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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. M

    Bolier pressure - Central ceating issue

    Hi, I noticed the pressure this morning on my boiler was just below 1bar so I went to top it up, opened the loop and it just managed to hit over 1bar then just stopped increasing. Now the central heating looks like its on but all the radiators are luke warm even when temperature is 70 degress...
  2. G

    Under sink heater pressure

    Hello, First time posting here, I'm looking for some advice. Apologies in advance if I ask silly questions. I'm English but recently moved to Germany. We are living in the house of my girlfriend's late father. He was something of a dysfunctional alcoholic and the house is full of quirks and...
    • georgerarnold
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    • Replies: 2
    • Forum: USA
  3. J

    Vaillant 637 with pressure issues

    Hi there, I've recently started having pressure problems with my Vaillant Ecotec Pro 637 System boiler. When the system has been off for a while (and the water in the system has cooled) the pressure is often really low (certainly less than the min 1bar for the boiler to fire and often...
  4. Pgor68

    Combi boiler pressure at 3bar

    Hi all. I have recently drained system, removed all rads and manually flushed them all. Filled system back up, bled all rads and repressurised the system to between 1 and 1.5 bar. The system was off all night waiting for the timer to kick in and when I checked in the morning, before it came on...
  5. F

    WHY IS MY HOT WATER PRESSURE SO LOW

    ON MONDAY THIS WEEK 14/02/22 MY IMMERSION HEATER WAS REPLACED,BUT SINCE THEN MY HOT WATER PRESSURE IS VIRTUALLY NON EXSISTANT. I CONTACTED THE PLUMBER TO COME BACK ONLY TO FIND OUT HE WAS AT THE AIRPORT WAITING FOR HIS HOLIDAY FLIGHT {JUST MY LUCK} ANY IDEA WHAT COULD HAVE HAPPENED,I CAN'T...
    • falconner
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    • Replies: 5
    • Forum: USA
  6. Aaron Knight

    Boiler losing pressure

    Hi, I own a Valient ecoTec boiler combi boiler which is located in the loft. I am losing water pressure daily but am at loss as to what is causing it. During the day, when I pressurise my system to 1.5 bars, it runs for 8 hours before losing, any pressure. In the evening, once I pressurise...
    • Aaron Knight
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    • Replies: 4
    • Forum: USA
  7. I

    Low cold water pressure after vented boiler replacement

    Hello, I have a had a gravity boiler replaced from a Potterton 80e to a more recent Valliant ecoplus boiler. The cold water tank is in the loft space directly above the 1st floor bathroom and the hot water copper immersion tank is in the 1st floor bathroom cupboard space. A fairly normal...
    • intamixx
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  8. Grahampowell22

    Hot water pressure dropped on two outlets only (mega flow)

    Hi. We’ve a pressurized megaflow system and the last few weeks we’ve lost water pressure on Just two outlets in the house. The first a Keuco mixer shower were the hot outlets is just a dribble where previously it filled the bath in 5 mins and the second a Quooker tap where the tank fed supply...
    • Grahampowell22
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    • Replies: 9
    • Forum: USA
  9. A

    Combi boiler pressure

    Hi I suspect I have a leak in my central heating system. Have to refill it every 3 months when the pressure drops below the operating level. Replaced prv and pressure vessel as that was faulty but still having the same problems. More than will to pay someone to come round . I’m in Orpington Kent...
  10. R

    combi boiler pressure bouncing only when hot water is being used

    Combi boiler pressure bouncing only when hot water is being used , could this be the diverter valve diaphragm..... cheers Rob
    • robqqq
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    • Replies: 7
    • Forum: USA
  11. Riley

    Minimum flow and pressure expected

    Evening chaps, I realise that different parts of the country will differ in terms of pressure and flow in coming but is anybody else noticing a trend that guaranteed litres per minute is coming down and down as confirmed by providers? I have two recent quotes both large family houses where...
    • Riley
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    • Replies: 5
    • Forum: USA
  12. W

    Dropping pressure gauge

    I’ve looked through the answers but I’ve not seen a solution to my problem. My pressure gauge drops overnight 1.75 bar to zero. No visible leaks any where …valves..connections pressure release valves etc. All radiators heating correctly and no air in rads. Circulation pump has no sounds of...
  13. C

    Pressure issues or controls?

    I have a worcester Bosch greenstar CDI compact that’s around 6 years old. Over the last few months I’ve noticed the pressure when the heating isn’t on drops to 0 and if I flick the Salus control on the boiler to on nothing happens and the boiler light stays off. What I have since worked out is...
  14. Bettyboo

    shower valves and change of water pressure?

    Hi All Thames Water recently came to fit an outside water meter and since then I have had two 1901 bristan shower cartridge/ valves dripping . Is it possible this was the cause ? When I did up the house I had a 25mm MDPE main water pipe fitted between the external stopcock to a new internal...
    • Bettyboo
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    • Replies: 1
    • Forum: USA
  15. C

    Expansion Vessel Pressure

    Hi, Should an expansion vessel pressure match the pressurisation unit? For example, if the pressurisation unit is set at 1.2 bar should the expansion vessel be set at 1.2? Many thanks
    • CarlJa
    • Thread
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    • Forum: USA
  16. Bogart

    Mixer tap pressure low

    Never gave it a thought, regarding pressure suitability, when the boss said " Oh I like that tap". Hence stuck with a tap specified as minimum pressure 0.75bar and me with a gravity system at max height 5m, ie 0.5 bar at best. So as I see it I have 2 options. Fit some sort of pump, only needs to...
  17. 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...
    • Illuminate
    • Thread
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    • Replies: 9
    • Forum: USA
  18. 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...
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