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  1. cowpen

    Reciprocating Compressor Pulsation Control Design requirements

    thanks littleinch, pierreick for the input, much appreciated - "It is possible to commit no mistakes and still lose. That is not a weakness; that is life."
  2. cowpen

    Reciprocating Compressor Pulsation Control Design requirements

    littleinch, you're right that the first stage cylinder would feed into the 2nd stage cylinder. My understanding is that the normal configuration for the pulsation bottles are as such: 1st stage suction pulsation bottle -> 1st stage compressor -> 1st stage discharge pulsation bottle ->...
  3. cowpen

    Reciprocating Compressor Pulsation Control Design requirements

    I have a reciprocating compressor (2-stage vertical, double acting) for nitrogen services that is used to boost up the nitrogen pressure from about 5 barg to 35 barg, with a flow of 1000Nm3/hr. I’m trying to understand the basis of pulsation control that should be used for this reciprocating...
  4. cowpen

    Vibration acceptance criteria for equipment tested at lower loads

    I'm trying to gain some insight if there are any common practices for vibration acceptance criteria when an equipment is not tested up to it's rated load. For context: we have a generator which is connected to a turbo expander; the power generated would be a function of the process conditions...
  5. cowpen

    API 674 pulsation approach 1 and approach 2 requirements

    I'm trying to get gain some clarity regarding to the requirements for design analysis for pulsation and vibration mentioned in API 674; it mentions that the purchaser should specify the requirement for this analysis if required. Annex C of API 674 goes on to describe the different approaches for...
  6. cowpen

    Pumps for high viscous fluids

    EdStainless, DubMac, snassd, thanks for the input. Was generally curious regarding the threshold when it is considered "too viscous" for a centrifugal pump- glad to have my questions answered. Thanks again all.
  7. cowpen

    Pumps for high viscous fluids

    Georgeverghese, thanks for the input, will remember to consider the startup viscosity. Littleinch, the pumps are working fine and probably wont' be changed (as you mentioned, only the head and flow have increased). Just checking if there's a rule of thumb for pump selection- thanks for your...
  8. cowpen

    Pumps for high viscous fluids

    For context: I'm currently upgrading a pump for Low Sulphur Waxy Residue- the existing pump is a centrifugal pump with the following parameters (rated): Q = 70 m3/hr h= 160m viscosity at pumping temp (83 degC)= 10.2 cP density of fluid at pumping temp: 875 kg/m3 The upgrade consists of...

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