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  1. chief

    Did I size this orifice plate correctly?

    Flow thru' orifice, Q gpm = 25 x A x k x sq.root h A = Cross sect area in2 k = 0.6 for water h = differential head, Feet Convert to Metric if required. Use the gauge pressure instead of the pump curve, too many variables not allowed in curve, pipe losses ,filter restriction, worn pump etc...
  2. chief

    Pulsation dampener requirement

    To prevent air accumulation in the system pipelines ,fit an automatic air vent at the highest system point. As previously mentioned the system can be maintained full and pressured by the use of a jockey pump set to cut-in/out by a pressure switch arrangement. Offshore Engineering&Design
  3. chief

    Using venturi effect to empty a water column in a boats hull ?

    A quick easy and flexible solution is to use a type of spray painting pistol. These have a suction line to fit in a barrel or boat well and the motive power can be air or a tap off from a seawater supply. Offshore Engineering&Design
  4. chief

    Size and dimensions of vessel sea chests

    There are Marine Regulations regarding the size of sea chests and protection of sea mammals into the sea chest. The recommended sizing is to achieve a suction flow of 0.5 M/s,( approx. 1.5 ft/sec) which prevents the ingress of aforementioned mammals. This simple calculation will give you the...
  5. chief

    Pulsation dampener requirement

    A pressure surge is caused by an empty pipeline with air in it. The air is compressed as the water begins to flow and creates destructive water hammer effects. Fit a jockey pump ((Low power ,low flow) to maintain a full pipeline and possibly a little circulation line or safety valve to create a...
  6. chief

    RO Cleaning Cycle, when to do it

    A pre -filter of diatomaceous earth/sand , will greatly extend the working life of your membranes and reduce the neccesity of cleaning. Ensure a back flush arrangement is installed on the pre-filter, to facilitate its cleaning without the time-consuming job of dismantling. Offshore...
  7. chief

    Gearbox Backlash

    A ratchet and pawl assembly would maintain the tension and prevent slipping of the motor.It would not be difficult to retro fit. This is similar to the freewheel arrangement on a bicycle wheel rear hub or an anchor winch brake. Offshore Engineering&Design
  8. chief

    Safe Working Loads

    if it designed fOr 5T SWL, and tested to overload as per regulations], it should be stamped to 5T. Offshore Engineering&Design
  9. chief

    exhaust gases manifold for two units ( no. 4, 5 ) increased the temperature up more than 500°C and a

    Check your exhaust pyrometers, by swapping over from other cylinderss, as a first step. Also swap over or change fuel injectors.Check your turbo discharge air pressure and temperature is normal. Check the back pressure in your exhaust trunking. Offshore Engineering&Design
  10. chief

    Ball Bearing Failure

    It would greatly assist if the application of the bearing was known. I have seen bearing failures on Generator bearings due to electric tracking to earth via a bearing. This is difficult to detect and a proper earthing system is required. Another failure .already mentioned is caused by welding...
  11. chief

    Required motor power for centrifugal pump

    Check the pump has a thrust bearing and is bearing against a shoulder on its shaft.Sounds like the pump shaft is floating, so giving variable pressures. The thrust bearing should be positioned to take the back thrust of the impeller while allowing heat expansion along the shaft. Offshore...
  12. chief

    power turbine lubrication system failure during start up

    Check the rotation direction of your oil pumps and motor amps as a preliminary, before the obvious suction and discharge strainers and possible jammed relief valves Offshore Engineering&Design
  13. chief

    Best pump(s) to bring water uphill (700 meters altitude)?

    Have a look at this Hydra-ram, using gravity water power to lift your water, no other power needed. http://www.allspeeds.co.uk/hydraulic-ram-pump/ Offshore Engineering&Design
  14. chief

    Estuary water massive corrosion rate

    Fit sacrificial ZINC ANODES to your manifold exteriors. Offshore Engineering&Design
  15. chief

    Piston broken in half(top-bottom)

    i have experienced this problem. Root cause was casting sand which had congealed and remained in the piston internally. Worked loose and cause grinding effect on liner , eventually seizing piston on TDC and separating at gudgeon pin area. Offshore Engineering&Design
  16. chief

    Exhaust Gas Casing deformation (rotor sagging)

    Ensure the flexible bellows on your exhaust has free movement,otherwise you will have shaft and bearing problems caused by rigidity. Look under the inlet AND EXHAUST insulation blankets.Many installation sins are hidden and cause surprise problems. Offshore Engineering&Design
  17. chief

    VESSEL SIZING - RETENTION TIME

    Rule of thumb for discharge pressure approx. 125psi. Max Flow rate of compressor/s in CFM = Volume of air receiver in gallons. This volume allows for dwell time and prevents rapid cyling of comressor. Offshore Engineering&Design
  18. chief

    steam ejector problems

    The check valve is usually at the first stage suction manifold, this prevents 'leak back' and maintains the vacuum. Offshore Engineering&Design
  19. chief

    steam ejector problems

    http://www.uniquesystems.com/pvs/brochures/Bulletin_PVS-80025121-ESM_-_Ejector_Maintenance.pdf You may some pointers here,would appear you may have worn ejectors. Offshore Engineering&Design
  20. chief

    steam ejector problems

    Have you considered a check valve on the final ejector stage. This is common on Steam turbine plants, and a problem with low vacuum can be traced to a faulty check. Offshore Engineering&Design

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