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  1. vjr0512

    Any forum for PET continuous polycondensation and Textile Machine

    Dear All, I'm presently doing Project Management Consultancy (PMC) activities for polyester continuous polycondensation unit with yarn and fiber spinning units namely POY, DTY, FDY and PSF. Can anybody help me to find forum where I can get support from experts to clarify questions related PET...
  2. vjr0512

    Plate heat exchanger Material

    Dear all For one of the project, we have been asked to select Duplex stainless steel material for the Plate heat exchanger Plates as the Chloride content in the cooling water is more than 300 ppm. Vendor had offered for 254SMO and when enquired they informs that Plates are not available in...
  3. vjr0512

    Compressor blowoff valve-reg

    Thanks george for your response... Would like to inform that this is an integrally geared compressor with 8 stages. As this compressor loop is not designed for settle out conditions we have not envisaged to have multiple NRVs as given in compressors designed for settle out conditions. So the...
  4. vjr0512

    Compressor blowoff valve-reg

    Thank you very much 1503-44 and georgeverghese for your responses This Blow off valve is provided to ensure quick depressurization of the hold up volume between the compressor discharge and the NRV. As the Anti surge and PSV tapings are upstream of the NRV and these valves being located at a...
  5. vjr0512

    Compressor blowoff valve-reg

    Thanks georgeverghese for your response As you know the BOV is provided to ensure the quick depressurization of the high pressure CO2 gases in the discharge side of the compressor. The compressor is provided with 2oo3 high pressure trip at the discharge side. Also we have a non-slam type axial...
  6. vjr0512

    Compressor blowoff valve-reg

    A blow-off valve (4" ANSI , Cl 1500 Stainless steel SS316 Globe valve) is installed at the discharge line of a CO2 compressor ( Integrally geared) before its NRV and the compressor discharge pressure is 160 barg. This blow off valve is provided with a fail open actuator. . During HAZOP study a...
  7. vjr0512

    Controlled volume pumps capacity control

    Thanks a lot for all the wonderful answers. bimr, whether Milton roy is the only vendor who supply this VFD drive controlled volume pumps? Unless we require the turndown less than 10%, the milton roy option would be a costly proposal i suppose.
  8. vjr0512

    Controlled volume pumps capacity control

    For the Chemical dosing packages where mostly controlled volume (diaphragm type) pumps are used, for the capacity control, the stroke of the pump is varied either by manual or automatic ( motorised actuator) . Client prefers to have VFD for the capacity control as they have experienced problems...
  9. vjr0512

    AVR

    Thanks to all for the responses. Actually it is a 2.5 MW DG set for a fertilizer plant and we have 3 machines of the same size to be integrated. This DG is not for captive power generation but for Emergency power (when the Gas turbine generator fails )for safe shutdown and during start up of the...
  10. vjr0512

    AVR

    We are finalizing the Diesel Generator specification and as per Client specification we have asked to consider redundant AVR for the DG set. Any significance on this requirement? Cummins do not have this feature. Thanks to clarify.
  11. vjr0512

    Chloride corrosion

    In one of the Shell and Tube Heat Exchanger in the Polypropylene plant , the low temperature service calls for the LTCS material for the tubes . But the chloride content in the circulating cooling water is as high as 600 ppm. The temperature of cooling water outlet from the exchanger will be...
  12. vjr0512

    Inside Room Condition for Substation

    Dear all, We are now doing FEED refinery project in West Coastal Region of India in which a substation is envisaged around 2000m². The max ambient temp is 45°C. Substation building accommodates switch gears, panels, MCC, MLDB, etc. I understood from some of the owner specification in previous...
  13. vjr0512

    Fabricating steam lines for a heat exchanger

    We are in the process of fabricating steam lines for a heat exchanger. We have ball valves of 6" and 4" size for 50 barg pressure that are to be welded in this steam line. The steam is used only for this heat exchanger and then gets connected to the Low pressure steam header after exchanging the...
  14. vjr0512

    Emissions

    Dear bcd I agree with your views. However in this present application, there is no temperature rise expected from its ambient temperature ( 35 Deg C) and pressure is defined by the discharge pressure of the dosing pump ( 2 bar)and is injected inside the tank that are operating at atmospheric...
  15. vjr0512

    Emissions

    Hi Danlap Thanks for ur prompt response. coming straight to the point, the present construction at site calls for immediate dispatch of the valves that are designed and complying to FET class B where as specification calls for FET Class A. As you will be aware the design of the valves between...
  16. vjr0512

    Emissions

    Dear Danlap Thanks for your response . Was out of country and could not revert back.My apologies Basically my query was to know , whether these chemicals like sulphuric acid and Caustic solutions that are in atmospheric temperature used for dosing for pH corrections in effluent treatment...
  17. vjr0512

    Valve type

    In continuation with the above, based on the delivery schedule, Contractor suggests to use Reduced bore ball valve. The main steam line is 6" and when it comes nearer to this ESD valve, the line size reduces to 4" and actual reduced bore of the ball valve is 2". Contractor confirms that 2" size...
  18. vjr0512

    Mechanical seal maintenance

    We are using VS1 type pump (fitted with single Mechanical seal catridge type )for pumping the Treated effluent to the sea. The kw rating is 430. The client specification calls for Spacer type coupling for all the pumps and somehow this got missed out during the procurement and the pump...
  19. vjr0512

    Gas Tight Dampener

    For the Electrical Substations and the Field Auxillary buildings located in the safe area, the Client specifications calls for Gas tight dampener ( fire dampner) with Motorized type. Where as the EPC contractor prefer to give Pneumatic type and says the action will be quick. Need to know...
  20. vjr0512

    Emissions

    In one of the project, for the 96% sulphuric acid service and caustic service, the client specification is asking to comply with the Fugitive emissions class A for the valves. As for as i understand, is the above chemicals that are in liquid state are to be considered under Fugitive emissions...

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