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  • Users: sinectica
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  1. sinectica

    Mechanical seal and API Plan for desalted Crude Oil centrifugal pumps (Temperature: 150ºC)

    Dear all, I would like to know, based on your experience, which is the best seal (configuration) and API Plan for Crude Oil sealing. The service is desalted Crude Oil at suction conditions = 150ºC and 9.5 kg/cm2 (discharge pressure = 38 kg/cm2), centrifugal pump between bearings (United Pumps...
  2. sinectica

    Eccentric casing in high energy pump

    Hello guys, I would like to know if someone has experienced hydraulic problems in Sundyne pumps related to its eccentric casing (Z series). Does anybody studied the hydraulic problems (recirculations) and consequent erosion that could arise when having an eccentric casing (volute) in a high...
  3. sinectica

    Barrier fluid for lean amine pump

    Hello guys, We have some lean amine(a solution of lean amine) pumps with a very short MTBF of their mechanical seals (tandem seals with api plan 52). Generally in all of our centrifugal pump a light lube oil is used as barrier fluid. As we use to have problems with the amine pumps, I've thinking...
  4. sinectica

    Babbitt thickness on plain journal bearings on centrifugal compressors

    Good morning guys, I would be very grateful if someone could give me an idea, about his own experience, regarding the recommended babbitt thickness in plain journal bearings for a centrifugal compressor with these carachteristics: Power 300 kW (max electric motor power) Rotor weight 40 kg...
  5. sinectica

    Steam turbine overspeed trip

    Hello guys, I would like to know if there is any recommendation/guide or norm that indicates which is the frequency to carry out the overspeed trip tests for special steam turbines. We use to test the trip each 18 months, but it's based in our experience, not in any written guide nor...
  6. sinectica

    ISO 10816-3 : What's nominal power?

    Hello guys, I need your help in order to clarify the scope ANNEX B where are defined the different classes of machinery and the boundary vibration limits. Class II: medium sized machines 15 kW < P < 300 kW Class III: large sized machines 300 kW < P < 50 MW I would like to know if the...
  7. sinectica

    Crosshead's pin load in reciprocating compressors

    Hello guys, I would like to know which reciprocating masses I should consider in order to calculate the inertia force (load) on the crosshead pin of a reciprocating compressor. I have two different informations about this: * piston + piston rod + crosshead = total weight * piston + piston rod...
  8. sinectica

    Periodic test of firefighting pump

    Hello guys, we have a centrifugal horizontal pump for firefighting service in our plant. As far as I know we should periodically carry out tests on our pump in order to guarantee that it is in good condition. What I would like to know is : which is the parameter I should verify in terms of...
  9. sinectica

    API plan for sour water pump

    Hello, We are haing problems with single stage pumps that work with sour water (from crude oil desalators). Temperature: 120ºC These pumps have single seal with flush plan 41, with cyclone separator and heat exchanger and the seals doesn't work properly as they leaking after few months. The...
  10. sinectica

    Molten sulphur pump

    Hello guys, which is the best API plan for a mechanical seal of a overhung single stage centrifugal pump which works with molten sulphur? We are not sure of which is the best plan to use with a single mechanical seal. If anybody has experience in sealing this product I would be very grateful of...
  11. sinectica

    ISO 9906 degassed water

    Hello guys, I would like to know if ISO 9906 says that centrifugal pumps should be tested with degassed water in it's NPSHr test. If it does, is it possible to obtain degassed water without having a vacuum installation nor boiling the water to be pumped? Does exist any chemical product which...
  12. sinectica

    97/23 PED directive

    Hi, I know that there are some discrepancies in the applicability of PED directive for centrifugal pumps. Can anybody tell me his experience with this issue? Is it correct to say that the 'design critical factors' in centrifugal pumps are mechanical forces, vibrations and not pressure? If it is...
  13. sinectica

    Material: P Cu Al S IV of ISO 7989

    Hello, can anybody tell me the carachteristics of the material: P Cu Al S IV of ISO 7989 As I don't have the norm and I need to handle this information I would be very grateful if any help is sent. Thank you Marc
  14. sinectica

    packing and cylinder lubrication for reciprocating compressors

    I would to know which is the criteria for providing more or less amount of lubrication in a cylinder and the packings of a reciprocating compressor. Is ther any relationship with the cyinder diameter or working pressure? any help will be appreciated. thanks Marc
  15. sinectica

    saltwater vertical pumps

    Hello, any idea about what are the best materials to use for each component of a vertical saltwater pump? Thank you so much
  16. sinectica

    maximum peripherical speed in centrifugal pumps

    where can I find a table with the maximum linear speed of the fluid handled, depending on the material of the pump case? thank you so much, any contribution will be appreciated, Marc
  17. sinectica

    Periodic oscilation in power consumption of a reciprocating compressor

    What could be the reason of a periodic consumption(we see an armonic wave of the intensity, amperes) of an electric motor coupled to a reciprocating compressor of 4 cylinders? Could it be an error in the calculated inertial wheel? thank you so much, any contribution will be appreciated.
  18. sinectica

    Non-contacting, Steam Turbine Gas Seal

    Has anybody experience in Steam Turbine Gas Seals? Are this sealing method reliable. How about it's cost? I'm thinking about to change some traditional carbon ring seals of steam turbines into non-contacting seal. What could be the benefits? Thank you so much, Marc
  19. sinectica

    diaphragm compressors

    Does anybody know any web with technical information and troubleshooting about diaphragm compressors. I've already checked Burton Corblin and PDC Machines webs to get some information. Thanks a lot! Marc
  20. sinectica

    Air coolers for refinery services troubleshooting

    Does anybody know where can I find information about vibration analysis and troubleshooting for air coolers for refinery services? I suspect that I have some structural problems in some big fan coolers and I don't have a clear idea of how to solve them. I've checked API STD 661 but it doesn't...

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