bilge pump rpoblem
- Thread starter isha
- Start date
VicS
Well-Known Member
If it were mine I would try the idea of a small hole in that 12" section of pipe between the pump and the NRV.
If that does not work, given the geography of the layout you may have to accept the pipe draining back or look at the feasibility of a self priming, flexible impeller pump, rather than a submersible one, with a strum box and NRV on its suction in the bilge.
If that does not work, given the geography of the layout you may have to accept the pipe draining back or look at the feasibility of a self priming, flexible impeller pump, rather than a submersible one, with a strum box and NRV on its suction in the bilge.
mikemonty
Well-Known Member
[ QUOTE ]
And...?
[/ QUOTE ]
AND... therefore NRVs are implicitly discouraged (prohibited is too strong a word) by Rules own instructions.
Personally I AM bothered if on this forum we condone bad practice. OK this is not his primary bilge pump - but someone might set up a pump on the basis of this.
I don't know what the pressure loss equivalent of his 19mm NRV is, but I'm sure it has a significant adverse effect (I did find flow/head graphs for this pump earlier). Anyone watching a pump removing seawater from their boat wants to know that it's taking it out as fast as it can. THEY certainly won't be going /forums/images/graemlins/crazy.gif !
So ASSUMING that the hole doesn't block and leave the pump airlocked
ASSUMING that the head of water above the NRV doesn't make it cavitate
ASSUMING the NRV doesn't jam shut or cause a blockage to form
ASSUMING the hole in the hull is letting in less water than his compromised pump can shift...
he has nothing to worry about.
And...?
[/ QUOTE ]
AND... therefore NRVs are implicitly discouraged (prohibited is too strong a word) by Rules own instructions.
Personally I AM bothered if on this forum we condone bad practice. OK this is not his primary bilge pump - but someone might set up a pump on the basis of this.
I don't know what the pressure loss equivalent of his 19mm NRV is, but I'm sure it has a significant adverse effect (I did find flow/head graphs for this pump earlier). Anyone watching a pump removing seawater from their boat wants to know that it's taking it out as fast as it can. THEY certainly won't be going /forums/images/graemlins/crazy.gif !
So ASSUMING that the hole doesn't block and leave the pump airlocked
ASSUMING that the head of water above the NRV doesn't make it cavitate
ASSUMING the NRV doesn't jam shut or cause a blockage to form
ASSUMING the hole in the hull is letting in less water than his compromised pump can shift...
he has nothing to worry about.
