| Plumbing = 1 GMC unit [message #59673] |
Sat, 10 October 2009 20:02  |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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So I decided to replumb the entire coach since the fittings are all splitting and very gross looking. I am using PEX with the plastic fittings that look a bit like a george guest speedfit with the o-ring, but they also have a tightening nut, sorta like a jaco compression fitting. There is a lock tab that prevents it from loostening. Nice. Nice and expensive. I spent about $250 so far to get what I need to replace everyting sans pump and faucets, which I already had. I'm sure I'll need a few more goodies when my newly acquired Water heater I'm getting from Ray arrives. 
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] Plumbing = 1 GMC unit [message #59988 is a reply to message #59987] |
Tue, 13 October 2009 14:04  |
Bmac91724
Messages: 35
Registered: August 2009
Location: Covina CA
Karma: 0
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Aybody know the max temp on the pex? Can you use it to run the engine water to the hot water tank - might reach well over 200 degrees.
Brett Mac Donald
1974 23' Canyon Lands
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| Re: [GMCnet] Plumbing = 1 GMC unit [message #59994 is a reply to message #59988] |
Tue, 13 October 2009 15:24 |
pzerkel
Messages: 212
Registered: September 2007
Location: Salisbury, IL
Karma: 0
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| Bmac91724 wrote on Tue, 13 October 2009 14:04 |
Aybody know the max temp on the pex? Can you use it to run the engine water to the hot water tank - might reach well over 200 degrees.
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It's around 180 degrees F max, so no.
Paul Zerkel
'78 Eleganza II
Salisbury IL (near Springfield)
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| Re: Plumbing = 1 GMC unit [message #60010 is a reply to message #60006] |
Tue, 13 October 2009 18:36 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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He sent it. I told him I wasn't in a hurry.  Unless you want to see roughed in white PEX tubing, there's not much to see. When my polypro fittings from Ryan Herco show up, I'll weld them to the water tank and post photos of that and the pump/box/drain setup. I will also be putting in a separate shower control, but the RV ones turn me off. I may get a nice household single valve type, just not sure how they work with low flow/pressure conditions in an RV. My Anality is what is slowing the whole process down. Cannot do this until I do that, but I want to get a good one, kinda things...
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] Plumbing = 1 GMC unit [message #60103 is a reply to message #60099] |
Wed, 14 October 2009 18:55 |
Tin Gerbil
Messages: 236
Registered: October 2006
Location: Vancouver Island, B.C.
Karma: 0
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Ken;
The local sewer surgeon says crimp Thermapex on any PEX fitting. Put it
in boiling water and then try to pull it apart. He says the pipe will
not fail it is the fittings to be extra careful with. I'm sure you know
they use it for radiant floor heat and they run the pipe directly to the
boiler which runs at 185*F. He says there is a safety factor in the
ratings. He was very reluctant to use Thermapex after having to redo
many houses when they first switched to plastic pipe many years ago. It
was the plastic fittings (not the crimps or pipe) that failed on those
jobs.
My GMC hoses to the house water heater are recent so I'm not going to
change them. When I first got the coach, before I looked at them, I was
going to change them to copper. IIRC standard heater hose is rated at
150 psi.
Please tell me where I might find 25-40 psi in the system? Water is not
compressible so where do I find a 2" rad hose that will take 25-40 psi?
Goodyear GreenStripe with molded SS wire will take it, but I don't
think ordinary rad hose will. We had to limit our pressure to 15 psi
when testing marine heat exchangers because we blew the 2" hoses apart
with any more pressure than that. I wouldn't try putting a pressure
tester on my radiator and giving it 40 psi. I am sure something will
fail. Isn't there a restrictor in the fitting at the manifold to the
hose running to the rear hot water tank?
Thanks;
Gordon
Ken Henderson wrote:
> Wally says 25-40 psi:
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=25033
>
> The 9 psi is only applicable to the radiator cap; at other locations in
> the system, the pressure can be somewhat to a lot higher.
>
> I'd prefer a reinforced hose to any solid material like PEX.
>
> Ken H.
>
> Gordon wrote:
>> PEX comes in many different forms. 180* is at 100 psi. The last
>> ThermaPEX I used was rated for 200*F at 80 psi. I would use it in my
>> GMC when where we ony have 9 psi in the system.
>> Gordon
>>
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Gordon
'74 Canyon Lands "Tin Gerbil"
Vancouver Island, B.C.
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| Re: [GMCnet] Plumbing = 1 GMC unit [message #60117 is a reply to message #60111] |
Wed, 14 October 2009 20:43 |
Tin Gerbil
Messages: 236
Registered: October 2006
Location: Vancouver Island, B.C.
Karma: 0
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Ken;
I understand we can get 40 psi out of a centrifugal pump because this is
what we used for digging clams. I did not know that an automotive pump
could get anywhere near this pressure because there is so much clearance
around the end of the impeller. When our pumps got to 0.025 clearance,
we lost pressure and had to re-sleeve the case. The thermostat must be
closed when these pressures develop. I will see if I can put a pressure
gauge in the line to the house water heater and see what pressure I get
when the engine is cold. I don't think that 40 psi at 220*F will hurt
ThermaPEX. I don't think you will have 40 psi in the heater hose before
or after the thermostat opens and not with 220*F water. Does Wally say
what happens to the pressure when the thermostat is open?
You sure he is not looking at oil pressure? (-:l>
Gordon
Ken Henderson wrote:
> Gordon,
>
> Take a look at the photos in Wally's album. Hard to read the scales,
> even after blowing the photos up, but I trust Wally's readings.
