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cylinder

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. P

    Pricing to replace a vented cylinder with an unvented cylinder (megaflo)

    Hello , ive recently gone out on my own, i have been working in the industry 15years now /g3 qualified and i would just like to get some advice from the knowledgable people on this forum! i have done a lot of installing but haven't really got involved with the design as somebody else has done...
  2. S

    URGENT Dripping hot water cylinder from upper thermostat... Is it safe?

    Hello I live in a rented flat and have noticed water dripping from the top thermostat of the water cylinder (see picture). It worries me as there is clearly electric wiring nearby, and also another thermostat at the bottom that the water is dripping towards. My landlord's plumber is...
  3. D

    URGENT No hot water from hot water cylinder

    Having difficulty with our hot water from hot water cylinder. Now don't have a clue which taps / valves should be on or off. No hot water coming through to the taps at all. Any help would be appreciated. Thanks
  4. Stants

    Unvented Cylinder size ? ( Evocyl )

    Hi all I'm having New heating set up installed in a loft conversion the Cylinder ( unvented ) and Boiler are being sited in a cupboard within the loft space ( adjacent to the new stairs ) im a bit tight on space Height and width as I am trying not encroach on the bedroom as much as is possible...
  5. A

    Liverpool New boiler and pressurised cylinder replace exist boiler in new location.

    I need a G3 qualified Heating Engineer to supply and install a new Vaillant 32kw ecotec central heating boiler with Green iQ system Vaillant smart heating control. Building has two bathrooms and one shower room and I want to increase ensuite facilities to four other rooms at a later date...
  6. M

    Combined direct vented hot water cylinder

    Hi, I have a combined direct vented hot water cylinder installed in my flat and it works on economy 7. Just recently I have noticed that when I open a hot tap the water didn't come out warm and also after about 2 minutes the cylinder or pipework to it started juddering. Just in case the heating...
  7. G

    Replacement hot water cylinder query

    I'm going to replace my hot water cylinder with as close as I can to like for like. Replacing as it doesn't have an immersion heater. It's a copper vertical 140Litre tank in an indirect vented system and the inlets and outlets seem pretty standard, except it has an outlet for the shower that's...
  8. Q

    Unvented cylinder install - safety concerns. Appreciate advise.

    Evening all, At risk of blabbing on i'll try keep this short. I recently replaced an old vented hot water system with a unvented system We went for the Telford Tempest 300L installed by G3 qualified person. Functionally it works well. Pressure is great, heats well, no leaks. There's still...
  9. H

    Unvented cylinder in celler

    If I install an unvented cylinder in a cellar and a system boiler on the ground floor above will the system still work?
  10. A

    Boiler Pressure and Cylinder Noise Issue

    Hi all, Any help with this one would be much appreciated as I have no knowledge of plumbing. I have a Potterton boiler and a Megaflo cylinder system. I have noticed that when the boiler fires up to heat the water that sometimes at the end of the cycle the boiler pressure drops on the gauge and...
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