AC Pump Hose Clamp Failure


A note about the A/C pump:  I was at the dock with two A/C's going and doing some maintenance in the forward cabin when the A/C started cycling as if it weren't getting any cooling water.  I looked at the bilge pump light and it was on steadily.  Quickly shut off the A/C's and looked in the engine room to find water pouring out of the output side of the A/C pump where the 2 stainless hose clamps had failed due to rusting and the hose had popped off.  The bilge pump was keeping up, but water was coming out at a remarkable rate even with the pump off...can't imagine what it looked like with the pump running.  Just about the time that I closed the seacock off, the bilge pump started whining and stopped pumping due to failure of one of the valves.  If I'd been off the boat and just gone for an hour or two, the engine room would have been full and everything in it covered in sea water.
I've also had a hose on the genset pop off due to corroded/broken hose clamps, too.  They break but hold their shape so you can't see there's a problem until the second one breaks and water starts pouring in.  Part of my routine maintenance is now going to be changing the hose clamps on a regular basis.  I'm also going to rethink leaving the boat even for a few hours with the sea cocks open.
Hope this saves someone a serious problem.
SM 243
Currently Brunswick GA

From: Judy and Bill aboard SV BeBe <yahoogroups@...>
To: amelyachtowners@...
Sent: Friday, August 31, 2012 1:52 AM
Subject: [Amel] Re: Calpeda AC Pump


Check the photo at:

Also, the mechanical pump seal and the bearings are easy to replace. Usually, when the seal starts leaking, some salt water ruins the bearing closest to the pump. If you need 1 bearing, replace both of them. If you are not sure about rebuilding the pump, take it to a water-well pump shop or a swimming pool equipment repair facility. The water-well pump shop will be much better. They can rebuild the pump for you...the bearings and seal are standard sizes. If the pump has failed, you probably need a new capacitor...see:
A suitable replacement can be found at most any electrical supply store.

If you are looking to replace the Calpeda: Basic rule of thumb: 1 gallon per minute (GPM) is required for every 4,000 Btu's of capacity.
I believe each of the A/C units are 9,000btu.

9,000 * 3 = 27,000/4,000= 6.75gal/min * 3.785=25.55liters/min * 60 = 1,532 liters/hour....6,75gal/min * 60 = 405gal/hour

I rebuilt our Calpeda in Penang, Malaysia...easily found all of the parts, had a motorcycle repair shop press the new bearings on the shaft.

Hope this helps,

BeBe, SM2k, #387
Currently Eastern Med

--- In, "captain_cucumber_head" <mcerdos@...> wrote:


I am hoping someone can help me with the model number of the blue Calpeda 220vac pump used for salt water cooling of the AC units. The brass plate on my pump is corroded and I am not able to clearly see the specs. This is for a 1999/2000 model SM. Thanks.


Cream Puff
SM #275

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