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working pressure

For fluid power, a working fluid is a gas or liquid that primarily transfers force, motion, or mechanical energy. In hydraulics, water or hydraulic fluid transfers force between hydraulic components such as hydraulic pumps, hydraulic cylinders, and hydraulic motors that are assembled into hydraulic machinery, hydraulic drive systems, etc. In pneumatics, the working fluid is air or another gas which transfers force between pneumatic components such as compressors, vacuum pumps, pneumatic cylinders, and pneumatic motors. In pneumatic systems, the working gas also stores energy because it is compressible. (Gases also heat up as they are compressed and cool as they expand; this incidental heat pump is rarely exploited.) (Some gases also condense into liquids as they are compressed and boil as pressure is reduced.)
For passive heat transfer, a working fluid is a gas or liquid, usually called a coolant or heat transfer fluid, that primarily transfers heat into or out of a region of interest by conduction, convection, and/or forced convection (pumped liquid cooling, air cooling, etc.).
The working fluid of a heat engine or heat pump is a gas or liquid, usually called a refrigerant, coolant, or working gas, that primarily converts thermal energy (temperature change) into mechanical energy (or vice versa) by phase change and/or heat of compression and expansion. Examples using phase change include water↔steam in steam engines, and chlorofluorocarbons in most vapor-compression refrigeration and air conditioning systems. Examples without phase change include air or hydrogen in hot air engines such as the Stirling engine, air or gases in gas-cycle heat pumps, etc. (Some heat pumps and heat engines use "working solids", such as rubber bands, for elastocaloric refrigeration or thermoelastic cooling and nickel titanium in a prototype heat engine.)
Working fluids other than air or water are necessarily recirculated in a loop. Some hydraulic and passive heat-transfer systems are open to the water supply and/or atmosphere, sometimes through breather filters. Heat engines, heat pumps, and systems using volatile liquids or special gases are usually sealed behind relief valves.

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  1. eagleeye

    Viessmann min gas working pressure

    Can anybody tell me what the minimum gas working pressure is on the Viessmann 100-W 35kW combi. Going by what it says in the MI's it can be between 10-34mb. Or am I reading this wrong ? See attached from MI's.
  2. K

    Working pressure effecting combustion.

    Ok so I called gassafe today to check hoe to clasify low working pressure and was told if it's not effecting combustion then just note it as a fault (ncs) if it is then it's AR. I've always worked on the principle that when it's close to 14mb or below I'd put it AR and if it was badly effecting...
  3. Jock Spanners

    Ideal Logic Combi - Low Working Pressure

    Evening all, I've been to service an Ideal Logic Combi 30 today and when I tested the working pressure at the inlet it was only 10mb on maximum rate. The WP was 20mb at the meter. The analytics were spot on and the gas rate 3m/hr. The pipework is correctly sized and there doesn't appear to be...
  4. S

    Measuring Working Pressure at the Meter

    Who, when you take a working pressure at the meter in a property with multi appliances (or boiler and cooker) record the measurement on a cp12 with all the appliances working? Or do you just have the appliance with the largest load on?
  5. P

    inlet working pressure drop between meter and boiler

    Hello everyone I wonder if anyone could help me get some answers… Last year I had a new boiler installed. Before I had an old fashion boiler (installed in the lounge) so most of the system had to be replaced. Pipes run from the meter to a junction giving one branch to a cooker and one to...
    • poodelek
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    • Replies: 20
    • Forum: Plumbing Jobs | The Job-board
  6. W

    Proper procedure for Working Pressure Test?

    Hi there, I'm doing my Gas Safe course at the moment and there seems to be some debate on the proper procedure fot working pressure tests. Some seem to think that you only have the appliance in question opporating, others think that all appliances need to be operating at the same time...
  7. P

    Low working pressure at boiler

    Hi to all, I'm a gas engineer having a bit of a nightmare on a job, we have installed 37kw boiler. We are getting 12mb working pressure at boiler and 19mb at meter. original pipe running from meter was in 22mm so I thought pipe sizing issues, we have now installed a 28mm run from meter...
  8. P

    Low working pressure at boiler !!