>
> In a dynamic system the pressure can vary widely at different locations
> because of flow past restrictions -- think about the air conditioning
> system. The 9 psi cap's only in charge of controlling the liquid-vapor
> phase change. :-)
>
> Ken H.
>
> Gordon wrote:
>> ...
>> Please tell me where I might find 25-40 psi in the system? Water is not
>> compressible so where do I find a 2" rad hose that will take 25-40 psi? ...
>>> Wally says 25-40 psi:
>>> http://www.gmcmhphotos.com/photos/showphoto.php?photo=25033
>>>
>>> The 9 psi is only applicable to the radiator cap; at other locations in
>>> the system, the pressure can be somewhat to a lot higher.
>>>
>>> I'd prefer a reinforced hose to any solid material like PEX.
>>>
>>> Ken H.
>>>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
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Gordon
'74 Canyon Lands "Tin Gerbil"
Vancouver Island, B.C.
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| Re: Plumbing = 1 GMC unit [message #60119 is a reply to message #59673] |
Wed, 14 October 2009 21:04 |
Chr$
Messages: 2690
Registered: January 2004
Location: Scottsdale, AZ
Karma: 1
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Senior Member |
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The pressures to the water heater cannot be that high, when I took my dead OEM water heater out last weekend, one of the Cu pipes connected to the engine coolant line just broke off. It was severely pitted. I will post photos this weekend if I remember to take any of it...
-Chr$: Perpetual SmartAss
Scottsdale, AZ
77 Ex-Kingsley 455 SOLD!
2010 Nomad 24 Ft TT 390W PV W/MPPT, EV4010 and custom cargo door.
Photosite: Chrisc GMC:"It has Begun" TT: "The Other Woman"
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| Re: [GMCnet] Plumbing = 1 GMC unit [message #60121 is a reply to message #60119] |
Wed, 14 October 2009 21:11 |
Tin Gerbil
Messages: 236
Registered: October 2006
Location: Vancouver Island, B.C.
Karma: 0
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Senior Member |
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Chris;
If you take the lines off the manifold, please check the inside diameter
of the fittings. Someone said there was a restrictor in the system at
that point.
Thanks;
Gordon
Chris Choffat wrote:
>
> The pressures to the water heater cannot be that high, when I took my
> dead OEM water heater out last weekend, one of the Cu pipes connected
> to the engine coolant line just broke off. It was severely pitted. I
> will post photos this weekend if I remember to take any of it...
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Gordon
'74 Canyon Lands "Tin Gerbil"
Vancouver Island, B.C.
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| Re: [GMCnet] Plumbing = 1 GMC unit [message #60122 is a reply to message #60111] |
Wed, 14 October 2009 21:12 |
Tin Gerbil
Messages: 236
Registered: October 2006
Location: Vancouver Island, B.C.
Karma: 0
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Senior Member |
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Ken;
This picture shows the 20 psi very clearly;
http://www.gmcmhphotos.com/photos/showphoto.php?photo=25034
Gordon
Ken Henderson wrote:
> Gordon,
>
> Take a look at the photos in Wally's album. Hard to read the scales,
> even after blowing the photos up, but I trust Wally's readings.
>
> In a dynamic system the pressure can vary widely at different locations
> because of flow past restrictions -- think about the air conditioning
> system. The 9 psi cap's only in charge of controlling the liquid-vapor
> phase change. :-)
>
> Ken H.
>
> Gordon wrote:
>> ...
>> Please tell me where I might find 25-40 psi in the system? Water is not
>> compressible so where do I find a 2" rad hose that will take 25-40 psi? ...
>>> Wally says 25-40 psi:
>>> http://www.gmcmhphotos.com/photos/showphoto.php?photo=25033
>>>
>>> The 9 psi is only applicable to the radiator cap; at other locations in
>>> the system, the pressure can be somewhat to a lot higher.
>>>
>>> I'd prefer a reinforced hose to any solid material like PEX.
>>>
>>> Ken H.
>>>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Gordon
'74 Canyon Lands "Tin Gerbil"
Vancouver Island, B.C.
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| Re: [GMCnet] Plumbing = 1 GMC unit [message #60137 is a reply to message #60121] |
Wed, 14 October 2009 22:12 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Gordon,
When I replaced the intake manifold on Double Trouble I had to make a new
fitting up to supply the dash heat and house hot water heater as I couldn't
get the old one out. I stuck inch size drills into the restrictor and IIRC
the closest was 7/32. It was a bit loose but that suited me as it would cut
down the flow. Having said that I'm probably wrong!
It's easy to check the restrictor size; it is in the base of the fitting in
the right rear part of the intake manifold that feeds the dash heater and
the hoses that go back to the house hot water heater.
Regards,
Rob Mueller
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
'75 Avion - USA - The Parts Coach TZE 365V100324
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Gordon
Sent: Thursday, October 15, 2009 1:11 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Plumbing = 1 GMC unit
Chris;
If you take the lines off the manifold, please check the inside diameter
of the fittings. Someone said there was a restrictor in the system at
that point.
Thanks;
Gordon
Chris Choffat wrote:
>
> The pressures to the water heater cannot be that high, when I took my
> dead OEM water heater out last weekend, one of the Cu pipes connected
> to the engine coolant line just broke off. It was severely pitted. I
> will post photos this weekend if I remember to take any of it...
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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I can always id with red and blue electrical tape, which I already have. I also plan to put a return loop in the system so the cold lead-in water goes back to the main tank.
