This question should be discussed, as the answer is not a simple formula or calculation. The short answer is that there should be no force against the heater, but the pipe must stay in contact with the heater, with just enough pressure in the hydraulic cylinders to overcome drag.
We have several
animations on our website that guide you, including how to measure drag, but the best advice I can give you is to attend some training on HDPE fusion so that you have a good understanding of the fusion process before you begin. McElroy offers several courses, including a
mid-range operation course that will give you a good theoretical knowledge base and hands-on training. We also have certified instructors throughout the country (and actually, throughout the world!) that can also offer the same, high quality training.
If you cannot attend some formal training before you begin fusing, please make an appointment with your
nearby distributor and have them show you the proper fusion technique, or at the very least, please call your distributor or McElroy and let us talk to you about the process.
HDPE is a fantastic product, very dependable, and very forgiving, however I cannot stress enough how important it is that the fusion process be done correctly for the sake of safety, and for your own benefit in time and profitability. The cost is much less, both in time and money, to do the job right the first time, and your investment in some education will pay great dividends!
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