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pressure

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.: 445  Gauge pressure (also spelled gage pressure) is the pressure relative to the ambient pressure.
Various units are used to express pressure. Some of these derive from a unit of force divided by a unit of area; the SI unit of pressure, the pascal (Pa), for example, is one newton per square metre (N/m2); similarly, the pound-force per square inch (psi) is the traditional unit of pressure in the imperial and U.S. customary systems. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere (atm) is equal to this pressure, and the torr is defined as 1⁄760 of this. Manometric units such as the centimetre of water, millimetre of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.

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  1. I

    Commercial high pressure system, will hep couplings be stong enought?

    I am having to work on a concealed shower but there is no service valve and so I am having to isolate from a large mixing valve which is linked to several other showers. I am going to add a service valve to make it easier for future maintenance but the pipe connected to the shower is 15mm...
  2. M

    sudden pressure drop on boiler

    hi im new to this so thought i’d come on and ask if anyone came across same problem.. done a boiler 2 years ago (vaillant system boiler) and its been fine whole time, lately his pressure been dropping, tops it up and lasts 4 or 5 days then drops from 1.7bar ish to 0.0bar. not a gradual drop so...
  3. A

    What amount of water pressure comes through a normal house ?

    Every time I use a stop end when I turn the water back on I think to my self that’s going to pop off and flood the house. What amount of pressure can they with stand ?
  4. B

    pressure very high. all radiators on even when trvs closed.

    hi all some advice combi boiler is heating water and heating comes on fine. its an ecotec plus - vaillant Issue - Pressure is way to high, sits at 3.3 and goes right up to 3.7 when on. im worried something bad will happen soon. im not sure when it started, but been like this for a month or...
  5. A

    Pressure below 1 bar in morning when water heating comes on

    Got baxi 800 5 months ago with new water tank and expansion vessal which is opposite water tank. After heating off all night and water heating comes on pressure too low below one bar makes noise. If put central heating on pressure goes over one and is OK. Pressure stays under 2. Have recently...
  6. I

    Problems with hot water in a pressure system

    Hi, We recently had the pressure tank replaced in our system as the old one started leaking. Since the replacement, I've seen two problems. The first is that there is a loud knock when the tap is turned on. I believe this is because there is air in the system? Secondly, when the heating is on...
  7. P

    Pressure too high in open vented system

    Hi Guys, Hopefully someone can help me out - the pressure reading on my boiler and in the hot press seems too high. Just wondering how can this be adjusted? Hot Press: Downstairs boiler: Any help would be greatly appreciated
  8. P

    CAN I REPLACE THE PRESSURE ADJUST CONTROLLER

    Hi there. First Post. I am having a problem with the pump pressure adjust electrical black box attached to the side of my Wilo Gold 50 pump. In the last few month's it has been necessary for me to use a screwdriver to move the white speed controller on top of this box in order to get the pump...
  9. D

    Mains Water Pressure Advice

    Hi all, My house is about 28 years old so some things are starting to fail with age. I changed the main water stopcock and well as the PRV as the stopcock was leaking and the pressure valve would not budge from 4 bar (even when it was disconnected). My main question is - what is the upper...
  10. D

    Why does shower pressure keep going up and down and hot and cold

    Can anyone please help. We have shower issues and have had for about 2 years. We are in a farmhouse. So before hand, we would turn on our Trevi shower, it would go warm, not great pressure through the showerhead though, somewhere between normal and dripping! After a few minutes, the water flow...
  11. S

    Unable to top up pressure on Alpha CD35C Combi Boiler

    The central heating circuit is slightly low on pressure so I tried to top it up with the built in filling loop. Nothing happens. No mains water gets pushed into the heating return pipe. I disconnected the filling loop on the heating side to test the double-check valve, and mains water comes...
  12. A

    When installing double radiator boiler pressure drops.

    When replacing 500x900 ( single) radiator with exactly the same size but double the boiler pressure drops. Is this because the radiator requires more water than the original?
  13. A

    Tap design pressure...

    Hi guys, happy new year to all. Anyone able to explain to me the cons of fitting taps designed for high pressure on a gravity fed supply? I'm currently doing my bathroom, but don't want taps designed for low pressure as I'm planning on having my cylinder swapped out in a few months and going...
  14. B

    Boiler losing pressure

    First time post so go easy, ive had an ongoing issue with my boiler loosing pressure, ive had boiker chexked over and they suggest its a fault with pipework, ive checked for ceiling staining and around all radiators however all dry and no obvious signs, weve tried fernox f4 leak sealer still to...
  15. E

    How to find a leak -low pressure boiler

    Hi we had a new boiler fitted about 6 months ago and over the past 2 weeks the boiler pressure has dropped to 0 at least 4 times. It only seems to happen during the night when the boiler has been off as we keep waking up and noticing that the boiler is off due to no pressure. It doesn't happen...
  16. J

    Valiant Ecotec Plus 938 A - Losing pressure (losing my mind!)

    Good afternoon. I am hoping someone may be able to help with an issue I have on a Valiant Ecotec Plus 938 boiler. Fitted approx 4 years ago, the boiler has been suffering from the loss of pressure on the system (down to 0) at least once a day, typically when it is not in use. I have so far; 1...
  17. R

    Constantly fluctuating pressure gauges!

    Hi there, We have a pressure gauge attached close to an underfloor heating manifold. When the normal radiator heating is on (UFH on or off, makes no difference) it rattles like crazy fluctuating in pressure. An engineer replaced the valve but it made no difference. Is there a common reason...
  18. 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...
  19. C

    ideal ff240 boiler pressure readings

    We just moved to a house with very old boiler ideal ff240, next to the boiler there is a red cylinder , I assuming it shows boiler pressure. Not sure how to read it as there are 2 needles , red and black. Could anyone help please, is this right pressure? The heating and hot water works but the...
  20. H

    Pressure loss in Heating System post fitting new Expansion Tank

    Hi, hope someone can help me with a heating pressure loss problem. My valiant boiler has been loosing pressure over the last few months, resulting in me having to top up the water every week or so. Managed to get a boiler engineer to visit who diagnosed a faulty expansion tank. (Water evident at...
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