Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
Why not syphons? I mean, pumps use power, quite a lot of it and are
relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Tim -- Please don't feed the trolls |
#2
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 20:04, Tim+ wrote:
Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Tim and sook really hard .... |
#3
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 20:04, Tim+ wrote:
Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. I'd hate to have to suck on the end to get it started Seriously. Yes, I would have thought siphoning from behind the dam, over the top and down to the bottom would make sense. Even if it wasn't as effective as pumping, it could surely supplement it. SteveW |
#4
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 20:04, Tim+ wrote:
Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Tim You've already said it: suitably sized. I don't know how far they need to deliver the water, but the flow rate is dependent on the frictional losses. The pumped system still recovers available potential energy. To get the same flow rate from a syphon will require *much* larger hoses, especially if they are long. |
#5
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
"Tim+" wrote in message
... Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. I suppose they would still need a pump to "prime" the syphon, and it would have to remain "in circuit" afterwards, because would be very difficult to remove safely when there's a lot of water flowing, and an unpowered pump may significantly reduce the possible flow rate. It also depends on there being a significant head of water between the inlet point and the point where it discharges into the spillway after going over the "hump" between reservoir and spillway. I wonder whether the power needed to drive the pumps does decrease once water is flowing and syphon conditions exist, or whether it is substantially the same no matter if the outlet is at the same level as the input or if the output is a lot lower than the input. |
#6
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 20:17, newshound wrote:
On 04/08/2019 20:04, Tim+ wrote: Why not syphons?Â* I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Tim You've already said it: suitably sized. I don't know how far they need to deliver the water, but the flow rate is dependent on the frictional losses. The pumped system still recovers available potential energy. To get the same flow rate from a syphon will require *much* larger hoses, especially if they are long. The videos show them pumping into a nearby river very close to the dam. Presumably some would only need getting to the bottom of the dam and would go downhill from there anyway. In either case, the hoses would be fairly short. Even if it couldn't replace pumping, it surely could supplement it. SteveW |
#7
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 20:20, NY wrote:
"Tim+" wrote in message ... Why not syphons?Â* I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. I suppose they would still need a pump to "prime" the syphon, and it would have to remain "in circuit" afterwards, because would be very difficult to remove safely when there's a lot of water flowing, and an unpowered pump may significantly reduce the possible flow rate. You can start a syphon by placing the whole pipe in the water, letting it fill, closing a valve on the end, lifting the end over and down and opening the valve. A job for a mobile crane. It also depends on there being a significant head of water between the inlet point and the point where it discharges into the spillway after going over the "hump" between reservoir and spillway. If the outlet were placed at the bottom of the dam, there would be a decent head until the reservoir was virtually empty. Even if the flow were not as great as with the pumps, more syphons could be used or they could be just used to supplement the pumps and drain the reservoir faster. I wonder whether the power needed to drive the pumps does decrease once water is flowing and syphon conditions exist, or whether it is substantially the same no matter if the outlet is at the same level as the input or if the output is a lot lower than the input. I would presume that the syphon effect would assist the pumps, at least be reducing the back pressure and counterbalancing frictional effects. SteveW |
#8
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 20:30, Steve Walker wrote:
On 04/08/2019 20:20, NY wrote: "Tim+" wrote in message ... Why not syphons?Â* I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. I suppose they would still need a pump to "prime" the syphon, and it would have to remain "in circuit" afterwards, because would be very difficult to remove safely when there's a lot of water flowing, and an unpowered pump may significantly reduce the possible flow rate. You can start a syphon by placing the whole pipe in the water, letting it fill, closing a valve on the end, lifting the end over and down and opening the valve. A job for a mobile crane. You probably don't want to be driving a mobile crane on the top of the dam. Yes it *could* be done with a Chinook and a lot of men on top of the dam. In the big scheme of things, fire engines have the pumps and hoses and experienced staff. A few thousand gallons of diesel is neither here nor there. |
#9
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 20:04, Tim+ wrote:
Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Tim Good luck syphoning at the rate the pumps have been working. https://www.buxtonadvertiser.co.uk/n...voir-1-9914361 |
#10
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
I got dragged into one of these years ago...under the building scotland
act a small dam is a dangerous building believe it or not....I didn't..... |
#11
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 20:04, Tim+ wrote:
Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. You also need an arrangement to start the siphon, which for the scales under discussion mean a valve or tap at both ends of the pipe, and a removable cover at the top of the siphon through which the whole caboodle is filled with water. |
#12
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 4 Aug 2019 19:04:59 GMT, Tim+ wrote:
Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. The Fire and Rescue service high volume pumps are part of the national reslience system. Seems there are 51 dotted about the country to be called upon locally or nationally as required. Each one is capable of delivering 7,000 litres per minute (enough to meet the demand of up to three fire engines all running flat out) over several km of hose. They are floating "sump pumps", the small red boxes in the water in some of the pictures. Seen reported that 16 of these are in use. The same pictures also reveal larger yellow pumps, presumably commercial pumps of even higher capacity. The coverage of these "technical" details is sadly lacking. Most people won't have any idea of the size of pipes and speed of flow that shifting that volume of water requires. For a syphon, you just need a suitably sized bit of pipe. And some means of priming it and some means of keeping the inlet clear enough of the bottom to stop it sucking that up and some means of shutting it off without needing to reprime. Shutting off if the outflow starts to cause damage at the discharge point of whatever is being used to carry the flow starts to flood further down stream due to local rain. -- Cheers Dave. |
#13
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
Yes but its really low pressure and if you want to move a lot at a time
there is no benefit to using a siphon. Incidentally, where ARE they putting all that water? Brian -- ----- -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! "Tim+" wrote in message ... Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Tim -- Please don't feed the trolls |
#14
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
At what level will they be able to check things out as to integrity etc? I
feel sorry for all the probably dead abandoned pets, so I'm just waiting for the court cases to start. Brian -- ----- -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! "Richard" wrote in message ... On 04/08/2019 20:04, Tim+ wrote: Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Tim Good luck syphoning at the rate the pumps have been working. https://www.buxtonadvertiser.co.uk/n...voir-1-9914361 |
#15
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
Tim+ wrote:
Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Tim It depends where they are moving the water to. When the story first broke (no pun intended) I looked at the area on Google maps. I doubt they are moving the water to below the damn- based on the area and what I d heard on the news. They seem to be diverting water which normally flows into the lake behind the damn and pumping it out into rivers in the area. Siphons require a €˜drop or €˜head which, especially as the level drops, probably wont exist on the high side of the damn. |
#16
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
In article ,
newshound scribeth thus On 04/08/2019 20:30, Steve Walker wrote: On 04/08/2019 20:20, NY wrote: "Tim+" wrote in message ... Why not syphons?* I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. I suppose they would still need a pump to "prime" the syphon, and it would have to remain "in circuit" afterwards, because would be very difficult to remove safely when there's a lot of water flowing, and an unpowered pump may significantly reduce the possible flow rate. You can start a syphon by placing the whole pipe in the water, letting it fill, closing a valve on the end, lifting the end over and down and opening the valve. A job for a mobile crane. You probably don't want to be driving a mobile crane on the top of the dam. Yes it *could* be done with a Chinook and a lot of men on top of the dam. In the big scheme of things, fire engines have the pumps and hoses and experienced staff. A few thousand gallons of diesel is neither here nor there. And it can only be supposed that the river their pumping into is at or near capacity?.. -- Tony Sayer Man is least himself when he talks in his own person. Give him a keyboard, and he will reveal himself. |
#17
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On Sunday, 4 August 2019 22:42:12 UTC+1, tony sayer wrote:
A lake near here was drained a few years ago for maintenance of its dam. They used two siphon hoses each about 15cm diameter and it took about two weeks. Each hose had a strainer at the sucking end. I don't know how the siphons were started, but they kept going happily until the lake was nearly empty. John |
#18
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 20:16, Steve Walker wrote:
