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bar pressure

The split-Hopkinson pressure bar, named after Bertram Hopkinson, sometimes also called a Kolsky bar, is an apparatus for testing the dynamic stress–strain response of materials.

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  1. T

    Relieve boiler pressure

    Hi, The pressure was n my boiler is just under 3 bars, how do I drop it down? Many thanks Tom
  2. W

    Pressure loss from sealed system stops when open/closing a zone with 'a leak'

    Hello all, Seeking any input on a matter that seems to defy logic and common sense. Sealed system Oil fired boiler (newish) feeding a large farmhouse from an annex with a good quality install/ pump etc that seems to be doing the job. The system is losing 1 bar per day for a long time. I...
    • woodstock1968
    • Thread
    • bar pressure forum leak oil boiler plumbing pressure pressure loss sealed sealed system stops system zone
    • Replies: 1
    • Forum: Plumbing Zone
  3. J

    Worcester 28Si II, system bar pressure going very high.

    I would be very grateful if someone can give me some advice on the following. I have a Worcester 28Si II combi boiler in the house where I live, the hot water side is working fine, however I have an issue on the radiator heading side. When the heating is on the bar pressure is going very...
  4. S

    Megaflow 3 bar pressure reducing valve placement

    Hi, Have lived in our house for around 10 years and always had bad pressure if more than one tap is running, toilet is flushed etc(hot and cold). We have (what I believe to be) a mains pressure system with a non vented Megaflow cylinder. We are about to install a new thermostatic shower and...
  5. Super Mario

    Vailaint eco tech plus 4 bar pressure

    I've got 4 bar on the digital display but when I've let some pressure out f75 kicks in low water sensor this is at 3 bar anyone know why this is maybe need a new sensor?
  6. S

    3 Bar Pressure Reducing Valve - Knocking

    Hello - first up I am not a plumber, so am hoping that my problem is one of those really easy things to sort out if I was! The 3 bar pressure reducing valve fitted to the cold water inlet pipe to my Heatrae Sandia Megaflow in the airring cupboard has just started to make a thumping or...
    • Spud
    • Thread
    • bar bar pressure knocking pressure pressure reducing valve reducing valve
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
  7. B

    New combi boiler installed - loses 1.2 Bar pressure per day

    Hi all, I had a new combi boiler installed by a gas-safe registered engineer. We moved the position of the boiler so this required new pipes be laid - and so the floor was dug up, new pipes put in, and then everything was filled with concrete again. So a relatively major operation. The...
    • brompcarlisle
    • Thread
    • bar bar pressure boiler combi combi boiler installed oil pressure
    • Replies: 13
    • Forum: Plumbing Jobs | The Job-board
  8. A

    Easy Question: BAR Pressure issues....

    Newbie Simple Question - BAR Pressure Hi, I have a very simple question. I can't turn my Radiator Thermostat on my Boiler above 2, otherwise my BAR Pressure needle goes into the Red. How do I correct this? My own theory is too release some water out of the Radiators. Just want to check...
  9. P

    Dripping 3 bar pressure relief valve

    I am new to forums, but have a problem that I can't solve. First of all I am a qualified plumber including unvented systems. My 3bar pressure valve has been dripping for a few weeks now. I changed it for a new one thinking seal had gone or bit of crap has got stuck but the new one also drips...
    • pwplumbing
    • Thread
    • bar bar pressure dripping pressure pressure relief valve relief valve
    • Replies: 12
    • Forum: Plumbing Jobs | The Job-board
  10. K

    loss of bar pressure in two days - no leak anywhere. Logic 30 Boiler

    Hi I'm at a loss as to what the problem could be with my Logic 30 boiler. I've had a problem which has the bar pressure dropping to zero within 2 days. I've had the floorboards up and been crawling under the floor to check all pipework which shows no signs of leaking. The radiators have been...
    • kx07fdp
    • Thread
    • anywhere bar bar pressure boiler leak logic oil pressure problem water
    • Replies: 17
    • Forum: Plumbing Jobs | The Job-board
  11. C

    Worcester Greenstar 28i - CH and HW fine - 0 bar pressure?

    I repressurised the system before Christmas and saw only today the pressure had dropped down to 0 bar, however both hot water and CH seem fine. I checked the towel radiator and it seems to be the culprit as only the bottom half was hot, so bled this one and repressurised the system. Could this...
  12. R

    Bar pressure

    Hello everyone I have got a Vaillant turbomax combi boiler, Its a good 12 years old and i have just noticed that when the heating is on the bar pressure goes right off the scale. When the boiler is left off overnight the bar pressure is at 1.5 which i think is about right. With the pressure...
  13. B

    Unvented system with 2.5 bar pressure when cold

    Hi I have an unvented system (Santon cylinder) & noticed that the pressure when cold is over 2.5 bar. The hot water is also extremely hot. Are the 2 related & can I reduce the pressure by bleeding the radiators? Any advice appreciated.
  14. K

    4 bar pressure. Should I turn it on?!!

    I had an issue with frozen pipes for the CH the last few days. Repaired a burst outside pipe and re-insulated it which seems to have thawed the freeze. However the pressure gauge on my boiler which normally reads just under 1 bar is now at it's max, 4 bar!!! Should I turn on the CH with the...
  15. K

    "Explosion ignition" and high bar pressure during use. Saunier Duval System 400

    System Saunier Duval System 400 (25 year old combi boiler) Boiler has been making a loud thudding whoosh sound which rattles the case when firing back up during normal use. I think they call it "explosive ignition" The Boiler was serviced by British Gas a few days ago. He told me this was...
    • kinlungchan
    • Thread
    • bar bar pressure boiler boilers british gas combi combi boiler during expansion expansion vessel filling loop gas google high ignition internet noise pressure problem radiators rattling saunier system valve vessel
    • Replies: 13
    • Forum: Plumbing Jobs | The Job-board
  16. S

    baxi 105e 3 bar pressure problem

    hi all i was told i would be back with a problem about a month ago i was advised the ex vessel (which is charged to 1 bar) was knackered so fitted an external one t into the return pipe everything was running fine until i checked the pressure level then i topped it up to 1 bar then ran the ch...
    • seanmfc
    • Thread
    • air bar bar pressure baxi boiler central heating system cold expansion expansion vessel filling loop fitting hot no water pipe pressure pressure problem pressurised problem pump system valve vessel water
    • Replies: 22
    • Forum: Plumbing Jobs | The Job-board
  17. B

    Flow rate, 2 bar pressure, 22mm pipe

    As a rough guide can anyone tell me what flow rate I can expect from a 30 metre service pipe 22mm in diametre with 2 bar pressure?
    • Burga007
    • Thread
    • 22mm bar bar pressure bath copper flow flow rate guide lead pipe pressure valves
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  18. M

    new(ish) combi boiler at 0 bar pressure

    We had a brand new central heating system installed with a combi boiler (worcester bosch) installed just over a year ago. It was working perfectly. And then we had some building work done which involved moving one of the radiators to a different wall. After the radiator was moved, I...
    • mamaleelee
    • Thread
    • bar bar pressure bleed bleeding boiler building central heating system combi combi boiler filling loop insurance leak oil pipe plumber pressure problem radiator radiators sealed system tap vent work
    • Replies: 13
    • Forum: Plumbing Jobs | The Job-board
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