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In thermodynamics, the reduced properties of a fluid are a set of state variables scaled by the fluid's state properties at its critical point. These dimensionless thermodynamic coordinates, taken together with a substance's compressibility factor, provide the basis for the simplest form of the theorem of corresponding states.Reduced properties are also used to define the Peng–Robinson equation of state, a model designed to provide reasonable accuracy near the critical point. They are also used to critical exponents, which describe the behaviour of physical quantities near continuous phase transitions.

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  1. E

    Can this Boiler Flue be reduced in size?

    Hello All, I was hoping you could help with a potential boiler build query for my father. He has recently had a new boiler installed via British Gas (valiant brand). The external boiler flue seems excessively tall, proving to be somewhat of an eye sore (please see pictures attached). I know it...
  2. P

    Reduced Water pressure on forward bowl set

    Hi All, I replaced my existing washbasin bowl set with new Shaw and Mason forward bowl set spindles and chrome handles. The water pressure has reduced tremendously. when I opened the tap and tried running water directly it comes with full pressure. Also, if I open the spindle from the basin it...
  3. P

    Water pressure is reduced with a new forward bowl set.

    Hi All, I have replaced my existing Shaw and Mason chrome set with the Shaw and Mason forward bowl spindles/ Handles. I have kept the same tap or the water dispensing unit. The water pressure has reduced after I made the changes. I installed the original spindle back but same low pressure. If I...
  4. A

    Water pressure reduced when other appliances are on

    Hi all - hoping to get some advice here on a plumbing issue in our house. When we are showering / filling the bath and another appliance draws water (toilet cistern filling after flushing, tap being turned on or washing machine filling etc), the water pressure / flow to the other appliance...
  5. A

    Replacement shower valve reduced water pressure -need to replace again

    Hi we had a Thermostatic Aqualisa shower valve upstairs that was tank fed upstairs in our house and it had great water pressure. We recently had our shower completely redone and the valve the plumber put in doesn't seem to be very good and the water now has very low pressure. We know the...
    • Alicia
    • Thread
    • again america pressure reduced replace replacement shower shower valve usa valve water water pressure
    • Replies: 6
    • Forum: USA
  6. Dan

    Forum Subscription Price Reduced...

    Forum Subscription Price Reduced, and thanks to those that have subscribed we've been able to get the 'reactions' (likes) system earlier than we expected. :) There will be a fine balance between getting a bit of cash in for add-ons for the forum, and setting a price too high and nobody...
  7. W

    Unvented confusions. Help a brother out.

    I recently changed some taps on a system with a megaflo unvented cylinder (taps were ground floor kitchen, megaflo first floor airing cupboard in case relevant.) The pressure at the bath taps before starting was insane. Terrifyingly forceful. He whacked them on full to show me that it caused...
  8. M

    Mains water flow reduced - found this in pipe.

    My mains water flow dropped off the other week. No leaks, pressure good. Elbow fitting from Toby copper pipe to plastic pipe just inside my garden. Turns out there was a piece of plastic in my pipe, couldn't go any further into my pipe so plumber was able to pull it out after opening fitting...
  9. GQuigley67

    Unvented cylinder reduced flow rate

    When you first open a tap pressure and flow rate is good, it then dies down like a combi would reducing from approx 20 l/min to about 10 l/m. Balanced cold doesn't have this issue, expansion vessel replaced due to being burst, couldn't clean filter in combination valve so temporary bypassed it...
  10. M

    Stub stack to be reduced in height

    hi I have so many different answers on this. Upstairs ensuite toilet has a stub stack abou 20 inches higher than the toilet cistern in the corner. It not vented through to the ceiling in the bathroom it's half way up and been tiled. The soilstack goes straight down inside the house via false...
  11. M

    reducing down for soil vent

    With an internal stack that needs venting through the roof, it is usual to reduce down after the last 4inch branch in the pipe that goes in an upstairs toilet. What size do you usually reduce down to to take the soil pipe out through the roof? Think I have seen 3inch before do the readily sell...
  12. L

    mains water inlet pipe reduced from 22mm to 15mm before stopcock/water meter

    hi, please excuse any ignorance on my part that this question may throw up. my lead metal mains pipe enters the house and looks a respectable 3/4" outside diameter but within 6 inches it is reduced to 15mm copper to pass though the stopcock. this then passes through the water meter using 15mm...
  13. S

    Reduced rate of vat

    On certain energy saying products the vat rate changes. I think some items are as little as 5%. I currently get charged 20% on everything I purchase at the merchants regardless weather or not it is an energy saving item. i then charge the customer 20% vat and that goes to hmrc. just wanted to...
  14. W

    drained combibation cylinder, hot flow slighlty reduced on refill

    Tried back feeding through two different mixers. Drained and refilled again, while doing odd backfill to try and shake out at blockage. Flow is ok, just apparently slightly reduced according to owner (she seems honest) What else to try?
  15. T

    Kitchen hot water mixer tap has reduced flow

    Hello everybody, Recently my Kitchen hot water mixer tap has developed a significant drop in flow, when turned on a steady but slow trickle of water comes out whilst flowing cold but as the water becomes hotter the flow is almost a dribble, worst still is when the mixer lever is shut off then...
  16. S

    Combi with reduced water pressure

    In Italy! A Junkers combi boiler giving strange how water problems. The flow has reduced to a trickle from the shower and all 3 mixer taps - kitchen, bathroom sink and bidet (we're posh here). However if I leave any tap open on full hot and turn on one of the others mixed halfway the flow from...
  17. K

    When your reduced to this!!

    Ran out of deodorant so had to borrow the missus's Better to smell like a girl than smell like a pig!
  18. V

    Reduced pressure by using 2 combi mates in parallel?

    Hi all. New boiler and heating cylinder going in. Ive just put a blue pipe in from the OSV to the main riser in the house. I wanted to fit a combi mate but was worried about pressure being reduced. I was advised to fit 2 in parallel which would ensure there was no issue on pressure. Someone...
  19. D

    Reduced Tee measurements

    Hello, I've been fitting a heated towel rail in the bathroom, having taken out an old radiator. I'm using compression fittings. As the rail is shorter than the rad I had to run a new length of copper pipe on the return side. When I was fitting the new longer length of pipe I dislodged an old...
  20. F

    reduced water flow from shower

    Just fitted a new shower in my house, and only seem to be getting about 11 litres per min of water out of the shower, when the boiler states it should be nearer 15. I have investigated this and changed a few slightly undersized fitting from the thermostatic shower body to the shower head. Is...
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