Cruising Sailors Forum Archive
Thin gravity holding tank question
Next on the refit list is moving the location of our holding tank. The plan is to mount a 5 or 6 inch deep by 30" wide by 40" tall tank on the bulkhead in the head. That will allow a PVC 45 in 1 1/2" to go to the through hull. How narrow can a holding tank be before sh*t stops flowing?
Messages In This Thread
- Thin gravity holding tank question
- That tank will have a lot of pressure on it from the 40" of "head" pressure
- And you will have to pump up hill from the head to the top of the tank.
- You should pump up to a vacume breaker that is high anyway. You don't want to have the tank siphon back into the head.
- I checked with Raritan and they said I would pump up with no problem
- Not really...
- The sides of the tank have to thicker or reinforced more heavily to handle the deeper tank.
- It empties by opening the seacock and flowing into the sea
- And you will have to pump up hill from the head to the top of the tank.
- I think he means that he won't pump the tank out, he'll just open a valve and it will drain into the 3 miles offshore...
- We have a gravity tank like you describe, butlarger
- What I suggest is...
- That tank will have a lot of pressure on it from the 40" of "head" pressure
