Hippocampus
Guru
- Joined
- Jul 27, 2020
- Messages
- 4,182
- Location
- Plymouth
- Vessel Name
- Hippocampus
- Vessel Make
- Nordic Tug 42
Have trouble pumping out. Doesn’t matter if shore based system or pump out boat.
Overboard works perfectly. Empties tank in <5 minutes completely. Few air bubbles at start for <5-10 sec then just overboard flow. Pump out via deck fitting is either no flow or anemic flow with short bursts of good flow until 1/2 empty. Then no flow.
Can hear air flow in vent if listen closely.
System is fiberglass nipple on top of fiberglass tank. Reaching into tank can feel tube down to bottom. From nipple hose to Tee fitting. From Tee one hose to overboard through hull. Other arm to deck fitting. Originally there’s e was a mix of multiple right angle bends, hose and pvc pipe. Thought there were air leaks so took that run out completely and replaced with a single run of new sanitation hose (1 1/2”). No right angles rather more gradual bends and only connections are to tank pick up and deck fitting and the Tee which I replaced. All doubled clamped with new SS hose clamps. Can’t hear any air leaks anywhere.
Still normal great emptying via overboard and no emptying via deck pump out. Run to through maybe 3’. Run to deck fitting maybe 10-11’.
This one has me stumped. Not behaving like a clogged vent and took off plate for tank tender while pumping out which made no difference. Don’t think it’s a clog as all new hose and fittings except deck fitting which looks just fine. Also both overboard and deck pump out use the same pick up tube. Had trouble with attempts at different places so don’t think it’s due to poor pump out stations. Have no idea what’s going on. Going pass 3m every time is not a good solution.
Any thoughts on what I’m missing?
Overboard works perfectly. Empties tank in <5 minutes completely. Few air bubbles at start for <5-10 sec then just overboard flow. Pump out via deck fitting is either no flow or anemic flow with short bursts of good flow until 1/2 empty. Then no flow.
Can hear air flow in vent if listen closely.
System is fiberglass nipple on top of fiberglass tank. Reaching into tank can feel tube down to bottom. From nipple hose to Tee fitting. From Tee one hose to overboard through hull. Other arm to deck fitting. Originally there’s e was a mix of multiple right angle bends, hose and pvc pipe. Thought there were air leaks so took that run out completely and replaced with a single run of new sanitation hose (1 1/2”). No right angles rather more gradual bends and only connections are to tank pick up and deck fitting and the Tee which I replaced. All doubled clamped with new SS hose clamps. Can’t hear any air leaks anywhere.
Still normal great emptying via overboard and no emptying via deck pump out. Run to through maybe 3’. Run to deck fitting maybe 10-11’.
This one has me stumped. Not behaving like a clogged vent and took off plate for tank tender while pumping out which made no difference. Don’t think it’s a clog as all new hose and fittings except deck fitting which looks just fine. Also both overboard and deck pump out use the same pick up tube. Had trouble with attempts at different places so don’t think it’s due to poor pump out stations. Have no idea what’s going on. Going pass 3m every time is not a good solution.
Any thoughts on what I’m missing?
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