine what type of end connection you will use on a fitting.
For instance when do you use ring joint instead of a raised face or flat face
What about NPT connections?
The reason I am asking is I have seen some use 600# RTJ and then use 600# RF later.
My initial thoughts are the smaller sizes use NPT because a flanged connection would be impractical

Future PE Engineer
Pet project I am working on to help other engineers, not much yet hoping to get it grow as I learn more
http://www.peexamquestions.com

RE: Connection types (FF, RF, RTJ, NPT)

Just search RF RTJ on this forum for plenty of ideas. This is a typical exchange http://www.eng-tips.com/viewthread.cfm?qid=343642

FF is only for cast iron, low pressure stuff #125, #150 or plastic flanges where low bending stress is allowed

RF goes from #150 upwards. Where you stop is more depenadnat on who you work for or what your plant piping spec says than anything else.

You don't often see #600 RTJ, but some companies love them so put them on #300 flanges. NPT is more common for instruments and items of 1" and below as flanges of that size get bulky and weigh a lot compared to the pipe size.

You will find as many ideas and thoughts as there are people commenting here....

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

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