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Old 05-12-2009, 09:56 AM
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Lu47Dan Lu47Dan is offline
Connoisseur of Old Iron
Join Date: Mar 2006
Location: N/W Pa.
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Default Fitting Terminology , Elbows and related fittings .

There are three types of ninety degree elbows commonly available , the "standard" elbow , a street elbow , and the reducing elbow .
"Standard" Elbow
This is the regular 90* elbow that joins two pieces of copper tube of the same nominal size , it is used to turn corners , get around obstacles , from swings , and expansion loops in long runs . They are C X C
Reducing Elbows
These reduce the size of one of the legs , these fittings eliminate the need for a reducing coupling or a reducing bushing , thus eliminating extra solder joints . The fewer joints the less potential for leaks . They are C X C
Street Elbows
These are used to reduce the center to center distance to get a turn in the piping where space is tight . One end is nominal size , and the other end is belled to accept nominal sized tubing . They are C X F .
45* Elbows
There are two types of forty-five degree elbows commonly available , "standard" 45* elbow and street 45* elbow .
The "standard" 45* elbow is used mostly to make offsets in the piping system . I my opinion a 45* offset looks better then one made out of 90* elbows , but there is a time and a place for both types of offsets . They are C X C
Street 45's are used in the same way but are used directly out of a fitting . They are C X F
Related Fittings
There is a whole host of related fittings , but the majority of them are little use in a compressed air system . To name a few , drop ear ninety , Hyset elbows , these come in various designs mostly with female threads for attaching shower heads and the like .
  1. Elbow
  2. Reducing elbow
  3. Street elbow
  4. 45* elbow
  5. Street 45
Tomorrow on to tee's
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