Recent content by sinectica

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...