Page 419 - Pipeline Pigging Technology

Pipeline Pigging Technology

LOW END RANGE

.1 .2 .3 .4 .5 .6 .7 .8 .9 l.» I.I 1.2
(INCHES)
PIG SQUEEZE

Fig. 10. Kick-off pressure vs pig squeeze for S.U.N.Engineering
'squeegee* cup-type pig.
9 through 11 show results for air-driven tests. For the water-driven tests, the
individual test results list the peak pigging differential pressure observed in
the transit spool and through the wye fitting along with the average velocity
of the pig in the transit spool, the average flow rate while in the transit spool,
and the flow conditions in the opposite side. The air-driven tests show similar
conditions, except the peak differential pigging pressure in the fitting is not
listed. As mentioned previously, the recorder used for the outlet pressure
transducer for air tests also recorded the tank pressure, rather than the inlet
pressure on the opposite side. This prevented the comparisons done for the
water-driven tests to directly measure the differential pigging pressure in the
fitting. The results for individual pigs (Tables 2 through 11) are presented in
order of increasing velocity.

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