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Recent content by MickMcC

  1. MickMcC

    External Gear Pump

    Thanks TugboatEng
  2. MickMcC

    External Gear Pump

    Thanks for your help littleInch, that's an interesting observation regarding the hand pump. The fuel delivery system has a pressure reducing valve that is notorious for causing problems so it has been bypassed. Hence the 1.3 bar instead of 0.4. I'll keep researching and see if some of the flow...
  3. MickMcC

    External Gear Pump

    Thanks for the replies. A fuel oil ring main is supplying the pump intake. The ring main is fed by a boost pump. I will try to find out the discharge pressure from the manufacturer.
  4. MickMcC

    External Gear Pump

    Yes, didn't get any joy so trying to ask in a different way. Engine is discharge side. Don't know what the discharge pressure is. Don't have a pump curve, I think there is a pressure relief system outside the pump. Haven't contacted the pump vendor. Than you for the reply.
  5. MickMcC

    External Gear Pump

    Hi everyone, Let's say I have an external gear pump driven by the camshaft of a marine diesel engine. The nominal speed of the engine is 1800 rpm and the capacity of the pump at nominal speed is 8 L/min. Diesel fuel is supplied to the gear pump suction at 0.4 bar g pressure via a 15 mm pipe...
  6. MickMcC

    Marine Diesel Gear Pump

    Hi TugboatEng, cutting the fuel lines was not an option.https://files.engineering.com/getfile.aspx?folder=21528fff-7d6f-43dd-ac0d-812e91d4ede9&file=Doc2.pdf
  7. MickMcC

    Marine Diesel Gear Pump

    Here's doc.2https://files.engineering.com/getfile.aspx?folder=21528fff-7d6f-43dd-ac0d-812e91d4ede9&file=Doc2.pdf
  8. MickMcC

    Marine Diesel Gear Pump

    Hi LittleInch, here are a couple a sketches that may help. In doc.2 FM is the approximate position of the flowmeters ahttps://www.eng-tips.com/viewthread.cfm?qid=473109nd the numbers are pipe diameters in mm. I only seem to be able to uplaod one file at a time. I'll upload doc.2 in a separate...
  9. MickMcC

    Marine Diesel Gear Pump

    I am using Flexim ADM 7407 flowmeters. the specs are here: https://www.insatech.com/downloads/UMFLUXUS_F7V4-0-2EN.pdf. It is unlikely there are bubbles in the line and the flowmeter transducers are on a long straight length of pipe. Return line flows are around 5.5 Lpm.
  10. MickMcC

    Marine Diesel Gear Pump

    Hi btrueblood, thanks very much for your input. The pipes are 15 mm (3/4 in) ID. I think the flow velocity is around 1.5 m/s.
  11. MickMcC

    Marine Diesel Gear Pump

    Thanks for the reply LittleInch. I'll try to sketch something up later. Originally I thought this was a meter issue but I have flowmeters on seven engines on three ships and they are acting in the same way. If the supply flow rate is around 8 L/min or below I get expected results. When the...
  12. MickMcC

    Marine Diesel Gear Pump

    I have an ultrasonic flowmeter on the supply fuel line measuring volumetric flow rate to a MWM marine diesel generator engine. I also have an equivalent flowmeter on the return fuel line. The capacity at nominal engine speed of 1800 rpm is 8 l/min. The supply line is branched off the fuel supply...
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