Fluid Components International VORTAB - Manual (Page 11)

VORTAB Flow Conditioner VORTAB ® Company
Doc. No. 06EN003269 Rev. D 11
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NPT Mounting
Threads per ANSI B1.20, American National Standard Taper Pipe Thread, NPT. Connection surfaces should be free of moisture and contaminants
(including storage compounds) prior to the application of thread compounds or Teflon tape. See Figure 2-12.
NPT Mounting with Pipe Dope Compounds
Apply a light, even coating of thread compound over the entire thread and seal areas, leaving the thread form clearly visible. The act of slapping a
“glob” of pipe dope on one side of the thread then relying on the pipe rotation during make-up to distribute is not sufficient. Teflon tape can be used
in conjunction with pipe dope, which would be wrapped around the applied pipe dope.
Thread Vortab into process connection and check for leaks. Mount flow meter into Vortabs with optional flow element connection.
NPT Mounting with Teflon Tape
Verify the Teflon tape being used is compatible with the media being isolated. There are approved Teflon tapes for gas service.
Although Teflon tape can inadvertently “seal” threads, it is actually intended to lubricate threads. The surfaces of threads are not smooth and as they
rub and pressure builds, they begin to gaul. This puts more material into the space between the mating threads, causing them to lock up prematurely.
Teflon tape eliminates gauling and promotes thread engagement, ensuring a tighter seal.
Wrap the male threads with Teflon tape. Wrap the threads in the same direction that the female end turns when attaching to pipe. Threads wrapped
in the wrong direction will unwind the tape when screwing mating threads together. A good rule of thumb is to wrap clockwise while looking into
the pipe from the threaded end.
Thread Vortab into process connection and check for leaks. Mount flow meter into Vortabs with optional flow element connection.
Figure 2-12. Typical Threaded VMR, VSR, and VEL