Fresh water piping leak

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Fresh water piping leak

Postby kthurt » Thu Nov 30, 2017 1:49 pm

My water pump was cycling periodically. I found the leak at the hot water tank....thankfully it's not the tank. The leak is between the plastic pipe and the plastic fitting that is threaded onto the hot water tank metal outlet nozzle. So, I need to purchase some pipe and fittings. Does anyone know the brand of piping used? There is no brand or rating printed on the pipe. Also, are special tools required to fit the piping and fittings together?
Ken

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Re: Fresh water piping leak

Postby MyPleasure » Thu Nov 30, 2017 2:44 pm

I believe the fittings are for PEX or Wirsbo pipe....rick
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Re: Fresh water piping leak

Postby rrhopkins » Thu Nov 30, 2017 3:04 pm

My 2002 2465 uses Whale 15mm tubing. I bought it used but it looks like original. I had to replace several fitting to correct my leaks.
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Re: Fresh water piping leak

Postby Chris_in_Texas » Thu Nov 30, 2017 6:55 pm

Look at the PEX pipe for a name. It could be SeaTech as well. Regal likes to use 15mm SeaTech and I am not sure when they started to do so.
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Re: Fresh water piping leak

Postby MyPleasure » Fri Dec 01, 2017 12:29 pm

FYI in the picture in the above post It shows a piece of rubber pipe that I split to put around the PEX tubing because it was rubbing on the sharp metal cover of the hot water tank.....it actually had a groove started on the tubing.
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Re: Fresh water piping leak

Postby kthurt » Sat Dec 02, 2017 1:32 pm

Chris
After a second look I found wording on the red (hot water) piping. It said "Neptune System Sea Pex (maybe it was Sea Flex, bad lighting) 15 mm". I went to the Sea Flex site. I couldn't find any reference to Neptune System, but the fitting looked similar to mine, but I couldn't find the high temp fittings (35 series) in meteric size. I will call them Monday.
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Re: Fresh water piping leak

Postby MyPleasure » Mon Dec 04, 2017 2:17 pm

Question?......Isn't 15mm the same size as 1/2".....just wondering....Rick
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Re: Fresh water piping leak

Postby SGilbert » Mon Dec 04, 2017 3:30 pm

MyPleasure wrote:Question?......Isn't 15mm the same size as 1/2".....just wondering....Rick

No. ½" = 12.5mm
(15mm = .590551 in)
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Re: Fresh water piping leak

Postby kthurt » Mon Dec 04, 2017 4:05 pm

I talked with Seatech and sent him a pic. He said the fittings aren't theirs, as they are white. All their 15mm fittings are black. He said any brand of fitting should work because all 15 mm piping is to the same specs. I believe the reason it's leaking is the strain on the piping....Regal didn't install enough slack. I will probably put a flex hose (Whale has one) on the heater outlet and then install new Whale fittings.
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Re: Fresh water piping leak

Postby gofast24 » Tue Dec 05, 2017 10:57 am

kthurt wrote:I talked with Seatech and sent him a pic. He said the fittings aren't theirs, as they are white. All their 15mm fittings are black. He said any brand of fitting should work because all 15 mm piping is to the same specs. I believe the reason it's leaking is the strain on the piping....Regal didn't install enough slack. I will probably put a flex hose (Whale has one) on the heater outlet and then install new Whale fittings.

Good idea regarding the flex hose although the plastic PEX piping should be able to handle a little movement (or vibration as happens in a boats engine room).
As the 15 mm size designation is a EURO metric standard but not sure if it designates the ID or OD of the tubing? US (SAE/ASME) pipe sizes normally indicate the ID of the pipe or tubing?
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Re: Fresh water piping leak

Postby kthurt » Wed Dec 06, 2017 8:47 am

The metric piping is OD; hence, theoretically any brand fitting should work.....as the Sea Tech stated. Agree, the semi flexible piping will handle some movement, but mine is putting a lot of strain at the point it connects to the heater, and to resolve it would take several fitting and additional piping....and these fitting are expensive, plus my back couldn't handle the additional plumbing reroute. Some of these fitting are only rated up to 150 degrees. My heater doesn't having a mixing valve downstream, so they will see at least 165 deg, but hopefully that will only lower the pressure rating, which should still be above my operating pressures. Guess I will find out.
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Re: Fresh water piping leak

Postby gofast24 » Wed Dec 06, 2017 11:25 am

kthurt wrote:The metric piping is OD; hence, theoretically any brand fitting should work.....as the Sea Tech stated. Agree, the semi flexible piping will handle some movement, but mine is putting a lot of strain at the point it connects to the heater, and to resolve it would take several fitting and additional piping....and these fitting are expensive, plus my back couldn't handle the additional plumbing reroute. Some of these fitting are only rated up to 150 degrees. My heater doesn't having a mixing valve downstream, so they will see at least 165 deg, but hopefully that will only lower the pressure rating, which should still be above my operating pressures. Guess I will find out.

Dont you have a thermostat on the tank (for the electric heating element control temperature) that you can adjust the water temperature? 165F is in the range of seriously scalding some one that accidentally comes in contact with that temperature water! Also, do you not have a temp/pressure relief valve on the tank that will blow off if excessive temp or pressure?
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Re: Fresh water piping leak

Postby kthurt » Wed Dec 06, 2017 12:19 pm

I've never seen an adjustment, but because the tank is also heated by engine cooling water, the temp is going to run high....that's where I came up with 165 deg, engine thermostat temp. I guess that's why some systems have a mixing valve to mix cool water with heater outlet. Your right about scalding, but my kids are long gone. The high temperature does help provide more hot water capacity when taking showers.
Yes, the heater has a relief valve. It's a Whale Seaward 6 gal.
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Re: Fresh water piping leak

Postby gofast24 » Thu Dec 07, 2017 12:32 pm

kthurt wrote:I've never seen an adjustment, but because the tank is also heated by engine cooling water, the temp is going to run high....that's where I came up with 165 deg, engine thermostat temp. I guess that's why some systems have a mixing valve to mix cool water with heater outlet. Your right about scalding, but my kids are long gone. The high temperature does help provide more hot water capacity when taking showers.
Yes, the heater has a relief valve. It's a Whale Seaward 6 gal.

Agree with the 165 F assumption as our port engine also sends jacket water to a HE coil in the tank. This also requires the port engine to take much longer to come up to operating temperature on a cold engine/cold hot water tank as some of the heat generated by the engine is being transferred to the hot water tank. Still don't like having 165F hot water anywhere but not much we can do about it on a boat unless a down stream mixing valve is installed. You would think there would be some code requiring hot water temps to be limited or adjusted to 120/140F max.? The only plus here is if you loose sea water to that engines heat exchanger the hot water tank takes some of the heat away for a few minutes until the high jacket water temp alarm sounds (but not too good for the sea water cooled exhaust system).
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