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Post by Deleted on Dec 31, 2016 18:24:08 GMT
Martin it's getting tiresome arguing with you. You hit lucky. Ricco may not - just as we didn't at work, our kit is housed in a 20'container, remarkably similar to a canal boat tbh. All pipework was lagged to prevent operators burning themselves and help steam efficiency - we still ended up spending thousands putting it right for the want of opening some drain valves. No your pump will still have water in it, if you take the top off the strainer if you have one and then run it for several minuets that will draw air through the pump, but you need to leave very little water in it to damage it. Also thermostatic show valves seam high on the list for damage and of course gas water heaters. I knew of 3 cases of split cauliflowers a few years back. No amount of lagging in the world will work if its cold enough for long enough Tell Martin not me!! I take my pump off and put it in my office at work Tmvs are high risk as they have non return valves in em, ricco probably doesn't have any of those either.
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Post by Deleted on Dec 31, 2016 18:29:36 GMT
For those interested, we had the coil on one of these spilt. The green thing in the middle is the business end, it houses a coil inside the lagged green shell - much like a domestic cauliflower, we had a coil fail on one along with no end of associated kit. A second unit the coil remained sound but we lost the softener for the feed water along with a steam trap and most of the steam outlet valves and pipework.
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Post by Deleted on Dec 31, 2016 20:15:02 GMT
No your pump will still have water in it, if you take the top off the strainer if you have one and then run it for several minuets that will draw air through the pump, but you need to leave very little water in it to damage it. Also thermostatic show valves seam high on the list for damage and of course gas water heaters. I knew of 3 cases of split cauliflowers a few years back. No amount of lagging in the world will work if its cold enough for long enough Tell Martin not me!! I take my pump off and put it in my office at work Tmvs are high risk as they have non return valves in em, ricco probably doesn't have any of those either. I will reserve comment untill I know where they were located. as I said ours was inside the back rear cabin under a bunk. as I mentioned location before this is relevant. If a calorifier is simply under the deck boards in the engine compartment then I wouldn't have left it full. last word freak you most certainly are.
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Post by Telemachus on Dec 31, 2016 20:35:41 GMT
1/ turn off water
2/ take off the strainer and run pump -which is quite good at pumping air through the system
3/ open cold taps one at a time (close them afterwards)
4/ one hot taps one at a time (close them afterwards
5/ start washing machine so it starts to fill, until you hear air going through it
6/ remove shower hose from tap fitting, dangle in shower tray.
7/ open shower valve, switch between hot and cold
8/ operate toilet flush until air comes out.
9/ switch off pump.
10/ open all taps.
Although the calorifier will still be full of water, you will have introduced quite a bit of air which allows for ice expansion. There is a big difference between Gazza's container on dry land, and a boat whose hull is well immersed in liquid water.
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Post by IainS on Dec 31, 2016 21:39:58 GMT
To add to the above, if you have a drinking water filter, make sure it's emptied of water. Most need the the bowl taken off and emptied. Running air through the system until air comes out of the drinking water tap is not good enough!
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Post by Deleted on Jan 1, 2017 9:55:24 GMT
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Post by Clinton Cool on Jan 1, 2017 11:16:39 GMT
1/ turn off water 2/ take off the strainer and run pump -which is quite good at pumping air through the system 3/ open cold taps one at a time (close them afterwards) 4/ one hot taps one at a time (close them afterwards 5/ start washing machine so it starts to fill, until you hear air going through it 6/ remove shower hose from tap fitting, dangle in shower tray. 7/ open shower valve, switch between hot and cold 8/ operate toilet flush until air comes out. 9/ switch off pump. 10/ open all taps. Although the calorifier will still be full of water, you will have introduced quite a bit of air which allows for ice expansion. There is a big difference between Gazza's container on dry land, and a boat whose hull is well immersed in liquid water. Useful step by step, thanks! Am I right in thinking then that there's no need to do anything specific with the gas water heater, as opening the hot water tap, pump on but water off, will have the effect of purging the heater of most of its water? Also, I seem to recall that the instructions for my pump included that it's not designed to be dry running. Bearing this in mind, how long would you allow the pump to run dry, purging the water in the various systems, to strike the best balance between getting rid of the water but not damaging the pump?
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Post by Deleted on Jan 1, 2017 11:47:45 GMT
I wouldn't run a pump dry as nick suggests.
A quick cycle with the strainer off and that's it It's up to you with the gas heater but they are very frost prone. I wouldn't risk it for the sake of one drain plug
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Post by Deleted on Jan 1, 2017 12:57:25 GMT
The Shur Flo and Jabsco domestic water pumps can be run dry as they are reciprocating diaphragm types. I wouldn't run it dry indefinitely but a few minutes can't hurt. The kind of Jabsco used as a cooling water circulating pump with rubber vanes should not be run dry.
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Post by Deleted on Jan 1, 2017 13:22:00 GMT
The Shur Flo and Jabsco domestic water pumps can be run dry as they are reciprocating diaphragm types. I wouldn't run it dry indefinitely but a few minutes can't hurt. The kind of Jabsco used as a cooling water circulating pump with rubber vanes should not be run dry. The water pump in our Caravan is an inboard mounted Sure Flo, similar to what we had on the boat The instructions for winter draining down specifically say to disconnect the quick release joints and run it briefly (I guess the emphasis is on briefly!) for a few seconds to expel any water. I have done this each time I have left the 'van when there has been the chance of freezing weather before we use it again, with no apparent ill effects.) It self primes when I reconnect the water and open a tap to activate it. I must admit though I never did this with the boat pumps (the Dog House had two) but access wasn't brilliant and the connectors were a bit more of a faff.
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Post by Deleted on Jan 1, 2017 13:44:20 GMT
Shurflo do make some pumps that can't be run dry so please check your manual. I just checked on their website!
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Post by Telemachus on Jan 1, 2017 14:41:43 GMT
Shurflo do make some pumps that can't be run dry so please check your manual. I just checked on their website! I take the point about reading the manual, but I would say that any freshwater pump that can't be run dry for a minute or two isn't fit for purpose. What happens when you are in the shower and run the tank dry for example? Most pumps don't want to run dry for hours since the water passing through has some cooling effect, but equally most pumps are rubber diaphragm type and don't mind a modest amount of dry running - a few minutes isn't going to cause an overheating issue.
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Post by Deleted on Jan 1, 2017 14:45:10 GMT
Agreed. Shurflo say, 'don't run continuously for more than 15 minutes' but this is wet.
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Post by Deleted on Jan 1, 2017 14:46:57 GMT
Shurflo do make some pumps that can't be run dry so please check your manual. I just checked on their website! I take the point about reading the manual, but I would say that any freshwater pump that can't be run dry for a minute or two isn't fit for purpose. What happens when you are in the shower and run the tank dry for example? Most pumps don't want to run dry for hours since the water passing through has some cooling effect, but equally most pumps are rubber diaphragm type and don't mind a modest amount of dry running - a few minutes isn't going to cause an overheating issue. You mean the Hudson hasn't got a freshwater level gauge? We use the distance the arse is out of the water to tell how much is left in the tank.
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Post by lollygagger on Jan 1, 2017 15:03:07 GMT
It's really obviously uphill to the front when mine's running low, but there's over a ton of water in it when it's full so it would be.
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