CHERNE
PLUG SAFETY
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BACK CHERNE
MAIN PRODUCTS PAGE PLUG SAFETY |
NEVER ENTER THE DANGER
ZONE!
THE DANGER ZONE EXISTS IN FRONT OF THE PLUGGED
PIPE OPENING IN AN AREA
WHICH EXPANDS OUTWARDLY IN A CONE SHAPE.
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| GENERAL
SAFETY & USAGE INSTRUCTIONS |
1.
DEATH, BODILY INJURY AND/OR PROPERTY DAMAGE MAY RESULT IF PLUG FAILS FOR
ANY REASON.
2. READ AND UNDERSTAND THIS SAFETY INSTRUCTION SHEET BEFORE USING PLUG.
3. MUST WEAR SAFETY GLASSES AND A HARD HAT.
4. DO NOT ENTER DANGER ZONE WHEN PLUG IS IN USE.
5. MEASURE PIPE DIAMETER BEFORE SELECTING PLUG.
6. INSPECT PLUG FOR DAMAGE BEFORE AND AFTER USE.
7. NEVER USE A PLUG IN A PIPE SIZE DIFFERENT FROM RECOMMENDED.
8. ALWAYS ATTACH AN INFLATION EXTENSION HOSE SO PLUG CAN BE INFLATED AND
DEFLATED FROM OUTSIDE THE DANGER ZONE.
9. NEVER REMOVE THE INFLATION HOSE UNTIL ALL BACKPRESSURE IS RELEASED
AND THE PLUG IS DEFLATED.
10. MUST INFLATE PLUG TO THE PRESSURE SHOWN ON PLUG.
11. ALWAYS USE PROPERLY CALIBRATED PRESSURE GAUGES.
12. DO NOT EXCEED RECOMMENDED MAXIMUM ALLOWABLE
BACKPRESSURE (REFER TO THIS SAFETY INSTRUCTION SHEET)
13. ALWAYS RELEASE BACKPRESSURE FROM THE PIPE FIRST, BEFORE DEFLATING
PLUG. |
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Stand Clear of The
Danger Zone!
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How
to calculate pipeline forces and pressures. 1) Determine the inside
diameter of the pipeline in inches. 2) Determine the maximum
backpressure. 3) Calculate the pipe area in square inches. 4) Calculate
the force the plug must withstand.
Example with 36" pipe: 18" x 18" x
3.14 x 5 psi = 5087 POUNDS OF FORCE!
Calculating pounds of force aid in building plug
blocking systems. It also illustrates the tremendous force generated by
a sewer air test.
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| Always
block plugs when conducting air tests! |
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SPECIAL
NOTE:
Pressures being exerted on a plug,
regardless of the medium (liquid, water or air) are the same. Ten (10)
PSI water is the same as ten (10) PSI air. However, AIR IS A
COMPRESSIBLE MEDIA. Therefore extreme caution should be observed when
air testing.
Air back-pressure ratings reflect
absolute back-pressure capabilities. Common engineering standards have
been used to convert head pressure to PSI. It is imperative to block
pipe plugs when performing air-pressure tests and to ensure no one is in
the zone of danger when a plug is in use. (Please see our Safety and
Instruction Manual for complete details.)
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