We have a Bran Luebbe reciprocating plunger pump with following parameters:2" diameter plunger, 3" length of stroke, 60 strokes/min, 1900 psig, 495 degrees F. Plunger is tungsten carbide cladded. Plunger is 10" long.
This is a polymer plant. we are pumping water, then product, then butane diol at above temp and pressure.
product is 70% water, with 30% polymer salt which can be considered abrasive I think...
We are using a base metal ring at front of the stuffing box, and intermediate metal ring like a lantern ring but with no flush in middle of stuffing box, and another metal base ring at back then a metal packing compression ring.6 rings of braided packing toward front of plunger between front base ring and intermediate ring and 6 more rings of packing between intermediate and back base ring. The 6 back rings of packing are palmetto 1350 kevlar, in the front we have 3 kevlars and 3 GTFE palmetto 1387.
all are precompressed to 2000 psi.
we constantly have to tighten compression ring due to leaks; and have to add a ring of packing at back about every 2 weeks. needless to say; after a few weeks of this, we have to take the pump down and rebuild.
the packing extrudes out into the process. it is braided rope packing.
I am changing the metal rings from nickel 200 alloy to wachasha 88 which is nongalling in hopes that will help some with longevity.
has anyone used hydraulic V-cup seal rings stacked in an application like this? I have been considering using a kevlar Vcup seal ring stack at the back near compression ring where things are cooler.
or can you offer any suggestions that could help!
Thanks to all!!!!!!!!!!!!!!