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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...

Thank you for your reply JJPellin, maybe I was not clear with my question. I would like to know basically the following: is an eccentric casing with cutwater mounted in a Barske pump (like Sundyne) more sensitive to experience internal flow recirculations than with concentric casings? As far as...

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...

Hello JJPellin and flexibox, many thanks for your replies. Sorry for the mismatch between the term barrier fluid and buffer fluid, in my case is buffer fluid as we work with an API PLAN 52. My question is focused in general considerations about sealing amine solutions. * I feel that light oil...

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...

Hello guys, does anybody have a light about this issue? Thank you so much for your help! Marc

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...

Hello metengr, as we will have soon a meeting with the insurers I would like to be sure that the proceeding we are following safely enough and if it supported by a norm it would be better for us. Even though, if nothing is written about this issue, maybe it's up to the user the frequency to be...

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...

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...

Hello David, many thanks for your help. In the case that I'm studying to consider a mass of 453 kg (which considers 1/3 crosshead) gives me a inertia force of 82 KN which leads into don't having reversal load on the pin. On other hand, if I consider the complete weight of the crosshead (which...

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...

Thank you everybody for your comments, I've found a copy of NFPA 25 and I see that the parameters to be monitored are flow and net pressurre, the goal is to meet the pump requirements, not the system requirements (which take account the suction pressure). Marc

Thank you very much for your quick reply, it's been very useful. I'll check the sites you've mentioned in order to get further information. When you say NET pressure, you mean then the pressure at the discharge of the pump (suction pressure+differential pressure)? I am from Spain and here maybe...

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...

Hello both, I am sorry because of the delay in my answer. I am grateful of your kind help. As you have said, the best solution would be to use a clean external source of flushing but at this moment we can't assume this modification. What I've seen in this sela as good as other ones that work...

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...

Thank you for your replies, I am discussing the issue with the seal manufacturer and his opinion is to install a plan 01/62, as he says that plan 02 is not good to vent the stuffing box. We are still on it, if I could grasp more information I would let you know. Thank you so much for your kind...

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...

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...