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Revised:
06/13/2011
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18
To:
Subject:
Requirements for testing adapter
flanges
Question:
Does API Spec 6A require a
Hydrostatic Body Test on Adapter Flanges?
Answer:
"Adapter
Flanges" usually means
Double
and
Single
Studded Adapters,
API Spec 6A considers these units
of equipment as Loose Connectors
and therefore does not require Hydrostatic Body Testing of these units
for the application of the
API 6A Monogram. Interestingly,
API Spec 16A, for Drill Through Equipment, requires that these same
exact units experience a Hydrostatic Test in order to bear the
API 16A Monogram.
API Spec 6A also
provides a definition for "loose flange" that includes the following
examples:
Blind,
Threaded
(Tapped),
Spacer
(Instrument),
Weld Neck
Flanges; and Studded or Other Connected Adapters. As
mentioned
in API Spec 6A, "Other
End Connector" (O.E.C.s)
must meet API Spec 6A design requirements for any unit of equipment with
an O.E.C. to bear the API Monogram. API's
definition of Loose Flanges allows the sale of Monogrammed O.E.C. Loose
Connectors that do not receive a production Hydrostatic Test.
The question asked
becomes more interesting when considering adapters such as
Flange X
Union Adapters. Since they have an extended neck, and the neck has a
connection located at its end, WOODCO USA interprets that portion of the
unit between the connections as a Body. WOODCO USA always tests these
Flange X Union Adapters. API Spec 6A,
19th Edition contains specific
dimensions for Flange X Lubricator
Connection Adapters
(male and/or female union halves
closed by a plug, secured by a threaded nut); this addition
specifies Hydrostatic Testing of
these Flange X Lubricator
connection (Union) Adapters.
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