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  • Users: irishal
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  1. irishal

    Plastic / GRP Piping material for sea water duty.

    Hi, Can anyone recommend what material to use for pipework carrying seawater? I was considering going to a glass fibre reinforced plastic system. Is there a recommended plastic to use? Pipe sizes range from 10inch to 20 inch. Pressure is only a few bar. Our existing piping is internally painted...
  2. irishal

    Natural Gas Isolation Ball Valves

    Hi, I am looking for recommendations for ball valves for isolation of natural gas fuel supply to our power station in the UK. Sizes range from 8inch to 12 inch ASA 300. Our existing valves are PTFE seated and have suffered from scoring due to dirt in the pipeline. Even the valves downstream of...
  3. irishal

    Elin Generator

    Hi, Does anyone have an Elin (Austria) 9A5 Type generator at their plant? We have a 140MW generator but must carry out brushgear replacement every 6 weeks which has to be done with the machine on turning gear. We want to upgrade to allow us to do the brushgear change onload. Elin have proposed...
  4. irishal

    Easy one....tolerances..

    What does Ø160c7 mean on a shaft diameter. It is a clearance fit. Unfortunately I don't have a limits and fits table and the ones if found on the web don;t have c7.
  5. irishal

    Odour problem

    I look after the maintenance of a HVAC system for an office block. We have a neighbouring business (meat processor) that a certain times of the day lets out an awful odour. Our HVAC system sucks in the the odour and stinks out the building. It is that bad that some people have almost hurled at...
  6. irishal

    Urgent - P91 Eccentric reducer required

    Hi, I need some help to source a pipe fitting for my power station. If someone has one or can give me details of good reputable suppliers please. We would be willing to buy or replace it as soon as my usual supplier delivers to us (he is currently quoting 4 weeks!). The fitting needed is:-...
  7. irishal

    Beaudrey Bandscreens - Help

    Hi, We have 6 Beaudrey bandscreens filtering sea water on the cooling water intake to our power station. We are having problems with debris getting past the screens. We have checked all the obvious and not so obvious points:- - Screen tension - Side clearances - Damaged panels - ete. Beaudrey...
  8. irishal

    Documentation

    Hi, My UK based company owns/operates a liquid CO2 system for fire fighting purposes. MAOP is 22 Barg. The liquid CO2 is distributed by various sizes of pipes the largest being 100mm to the different areas. We have no technical documentation on the pipework - no material certs, welding records...
  9. irishal

    Copper tube bend failure

    Hello, Need some help finding the cause of a failure of a copper tube bend on a small HVAC split unit. The 6mm copper pipe carries R422 refrigerant and has failed at least 3 times now on the inside of the bend. The bend was made using a pipe bender. The failure appears to be a pin hole failure...
  10. irishal

    Training on Maintenance of Natural Gas Piping Systems

    Hi, Does anyone know of any requirement in the UK for pipefitters / maintenance personnel to have formal training to work on onshore industrial natural gas pipework installations? We employ qualified and competent fitters to work on our power station and they are required at times to work on...
  11. irishal

    White dust inside generator

    Hi, We recently opened up our generator (150MW, air cooled) to inspect for oil leaks and a general look. This is the first time I have been involved in this inspection but I noticed a thin film of white dust lying on the tops of strengthening bars and other surfaces. I am pretty sure it is...
  12. irishal

    Turbine Lub oil particle count

    Hi, We have a 150MW steam turbine with associated lub oil system. We recently suffered a major bearing failure, the root cause is still not clear, however we suspect foreign object damage to the bearing from lub oil contamination. The turbine was repaired and the complete oil system including...
  13. irishal

    Inspection of Distillate / Diesel Storage Tanks

    I have two relatively new 9500 tonne diesel storage tanks on my site - they are fixed roof, internally supported carbon steel, designed to BS 2654, and have an internal coating over the floor and up the wall for 2 metres. I would like to know what is good industry practice with regards to...
  14. irishal

    Inspection of on site buried natural gas pipeline

    Hi, We operate and maintain a new gas fueled power station in the UK. We have a short section, approx 800 metres, of buried 450mm (18") natural gas pipeline. The gas is at 40 Bar. The line is internally and externally coated and has a sacrificial anode cathodic protectiom (CP) system. What I...
  15. irishal

    Liquid CO2 storage

    I store liquid CO2 at 20 Barg on my site. This is a new installation designed and constructed to European standards. The vessel is rated to 22 Barg and -40oC to +45oC. We have pressure relief valves set at 22 Barg. My question is:- Is -40oC an acceptable design temperature? There is old UK HSE...
  16. irishal

    Ignition sources on gas power plant

    Not sure if this is the correct forum but here goes anyway. We are about to take over the management, operation and maintenance of a new gas and distillate fuelled power station. What are peoples experiences of the control of ignition sources on power plants? I have been on chemical plants and...
  17. irishal

    Kerosene (Jet) vaporising

    Hi, We have a problem on our site where we are pumping Jet aviation fuel from underground tanks into a pipeline. Over a short period of time the pump performance drops significantly until eventually is loses all discharge pressure. The pump, a vertical can pump, then needs to be vented and is...
  18. irishal

    25CrMo4 Nuts and Bolts

    Hi, Does anyone know whether 25CrMo4 Nuts and Bolts are relatively easy to get hold of in the UK? My fastner supplier tells me he has not heard of this grade. Thanks

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