Adhesive to fit a board-foam sandwich for fresh water pump

nigelmercier

nigelmercier

RIP
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20 Jun 2007
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Live in Kent, boat in Canary Islands
www.bavariayacht.info
I've recently bought a new Whale Watermaster FW1215 fresh water pump to replace a less powerful one that my water-obsessed boat partner bought.
http://www.whalepumps.com/marine/pr...NEW-Whale-Watermaster-Automatic-Pressure-Pump

My old pump was mounted on some of the sound absorbent foam used around the engine:
ShurFlo-Pump-6_zps7bd9af68.png~original


As you can see, the screws go all the way through to the panel behind, so the foam does very little. Done properly it should isolate the vibration of the pump from the panel.

My plan is to take out the foam (and re-attach the silver cloth if necessary, or cut out a section) then glue a small plywood board to the front of the foam, and mount the pump on that. My question is: what adhesive should I use on the board/foam/panel?
 
Probably not. I spoke to them for the very same reason and their advice was that if the mount was soft enough not to transmit noise then they would be too soft to support the pump and vice versa. I'm going the same way as you Nigel. I've sandwiched a piece of 25mm closed cell foam between two pieces of ply and will fix one to the bulkhead and the pump to the other. I used SA -90 industrial adhesive https://www.cromwell.co.uk/ACN7328750K and it's holding at the moment but it's only been in use for two days so far!
 
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Nigel,

As an aside, your new Whale pump is rated at 45psi, That looks to be a lot higher than the Shurflow. do you have a calorifier with a pressure relief valve? If so have you checked that the relief valve pressure is higher than 45psi, otherwise it will be constantly blowing off with the new pump.
 
theoldsalt said:
As an aside, your new Whale pump is rated at 45psi, That looks to be a lot higher than the Shurflow. do you have a calorifier with a pressure relief valve? If so have you checked that the relief valve pressure is higher than 45psi, otherwise it will be constantly blowing off with the new pump.
Click to expand...

Good point, I will check. But it wouldn't really matter for a while.

Anyone else got suggestions for an adhesive I can spread between the ply and the foam?
 
nigelmercier said:
My question is: what adhesive should I use on the board/foam/panel?
Click to expand...

Any D4 type polyurethane adhesive will do it, varuous brands eg Joiners Mate or Gorilla Glue. Readily available from the likes of screwfix etc etc
 
I have been thinking about isolating the water pump as well.. The plan I was looking to attempt was to make a frame that would mount to the bulkhead. Then use the rubber doughnuts used to mount car exhausts to mount the pump.. So effectively completely decoupling the pump from any solid/rigid surface.. It's something along the lines of the technique used I used to decouple hard drives in a PC to make them quiet.. This is something commercially available for PC's to give a basic idea.. http://www.silentpcreview.com/files/images/novibe/novibe1.jpg
 
Fixing pump to insulating foam

philwebb said:
Try GRIPFILL solvent version. I used it to mount my insulating panels. It is cheap and sicks well.
Click to expand...
I suggested gripfill but afterwards thought that the rubber mounts are probably a better idea. Unless the foam is quite solid, the weight of the pump
will cause it to tear.
 
Hadenough said:
Probably not. I spoke to them for the very same reason and their advice was that if the mount was soft enough not to transmit noise then they would be too soft to support the pump and vice versa. I'm going the same way as you Nigel. I've sandwiched a piece of 25mm closed cell foam between two pieces of ply and will fix one to the bulkhead and the pump to the other. I used SA -90 industrial adhesive https://www.cromwell.co.uk/ACN7328750K and it's holding at the moment but it's only been in use for two days so far!
Click to expand...

Update! Plywood and contact adhesive was a miserable failure after three days! Mark two version -View attachment 39280
Bits of chopping board (you can still see the scores!) glued to stiff closed cell foam with polyurethane glue. Bit crude but hey! I gave the finished mount serious welly before I installed it and I don't think it will fail. One day in and it is probably 60% quieter. I'll report back
 
Good thought (stored at the back of my mind)but it's done now, nicely tucked out of the way and second day in no sign of the adhesive failing. Much quieter, it's in the centre of the boat and no longer audible in fore or aft cabins which was the objective.
 
Hadenough said:
Bits of chopping board (you can still see the scores!) glued to stiff closed cell foam with polyurethane glue...
Click to expand...

Update from me. It turns out that the existing foam is very soft, and is stuck to a bit of plywood. I've reversed the ply so the foam is against the bulkhead, and for now screwed my 18cm x 22cm base board to it. All the connections to this board are made with flexible hose, rather than the blue Whale stuff. The pump and surge damper are both attached to this smaller board, so all I need is some suitable foam.

Where did you get your foam?
 
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Big problem is gluing a foam to a solid surface that won't delaminate when placed under vibration.
My solution, which is working, is a sandwich of 6mm marine ply stuck to 12mm closed cell polyurethane foam. The adhesive is Screwfix No Nonsense fire rated polyurethane foam which forms a further acoustic barrier and sticks like sh't to the closed cell sheet. Then there is a top 6 mm ply sheet with the mounting bolts inverted and bedded into another layer of the Screwfix foam. The whole sandwich is then screwed to a bulkhead with some polythene tubing shrouding the screws to minimise vibration. It seems to work OK but only time will tell
 
Hadenough said:
Update! Plywood and contact adhesive was a miserable failure after three days! Mark two version -View attachment 39280
Bits of chopping board (you can still see the scores!) glued to stiff closed cell foam with polyurethane glue. Bit crude but hey! I gave the finished mount serious welly before I installed it and I don't think it will fail. One day in and it is probably 60% quieter. I'll report back
Click to expand...

Update. Nearly eight weeks, of daily liveabord use on and it is still holding together. I think I can report a total success!
 
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