union and coupling

Jop

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Replied byon topic Re: union and coupling

1, "What is the basic difference between coupling and unions?"
Both of these fittings are normally only found or used in 2" (DN50) and smaller screwed or socket-weld piping. The basic difference between a coupling and a union is that a coupling is for joining pipe to pipe or pipe to a swedge. A union is made for joining and disassemble of a part of a piping system (a steam trap or control valve, etc) for maintenance or replacement.
2, "What are the advantages of ones over others?"
The union is a higher cost item than the coupling. When you are just joining pipe you would want to use the lowest cost item. When you need the ability to disassemble the piping for removal of an item then you must use the higher cost union.
3, "Where we use coupling and where we use unions ?"
Use couplings to join pipe in pipe racks. Use unions at steam trap or control valve manifolds for removal of items for repair.
4, "Is there any guidelines or code that specifies where should we use what?"
The use of couplings or unions is not a code issue.

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Are there any major disadvantages of using a union(that allows you to turn the pipes coming in from each direction) vs. a junction connection that is just basically joining two pipes together on long runs of pipe? Things such as pressure drops or anything else like that that would hurt your water system. This is in regard to some galvanized piping coming in directly off the water meter(with several elbows prior to the long run, water meter is low and long pipe run is along the ceiling. There is only one other union in this group of piping after the pipe has made several 90 degree turns. Adding a union on the long run would allow me to not have to replace a lot of piping that is further down the line that gets me to the next union. The reason that I am not replacing everything at this time is because we are getting our basement refinished and a wall is about to be built in this area of the piping. If we replaced this later, we would have to tear out the wall to get to the piping that I am talking about. House is about 55 years old and for all I know, the may be the original piping.

Thank you for any help you can give me on this and thanks for the help that you gave me on my previous question!!

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