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couple
In mechanics, a couple is a system of forces with a resultant (a.k.a. net or sum) moment but no resultant force.A better term is force couple or pure moment. Its effect is to create rotation without translation. In rigid body mechanics, force couples are free vectors, meaning their effects on a body are independent of the point of application.
The resultant moment of a couple is called a torque. This is not to be confused with the term torque as it is used in physics, where it is merely a synonym of moment. Instead, torque is a special case of moment. Torque has special properties that moment does not have, in particular the property of being independent of reference point, as described below.
W.B Greenstar 4000 installed.
Heating not turned on yet as not cold enough here.
But the boiler runs every day at 0933 (hear it fire and hear water in rads). Rad water runs for literally 3/4 seconds. Stops. Does it again a couple of seconds later.
Then nothing until exactly at 0933 the next...
Our builder set up the soil pipe and supply for the closed couple toilet but says it's actually impossible to connect to the wall securely (ie he says he can't get bolts in). It's silicone'd to the floor which he is claiming is fine. Is this right? There must be a way even if in means breaking...
This may be a weird question but looking for any thoughts as to what this could be.. i recently in the last few months moved my washer dryer upstairs from the basement. Its a brand new washer dryer front loader. I always leave the washer door open so this isnt the issue, but often when i wash a...
Fitted a new waste pipe and bottle trap for the new sink but unfortunately ended with a few leaks and wondering if someone could suggest solutions on how to rectify them.
One between the basin waste and the bottle trap, i guess i am needing a washer here but not sure which one to go for...
Hi all,
This is what the garage walls look like. Pictures were taken today. A couple of days ago the thick damp strip near the ceiling wasn't there, just the thin ones around the blocks, so it seems it is worsening.
The external tap was removed a couple of weeks ago as it was badly leaking and...
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couple
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Long shot I know. Anyone got the above with vertical earth pipe at the back. Tried all the usual outlets. Understand only Twyfords and Armitage Shanks did them so anyone got an AS would need the Cistern as well.
Cheers
Hi all,
I've got a British Gas 330+ Heat only boiler and it displayed an F25 error (lack of water iirc) on Sunday. I read the manual and bled the radiators (1 rad had quite a bit of air) and topped the system up a little and sure enough I could then hear water flowing back into the boiler. I...
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What is this fella? Not seen one like it before. Custard wants a PRV fitted after stopcock (pictured on pipe on right) as pressure very high and neighbours in neighbouring flats have had them fitted. Is it ok to do so? I'm guessing it's just like a modern fortic?
Apols for poor pic but it's...
Hi all
So I am part way through my Level 2 at College and have been offered a job as an Apprentice working on Site.
I need to bring with me my own basic tool kit. I have a already got a couple of bits but hadn't yet bought the majority of the stuff needed. The work I've been doing previously...
Two men rescued after their fishing boat crashed at 'notoriously dangerous' rocks - Wales Online
Don't know the details of how it happened (mechanical failure or human error)
But a massive well done and thanks to all involved in the rescue
I don't like blowing smoke up peoples arris, but these...
Ive taken apart a close couple cistern and pan to repair a leak and the close couple fixing kit has a 60mm hole for the siphon. A standard 2" kit is too small.
Im having real problems finding this 60mm size. Old ones rusted very badly. I cant tell the make.
Where can I buy a spare?
Thanks in...
I've just drained my standard gravity fed system and replaced a couple of TRVs. I'm just about to re-fill, but I have noticed that a couple of the double radiators only have one bleed screw. Some of them have 2 screws as I would expect, one for each half, at the top on the "inside" of the...
1. Condense pumps (Jet branded) - this one has earth neutral live and 2 black wires for hi limit cut out. I just connected the LNE and omitted the black wires. Would this cause the pump to not work correctly?
2. Surely I can run the condense from the pump in any direction? I've had to run it...
My Potterton Profile boiler will soon be 20 years old and for some years British Gas has been shaking its head about spare parts being available, though at the last service the engineer did admit to carrying the most needed on his van. (I've just Googled "Potterton Profile spares" and it would...
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 :)
Hi
We have a problem - the pipe carrying water out of the top of the boiler is leaking and Warmflow say is an obsolete part and no longer available. Does anyone know of a supplier for parts for this old 70/90 boiler?
Many thanks.
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