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Post by Deleted on Jul 11, 2016 18:42:19 GMT
My hot and cold taps tend to spit a mix of air and water. This seems odd as all parts of the system are under pressure and we have no leaks. I wonder if this is caused by baffles in the fresh water tank mixed with poor venting? There is only one vent and it's about 15mm. Any suggestions? I don't notice this in the shower.
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Post by JohnV on Jul 11, 2016 21:34:16 GMT
I have been trying to think of what could cause those symptoms....... odd !!
I can't see how it could have anything to do with tank baffles or tank air vents.
It can't be from the plumbing post pump because, as you say it is under constant pressure.
That only leaves the pump itself, any pre pump filter and it's housing and the pipe between the tank and the pump.
I would suspect that the pump is sucking air in through a joint in that area.
The water pressure in the pipes and joints there is low and is possibly insufficient to cause an obvious leak but enough to let air suck in when the pump operates.
my first guess would be the pre filter if fitted
Good luck
John
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Post by Saltysplash on Jul 11, 2016 21:53:32 GMT
Is it all taps? sounds like an airlock somewhere
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Post by phil70 on Jul 11, 2016 22:21:21 GMT
I would agree with John, if the pump was sucking in air it would be compressed so the water pressure would remain constant until it reached a tap when it would splutter, this would explain why both hot and cold are both effected.
Phil
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Post by Mr Stabby on Jul 11, 2016 22:26:33 GMT
Your water tank is empty.  |
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Post by phil70 on Jul 12, 2016 0:15:26 GMT
Your water tank is empty. And that is the principle of KISS Phil |
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Post by Deleted on Jul 12, 2016 6:49:41 GMT
Tank is full. Yes, a leak on the suction side seems the best theory to go with. I have not seen the pump or filter yet. They are probably under the bed as I have checked under galley sink. It affects bathroom AND galley taps. I think it's worse after topping up the FW tank and wondered if some air was dissolved in the water. But that would probably only affect the hot water.
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Post by Mr Stabby on Jul 12, 2016 7:50:00 GMT
Tank is full. Yes, a leak on the suction side seems the best theory to go with. I have not seen the pump or filter yet. They are probably under the bed as I have checked under galley sink. I may be wrong here but I thought the pump was usually located as close to the tank as possible? |
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Post by Deleted on Jul 12, 2016 7:53:50 GMT
I can hear the pump and it's aft of the galley. I agree that it would be better near the tank!
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Post by JohnV on Jul 12, 2016 7:59:16 GMT
It is certainly considered good practice
(my grammer is a bit rusty I was trying to work out if it was a noun or a verb ...... I think "good practiCe" must be a noun ..... I'm sure someone wot went to a proper skool will be along to correct me) (actually not so much the school but the length of time between then and now)
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Post by Deleted on Jul 12, 2016 8:19:50 GMT
Good is an adjective and practice is a noun so your grammar is perfect!
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Post by Deleted on Jul 14, 2016 7:51:01 GMT
The cover of the suction strainer was loose! And the Shurflo pump is leaking slightly. I dismantled it and the seals look OK but I shall have to fit new ones or replace the pump. It is a 3901-0213. since tightening the cover the taps have stopped spurting.
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Post by JohnV on Jul 14, 2016 9:37:43 GMT
Great !!!
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Post by Deleted on Jul 14, 2016 18:38:58 GMT
I fitted a Jabsco at £55. New diaphragm/driver would be £34 plus postage. However carefully I tighten the screws it still leaks from the diaphragm. Is this a common problem? The Jabsco has push-in connectors so you can finish the plumbing and then fit the pump! Nice!
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Post by JohnV on Jul 14, 2016 18:49:19 GMT
Do you mean tightening the diaphragm on the Shurflow ?
my water pump is a Jabsco Parmax (the first one lasted about 10 years and when it went I bought a new one and a reconditioning kit and overhauled the other) I certainly have not had problems with leaking diaphragms on them.
The only complaint I have about the design of the Parmax, is that the models I have, use a standard industrial microswitch for the pressure control which isn't quite strong enough.
I use it to operate a heavy duty relay which then switches the pump motor.
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