    Hi to all, I'm a gas engineer having a bit of a nightmare on a job, we have installed a vaillant Eco tec 837 37kw. We are getting 12mb working pressure at boiler and 19mb at meter. original pipe running from meter was in 22mm so I thought pipe sizing issues, we have now installed a 28mm...
    • Plumber Direct
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  9. B

    Working pressure low at boiler - ncs or at risk?

    Hi guys, went to a goosed combi that was running on 15mm pipe work that goes an estimated 15m. Flue had not been up in properly and wasn't seal so ID'ed it. Took a wp before I told it off and it there was 4mb drop over the installation pipe work. now if the boiler had been working ok, would...
  10. T

    Hob working pressure

    Hi all doing a landlords cert on hob in place, it's a shop put all 5 burners on and getting 24mb at meter not got the adapter to check on hob it's self I no it's 21 plus minus 2 so should I get Transco out,it goes off the meter in 22mm then into 28mm strangely for about 6 meters then back to...
  11. M

    Inley working pressure advice needed

    Hey chaps, well i have been so busy for the past month that I have not had time to come on the forum. Hope you are all as busy as I. Any way, down to business I have just installed a Vailliant 831 combi boiler. Working pressure at meter: 20mb...
  12. B

    Symptoms and problems associated with low inlet working pressure (forced draught).

    Alright? i've been wondering. we're all hell bent on getting the correct minimum inlet working pressure at appliances, all the more so it seems as many more of us tend to be more and more concerned in meeting the requirements for seemingly bigger and bigger combis in an environment of ever...
  13. D

    ideal logic/independent c 30 inlet working pressure

    i have been reading various threads about apparant pressure loss when measured on the gas valve ( underneath the boiler nr yellow lever). I have not managed to get more than 19 mb despite oversizing the gas pipes. thought that at some time i would get banged up in prison for this. Do I...
  14. D

    Working pressure.

    Hi all interested :) What are your thoughts on undersized pipework and poor supply pressure? A friend asked me to check out his mothers boiler today! Installed in 2010 under the Keep Newcastle Warm lot, the freebie given to older customers by the local authorities I believe? Boiler installed...
  15. D

    working pressure at meter

    18mbar.............at meter .....working pressure on boiler fine....is all ok....!
  16. C

    Ideal Logic - low inlet working pressure

    I have issue with the Ideal Independent 30 - rated at 33.7kw gross (30.4 nett) The working pressure at the meter is 21mbar, and at the test point on the isolation valve only 18mbar. Clearly over the 1mbar drop allowed in BS6891. The MI mentions a pressure drop between the external gas cock...
  17. M

    just over 5mb working pressure on inlet on a vaillant turbomax 282........

    ......but 21mb at meter with a pipe run of 22mm for about 5m with 4 elbows and 0.5m of 15mm into boiler!! could this be a faulty gas valve rather than a pipe sizing issue? any thoughts lads? don't think its a regulator problem as its 20mb at the meter when boiler is on.
  18. D

    Working pressure

    Happy new year ! Although in Practice working pressure is done with the appliance being worked on at full capacity, I have conflicting info regarding the correct way, as I have understood it ALL appliances are required to be on full rate as this tests appliance at worst possible...
  19. B

    Working Pressure at meter

    Fitted a Worcester greenstar 24i j for brother today. working pressure at meter was 23.5mb. it was a metric ETM meter how can i get an accurate gas rate with these meter? will the high W / P effect the H O or will the zero governer prevent this?
  20. C

    working pressure at the meter check

    Got three working pressure at the meter checks to do for my portfolio,is this just connecting your ugauge up to the meter with the appliance running? Can it be any appliance? I started to confuse myself and think maybe i got to find a appliance that hasnt got a test nipple on the appliance,any...
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