The control valve end connection may have flange connection,
threaded, or even welded end. Flange connection is the most common control
valve end connection in the oil & gas application. Other connection such as
threaded or welded end is only used in particular application.
The type of the
control valve end connection shall refer to any project specification or a
piping class data sheet. In general the
valve size 2” and above usually shall have a flange connection, threaded
connection is acceptable for 2” and below.
Welded end control valve connection is rarely used except for an
application that requires no leakage in the connection between valve and pipe
line or any pipe stress consideration.
The connection
between flange and valve body are preferably used an integral body flange
casting. It means the valve body and a flange, casting together so that there
is no welding requirement to joint the valve and the flange.
In case the vendor
couldn’t have an integral body flange casting, as a rule of thumb used a weld
neck flange that require a butt weld or full penetration weld to connect flange
and valve body. Later on, this weld will require a NDE (Non Destructive Examination)
Radiographic Test.
Slip on flange that
use a fillet weld shall not be used because fillet weld is weaker than butt
welded. Socket weld flange that use fillet weld may be used for valve 1 ½ inch
and below. Even though socket weld flange also use fillet weld, but the
internal weld of this flange increase the fatigue strength more than the slip
on flange. This flange is allowable for small size of connection due to
difficulties of but weld perform in such size. All fillet weld connection will
require a Magnetic Particle Examination or Liquid Penetrant Test.
There are three types
of flange facing that will be used in the valve end connection as follow:
1.
Flat Face Flange (FF
Flange): used for low pressure or low valve class such as class 150.
2.
Raised Face Flange (RF
Flange): used for medium valve class such as class 300 and class 600.
3.
Ring Type Join Flange (RTJ
Flange): used for high valve class such as class 900 and above.
Even though the
flange facing have their suitable class, instrument engineer shall check this
classification with the piping class data sheet for a particular project.
All flange connection
of valve shall be as per ASME B16.5 “Pipe Flanges and Flanged Fittings”
Basically, flanges are cast or forged steel rings, which are created to fasten pipe sections together. They also affix pipes to pressure receptacles, pumps or any other item that needs to be connected. They are generally joined together by the processes of welding, threading or bolting.
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