I have been thinking about this since Adrian posted, and I also think the Dip Tube would be the way to go. When you are sucking, that vacuum doesn't know the difference between a bottom discharge or a dip-tube, there is liquid there and it is going to suck it. One advantage I can think of in addition to his comment on the leaking at the bottom, is that with a bottom discharge, the hose almost constantly has stinky stuff in it, whereas sucking from the top it only has stinky stuff in it when you suck for a few minutes, then gone. That hose is not likely to emanate as much smell as if it was on the bottom. However, if the rubber seal on the top of the tank is of poor quality as you mention, that could be a problem.
I Would be inclined to use the dip tube, as long as the pickup is around an inch from the bottom. Judging from the way my shop vac sucks water from the bilge, seems like it would clean it out pretty good. Bill Coleman Erie PA -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Matthew L. Wolford via CnC-List Sent: Friday, January 24, 2020 7:38 PM To: cnc-list@cnc-list.com Cc: Matthew L. Wolford Subject: Re: Stus-List Head Tank Replacement. I ask because I’m considering the same issue. My 34 had the same type of tank you described, and Ronco had a direct replacement. I liked the bottom drain because the tank empties by gravity in addition to the pump at pump out. I have been less enamored with the dip tube configuration on my 42. The outlet seems more prone to releasing odor, either because the dip tube is held in place by a rubber gasket or because more sewage is left at the bottom of the tank. Anyone else have any thoughts on this? Sent from my iPhone > On Jan 24, 2020, at 5:16 PM, Adrian Humphreys via CnC-List > <cnc-list@cnc-list.com> wrote: > > Also, there is a lot easier access to the tank top for plumbing in our case. > Working room at the bottom of the vee is very restricted. > > Adrian Humphreys > Telamon Technologies, Inc. > POB 396, Rockport, ME 04856 > 207-763-4691, mobile: 207-542-2312 > adri...@telamontech.com > > > >> On Jan 24, 2020, at 5:09 PM, Adrian Humphreys via CnC-List >> <cnc-list@cnc-list.com> wrote: >> >> With the dip-tube, there is no potential source of leak or weakness at the >> tank bottom. Any leaks around a fitting would be at the tank top and not >> under pressure, so you could caulk. We empty either at the marina pump-out >> or with the diaphragm pump where allowed, so it makes no difference where >> the outlet is when emptying. >> >> Holding tank contents want to stay inside the tank for sure. >> >> Adrian Humphreys >> Telamon Technologies, Inc. >> POB 396, Rockport, ME 04856 >> 207-763-4691, mobile: 207-542-2312 >> adri...@telamontech.com >> >> >> >>> On Jan 24, 2020, at 4:58 PM, Matthew L. Wolford via CnC-List >>> <cnc-list@cnc-list.com> wrote: >>> >>> While on this topic, we did you choose the dip-tube over the bottom drain >>> outlet? >>> >>> Sent from my iPhone >>> >>>> On Jan 24, 2020, at 4:54 PM, Adrian Humphreys via CnC-List >>>> <cnc-list@cnc-list.com> wrote: >>>> >>>> Ronco-Plastics.com >>>> >>>> They have ready-made tooling for a lot of different tanks, and will work >>>> with you to find one that fits your need. Make a dimensioned drawing for >>>> them. The tank is roto-molded when you order, so you can specify the >>>> fittings you want. The original tank under the v-berth on our C&C-33 had >>>> the outlet at the bottom of the vee where it had cracked and leaked. We >>>> specified a "dip-tube" outlet, so all the fittings (inlet, vent, >>>> inspection port, and outlet) are on or near the top. The tank we chose is >>>> a very close match to the original and fits the space well. They will also >>>> create custom tooling, but IIRC, the price estimate started at $2,000+ >>>> >>>> Cost was a little over $300 for our 18 gallon tank and fittings; UPS >>>> shipping from California was almost half that. Rich Gray at Ronco was a >>>> great help. >>>> >>>> We added all new plumbing, larger vent, hand bilge pump to empty it, an >>>> external sensor kit from ferriellosales.com/monitoring-systems.html >>>> ($150.00), and a lot of labor. The Peggy Hall book was essential to the >>>> planning (amazon.com/New-Get-Rid-Boat-Odors/). >>>> >>>> Adrian Humphreys >>>> Epilogue, Rockport ME >>>> C&C 33-2 >>>> adri...@telamontech.com >>>> >>>> >>>> >>>> >>>>> On Jan 24, 2020, at 9:30 AM, John McCrea via CnC-List >>>>> <cnc-list@cnc-list.com> wrote: >>>>> >>>>> Hello. I am in the process of replacing the holding tank on our 1979 C&C >>>>> 36. We bought the boat in 2018 and it had a bladder for a tank under the >>>>> v. I want to go back to the original configuration of the 24-gallon >>>>> plastic tank. I visited a sister ship last weekend and after taking all >>>>> the dimensions, I found the tank on the Kracor website. Kracor no longer >>>>> sells to the public. Through some marine industry connections, I did find >>>>> out that Tartan does have the toolings for that tank but said that be >>>>> prepared to pay a lot for it. As in over $500. Does anyone else know of a >>>>> source for either a custom tank or something similar to the original? >>>>> Thanks! >>>>> >>>>> John McCrea >>>>> Talisman >>>>> Mystic, CT >>>>> _______________________________________________ >>>>> >>>>> Thanks everyone for supporting this list with your contributions. Each >>>>> and every one is greatly appreciated. If you want to support the list - >>>>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>>> >>>> >>>> _______________________________________________ >>>> >>>> Thanks everyone for supporting this list with your contributions. Each >>>> and every one is greatly appreciated. If you want to support the list - >>>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>>> >>> >>> >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each and >>> every one is greatly appreciated. If you want to support the list - use >>> PayPal to send contribution -- https://www.paypal.me/stumurray >>> >> >> >> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each and >> every one is greatly appreciated. If you want to support the list - use >> PayPal to send contribution -- https://www.paypal.me/stumurray >> > > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each and > every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray > _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
