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cylinders

A cylinder (from Greek: κύλινδρος, romanized: kulindros, lit. 'roller', 'tumbler') has traditionally been a three-dimensional solid, one of the most basic of curvilinear geometric shapes. Geometrically, it can be considered as a prism with a circle as its base.
This traditional view is still used in elementary treatments of geometry, but the advanced mathematical viewpoint has shifted to the infinite curvilinear surface and this is how a cylinder is now defined in various modern branches of geometry and topology.
The shift in the basic meaning (solid versus surface) has created some ambiguity with terminology. It is generally hoped that context makes the meaning clear. Both points of view are typically presented and distinguished by referring to solid cylinders and cylindrical surfaces, but in the literature the unadorned term cylinder could refer to either of these or to an even more specialized object, the right circular cylinder.

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  1. R

    Gravity hot water

    I inherited a gravity system in a hotel i look after. a 64 kw oil boiler heats indirectly two high level horizontal cylinders which when hot gravitate hot water through 11/2 flow and returns to two more cylinders at opposite ends of the hotel. As i say all by gravity not a pump in site and has...
  2. K

    Anyone use copper unvented cylinders

    As the title says, I was wondering if anybody uses or has experience of copper unvented cylinders? There is a very large block of apartments near me (600ish) and about half of them have manco copper unventeds. Pressure reducing valve set to 2.1 bar.9 yrs old and theyre all exploding. Even...
  3. B

    Fortic/combination hot water cylinders

    I've been to a job with a leaky cylinder, drained it all down and now need to replace like for like. Looking on plumb center website, it says 900x450, is 900 the height of the entire unit or just the hot water storage part (not including the cold water storage on top)? Probably a stupid...
  4. Chalked

    Pressurised cylinders that work at higher than 3.5 bar

    As the title suggests, anyone had much experience with cylinders with a higher pressure rating? i see megaflo do a commercial range that can run up to 10 bar. Looking fir for suggestions for manufactures and what type/ size they use for pressure reducing valves . its for a large house 9...
  5. C

    Space below cylinder?

    Replacing an ancient copper hot water cylinder. The airing cupboard has a fully boarded floor and the cylinder is supported on three bearers, resting on the floor, each approximately an inch and a half wide by two inches high. I question whether bearers are needed? Can I just put the new...
  6. D

    Linking Two Unvented Cylinders

    Hi looking for some help please. Need a plumber to install heating and hot water from scratch in a new-build. I want to go a bit flash and install a round bath. The bath holds 405 litres of water. I also have a steam shower cabin to install which has about a zillion shower jets. The rest of...
  7. S

    imploded cylinders

    i was explaining to a friend on a different forum about how cylinders can implode and i searched for a picture on google and couldnt find one i know there was a picture on here recently can anyone link me to it ?
  8. S

    imploded cylinders

    i was explaining to a friend on a different forum about how cylinders can implode and i searched for a picture on google and couldnt find one i know there was a picture on here recently can anyone link me to it ?
  9. J

    Immersion heater issues

    Hi i recently replaced a very old cylinder for a customer, he had a very old direct cylinder, which had split and was leaking, I couldn't get a direct cylinder straight away so after speaking to the merchants he recommended I install an indirect cylinder and cap off the unused coil, which I...
    • Johno82
    • Thread
    • cylinder cylinders heater immersion immersion heater issue issues never
    • Replies: 17
    • Forum: Plumbing Jobs | The Job-board
  10. R

    Hot water cylinders

    Hi Apologies in advance for the very basic post (I'm new to this!). My current hot water cylinder needs replacing and I've been looking at replacements online - can anyone help with any recommendations for an unvented direct hot water cylinder around the 170/180ltr mark? I've...
    • rwidget
    • Thread
    • advance cheaper cylinder cylinders hot hot water qualified water yourself
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  11. Worcester

    Challenge with Cascaded ACV Cylinders

    See my post here: http://www.ukplumbersforums.co.uk/renewable-energy/73288-acv-cylinders-back-front.html Any ideas? - respond over there please Thx
  12. Worcester

    ACV Cylinders - back to front??

    Just visited a site today where they are having big problems with insufficient volume and insufficient flow of hot water. Happens to be heated by ASHP (a cascaded bank of 5 x 9kW) so posted it here :) (maybe I should have put it in the commercial forum :) ) Attached a schematic, looking from...
  13. G

    Albion Ultrasteel unvented cylinders. Experiences?

    Fitted an Albion unvented cylinder for a friend around one and a half years ago now. It's been nothing but a pain, made even worse that it's in a friends house! Firstly I fitted it as an indirect cylinder which he ran off the immersion via economy seven as there was no boiler. This was stage...
  14. W

    Telford Tempest Cylinders - this is beyond a joke!

    Well, instead of letting me source the cylinder, the customer decided to go out and purchase a Telford Tempest solar cylinder. I've never fitted a Telford cylinder before (and never will again) On commencing installation, I found that the coil was obstructing the immersion heater when I tried to...
  15. R

    Sponsored thread - unvented cylinders in funny shapes and sizes

    Hi All We all know the benefits of using unvented cylinders when pressure and flow permit, but sometimes that airing cupboard just isnt the right shape. Thats where it would be handy to have an unvented unit that was taller and thinner, or perhaps shorter and fatter, or maybe even lying on its...
  16. B

    Blue water!

    I had a call from a customer a few weeks back saying he had blue water coming out of his taps. I thought the bloke was taking the p! He said I had to see it you won't believe yer eyes! Well blue was an under statement!! I could only put it down to electrolysis. I completely changed the...
  17. P

    Can these cylinders still be Bought/Installed?

    As per pic below, can you get straight swaps for these and are they still allowed under regs etc? Thanks
  18. C

    Unvented Cylinders

    One of the places I contract too has a building with 32 unvented cylinders, I noticed they havnt been touched since they were installed 3 years ago, I told them they need to be serviced so they asked me if I could do it to which I replied "of course I can " so the same afternoon I booked myself...
  19. townfanjon

    thermal store

    gents, this is probably worth a punt. Does anybody know of a thermal store cylinder(150 litre) that has nt got the sprayed on insulation on show i.e the customer wants to look at a shiny white case. The only one I know of is the mega bucks elson aquanox. I would nt entertain a pullsar coil...
  20. W

    Installing Hot water Cylinders. Do You Need to Register Them?

    Hi There, I was just wondering if when replacing a hot water cylinder (vented), do you need to Bench Mark them and/or register their installation with the local council building control? Obviously, you need to check everything is working correctly, but do you need to send off paper work...
    • wild nomad
    • Thread
    • around council cylinders hot hot water installing register through vented water
    • Replies: 7
    • Forum: Plumbing Jobs | The Job-board
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