Holding tank vent

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bcassedy
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Holding tank vent

Postby bcassedy » Tue Feb 14, 2017 12:49 pm

I'm putting in a new waste (head) water holding tank system. I've determined that a Moeller 20gal tank will fit in the forward berth area. That area is divided by PO into an upper section (nearest to the bow) and a lower section (nearest the bulkhead in the 'dressing area'. It is that lower area where the 20gal tank will fit/be located.

I need to run a vent line from the new tank and had anticipated using a Shield's 5/8" sanitation hose. Where I'm a bit stymied is what type of vent fitting to place in the hull, just under the gunwale on the starboard hull.
- Anyone have any suggestions on vent type? I'm looking at a Perko 90 deg gas tank vent but that has a zinc alloy body and that concerns me - potential corrosion issues<?>.
- Should there be some type of charcoal cartridge in the vent line?
- Other considerations?

Thx,
Bill
Bill & Sharon Cassedy
"Sunset Seeker"
'88 32' Sedan Bridge
Located in Aurora, In.
Twin 318cu in Chrysler
1.5:1 Velvet drive trannies
Fresh water only

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carl
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Re: Holding tank vent

Postby carl » Tue Feb 14, 2017 1:04 pm

Hello Bill,
I searched and found these references for you, the filter fits inline (read the reviews) and the vent is a non-metallic Marelon by Forespar. Keeping everything 5/8" ID for you. One 3/4" hole, the correct hose and some new hoses clamps and this looks like it would work great. Additionally go as high as you can in the space under the V-Berth but no need to go as high as the Starboard gunwale. Additionally I found many good diagrams of Black Water waste systems online detailing the circuit, worth a Google search.

https://www.westmarine.com/buy/sealand- ... P000447144
http://www.forespar.com/products/boat-m ... plug.shtml
1990 Marinette 32' Sedan Fly Bridge "IKOI"
Twin Crusader 350's (Closed Loop Cooling)
Bow to Stern Full On Restoration in Progress
Chickamauga Lake, Tennessee
A boat is always safe at shore, but that's not what its built for...

ddependo
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Re: Holding tank vent

Postby ddependo » Tue Feb 14, 2017 3:22 pm

Carl, Marinette did not come w a wast line filter,but I can show you how to make a serviceable filter. I've made lots of them for the boats at our marina .
Wayne
1973 32 express fly bridge
Chattanooga
"Southern Lady"

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carl
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Re: Holding tank vent

Postby carl » Tue Feb 14, 2017 3:35 pm

Hello Wayne,
Thank You for the offer but my Marine Sanitation Device is installed and the work on my system is complete. See Bill's post above, he was interested in the waste line filters.
Last edited by carl on Tue Feb 14, 2017 10:22 pm, edited 2 times in total.
1990 Marinette 32' Sedan Fly Bridge "IKOI"
Twin Crusader 350's (Closed Loop Cooling)
Bow to Stern Full On Restoration in Progress
Chickamauga Lake, Tennessee
A boat is always safe at shore, but that's not what its built for...

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bcassedy
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Posts: 213
Joined: Sun Jul 13, 2014 10:05 am
Location: Aurora, In.
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Re: Holding tank vent

Postby bcassedy » Tue Feb 14, 2017 4:12 pm

Carl,
Great find on the Forespar vent fitting!

Wayne,
I appreciate the offer!

Bill
Bill & Sharon Cassedy
"Sunset Seeker"
'88 32' Sedan Bridge
Located in Aurora, In.
Twin 318cu in Chrysler
1.5:1 Velvet drive trannies
Fresh water only

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carl
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Posts: 176
Joined: Sun Feb 08, 2015 5:58 pm

Re: Holding tank vent

Postby carl » Tue Feb 14, 2017 10:27 pm

Bill,
Because this vent is a "Pop In" design I would purchase a small piece of 1/8" thick aluminum, drill the 3/4" hole in it and test fit the Forspar Marelon vent fitting to verify it fits tight enough to meet your expectations, I would want it to fit firmly with no movement. If you go with it let us know how they fit please. Once I pull my fuel tanks I am considering using these vents as replacements for the metal ones that are in there now but need to pull the old ones first and measure the hole as it needs to be 3/4" and I'm not sure what size holes are in my hull at this time.
1990 Marinette 32' Sedan Fly Bridge "IKOI"
Twin Crusader 350's (Closed Loop Cooling)
Bow to Stern Full On Restoration in Progress
Chickamauga Lake, Tennessee
A boat is always safe at shore, but that's not what its built for...

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bcassedy
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Posts: 213
Joined: Sun Jul 13, 2014 10:05 am
Location: Aurora, In.
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Re: Holding tank vent

Postby bcassedy » Thu Feb 16, 2017 11:02 am

Carl (et al)... ;)
I've got all the primary pieces (tank, waste line, vent line, deck fitting, monitoring system, and vent fitting) ordered. Everything else is Lowes / Menards purchase (including how to make a vent line charcoal filter). My thanks to FastJeff who some time back (post WWII - pre 2011 elections... :D ) posted on the old site (?) how he had secured a waste tank which will help immensely.

I have some scrap aluminum around the house which is about 3/16" thick. I'll use that for the Forespar vent. If it's not rigid/secure enough, I'll use that piece of scrap and epoxy it to the hull to "build up" the thickness. PC-11 is great for this. Will keep all advised.

Bill
Bill & Sharon Cassedy
"Sunset Seeker"
'88 32' Sedan Bridge
Located in Aurora, In.
Twin 318cu in Chrysler
1.5:1 Velvet drive trannies
Fresh water only


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