DUŠAN UZELAC, SINIŠA BIKIĆ, MARKO DURDEVIC, ILARE BORDEASU CHANGE IN THE DEPTH OF SCRATCH ON THE POLYETHYLENE GAS PIPE AFTER SQUEEZING WITH THE SQUEEZE - OFF TOOL This research studies the influence of scratches on the polyethylene gas pipes after squeezing with the squeeze-off tool in order to stop gas flow due to an intervention of the gas pipeline. Problem occurs when there is a need to make a decision whether it is safe to squeeze the pipe with scratches. The goal of the research is to determine the change in the depth of scratches on the polyethylene gas pipe after squeezing with the squeeze-off tool. After the experimental research it was determined that there would be a change in the depth of scratch. The change of the depth of scratch positioned on the squeeze-off ear would be considerably bigger when compared to the depth change of a scratch positioned under the upper cylinder of the squeeze-off tool. Based on the resulting data, it is a recommendation of the author not to squeeze the pipe if it has scratches. If the squeezing if inevitable on the place where there is a scratch, the squeeze-off tool needs to be positioned under the upper cylinder of the squeeze-off tool.
Keywords: scratches, polyethylene gas pipes, gas flow,the squeezing