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  1. CHoff07

    Does presence of H2S> 50 ppm in Pumped fluid require use of Double Mechanical Seals

    While this is typically customer/site specific, H2S has an IDLH (immediately dangerous to life and health) exposure limit of 100 ppm. Therefore, many people have historically set this as the basis for specifying dual seals. With that said, the short term exposure limit is 15 ppm and since a...
  2. CHoff07

    Is it Ok to utilize API plan 52 & 31 for Benzene OH6 pump seal support system ?

    mkfe3005, The use of API PLAN 31 is a standard for Sundyne as the cyclone separator is built into the pump casing (not all models but most 300 series OH6s). The use of an unpressurized dual seal, API PLAN 52 meets the minimum HSE requirements due to the presence of Benzene. This sealing...
  3. CHoff07

    GAS SEALS

    You are going to need to provide some additional information. 1. What type of equipment are we talking about (centrifugal pump or compressor)? 2. What is the application/service? 3. What are the fluid properties (will depend on the type of equipment)? 4. Can the process handle a small amount of...
  4. CHoff07

    Mechanical Seal Problems - ECoat Paint and Ultrafiltrate as Barrier Fluid.

    Don, I have more questions before I can help give answers. I'm in O&G and not familiar with paint application but RCFA's are still RCFA's Can you provide some more information regarding the seal failures you are experiencing? What do the outboard seal faces look like after the failure? Are they...
  5. CHoff07

    Thermal Relief Valve on Cooling water lines for Seal Coolers And Seal Pots

    API 682 3rd and 4th Edition, Section 9.8.3 has a decision point for the inclusion of thermal relief valves (TRV)for components that may be blocked in by isolation valves. We are considering adding TRVs to the cooling water side of all API plan 23, 52 and 53 (A and B) flush plans as a standard...
  6. CHoff07

    Sundyne Pump Suction Line

    Is it ok to have an eccentric reducer right at the inlet of a Sundyne Pump? I have an existing installation of a Sundyne pump (LMV-311 3"x2") The suction pipe is 6" diameter schedule 80 from the vessel to about 4 feet from the pump, then a 6x3 reducer is used to get down to the pump's suction...
  7. CHoff07

    Hydraulic Power Recovery Turbine (HPRT) Design Questions

    I'm looking to explore the Pro's and Con's of various HPRT designs as it relates to long term reliability. It seems like different vendors offer different solutions and I'd like hear from people on the types of machine they have installed and the availability of the HPRT. All discussion will be...
  8. CHoff07

    Belzona for Pump Casing Repair?

    Has anyone had good luck making repairs to a corroded pump case using Belzona? How long could I expect the repair the last? What do I need to look out for during the process to ensure long lasting results? If not Belzona, what's a better method for pump casing repair? The process is Lean...
  9. CHoff07

    API Plan 23 Seal Flush Tubing Material for Water with Chlorides

    What piping or tubing material is best suited for water with small amounts of HCl and chlorides? I have an API plan 23 and the specified material is Stainless Steel tubing but I am concerned with SCC of the tubing. Do I need to Heat Treat the tubing before installing it (but after bending...
  10. CHoff07

    mechanical seal for VS4 pumps

    I suggest as a minimum single dry running mechanical seal. A better option because of the H2S would be a dual non-contacting dry gas seal – provided you have a N2 source nearby.
  11. CHoff07

    Process Fluid Leakage

    Are you sure the barrier fluid is getting contaminated and not breaking down due to the high temperatures. API Plan 53's generate a lot of heat and the higher you raise the barrier fluid pressure, the hotter everything runs, especially the outboard seal which has the highest differential...
  12. CHoff07

    Sundyne Gearbox Lube Oil Pump Expected Life

    Thanks for the information and discussion on the pins. This helps highlight where the weak links are in this type of setup. Location of the equipment will play a big role in how it gets maintained. With the proper maintenance they should last a while but as M&O practices vary between...
  13. CHoff07

    API 682 Warm up procedures

    I don't believe API 610 (for centrifugal pumps) or API 682 (for mechanical seals) have specific warm-up rates listed. This typically come from the pump manufacturer since they would be based on the materials of construction (for thermal growth) and the internal clearances which may be design...
  14. CHoff07

    Sundyne Gearbox Lube Oil Pump Expected Life

    I'm looking to get a better sense of the life of the internal gearbox lube oil pumps on high speed Sundynes. The local salesman stated that I should expect ~2 years which seems very low to me. I'm not sure if this is their conservative answer to cover any issues one may have or if this part...
  15. CHoff07

    How to lap the seal faces with simple and cheap equipment

    I'm skeptical of the "flatness" of the lapping plate you'd be able to make in the shop without prior experience. Your milling table may be flat but flat enough to achieve 2-3 He light bands, I doubt it. If your homemade plate does not give you the results you're looking for I suggest...

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