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  1. Chengin

    Power Recovery Turbine - Pump

    Dear georgeverghese, Thank you for your words. I just would llike to know regarding reliability. If the turbine get failed with some reason, then will the pump operation be maintained by make-up power from motor immediately or there will be some impact?
  2. Chengin

    Power Recovery Turbine - Pump

    Hello, I have a question regarding Power Recovery Turbine. It is installed at the high pressure liquid side and produce electricity by letdown to medium pressure. This Turbine is coupled to the pump and the scheme is as attached capture. The point is that according to the utility summary, power...
  3. Chengin

    Anyone has experienced injection Flushing oil into valves and instrument lines.

    Hello I'm doing a new hydroprocessing project handling heavy residue fluid. From the Process Design, some valves are specified as flushing oil connections are necessary for those valves putting the oil continuously to prevent coke but the injection rate for each valves is not shown. (they are...
  4. Chengin

    Pulsation study when you modify piping system on Reciprocating compressor discharge line?

    To saplanti Thank you for your reply. So, you recommend pulsation study because there will be a new piping system, not because the compressors are old. Does it have nothing to do with compressor's device life?
  5. Chengin

    Pulsation study when you modify piping system on Reciprocating compressor discharge line?

    Hi, I'm chemical engineer working in a refinery. I'm working on a revamp project which installing some new equipment in existing process. New piping route will be added for it and the tie-in point is somewhere on discharge line of reciprocating compressor. We are not modifying existing...
  6. Chengin

    Criteria for choosing between Breech lock Type heat exchanger and D(TEMA) type heat exchanger

    Thanks for reply The drawing I attached is Modified D Type, which has diaphragm gasket. So it welds to channel part(seal weld).
  7. Chengin

    Criteria for choosing between Breech lock Type heat exchanger and D(TEMA) type heat exchanger

    Hi, I'm a project engineer working for a revamping project in a refinery. In our company, there are several RDS process unit, which processes under about 200bar. I found that some heat exchangers in RDS unit are breech lock type, which built 20years ago. But some heat exchangers in other RDS...
  8. Chengin

    Calculating NPSHa when 2 streams combines...

    To LittleInch Thank you very much. I understand what you meant. I was worried about that if I calculated the NPSHa was wrong. Because I calculated current situation, but NPSHa is lower than NPSHr even there is no problem now! Maybe it's because our crude oil's actual vapor pressure isn't that...
  9. Chengin

    Calculating NPSHa when 2 streams combines...

    Thank you for reply and sorry for my bad English. The tanks's ground level is higher than pump's ground level. So even the first tank's level is 2.9m, its flow goes to the pump (I can read the tank's level) with second tank which has higher level. (Eg. when 1 tank services its level falls , and...
  10. Chengin

    Calculating NPSHa when 2 streams combines...

    Hi, I'm a chemical engineer. I calculated NPSHa to review increasing crude charge rate. Usually the pump is run from 1 tank(there are 3 tanks), but during switching time another tank's nozzle open and the stream combines together. Switch starts when the first tank's level goes down 3.7m and it...
  11. Chengin

    Any guide of Piping deflection because of steam tracing....

    Hi, I'm a chemical Engineer work in a refinery. After a process unit construction, we found out that a pipe line is deflected like above pictures. What I found through googlings, they say normally maximum piping deflection is 1inch or 1/2 of nominal pipe dia. I checked my company's specification...
  12. Chengin

    Why use Transfer Line Exchanger in steam cracker Instead of Shell and Tube Heat Exchanger

    Hi, I'm working in a refinery. These days, I'm studying about Steam Cracking. In steam cracker, there is a heat exchanger called transfer line exchanger, which is different from S/T Heat exchanger. It's design makes effluent and water/steam flow the same upper side. I'm wondering why they use...

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