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A convention is a set of agreed, stipulated, or generally accepted standards, norms, social norms, or criteria, often taking the form of a custom.
In a social context, a convention may retain the character of an "unwritten law" of custom (for example, the manner in which people greet each other, such as by shaking each other's hands). Certain types of rules or customs may become law and sometimes they may be further codified to formalize or enforce the convention (for example, laws that define on which side of the road vehicles must be driven).
In physical sciences, numerical values (such as constants, quantities, or scales of measurement) are called conventional if they do not represent a measured property of nature, but originate in a convention, for example an average of many measurements, agreed between the scientists working with these values.

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  1. N

    How deeply are plastic central heating pipes usually under screed

    Despite powerflush new lockshields,and trv's still one rad not heating.I took it off and checked flow and return.Good from return but just a drip from flow end.I feel it is blocked underfloor plastic pipe.Just wondered how deep they are usually laid.-house approx 20yrs old appreciate any rough...
  2. B

    Industrial or domestic plumbing?!?!?

    Hi everybody, Chris here. Im 28 and working in an office. Absolutely hate it and I've decided to go an get an apprenticeship. Long story short, 2 companies have offered me a labouring job for the summer and an apprenticeship contract. One company is an industrial plumbing company. They...
  3. J

    Changing TRV's

    Hi Guys Bit new to all this but was hoping for a bit of help/advice please? Whats the best procedure for changing TRVs like drain down, time & cost and do you use aids, like freezer packs or 'Aquavac' or similar? Any help would be great :)
  4. 1

    Mains water supply.

    Hello Members, The stopcock at the bottom of the yard. This is the water supply from the water board. My side of the stopcock ~ what size is the pipe? Using 32mm MDPE, and if the size from the stopcock is 15mm,I will need 32mmx15mm(example)? Is the size from an old stopcock usually 15mm...
  5. Super Mario

    What spanners/grips you use for chrome rad valves

    My bahcos slippin and grips chewing the body what you use?
  6. F

    Washer waste fixing

    I'm a complete novice when it comes to plumbing so bear with me. I recently moved house and I am trying to connect the waste pipe from the washer under my sink but apparently I needed a part called a 'long nose spigot?' Anyway after looking around for this part I think I found what I need...
  7. Robert Tyrrell

    OFTEC re- inspection

    This is probably a daft post but I've got a re-inspection this Thursday. I started back up with them 3 years ago - how time flies :) The thing is that I can't remember what it is they need to see at the inspection, other than going through the service/installation/commissioning etc. Do I need...
  8. B

    A Few Questions Re. Radiators, Bathroom and Kitchen!

    Hi all - new to this forum but have used and contributed to other forums for different reasons for years. So I know forums are usually great places to seek advice. Rather than post several different questions I thought I'd combine them here. I'm moving into a new house and the trouble and...
    • Birmingham
    • Thread
    • bathroom clean kitchen machine questions radiator radiators suite usually
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
  9. T

    Radiator valve drain washer ?

    My radiators downstairs all have drain points so I can empty and remove them when decorating etc. They are slightly unusual. The radiator tail has a small drain outlet with a threaded end fitted with a small cap with a rubber washer/disc in the bottom. To drain the rad, you unscrew the cap...
  10. D

    Ideal isar pump head gasket/seal

    Evening all, been to yet another leaking Ideal Isar 24, pump head gasket/seal. Tried resealing but to no avail. Is this available as a stand alone spare part or as part of a kit? Many thanks.
  11. M

    disabled toilet measurments

    hi, for a low level disabled toilet it says. " WC distance from back wall [front 750mm from back wall) " Does that mean the font lip at the top of the toilet around the bowl, or the front lip around the base of the toilet?
  12. Ted808

    Quotatispro

    Hi there has anyone used this latest gang of 'pay- as -you - go- lead' generators...? It seems too good to be true, no subscription, you choose the area, the amount of leads and well, like all the others you never guaranteed to get the lead you paid £20+vat for but ... maybe worth the chance...
  13. G

    105HE Boiler problem

    Hello all, I need some advice regarding a 5yr old Potterton 105HE boiler that's fitted with a Horstmann digital wireless thermostatic controller. Yesterday my wife noticed that the heating wan't engaging when the controlled requested it to be. To the best of my knowledge the heating hasn't...
  14. T

    Towel Radiator Tappings

    Does anyone else frequently get problems with the 1/2" Tappings on towel radiators. 90% of the ones I have seen are dog rough, usually a really slack thread, and often leak no matter how much jointing compound you put on. I generally just use PTFE or loctite on the valve tails, is there...
  15. D

    Propane

    What are you guys paying for your propane bottles?? A 455 gram cylinder is £7.20 at Go Outdoors.
  16. K

    Help please re thermal store cylinder

    Hi I am thinking of doing away with my cylinder and 3 bar pump and replacing it with a mains fed thermal thermal store system. My mains pressure is usually 2 bar (but can fall to 1.5) and my flow is approx 18 litres pm. I live in a 2 shower room apartment, there s usually just the two of us...
    • Klythawk1946
    • Thread
    • cylinder help litres mains please shower store thermal thermal store usually
    • Replies: 1
    • Forum: Plumbing Jobs | The Job-board
  17. W

    Recommendations for cheap core drill, infrequent use, usually 40mm max

    Not so cheap it will be hard work but not overkill for couple uses a month for 40mm holes. I've tried to core a few 40mm holes with this Bosch GBH 2400 2kg SDS Plus Hammer Drill 240V | NoLinkingToThis And it works but keeps locking so guess not what it's meant for. Or it's on it's way out. Or I...
  18. J

    gravity fed system queries.

    Hi, I was called to a customers premises today to quote for a replacement boiler and upgrade of system. The customer has a back boiler (baxi bermuda) and i believe it is fed by gravity.I am not familiar with this type of system so i just wanted to check are gravity systems usually one pipe...
  19. P

    Please help, I can't find the data plate on my gas fire and don't know the make!

    I am having some cavity wall and loft insulation fitted just after Xmas by British gas but before they start work they need to see the manufacturers instructions for my gas fire, I have looked for the data plate but can't find it, could it be on the back of the fire? Any help would be very much...
    • PlumberJade
    • Thread
    • can't could find gas gas fire help insulation plate please usually
    • Replies: 9
    • Forum: Plumbing Jobs | The Job-board
  20. F

    Ideal Classic fault

    Got called out to look at a boiler that is cutting out intermittently, the boiler always comes on in the morning and is usually set for 18 c in daytime. The problem usually occurs when the customer is calling for more heat at nighttime as they turn it up to 21 c but then the boiler cuts out and...
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