How competent is competent? More importantly, how much might it actually cost your operations if you were to entrust your pumps to the wrong shop?
This article is the last installment in a four-part series based on a presentation delivered at the 2007 NPRA Reliability & Maintenance Conference in Houston, TX. As in the previous installments, (which ran in the July and September 2007 and February 2008), the authors discuss how to distinguish competent pump repair operations.
In this fourth and concluding part in our series on non-OEM pump repair facilities, we discuss two actual case studies. As you read on, please recall that we coined the acronym “CPRS” to convey the term Competent Pump Repair Shop.
Repair case study #1:
Two IR Type J4x 15 lean amine pumps The first of our two case studies concerns the repair of two IR Type J4 x 15 radially split, double suction, betweenbearing pumps purchased in 1982 for lean amine service. Figs. 1 through 3 provide specifics.
The pumps were to be repaired using new 316 stainless steel casings and heads furnished to a CPRS by the refinery client. The client had bought these parts from the “current” OEM—a successor company to the initial OEM. While one pump was being repaired, the other pump remained in service, operating without a spare. However, the new casings and heads required considerable rework before they could be used. This rework included:
1. Sleeving and re-machining an oversize stuffing box bore;
2. Re-machining the two spiral wound gasket faces;
3. Weld-repairing a sand inclusion on a stuffing box face;
4. Re-facing the stuffing box faces to remove steps caused by the milling operation;
5. Re-machining two stuffing box bores that had been damaged so that the seal gland pilot would not engage. Continue reading