| T O P I C R E V I E W |
| ply17410 |
Posted - Apr 07 2012 : 10:49:35
We hit a log last year and it broke the grates on my Perko one piece thru-hull/scoop strainer for the air conditioner. I have removed the strainer assembly and it was quite a chore.
Since this could likely happen again and taking the whole assembly out is a pain, I was thinking of installing a plain thru-hull with a strainer that Groco makes which mounts to a base so it can be taken off, without removing the whole thru-hull.
Does anyone see any problems with doing something like this? Any experience with the Groco or similar strainer like this?
Thanks!
Bob |
| 10 L A T E S T R E P L I E S (Newest First) |
| Flatsflyer |
Posted - Apr 21 2012 : 18:01:13
In most cases where you loose prime, it's caused by th fact that you pump is not low enough in the hull. Drop the pump lower and your problem will go away. AC pumps are not self priming. If you loose prime a simple solution is to put a garden hose into the water outlet and simply "fill" the system. I did that before lowering my CAL pump about 6 inches, my pump is now below the waterline |
| Flatsflyer |
Posted - Apr 21 2012 : 18:00:42
In most cases where you loose prime, it's caused by th fact that you pump is not low enough in the hull. Drop the pump lower and your problem will go away. AC pumps are not self priming. If you loose prime a simple solution is to put a garden hose into the water outlet and simply "fill" the system. I did that before lowering my CAL pump about 6 inches, my pump is now below the waterline |
| ply17410 |
Posted - Apr 19 2012 : 08:32:36
I have decided to just replace the scoop with the same Perko that was on there. It has NPT threads.
Reason for this is a mushroom through-hull would have (NPS) straight pipe threads and requires the installation of a backing flange on the inside of the hull to mate with. The flange then has male (NPT) tapered threads to mate with the shut off valve. All shut offs are NPT.
I did not care to go through the trouble of drilling more holes in the hull to mount the backing flange.
Some manufactures will not do this as specified above. If you google it you will find quite a bit of discussion on the matter.
Bob H
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| PascalG |
Posted - Apr 16 2012 : 06:56:12
If the th is too far forward I can how on plane the pump would by higher than the waterline and have issues pulling water in
If you re going to replace the TH and scoop you should look at screen covers aka south bay strainers. They work and eliminate strainer cleaning which is important on AC pumps that runs a lot. They are also less prone to catching plastic bags |
| rawidman |
Posted - Apr 16 2012 : 06:16:37
quote:
Originally posted by DJ708
When I first installed my AC I was told to use a regular intake , not a scoop. One issue that I experienced with a regular intake is that every time I left the dock the AC pump lost prime/suction, and had to be reprimed.
Later, I was told that this is because the AC pump has no impeller and that it needs a constant stream of water which has to be forced into the system by the grated intake when underway.
Well, my AC water intake has a screen similar to the one shown in the first photo except it has a screen, not slots. The screen is towards the rear.
I think whoever told you the AC pump needs a stream of water forced into the system is confused. My AC works fine at the dock and obviously, the AC water pump is doing all the work.
For the OP, my boat has the seperate strainer covers and they work just fine, no problem. They have a removable screen, not slots but they are the same design other than that. I think the slots are a better choice as long as you have a filter inside the boat. |
| nwaring |
Posted - Apr 16 2012 : 05:47:31
+1 to DJ. I had a regular through hull and I would lose prime every time I ran. Last year I put a scoop on just like you show and the problem went away. The regular through hull also seemed to let more crap get into the filter.
Good luck
Niles
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| DJ708 |
Posted - Apr 15 2012 : 09:14:24
Hi
FWIW
When I first installed my AC I was told to use a regular intake , not a scoop. One issue that I experienced with a regular intake is that every time I left the dock the AC pump lost prime/suction, and had to be reprimed.
Later, I was told that this is because the AC pump has no impeller and that it needs a constant stream of water which has to be forced into the system by the grated intake when underway.
I switched to the scoop intake, and no more problems.
Later I was told that an AC needs a scoop intake, and a generator needs a regular intake not a scoop.
Hope this helps.
DJ
Sand Dollar
1978 Trojan F32
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| Capt. Bill1 |
Posted - Apr 07 2012 : 11:33:37
Oh, I guess I misunderstood and thought it was for a genset. A/C, no problem.
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| ply17410 |
Posted - Apr 07 2012 : 11:08:43
Thanks Capt Bill1,
Regarding slots on the back, the existing is considered a high speed scoop, there are no slots to allow water passage. Since it's on the AC where water being forced into say a generator manifold is not an issue, I'm thinking it would be okay with no further modification.
The shut off is easy to get to, so I suppose I could use that, but never bothered in the past when underway.
Bob |
| Capt. Bill1 |
Posted - Apr 07 2012 : 10:53:56
I've used them and can see no problem with it. Just make sure the back end of the stainer is slotted too so it doesn't act as a scoop when water passes over it.
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