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  • Users: terrorist
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  1. terrorist

    No of tubes in mutipass shell and tube heat exchangers

    Hi, Why the number of tubes in 2nd pass of the 2 pass shell and tube exchanger is higher than the no of tubes in the first pass.
  2. terrorist

    Isolation valves for isolation of reboilers

    Hello everyone, We have one LPG column installed in our unit for recovering LPG from natural gas by thermoexpansion process. There are 3 more columns namely LEF, propane and naphtha. Recently we countered leakage from reboiler tube of one column. For attending the leak we required...
  3. terrorist

    API compressor for bone dry gas

    We have installed a new compressor for nitrogen service which is designed and built as per standard API 618. The nitrogen which is being compressed is highly dry and dew point is around -100 deg C whixh makes it bone dry gas. Now, supplier is putting up a restriction not to use the highly dried...
  4. terrorist

    Double mechanical seal for hydrocarbon pumps

    We have single mechanical seals with API seal plan 11 installed with the OH1 pumps in pentane and naptha service. We are planning to replace these seals with dual mechanical seals so that HC does not leak in the atmosphere immediately in event of seal failure. Is there any guidelines or...
  5. terrorist

    Location of constant level oiler and sight glass on the bearing housings

    I am looking for guidlines on position of constant level oiler and sight glass/ level indicators on bearing housings. It is recommended by some experts that oil cup should be installed on the side of the bearing housing facing the shaft rotation at the bottom because this will eliminate the...
  6. terrorist

    High ampere and low flow problem

    We have one newly installed pump. Its a between bearings, axially split casing, single stage centrifugal pump. Suction is from a flooded tank. Pump is tripping at overload even at a flow lesser than 50% of the rated discharge. Saw its power curve. Input power vs flow curve slopes downwards. Is...
  7. terrorist

    Cavitation in mutistage pump

    Hi everyone, We have a pumping system to circulate amine in closed loop consisting of columns, filters etc and back to the storage tank. Now this pump is a axially split casing type 4 stage pump making the fluid reach 60 kg/cm2 at pump discharge. Tank is atmospheric pressurized tank.and level in...
  8. terrorist

    Max permissable value of pressure in balance leak off line

    Hi all, We have a no of installation of barrel type centrifugal pumps I.e. BB5 of different make. All of them have balancing piston type arrangement for balancing of axial thrust. Now when the clearance between balancing piston and throttle bush increases, we get a increase in balance leak off...
  9. terrorist

    pumps of different head in parallel operation

    hi all, We have a set of three parallel centrifugal (between bearing) pumps for transfer of diesel. One of these three pumps has different head than rest two pumps for same flow rate. Although pumps run, most of the time, one at a time but sometimes two pumps are required to operate in parallel...
  10. terrorist

    oil cup gets frequent empty out

    This is a centrifugal pump which this subject oil cup is attached to. what can be possible causes of a constant level oiler getting empty out frequently. 1)ingress of air in oil cup due to crack in oil cup. 2) ingress of air through the joint where oil cup is fixed to bearing housing 3)leakage...
  11. terrorist

    high discharge temp of air compressor

    Hi all we have a khosla make air compressor installed in our unit. Its a two stage double acting reciprocating compressor. Discharge of 1 st stage is passed through a water cooled inter cooler and outlet is fed to second stage. Generally we encounter with 2nd stage high temp problem while 1st...

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