Need to install a complete holding tank system...have no model-is there a design/schematic available for purchase? Is stainless recommended for tank? I'd rather shell out for the least problematic option. many many thanx!
bushstream@yahoo.com
cd30 head
Moderator: Jim Walsh
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Craig Curtis
Re: cd30 head
Will,
This West Advisor page might be a good starting point for you to commence evaluating your options.
Craig Curtis
Cape Dory 40 "Coalescence"
Craig_Curtis@prusec.com
This West Advisor page might be a good starting point for you to commence evaluating your options.
Craig Curtis
Cape Dory 40 "Coalescence"
Craig_Curtis@prusec.com
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Mario
Re: cd30 head
There's a schematic of sorts in the Cape Dory manual available on this site. Our mechanic is changing our system over from the dual overboard discharge/holding tank system to a straight holding tank system, since we don't plan on doing any bluewater sailing in it and we have ready access to pumpouts. Also, check the West Catalog's plumbing section for info on head systems.
Mario
capedory252NOSPAM@aol.com
Mario
will bent wrote: Need to install a complete holding tank system...have no model-is there a design/schematic available for purchase? Is stainless recommended for tank? I'd rather shell out for the least problematic option. many many thanx!
capedory252NOSPAM@aol.com
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Ken Coit
Not Stainless
Just in case no one else tells you, stainless is the worst material you can use for a holding tank. It will rust through in a few years. If you need references, I will find them, but I suspect someone who can explain the chemistry will also point this out.
Keep on sailing,
Ken Coit
CD/36 Parfait
Hailing Port: Raleigh, NC
Sailing from: Beaufort, NC
parfaitNOSPAM@nc.rr.com
Keep on sailing,
Ken Coit
CD/36 Parfait
Hailing Port: Raleigh, NC
Sailing from: Beaufort, NC
will bent wrote: Need to install a complete holding tank system...have no model-is there a design/schematic available for purchase? Is stainless recommended for tank? I'd rather shell out for the least problematic option. many many thanx!
parfaitNOSPAM@nc.rr.com
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Larry DeMers
Re: Not Stainless
Ken's spot on.
S.S. is lousy underwater. It is horrible in a holding tank because the bacteria eat up a lot of the dissolved oxygen, which then stops the replenishing of the S.S. oxidation coating that protects it's surface from outside chemicals, and sewage qualifies as a mess-o-chemicals I think. Then the surface oxide gets washed off, and the chemicals form crevice corrosion in the S.S., which eats right into it.
An experiment you can try at home: Put a wide rubber band tightly around a piece of prop shaft, and dump it in the briny for a while..few weeks to a month. Under the rubber band, it will have corroded in a pock marked ring all around the shaft, with the holes being as deep as they are wide. This is what will happen to a S.S tank. The stuff is also brittle, and would be subject to stress fracture I bet.
Cape Dory used linear polyurethane tanks that were rotomolded. I think Kracor (?) is the dealer now. They would have a close shape I bet, although there is that v shaped cut away in the front lower surface. A few years back, someone on here was looking to get a few of us together to go in on getting new tanks made..spreading the setup charges over the whole order. You might find something on it in the archives under 'holding tank'.
Good Luck!
Larry DeMers
s/v DeLaMer
Cape Dory 30
LAke Superior
demers@sgi.com
S.S. is lousy underwater. It is horrible in a holding tank because the bacteria eat up a lot of the dissolved oxygen, which then stops the replenishing of the S.S. oxidation coating that protects it's surface from outside chemicals, and sewage qualifies as a mess-o-chemicals I think. Then the surface oxide gets washed off, and the chemicals form crevice corrosion in the S.S., which eats right into it.
An experiment you can try at home: Put a wide rubber band tightly around a piece of prop shaft, and dump it in the briny for a while..few weeks to a month. Under the rubber band, it will have corroded in a pock marked ring all around the shaft, with the holes being as deep as they are wide. This is what will happen to a S.S tank. The stuff is also brittle, and would be subject to stress fracture I bet.
Cape Dory used linear polyurethane tanks that were rotomolded. I think Kracor (?) is the dealer now. They would have a close shape I bet, although there is that v shaped cut away in the front lower surface. A few years back, someone on here was looking to get a few of us together to go in on getting new tanks made..spreading the setup charges over the whole order. You might find something on it in the archives under 'holding tank'.
Good Luck!
Larry DeMers
s/v DeLaMer
Cape Dory 30
LAke Superior
Ken Coit wrote: Just in case no one else tells you, stainless is the worst material you can use for a holding tank. It will rust through in a few years. If you need references, I will find them, but I suspect someone who can explain the chemistry will also point this out.
