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<blockquote data-quote="mat3833" data-source="post: 8754674" data-attributes="member: 587645"><p>It's not about "precisely knowing how much power". As I have said before, there is no measurement, no quantifiable data, simply recommendations that certain builders put out. Combine that with some good old fashioned logic and that's all I need. Resin doesn't like to bend much. But if you bend it slowly and gradually you can form small cracks in the material and essentially soften the resin to make it "flexible". It's a pretty simple concept. </p><p></p><p>The main comparison I can give you from my line of work is the high-pressure seals inside the intensifier pump. They are small, maybe 1.25 inch OD 1.125 inch ID 1/8th inch thick "seals" made of delrin. There are 4 in total, 2 are angled one side for a compression fit once installed, one has a closed face on both sides and an o-ring sealing the OD, and the last has a closed face on one side and an open face on the other with an o-ring sealing the OD. The O-rings are a blend of resin, Teflon, and Buna-n. </p><p></p><p>This particular arrangement of seals has a "wear in" procedure for proper sealing and longevity. We run our intensifier pump at 2 different pressures, low pressure which is 15,000 PSI and high pressure which is 62,000 PSI measured at a dead head. Open head pressures (aka water jet is active and cutting) are roughly 13,000 PSI for low pressure and 58,000 PSI for high pressure. The proper procedure is to bring the pump online and build dead-head pressure to the low setting and let it remain there for at least 60 seconds. Then you transition to low pressure cutting using a program that runs 100 inches of cut at 15 inches per minute. Following that program, high pressure dead head is selected for another 60 seconds. Once that is complete wear in is complete. Seal life is rated between 200 and 250 hours of operation at high pressure stroke rate. Wear in has been skipped accidentally on a few occasions and seal life on those was below 100 hours, the highest life I have seen from a set of seals has been 340 hours, I personally replaced that set of seals and made sure all surfaces were as clean is a could make them and I doubled the low pressure wear in procedure. </p><p></p><p>You can measure how well the seal assemblies are actually sealing by checking the stroke rate of both left and right side of the pump. An average stroke rate on a fresh rebuild is 34-37 strokes per minute, first startup after a seal job usually sits at 46 SPM and as the seals wear in the stroke rate drops down to the 34-37 range. maximum stroke rate before warnings start going off is 45 SPM and the machine will shut down if SPM exceeds 51 on either side of the pressure head. </p><p></p><p>Matt</p></blockquote><p></p>
[QUOTE="mat3833, post: 8754674, member: 587645"] It's not about "precisely knowing how much power". As I have said before, there is no measurement, no quantifiable data, simply recommendations that certain builders put out. Combine that with some good old fashioned logic and that's all I need. Resin doesn't like to bend much. But if you bend it slowly and gradually you can form small cracks in the material and essentially soften the resin to make it "flexible". It's a pretty simple concept. The main comparison I can give you from my line of work is the high-pressure seals inside the intensifier pump. They are small, maybe 1.25 inch OD 1.125 inch ID 1/8th inch thick "seals" made of delrin. There are 4 in total, 2 are angled one side for a compression fit once installed, one has a closed face on both sides and an o-ring sealing the OD, and the last has a closed face on one side and an open face on the other with an o-ring sealing the OD. The O-rings are a blend of resin, Teflon, and Buna-n. This particular arrangement of seals has a "wear in" procedure for proper sealing and longevity. We run our intensifier pump at 2 different pressures, low pressure which is 15,000 PSI and high pressure which is 62,000 PSI measured at a dead head. Open head pressures (aka water jet is active and cutting) are roughly 13,000 PSI for low pressure and 58,000 PSI for high pressure. The proper procedure is to bring the pump online and build dead-head pressure to the low setting and let it remain there for at least 60 seconds. Then you transition to low pressure cutting using a program that runs 100 inches of cut at 15 inches per minute. Following that program, high pressure dead head is selected for another 60 seconds. Once that is complete wear in is complete. Seal life is rated between 200 and 250 hours of operation at high pressure stroke rate. Wear in has been skipped accidentally on a few occasions and seal life on those was below 100 hours, the highest life I have seen from a set of seals has been 340 hours, I personally replaced that set of seals and made sure all surfaces were as clean is a could make them and I doubled the low pressure wear in procedure. You can measure how well the seal assemblies are actually sealing by checking the stroke rate of both left and right side of the pump. An average stroke rate on a fresh rebuild is 34-37 strokes per minute, first startup after a seal job usually sits at 46 SPM and as the seals wear in the stroke rate drops down to the 34-37 range. maximum stroke rate before warnings start going off is 45 SPM and the machine will shut down if SPM exceeds 51 on either side of the pressure head. Matt [/QUOTE]
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