On 04/08/2019 20:04, Tim+ wrote: Why not syphons?Â* I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. I'd hate to have to suck on the end to get it started Seriously. Yes, I would have thought siphoning from behind the dam, over the top and down to the bottom would make sense. Even if it wasn't as effective as pumping, it could surely supplement it. SteveW you can't siphon up more than 32ft -- There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact. Mark Twain |
#19
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 23:30, The Natural Philosopher wrote:
On 04/08/2019 20:16, Steve Walker wrote: On 04/08/2019 20:04, Tim+ wrote: Why not syphons?Â* I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. I'd hate to have to suck on the end to get it started Seriously. Yes, I would have thought siphoning from behind the dam, over the top and down to the bottom would make sense. Even if it wasn't as effective as pumping, it could surely supplement it. SteveW you can't siphon up more than 32ft Correct, but that's a fair way down that dam. SteveW |
#20
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
"NY" wrote in message ... "Tim+" wrote in message ... Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. I suppose they would still need a pump to "prime" the syphon, and it would have to remain "in circuit" afterwards, No it wouldnt. because would be very difficult to remove safely when there's a lot of water flowing, No it isnt. Just a couple of quick release valves like those used with street fire hoses would work fine.; Have one near the pump that is closed when priming, and another between the pump and the bottom of the syphon. Once the syphon is primed, open the valve that lets the water out of the syphon near the pump, close the one between the pump and the syphon, remove the pump. and an unpowered pump may significantly reduce the possible flow rate. Thats why its removed, so it can be used to start another syphon. It also depends on there being a significant head of water between the inlet point and the point where it discharges into the spillway after going over the "hump" between reservoir and spillway. Yes, but by definition any dam has that. I wonder whether the power needed to drive the pumps does decrease once water is flowing and syphon conditions exist, No it doesnt. or whether it is substantially the same no matter if the outlet is at the same level as the input or if the output is a lot lower than the input. Thats correct. |
#21
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
"Brian Gaff" wrote in message ... Yes but its really low pressure and if you want to move a lot at a time there is no benefit to using a siphon. Incidentally, where ARE they putting all that water? Where it would go if the dam had not failed and it was flowing into the spillway when full. "Tim+" wrote in message ... Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Tim -- Please don't feed the trolls |
#22
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
newshound explained :
The pumped system still recovers available potential energy. That energy recovery will be minimal, because the flow in the outlet pipe usually breaks up, with air filling the top of the pipe, so no much syphon effect if any. Watch what happens in a flexible/ none rigid discharge pipe. |
#23
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
Tim+ wrote:
Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Is there a size of pipe above which a syphon won't work because the water empties out of the down pipe without 'sucking' the water above down? It works well with small pipe because, I assume, surface tension helps to prevent the water from 'dropping out'. -- Chris Green · |
#24
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
NY was thinking very hard :
I wonder whether the power needed to drive the pumps does decrease once water is flowing and syphon conditions exist, or whether it is substantially the same no matter if the outlet is at the same level as the input or if the output is a lot lower than the input. The power input required, does reduce dramatically when a syphon effect begins to operate. |
#25
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 23:30, The Natural Philosopher wrote:
On 04/08/2019 20:16, Steve Walker wrote: On 04/08/2019 20:04, Tim+ wrote: Why not syphons?Â* I mean, pumps use power, quite a lot of it and are relatively expensive. For a syphon, you just need a suitably sized bit of pipe. Pumps can also move a lot more water per unit time than a siphon. I'd hate to have to suck on the end to get it started Seriously. Yes, I would have thought siphoning from behind the dam, over the top and down to the bottom would make sense. Even if it wasn't as effective as pumping, it could surely supplement it. SteveW you can't siphon up more than 32ft And you would need a pipe on the up side to the top that can stand having 1 atm of pressure trying to crush it. It could work though to get the level down to 10m below the level of the spillway. A pump always ensures positive pressure inside the pipe keeping it open. -- Regards, Martin Brown |
#26
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
After serious thinking Steve Walker wrote :