Keep on sailing,
Ken Coit
CD/36 Parfait
Hailing Port: Raleigh, NC
Sailing from: Beaufort, NC
will bent wrote: Need to install a complete holding tank system...have no model-is there a design/schematic available for purchase? Is stainless recommended for tank? I'd rather shell out for the least problematic option. many many thanx!
demers@sgi.com
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John R.
Correction
Sorry Larry that's incorrect; Kracor Industries (original supplier to CD) tanks are and were roto-molded using HDPE plastic (high density polyethelene) not "linear polyurethane". Paints are made of "linear polyurethane" not tanks. Ports in the tanks are spin welded (by friction) into the tank walls. Kracor is not the only company that makes roto-molded HDPE tanks, there are several others also. Kracor made the original tanks for the CD30 and I have copies of the original engineering drawings for Cape Dory with material specifications and dimensions.
Check the archives for my original posting on the CD30 holding tank and associated messages for more reading about the tanks.
Ken's spot on.
Check the archives for my original posting on the CD30 holding tank and associated messages for more reading about the tanks.
Ken's spot on.
Larry DeMers wrote: S.S. is lousy underwater. It is horrible in a holding tank because the bacteria eat up a lot of the dissolved oxygen, which then stops the replenishing of the S.S. oxidation coating that protects it's surface from outside chemicals, and sewage qualifies as a mess-o-chemicals I think. Then the surface oxide gets washed off, and the chemicals form crevice corrosion in the S.S., which eats right into it.
An experiment you can try at home: Put a wide rubber band tightly around a piece of prop shaft, and dump it in the briny for a while..few weeks to a month. Under the rubber band, it will have corroded in a pock marked ring all around the shaft, with the holes being as deep as they are wide. This is what will happen to a S.S tank. The stuff is also brittle, and would be subject to stress fracture I bet.
Cape Dory used linear polyurethane tanks that were rotomolded. I think Kracor (?) is the dealer now. They would have a close shape I bet, although there is that v shaped cut away in the front lower surface. A few years back, someone on here was looking to get a few of us together to go in on getting new tanks made..spreading the setup charges over the whole order. You might find something on it in the archives under 'holding tank'.
Good Luck!
Larry DeMers
s/v DeLaMer
Cape Dory 30
LAke Superior
Ken Coit wrote: Just in case no one else tells you, stainless is the worst material you can use for a holding tank. It will rust through in a few years. If you need references, I will find them, but I suspect someone who can explain the chemistry will also point this out.
Keep on sailing,
Ken Coit
CD/36 Parfait
Hailing Port: Raleigh, NC
Sailing from: Beaufort, NC
will bent wrote: Need to install a complete holding tank system...have no model-is there a design/schematic available for purchase? Is stainless recommended for tank? I'd rather shell out for the least problematic option. many many thanx!
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John Nuttall
John R built an epoxy tank for his CD30....
......and he has pictures of the process too.....
John
s/v Aimless
CD31 #28
s/v ???
CD10 #???
Oriental, NC
John
s/v Aimless
CD31 #28
s/v ???
CD10 #???
Oriental, NC
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John R.
Re: John R built an epoxy tank for his CD30....
Yes John is correct,I did build one. Will if you are interested in the concept of building one I can send you some photos of the tank I constructed for reference.John Nuttall wrote: ......and he has pictures of the process too.....
John
s/v Aimless
CD31 #28
s/v ???
CD10 #???
Oriental, NC
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Joe Mac Phee
Re: cd30 head holding tank
Will,
The holding tank system you wish to build can be be built from catalog items except for the holding tank. My CD-30 came originally with a (recirculating) 6 gallon holding tank and a much larger water tank (25 gallon?) in the v berth area. I redesigned the arrangement by installing a new large holding tank and a small 6 gallon water tank. If you plan to put the holding tank under the v berth, it is available from both Kracor and Ronco. A group purchase was made last year from Ronco for the custom v shaped tank. The group price ws $85.00. My understanding was that the price was determined because of the group order and resultant reduced set-up costs.
Ronco Plastics
15022 Parkway Loop #B
Tustin, CA 92680
The owners manual for my boat shows a schematic for the plumbing. However, you may have to engineer your own schematic depending on your anticipated use of the boat and the area in which it will be sailed. Issues are no-discharge areas, off shore areas, availability of pump out locations. My system accomodates no discharge areas and can be pumped out from the deck. There is also provision for direct discharge to the sea where appropriate as well as emptying the tank through the thru-hull where allowed. There is also provision for fresh water or salt water flush. It is only slightly more complicated than a small nuclear reactor.
