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condensation

Condensation is the change of the state of matter from the gas phase into the liquid phase, and is the reverse of vaporization. The word most often refers to the water cycle. It can also be defined as the change in the state of water vapor to liquid water when in contact with a liquid or solid surface or cloud condensation nuclei within the atmosphere. When the transition happens from the gaseous phase into the solid phase directly, the change is called deposition.

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  1. H

    Cant find the leak!!

    I have anOil fired boiler that serves the underfloor heating system and the upstair radiator system.We recently notices thatthe expansion vessel was regestering a drop in pressure and subsequently our local plumber replaced like with like.Next day same loss of pressure.He returned and re...
  2. H

    Problem Boiler

    hi, i really dont know anything about boilers so need some DIY help. its a Selectos oil burner type 42/A basically what is happening i ran out of oil then got it in today now the boiler is not working.. when i turn it on it seems to be turning over and not kicking in.. i can hear it begin to...
  3. W

    Roof Repair

    Just been out to see a customer today with a leaky roof. I have the following secnario: At the front of the building is a foyer approx 5m x 7m with a flat roof and a timber framed glass skylight canopy in the centre. The flat roof consists of lead bays forming a rectangle with the canopy in...
  4. D

    Vokera compact 28

    Hi All Symptom : boiler locked out I reset boiler and tried to restart calling for heating sounds as though the fan is running but no ignition sequence reset and tried calling for dhw again sounds as though fan is running but still no ignition reset again and removed vacuum pipe from fan...
  5. S

    cold/hot problem

    Hello Could anyone please shed light on how in a domestic property with a new unvented cylinder fitted with no pipe crossovers would occasionally run hot water from the cold taps, I know i could fit a non return valve on the cold feed but i was just wondering why this would happen. Would be...
  6. P

    condensation on cistern

    got a toilet that gets a lot of condensation on the cistern and it suffers quite bad from it question is what is the cause of the problem and how can i cure it.
  7. R

    Lagging Pipes ?

    Hi All I am a DIYer and today I have been lagging pipes ready for the winter , can anyone tell me should gravity feed and expansion pipes be lagged ? Thanks Ray
  8. R

    pipe stats and delay off timers

    Hi everybody, I am in the process of replacing my old fired Rayburn with a solid fuel boiler stove. I will obviously need to alter the control system as there is no way to control the stove temp other than by closing dampers etc. I have used much of the existing plumbing arrangement - gravity...
  9. S

    Leak you can't find!

    I had a call about a directly heated hot water cylinder, The set up is in a retirement flat, the lady had gone away for about 4 days and got home, the carpet was a bit wet. The son went round and turned off the hot water emptied the taps but not drained the cylinder. I went round the...
  10. V

    New Condensing Combi Boiler Question

    Hi, I am getting a new condenser combi boiler fitted and have had a few quotes. As I understand it, (and I admit am not very knowledgable in these matters!), apart from the water pipes, the boiler itself needs a flue, an outlet for condensation, and an pressure outlet. The ideal position for...
  11. B

    Heat carrying capacities of cu pipe

    The heat carrying capacity of copper pipe BS EN 1057 is 15mm = 10kW with a temperature drop of 11C and a velocity of 1.5m/s. 22mm = 22.14kW It also varies with velocity the faster the more kW but usually 1.5m/s is the maximum and 0.3m/s the minimum. But at 0.3m/s its 15mm = 2kW 22mm...
  12. J

    Condensing: or not condensing?

    Hi. Ideal 'Icos HE15', I was told by a plumber of many years experience, that my boiler would not work in condensing mode unless the the rotary heat setting control was left fully clockwise (max or 5?). I have recently been told that condensing mode is operating also at any lower setting. Would...
  13. W

    position of hot/cold taps on basin/bath

    When fitting a bath or basin I have always piped the hot water to the left. Its what I was trained to do and have never been challenged on it ....until now. Customer claims that the hot should be on the right,hey the customer is always right, right? So I try to find some evidence that the cold...
  14. G

    Damp or a leak ?

    Hi all, I have recently fitted a new bathroom suite for a customer and sited the thermostatic shower on the shared wall with next door. The bathroom pre fitting was an absolute disgrace with cracked tiles, mildew and a leaking bath. 8 months later I have received a call from the customer saying...
  15. B

    concerns regarding soakaway dug for combi boiler overflow pipe

    ive just had a combi boiler fitted and a pipe runs through the kitchen wall from the boiler to outside, i presume an overflow for condensation (?), and it runs down the wall to the ground where the plumber has excavated my tarmac drive and created a small soakaway. (i) Is this the done thing...
  16. 3

    Air conditioning unit fitted. Now external Pipework looks an eyesore. How to I hide?

    Just fitted an air conditioning unit to the bedroom. (Yes the 1.5 days of sunshine prompted me to part with £250 at B&Q for one) But the external pipework is looking a bit of an eyesore... Inside I have squirted "No more big gaps" into the 80mm hole. Then re-papered. But now my outside...
  17. J

    Worcester noise

    Need advise I have 30CD Worcester conventional gas fired boiler around year old problem with boiler is fanny noise which is coming from flue! Anyone had that before, please advise! Thanks!
  18. D

    condensation on toilet cistern

    Hi folks, Any ideas on how I can stop constant heavy condensation on a toilet cistern - so much that the floor under the cistern is constantly wet. The toilet unit is a bog standard (pardon the pun) close coupled toilet, water supply off the rising main. Fairly good ventilation as the door is...
  19. J

    Dripping Central Heathing Header Tank Overflow Pipe

    A bit of an odd one this.... My wife and I don't like it hot so have set the thermostat in the hall to 16 so it is about 17 to 19 around the house. We were concerned that this wouldn't let enough heat get up to the cold water & central heating tank in the loft so I added so extra insulation...
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