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A hydrothermal vent is a fissure on the seafloor from which geothermally heated water discharges. Hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart at spreading centers, ocean basins, and hotspots. Hydrothermal deposits are rocks and mineral ore deposits formed by the action of hydrothermal vents.
Hydrothermal vents exist because the earth is both geologically active and has large amounts of water on its surface and within its crust. Under the sea, hydrothermal vents may form features called black smokers or white smokers. Relative to the majority of the deep sea, the areas around submarine hydrothermal vents are biologically more productive, often hosting complex communities fueled by the chemicals dissolved in the vent fluids. Chemosynthetic bacteria and archaea form the base of the food chain, supporting diverse organisms, including giant tube worms, clams, limpets and shrimp. Active hydrothermal vents are thought to exist on Jupiter's moon Europa, and Saturn's moon Enceladus, and it is speculated that ancient hydrothermal vents once existed on Mars.

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  1. B

    the new baxi open vent boiler

    anyone seen one yet .
  2. C

    Hydroboil Plus vent

    I am installing a Hydroboil plus and have read the instructions about the vent. Every similar set up i have seen has the vent going into the sink. What are peoples opinions on this. It is certainly the easiest way to do it. Having done my G3 and learnt all about D2 pipework it doesn't seem...
  3. R

    soil and vent system

    Hi guys, I am aware this is a long shot but I am trying to identify a soil and vent system I have never come across before, can you help? Its a black rigid material, from the outside it looks like black painted asbestos but its not. Its installed in a domestic property built around 1960, when I...
  4. B

    Viessmann 100-w 35kW open vent boiler....."boomph" noise as boiler ignites.

    I dont know whether or not a "boomph" noise with the boiler casing moving a little on ignition is normal for these boilers......if there could be a fault can you point me towards the possibilities? If this is the way these boilers sound? Just noticed this the other day as its in the garage. A...
  5. F

    What is this below the automatic air vent valve?

    The (apparently rotated) picture shows my badly scaled up automatic airvent valve just a few cm downstream from the pump. I have some water hammer (hydraulic shock) when the pump goes off and this scaled up air vent is my prime suspect. I am ready to drain the system down and screw this old...
  6. B

    Combi on open vent?

    Just been to work on an oil combi which went in when the house was built just 7 years ago. Plumbed in on open vent? Couldn't believe it! I guess it will always have .6 bar but why would anyone do that? F&E tank full of botany as pump on no.3. Anyone done/ seen this?
  7. P

    3T advice - connecting conventional oil boiler feed and vent

    Hi new member here seeking basic advice on 3T connections. The current system uses a conventional vented oil boiler on the ground floor and is an old single pipe sytem with the boiler feed and vent from the expansion tank connected across the hot water cylinder heat exchanger on the 1st floor...
  8. S

    Vent Pipe.

    Hi, Could someone please help me. The original vent section of he soil pipe ha been cut off and replaced with a bossed pipe. connected to this is a 50mm waste pipe from the basin and bath into the soil stack. This 50mm pipe also serves as the vent pipe for the system, going up the wall and...
  9. B

    Capping off a vent pipe

    F&E tank, big house, full of slime, vent capped off. Why would someone do that? Boiler wired up weird too, on HW, tank stat opens 2PV but doesn't turn boiler on, valve only wired to the stat. Any logic in this? Cable runs are easy, boiler directly below cylinder. Cheers
  10. R

    converting from open vent to sealed primary

    Hello folks, converting open vent system to sealed heating system (hot water to remain vented) - the boiler is fine to convert (glowworm ultimate), as is cylinder. I know it needs expansion vessel, safety valve, gauge, filling loop etc. Initial query: can the safety valve go in the airing...
  11. S

    Bunging the cold feed and vent

    Whats the point of this when you want to change a rad and re-pipe? All it does is hold the water in the f and e tank. The existing rad pipework drains anyway with the pipework under the floor and when re-filling the system if there is any carp in there this will still drop into the pipework...
  12. S

    external air admittance vent

    Hi, Can I use an external air admittance vent, such a floplast, inside. To me the inside and outside one are very similar except for the protection that outside one has around the vent. Many thanks Seb
  13. D

    F+E tank with no vent

    hi i was just wondering if this is normal or it it was a mistake. the F+E tank never had a vent on it, we drained it down and it took 2 hours to get up and running. some of the air was coming though the cold feed to the primaries to the tank. I've had a look though my college books but can't...
  14. A

    feed and expansion tank but no vent??

    Hi fellas, At a house yesterday - had to drain down central heating system ( oil fired ) , to replace circ pump/ pump valves and 2 port valve. After refilling system had a serious problem getting heat into the downstairs rads - it was when trying to clear a poss air lock that I discovered...
  15. S

    Reverse auto air vent devise?

    Is there a devise that can be attached to a fixed ceiling shower head to allow the water to drain out once the shower has finished being used. There is pipework in the loft that we can attach a devise to. Im in thinking something that's a reverse of an auto air vent. Or a durgo. Does such...
  16. D

    Vent or no vent for additional bathroom

    Hi there, Looking to get more advice as a couple of plumbers I called I told e different things and i want o get it right. I am adding a ensuite to a room and was planning to get it connected to the existing main drain running along the back of the house (where existing bathroom and cast-iron...
  17. J

    Circulations problems on a upland open vent system

    Turning into a bit of a ballache... had everywhere roasting, couple of hours latter downstairs living room rad goes cold an a bedroom one.. had hose on drain offs, throttled lock shields right down on upstairs, trvs off on rads an at times it gets hot, then stops... it has x400 in system to...
  18. D

    Increase Wall Vent Dia

    Hi all, I have about 120mm dia (four and a half inch) circular vent hole in my kitchen wall. The issue I am faced with is that Most of the vent kits are either 100mm, 125mm or 150m. The vent is for extractor hood. Manufacturer recommend min 120m but prefer 150mm for maximum extraction. What...
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