In order to be a Plumber, you need to know 3 things
1. S**t does not go uphill
2. Cold is on the right
3. Friday is payday
Happy flushing,
Joe Mac Phee
S/V Iolanthe
CD-30/K
Bristol RI
jvmacphee@aol.com
The holding tank system you wish to build can be be built from catalog items except for the holding tank. My CD-30 came originally with a (recirculating) 6 gallon holding tank and a much larger water tank (25 gallon?) in the v berth area. I redesigned the arrangement by installing a new large holding tank and a small 6 gallon water tank. If you plan to put the holding tank under the v berth, it is available from both Kracor and Ronco. A group purchase was made last year from Ronco for the custom v shaped tank. The group price ws $85.00. My understanding was that the price was determined because of the group order and resultant reduced set-up costs.
Ronco Plastics
15022 Parkway Loop #B
Tustin, CA 92680
The owners manual for my boat shows a schematic for the plumbing. However, you may have to engineer your own schematic depending on your anticipated use of the boat and the area in which it will be sailed. Issues are no-discharge areas, off shore areas, availability of pump out locations. My system accomodates no discharge areas and can be pumped out from the deck. There is also provision for direct discharge to the sea where appropriate as well as emptying the tank through the thru-hull where allowed. There is also provision for fresh water or salt water flush. It is only slightly more complicated than a small nuclear reactor.
In order to be a Plumber, you need to know 3 things
1. S**t does not go uphill
2. Cold is on the right
3. Friday is payday
Happy flushing,
Joe Mac Phee
S/V Iolanthe
CD-30/K
Bristol RI
jvmacphee@aol.com
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Glen
alternative to Kracor holding tank
Some CD30's had a 24 gallon holding tank installed under the V-berth...a very odd V shape. I have a schematic I can e-mail to you if you want.
enter: ronco
in the search at the top of the bboard page.
I've been very satisfied with holding tank made by Ronco Plastics. They also placed the ports where I specified...Kracor would not.
glen@cambio.acomp.usf.edu
enter: ronco
in the search at the top of the bboard page.
I've been very satisfied with holding tank made by Ronco Plastics. They also placed the ports where I specified...Kracor would not.
glen@cambio.acomp.usf.edu
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Larry DeMers
Re: Correction..
John,
Thanks for setting that straight. I mixed up linear polyurethane and H.D. polyethelene. By the way, I did not claim that Kracor was the only producer of tanks..only that they produced our Cape Dory tanks.
Larry DeMers
demers@sgi.com
Thanks for setting that straight. I mixed up linear polyurethane and H.D. polyethelene. By the way, I did not claim that Kracor was the only producer of tanks..only that they produced our Cape Dory tanks.
Larry DeMers
John R. wrote: Sorry Larry that's incorrect; Kracor Industries (original supplier to CD) tanks are and were roto-molded using HDPE plastic (high density polyethelene) not "linear polyurethane". Paints are made of "linear polyurethane" not tanks. Ports in the tanks are spin welded (by friction) into the tank walls. Kracor is not the only company that makes roto-molded HDPE tanks, there are several others also. Kracor made the original tanks for the CD30 and I have copies of the original engineering drawings for Cape Dory with material specifications and dimensions.
Check the archives for my original posting on the CD30 holding tank and associated messages for more reading about the tanks.
Ken's spot on.
Larry DeMers wrote: S.S. is lousy underwater. It is horrible in a holding tank because the bacteria eat up a lot of the dissolved oxygen, which then stops the replenishing of the S.S. oxidation coating that protects it's surface from outside chemicals, and sewage qualifies as a mess-o-chemicals I think. Then the surface oxide gets washed off, and the chemicals form crevice corrosion in the S.S., which eats right into it.
An experiment you can try at home: Put a wide rubber band tightly around a piece of prop shaft, and dump it in the briny for a while..few weeks to a month. Under the rubber band, it will have corroded in a pock marked ring all around the shaft, with the holes being as deep as they are wide. This is what will happen to a S.S tank. The stuff is also brittle, and would be subject to stress fracture I bet.
Cape Dory used linear polyurethane tanks that were rotomolded. I think Kracor (?) is the dealer now. They would have a close shape I bet, although there is that v shaped cut away in the front lower surface. A few years back, someone on here was looking to get a few of us together to go in on getting new tanks made..spreading the setup charges over the whole order. You might find something on it in the archives under 'holding tank'.
Good Luck!
Larry DeMers
s/v DeLaMer
Cape Dory 30
LAke Superior
Ken Coit wrote: Just in case no one else tells you, stainless is the worst material you can use for a holding tank. It will rust through in a few years. If you need references, I will find them, but I suspect someone who can explain the chemistry will also point this out.
Keep on sailing,
Ken Coit
CD/36 Parfait
Hailing Port: Raleigh, NC
Sailing from: Beaufort, NC
demers@sgi.com