1502 hammer union orientation

[CRG]

Is there a standard flow direction for 1502 hammer unions?

I looked on the web and found Anson swing check flowing from male threaded end to female. Kemper swing check shows the opposite flow direction relative to the hammer union fittings. What is the standard/conventional flow direction through these fittings?

 

[CRG]

This is the reply I received for the folks at Anson:

Most companies set up their flow systems to flow into the female. This helps put the pressure against the lip seal (which is located in the female end). Therefore most equipment (and fittings) the inlet side is a female.

The hammer union designation is opposite to most other industries. The end with the external threads and lip seal is the female. The male end has the nut. The male sealing face inserts into the female, the nut slids up against the shoulder on the male, and engages on to the external thread of the female. This is often confusing, so much so that you will often hear the female referred to as "thread end" and the male referred to as "nut end". This insures that everyone is on the same page.

 

[Cockroach]

Yeah, this is the correct orientation in the oilfield also. It is preferred to have the male uphole.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada