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Subject: Flange By Union Adapters

Question:

My Company rents oilfield equipment, and we had a Flange X Union Adapter come apart during a manifold hydro test. It failed in such a way that it appeared to simply break in two, right in the middle, where it appeared to be welded together. Fortunately no one was hurt, but I have been charged with making sure we remove all of the units we own that may be likely to fail.

How would you suggest I should go about this task?

Answer:

We suggest you investigate to find if your company has files that include Material Test Reports and Hydro Test Records documented for your pressure control and pressure containing inventory items. If you find these, you can probably have confidence in the equipment so documented.  

At this time (2016), manufacturers that make these equipment units, having smaller flanges, usually make them from one piece of steel, either bar stock or a forging.  

We suggest you first sort and separate the units for which you find no documentation from those for which you do find documentation. Those which have documentation should be considered keepers.

Since you had a welded unit fail, you may choose to remove those welded units for which you can find no documentation. You can do this by sorting them, grouping them as those that appear to be made as one piece, and those that appear to have welded assembly. Below you will find drawings that display the general appearance of Flange X Union Adapters "Made Without Welding" and "Made by Welding," which may serve as a guide.  

So that no misunderstanding may exist, "Made Without Welding" means the part does not include welding as an assembly step. Welding may always come into play for cladding, overlay, inlay, and repair welding necessary because of field damage.  

Note: Adapters having large flanges with much smaller union halves attached, usually have welded assembly because of the cost to manufacture them in one piece. If their appearance seems satisfactory, you should Hydro Test these units and retain them if they pass the test.

In any case, for all of the units you wish to keep in your inventory for which you have no documentation that certifies Material Properties and a Hydro Test, you should, at a minimum, perform a Hydro Test, document the test results, and tie the document to your inventory records.

Stand back during the Hydro Test. If any units fail on test, discard the pieces.   

UNITS WITH MALE HALF UNION
MADE WITHOUT WELDING
MUST HAVE REMOVABLE NUTS
WITH SEGMENTS AND RETAINER RING
 
Flange x Weco   Flange x Weco
 
UNITS MADE BY WELDING WITH MALE HALF UNION
MAY HAVE A NON-REMOVABLE NUT
 
Flange x Weco   Flange x Weco
  

Caution: When tightening Hammer Unions, always wear safety glasses.

To see an example and dimensions of a Hammer Union with a Removable Nut. Click Here.

To see an example and dimensions of a Hammer Union with a Non-Removable Nut. Click Here.

 

At WOODCO USA the same knowledge and effort we put into this web site goes into every product we sell. If this Web Site helps you, or persons for whom you have responsibility, please reward WOODCO USA with your business.


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