Inversion Tank Maintenance Issues

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“Did you change your liner material? I’ve been using your lining material and resin for several years and the past 4 jobs have been a real pain to get the material to invert. We’ve taken the pressure up to the maximum allowed in the tank and found that we’ve had to shake the tank and tubes to get the liner to move. We’ve been scratching our heads and thought that maybe the lining material had been changed?”

We have not changed the lining material, so the issue must be something else. Let’s look at all of variables to your jobs.

  1. Were the past 4 jobs typical to the other jobs you are used to performing?
  2. What was the resin/tube temperature at the time of inverting it?
  3. Have you tested the pressure gauge on your tank?
  4. Do you have any air leakage from the tank from seam welds opening or the viewing glass port not sealing properly?
  5. Are the roller bearings that support the spool shaft binding?
    a. Loose anchorage to the frame?
    b. Worn bearings?
    c. Resin build up around the shaft bearings?
  6. Any air leakage in the Kanaflex hose or hose fittings?

These are the issues we’ve seen in the past with most inversion tanks. All of them are made pretty much the same and the same issues listed above will apply to any of the various models offered in the market place.

So I’m assuming that if you’ve been lining for several years you’ve already ruled out items 1 and 2 above, however for newer installers those two items need to be considered. Moving to item # 3 testing can be easy. Remove the valve. Adapt a quick connect fitting that will allow you to plug the gauge into an air hose. Reduce the regulator pressure on the compressor you are using for testing to the maximum pressure that your gauge allows. Leaving it at a pressure above that will peg the gauge and make it read inaccurately in the future, so performing this step is a must do. Plug your gauge into the hose and open any valves so you can read the pressure on the gauge. It should match the gauge on the compressor. Now reduce the regulator on the compressor to 0 and monitor the reading on the pressure gauge. A properly working gauge should mirror the compressor readings.
If that passes your testing, move to the tank #4 and #6. Attach a solid Camlock cap to the Kanaflex hose. Replace the tested air gauge to the tank, close the viewing port, and fill the tank to rated maximum pressure. Inspect for air leakage. If the tank holds pressure move to item # 5. Repair any leakage as this will impede the inversion of your liner.

Tank Inversion

The spool inside the tank is very similar to a fishing reel. If the spool doesn’t turn freely the most likely issue is a bad bearing(s). Depending on the make and model, these bearings may have become worn, loosened from their anchor or became fouled with resin over time. If this is the discovered replacing the bearings should solve your inversion problem.

Another resolution would be to acquire a Quik-Shot™ inversion unit that contains no spool and can invert unlimited lengths of liner. For more information call Pipe Lining Supply at 888-354-6464 between 8AM and 4PM Pacific Coast Time Monday through Friday or Email us at info@pipeliningsupply.com.

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