15
WARNING NEVER EXCEED THE PLUG’S BACK PRESSURE
RATING! Maximum recommended back pressure ratings listed are for plugs
installed in clean, dry pipe. Other pipe conditions, such as a pipe with debris
or foreign substances on its surface, may signicantly reduce back pressure
holding capabilities. Harmful foreign substances may include grease, mold,
algae, sand and/or any other material that prevents solid contact between
the plug and the pipe wall. Pipe made from material having a low coefcient
of friction, such as polyethylene, or new pipe having traces of release agent
used as part of the manufacturing process may also reduce the back pressure
holding capabilities. Corrugated piping will also reduce back pressure
holding capabilities (by 50%–see page 18). IF SUCH CONDITIONS EXIST,
IMMEDIATELY NOTIFY YOUR SUPERVISOR OR SAFETY DIRECTOR
AND TAKE APPROPRIATE CORRECTIVE ACTION SUCH AS CLEANING
BEFORE PROCEEDING! FAILURE TO HEED THIS WARNING MAY CAUSE
PLUG DISLODGEMENT WHICH MAY RESULT IN DEATH, SERIOUS
BODILY INJURY AND/OR PROPERTY DAMAGE!
WARNING TREMENDOUS FORCES MAY BE RESTRAINED
INSIDE OF AND BY PIPELINE PLUGS WHEN THE PLUGS ARE INFLATED
AND USED! Total force exerted on a pipeline plug is directly proportional
to both the pressure and the pipeline area (refer to formula and example,
page 14). ANY BARRIER OR BLOCKING DEVICE USED TO RESTRAIN
THE PLUG IN A PIPELINE MUST BE PROPERLY DESIGNED AND
CONSTRUCTED TO SAFELY WITHSTAND THE HIGH FORCES INVOLVED!
FAILURE TO USE PROPER BRACING MAY RESULT IN DEATH, SERIOUS
BODILY INJURY AND/OR PROPERTY DAMAGE (SEE PAGE 32)!
CONVERSION TABLE
FEET-OF-WATER-HEAD TO PSIG
(Pounds Per Square Inch Gauge)
FT.-OF-
HEAD
PSIG
FT.-OF-
HEAD
PSIG
FT.-OF-
HEAD
PSIG
FT.-OF-
HEAD
PSIG
1 = 0.43 16 = 6.93 31 = 13.42 46 = 19.92
2 = 0.87 17 = 7.36 32 = 13.86 47 = 20.35
3 = 1.30 18 = 7.79 33 = 14.29 48 = 20.78
4 = 1.73 19 = 8.23 34 = 14.72 49 = 21.22
5 = 2.16 20 = 8.66 35 = 15.15 50 = 21.65
6 = 2.60 21 = 9.09 36 = 15.59 51 = 22.08
7 = 3.03 22 = 9.53 37 = 16.02 52 = 22.52
8 = 3.46 23 = 9.96 38 = 16.45 53 = 22.95
9 = 3.90 24 = 10.39 39 = 16.89 54 = 23.38
10 = 4.33 25 = 10.82 40 = 17.32 55 = 23.82
11 = 4.73 26 = 11.26 41 = 17.75 56 = 24.25
12 = 5.20 27 = 11.69 42 = 18.19 57 = 24.68
13 = 5.63 28 = 12.12 43 = 18.62 58 = 25.11
14 = 6.06 29 = 12.56 44 = 19.05 59 = 25.55
15 = 6.49 30 = 12.99 45 = 19.49 60 = 25.96
TABLE 1
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