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?
We suggest you investigate to find
if your company has files that include Material Test Reports and
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
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
UNITS MADE BY WELDING WITH
MALE HALF UNION MAY HAVE A NON-REMOVABLE NUT
Caution: When tightening Hammer Unions, always wear safety glasses.
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.