If the outlet were placed at the bottom of the dam, there would be a decent head until the reservoir was virtually empty. That works with a small pipe where the surface tension helps, but not in larger pipes of this size. Theoretical maximum head is 32 feet, practical is much less than that even trying to pump - you are not so much pumping it up to a pump as sucking it up to a pump and letting gravity deliver it down the discharge pipe. Even if the flow were not as great as with the pumps, more syphons could be used or they could be just used to supplement the pumps and drain the reservoir faster. Both ends of the pipe would need to be under water, or the syphon effect would be lost immediately as air entered the discharge pipe. The syphon effect doesn't work quite so well in a large pipe unless both ends are well submerged. |
#27
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
Chris Green formulated the question :
Is there a size of pipe above which a syphon won't work because the water empties out of the down pipe without 'sucking' the water above down? It works well with small pipe because, I assume, surface tension helps to prevent the water from 'dropping out'. Correct! Air has to be prevented from being sucked up the discharge pipe, by having the discharge under water, or the syphon will be immediately lost with a larger pipe. |
#28
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 21:16, Brian Gaff wrote:
At what level will they be able to check things out as to integrity etc? They say it is necessary to bring the water level down eight metres to bring it below the level of the damage to the dam. That is about one third of the overall height. The dam has a long history of problems with leaks and structural problems and the reservoir has been drained before to carry out maintenance work. I feel sorry for all the probably dead abandoned pets, so I'm just waiting for the court cases to start. From the reports, pets are what most people who went back into the area for their allotted 15 minutes brought out. -- Colin Bignell |
#29
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
The Natural Philosopher wrote:
you can't siphon up more than 32ft An interesting discussion he "The height limit of a siphon" A. Boatwright, S. Hughes. J. Barry Scientific Reports volume 5, Article number: 16790 (2015) https://www.nature.com/articles/srep16790 #Paul |
#30
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 04/08/2019 21:13, Brian Gaff wrote:
Yes but its really low pressure and if you want to move a lot at a time there is no benefit to using a siphon. Incidentally, where ARE they putting all that water? Brian You can see some of the outlet pipes emptying onto the concrete spillway, on the opposite side from the failure. Other pictures seem to show more outlets running straight into a waterway. -- Colin Bignell |
#31
Posted to uk.d-i-y
|
|||
|
|||
Lonely Psychopathic Senile Ozzie Troll Alert!
On Mon, 5 Aug 2019 14:30:15 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again: I suppose they would still need a pump to "prime" the syphon, and it would have to remain "in circuit" afterwards, No LOL No LOL No LOL -- Kerr-Mudd,John addressing senile Rot: "Auto-contradictor Rod is back! (in the KF)" MID: |
#32
Posted to uk.d-i-y
|
|||
|
|||
Lonely Psychopathic Senile Ozzie Troll Alert!
On Mon, 5 Aug 2019 14:43:31 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again: Yes but its really low pressure and if you want to move a lot at a time there is no benefit to using a siphon. Incidentally, where ARE they putting all that water? Where it would go if the dam had not failed and it was flowing into the spillway when full. Are you sure, senile Mr Know-it-all? Senilely sure, again? -- Website (from 2007) dedicated to the 85-year-old trolling senile cretin from Oz: https://www.pcreview.co.uk/threads/r...d-faq.2973853/ |
#34
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
"nightjar" wrote in message
... On 04/08/2019 21:13, Brian Gaff wrote: Yes but its really low pressure and if you want to move a lot at a time there is no benefit to using a siphon. Incidentally, where ARE they putting all that water? Brian You can see some of the outlet pipes emptying onto the concrete spillway, on the opposite side from the failure. Other pictures seem to show more outlets running straight into a waterway. I may have missed something in the earlier new reports, but why are they having to *pump* water out of the reservoir? Is there a problem with taking water out in the normal way? I think it's a canal feeder reservoir. Can the canals not cope with a greater flow of water into them than was originally intended? Are the water courses that the pumps drain into separate from the canal network - is the canal not also fed from them and the spillway? I don't understand about blocking the streams that feed into the reservoir? Won't water just build up behind the temporary "dams" that the Chinooks are making, causing them to burst catastrophically at some stage in the future? |
#35
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 05/08/2019 10:18, NY wrote:
"nightjar" wrote in message ... On 04/08/2019 21:13, Brian Gaff wrote: Yes but its really low pressure and if you want to move a lot at a time there is no benefit to using a siphon. Incidentally, where ARE they putting all that water? Â* Brian You can see some of the outlet pipes emptying onto the concrete spillway, on the opposite side from the failure. Other pictures seem to show more outlets running straight into a waterway. I may have missed something in the earlier new reports, but why are they having to *pump* water out of the reservoir? Is there a problem with taking water out in the normal way? I think it's a canal feeder reservoir. Can the canals not cope with a greater flow of water into them than was originally intended? Canals are designed to lose as little water as possible with each lock movement so they cannot be used to dump water into without seriously damaging the mechanisms. There is usually a small bypass for any excess. Are the water courses that the pumps drain into separate from the canal network - is the canal not also fed from them and the spillway? The natural rivers that drain that area. Snag is you can't dump too much into them quickly either without consequential flood damage downstream. They have to balance competing risks. I don't understand about blocking the streams that feed into the reservoir? Won't water just build up behind the temporary "dams" that the Chinooks are making, causing them to burst catastrophically at some stage in the future? It buys a bit of time and the trapped water may well soak away more slowly rather than overtopping the barriers. One trick they have been using for a while it to put multiple small barriers into high moor becks to slow the rate it runs off the top in a massive deluge. Mainly to slow erosion but also to alleviate flooding in some places. -- Regards, Martin Brown |
#36
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
On 05/08/2019 10:18, NY wrote:
I may have missed something in the earlier new reports, but why are they having to *pump* water out of the reservoir? Is there a problem with taking water out in the normal way? I think it's a canal feeder reservoir. Can the canals not cope with a greater flow of water into them than was originally intended? Canals weren't designed to carry a significant flow of water. They're a series of long thin "lakes" connected by locks where there's a change in level. Every time a boat passes through a lock a lock's worth of water escapes from the higher section to the lower one. Apart from that there's very little flow. |
#37
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
|
#38
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
Dave Liquorice wrote:
On 4 Aug 2019 19:04:59 GMT, Tim+ wrote: Why not syphons? I mean, pumps use power, quite a lot of it and are relatively expensive. The Fire and Rescue service high volume pumps are part of the national reslience system. Seems there are 51 dotted about the country to be called upon locally or nationally as required. Each one is capable of delivering 7,000 litres per minute (enough to meet the demand of up to three fire engines all running flat out) over several km of hose. They are floating "sump pumps", the small red boxes in the water in some of the pictures. Seen reported that 16 of these are in use. The same pictures also reveal larger yellow pumps, presumably commercial pumps of even higher capacity. The coverage of these "technical" details is sadly lacking. Most people won't have any idea of the size of pipes and speed of flow that shifting that volume of water requires. I see under the scheme that you mention our Brigade, Hampshire has deployed some resources. They have some pumps in their inventory that are intended for use on ships in in the ports of the county which are a type of ejector pump with no moving parts into which high pressure water is pumped. I have witnessed some in use on exercise with where they emptied the ballast tanks of a ship using it, it seems strange to see water pumped into a space you want to empty of it but more is removed than is being pumped in by quite a percentage using the Venturi effect . They are mentioned in this document around page 46. https://www.ukfrs.com/sites/default/...Supplies.pd f The lack of moving parts is a great advantage especially in a ships hold where floating debris could jam or damage a mechanical one, one of the pumps uses is to pump water accumulating within a hull from shoreside hoses deployed on a fire as by the time you bring a fire under control may have sunk or destabilised the ship. ICBW but I think at one time the version they used was known as the Southampton Ejector Pump as it was developed by the brigade in that city (town at the time) due to the large amount of dock estate they cover. GH |
#39
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
Brian Gaff wrote:
Yes but its really low pressure and if you want to move a lot at a time there is no benefit to using a siphon. Incidentally, where ARE they putting all that water? Brian How far away is the nearest lager plant. GH |
#40
Posted to uk.d-i-y
|
|||
|
|||
Whaley Bridge pumps...
In article , Marland
scribeth thus Brian Gaff wrote: Yes but its really low pressure and if you want to move a lot at a time there is no benefit to using a siphon. Incidentally, where ARE they putting all that water? Brian How far away is the nearest lager plant. GH It sez that Jeremy Corbyn was there yesterday so brewery **** up organise all adds up;!... -- Tony Sayer Man is least himself when he talks in his own person. Give him a keyboard, and he will reveal himself. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
build a bridge to build a bridge..... | Metalworking | |||
FS Norris plane, Porter Cable Bridge City Toolworks | Woodworking | |||
Bridge Crane for sale. | Metalworking | |||
Bridge Rectifier | Electronics | |||
Need Advice for Fabricating Engine Support Bridge | Metalworking |