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  1. fdomin

    New fire system tie-in to existing plant fire water tank

    Hi all, In a project we are dealing with, our client wants to eliminate the fire water tank from a future natural gas compressor station. They are planning to use the existing gas plant fire water tank, located 900 meters away and 20 meters below the compressor station grade. A new 14" pipe is...
  2. fdomin

    Regeneration gas aircooler thermal expansion.

    Thanks for you answers, I´m aware that multiple split headers may be required. Regarding other operating cases, I´m checking low air temp condition, but this is a warm climate location and freezing will not be and issue (but hidrates could form).
  3. fdomin

    Regeneration gas aircooler thermal expansion.

    I´m designing the regeneration gas aircooler of an NGL plant. API 661 ask for methods of restraint relief for multipass bundles with temp. difference larger than 200°F, which is the case of this equipment. I have tried multipass bundles (4 to 6 passes) with different tube pass configurations as...
  4. fdomin

    Mol sieve regeneration gas heater / WHRU

    dcasto, As you stated, our biggest fear is tube failure. In your case the only problem was backfire? I´m worried about natural gas staying stagnant in tube. What material should be used in that case as flue gas is at 1600°F? Emmanueltop, We are planning to add some extra heating equipment...
  5. fdomin

    Mol sieve regeneration gas heater / WHRU

    We are designing a large NGL plant and for regeneration gas heater our first choice is to use a coil in WHRU using turbine exhaust. 4 turbocompressors will be installed for residue gas, all with WHRU. One coil for regen gas should be installed in each WHRU to allow regeneration if any compressor...
  6. fdomin

    Remote I/O rack & control panel with HC900

    Thanks danw2! Your help was of great value. PS: when I stated 485/ethernet i meant some type of conversion.
  7. fdomin

    Remote I/O rack & control panel with HC900

    dawn2, Thanks for your answer. Both compressors will be remote to the controller. I read about the Prolinx gateway, so you are confirming it, but how is it connected? After 485/ethernet conversion, should it be connected to the ethernet switch? This switch should concentrate data from the...
  8. fdomin

    Remote I/O rack & control panel with HC900

    I would like to understand required connection of a remote rack and a remote compressor control panels to a HC900 controller. The rack and the control panel are for new equipment to be installed and the HC900 is existing. Signal from the remote rack goes to a remote ethernet switch, then to a...
  9. fdomin

    Propane carryover into twin screw compressor

    zdas04, Thank you very much for your answers. I think I´ll follow your advice.
  10. fdomin

    Propane carryover into twin screw compressor

    zdas04, As you stated, it is an oil-flooded screw. Maximum expected velocity in the scrubber is 4.9 ft/s, that is a K factor of 0.45 at suction P&T (30 psia & -11°F). The scrubber has a two layer demister, the first one has a density of 5 lb/ft3 while the upper demister has a density of 12...
  11. fdomin

    Propane carryover into twin screw compressor

    We are planning a revamp of a gas plant and when checking the refrigeration system velocities in compressor suction scrubber are exceeded, then liquid carryover may be expected. What could be the consequences of excessive propane carryover to the compressor? Thanks,
  12. fdomin

    Standby pump suction pressurized

    Thanks BigInch. Now the question is why most pump systems have their suction side designed according to max suction pressure and not discharge pressure. Can we regard on operating procedures to avoid increasing suction rating?
  13. fdomin

    Standby pump suction pressurized

    Have you ever seen the suction of a standby pump being pressurized up to the discharge pressure of the running pump? Could this happen if the standby suction line is closed and its discharge line open, regardless of the check valve presence? In this case rating of suction side instruments (low...
  14. fdomin

    Flow switch in pump discharge line

    Tipically I have seen low flow switches installed in pumps suction lines. Is there any restriction for installing low flow switches in the discharge lines? The only disadvantages I can see of installing these flows in discharge lines are the increased pressure rating of the instrument and...
  15. fdomin

    Thermosyphon Reboiler Simulation in Hysys

    There´s an easier procedure without adding side stripper. It is as follows: 1-Start with a standard converged column with kettle reboiler 2-Enter the column environment. In the reboiler view change bottoms outlet to a new stream that you can name e.g "Liquid to Column" 3-In tray section change...
  16. fdomin

    Twisted tube heat exchangers usage in crude service

    Can anyone give references about the usage of twisted tube heat exchangers in crude preheat trains, specially with HGO, HVGO, atmospheric tower bottoms, or vacuum residue as the heating media? Thanks
  17. fdomin

    Pumps w/VFD blocked outlet protection

    BigInch/dcasto, We are installing the preflash system between the last heat exchanger an the fired heater. Nowadays the pressure upstream the heater valves is fixed by a PT that sets the speed of a booster pump downstream the desalter. Pressure at the heater is defined by column pressure and the...
  18. fdomin

    Pumps w/VFD blocked outlet protection

    BigInch, Thanks for your answer. I can see that I didnt explain my system correctly. I will try to explain it better. The pump suction vessel is a preflash drum and flashed crude is then pumped to a fired heater. An existing pressure controller sets the speed of the speed controller to...
  19. fdomin

    Pumps w/VFD blocked outlet protection

    We have a pair of crude oil centrifugal pumps (680 m3/h - 3000 gpm) with large discharge head (192 m - 630ft )that need to be reused. They will be speed controlled by means of a VFD. Minimum flow is 1/3 of rated flow. Spillback is not desired as return to suction vessel is impractical (vessel...
  20. fdomin

    Flashing thermal relief PSV

    djack77494, thanks for your help. Should I also consider 10% overpressure? In that case pressure would raise to 468 psig and crude saturation temperature at that temp is 600F, then the relief would be liquid only. As you can see the case is in the border of liquid only/two phase relief.

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