2.4 Retracting the AP-3
Pipeline pressure must be reduced to the maximum allowable insertion/retraction pressure prior to inserting and retracting the
AP-3.
The maximum allowable insertion/retraction pressure varies according to shaft size. Pipeline pressure should be reduced to at or
below:
• 1100 psig (
75 barg
) for 6 mm tubing.
• 1000 psig (
68 barg
) for ¼" tubing.
• 500 psig (
34 barg
) for ³∕₈" tubing.
• 250 psig (
17 barg
) for ½" tubing.
• 160 psig (
11 barg
) for ⁵∕₈" tubing.
• 115 psig (
7 barg
) for ¾" tubing.
• 65 psig (
4 barg
) for 1" tubing.
1.
If applicable, close outlet valve A (
Figure 1
,
Figure 2
, or
Figure 4
).
2.
Disconnect the customer-supplied tubing or fittings attached to the outlet.
3.
Firmly push down on the top of the probe shaft while slowly loosening the tube union assembly from the base or
flange. If retracting an AP-3 with blind flange, firmly push down on the top if the probe shaft while slowly loosening the
base from the blind flange.
Failure to ensure that adequate pressure is applied to the top of the AP-3 prior to retraction could result in unexpected
retraction of the shaft at great speed, which could damage the unit or injure the operator.
4.
The AP-3 will begin retracting from the pipeline.
5.
Pull up on the probe shaft to ensure that it has been fully retracted.
6.
Close the pipeline isolation valve.
7.
The AP-3 is now ready to be removed from the pipeline isolation valve for maintenance or to be moved to another
location.
11
IOM-009
MODELS: AP-3 and AP-3F
REV: D
13839 West Bellfort Street, Sugar Land, TX 77498
welker.com
Service Department 281.491.2331
