What is the difference between SDR 35 and SDR 26 pipe?
Both pipes have the same outside diameter. SDR 35 has a thinner wall that SDR 26.
Does Cherne offer a flow-through plugs?
Yes. Cherne offers the T-Handle Gripper as a flow through plug.
What gripper should be used when blocking a hole?
Mechanical plugs can be used to block an opening (Grippers are mechanical plugs). Be sure to use the correct size Gripper for the opening.
What is the maximum temperature that the original gripper plugs be exposed to?
Gripper plugs have natural rubber O-Rings. These O-Rings allow for operating temperatures between 0° F to 125° F. Consult engineering for usage outside this temperature range.
Does Cherne offer chemical resistant mechanical test plugs?
Yes. Cherne offers two chemical resistant mechanical plugs: The Cherne Well Monitor Plug and the Cherne Petro Econ-O–Grip.
Why is it important to know pounds of force calculation?
This calculation is important to the end user and helps them understand the forces behind the plug so that they can decide the proper way block the plug.
What is the formula to calculate backpressure?
Backpressure is defined in PSI (pound per square inch) or feet of head.
Simply read the gauge pressure for PSI.
For feet of head, calculate height of water over the centerline of the plug.
Example; 100’ line at 1% slope with a 10’ manhole (100 x .01) + 10 = 11 feet of head.
How long can a Cherne pneumatic plug be expected to stay in good condition?
This answer depends on how the plug is maintained. If the instructions are followed in the Cherne Safety Instruction Manual, it is not unusual for the plug to last for many years. If the instructions are not followed, a plug can be destroyed during the first use. Cherne pneumatic plugs come with a 2 year warranty from date of manufacture.
What is the definition for feet of head?
Feet of head is the height of water over the center line of the plug.
Which inflatable plugs are repairable?
There are patch kits available for Urethane plugs. Other plugs that can be patched or have the bag replaced, are as follows; 15”-30” / 24”-42” / 20”-40” / 24”-48” / 24”-60” / 48”-72” and 54”-96”.