Water tank breather

[wiggy]

I've fittted a water tank guage that measures the head pressure In the tank. In the instructions it stated that the breather must not be free flowing. Mine seems to have a problem as the guage seems to be erratic and when I remove the tank deck filler cap it sucks in air as its opened. Is there an easy solution? Can I fit an NRV to a T piece near the tank to release any pressure or will this leak? Any other ideas as the existing breatherius really hard to access from about 6" from the tank.

 

[VicS]

I've fittted a water tank guage that measures the head pressure In the tank. In the instructions it stated that the breather must not be free flowing. Mine seems to have a problem as the guage seems to be erratic and when I remove the tank deck filler cap it sucks in air as its opened. Is there an easy solution? Can I fit an NRV to a T piece near the tank to release any pressure or will this leak? Any other ideas as the existing breatherius really hard to access from about 6" from the tank.

I dont understand.
Id have thought for this type of gauge to work correctly the tank must be freely vented but clearly a vacuum is being created in the tank if air is sucked in when the cap is removed.

what guage ?

What type of tank ......... not trying to use a gauge for a normally vented rigid tank with an unvented flexible pillow tank ?????

 

[wiggy]

It's a rigid vented tank. The vent doesn't seem to vent very well though.

 

[PetiteFleur]

The vent must be blocked/hose kinked or somthing similar. My vent hose is 15mm dia to a vent in the cockpit.

 

[VicS]

The vent doesn't seem to vent very well though.

I'd think that was your problem but you say the instructions state that the breather must not be free flowing.

 

[Hydrozoan]

I, too, think you must have a kink or blockage. I fitted a vent pipe to the cockpit coaming in 15mm tubing, and have not encountered any problem.

(I have no experience of pressure head sensors. I used this type of level indicator: http://www.kemo-electronic.de/en/Ho...hp-/M167N-Level-Indicator-for-Water-Tanks.php. For the sensor element, I used a computer ribbon cable with cuts through the insulation of 10 individual strands at appropriate levels. The ribbon, cable-tied to a sealed length of plastic-coated curtain wire, is epoxied through the tank inspection cover. The indicator is inexpensive and there are no moving parts to fail. Not a help to you, but perhaps of interest to others.)

 

[Adamastor]

No offense meant, but an unvented tank sounds daft to me. What will stop your tank from caving in when you run water out of it?

 

[wiggy]

I'd think that was your problem but you say the instructions state that the breather must not be free flowing.

Sorry fat fingers on small keys. Meant to say must be free flowing i.e. no water trap from a sagging pipe.

 

[philip_stevens]

Sorry fat fingers on small keys. Meant to say must be free flowing i.e. no water trap from a sagging pipe.

...then your vent is blocked.

Find out where it is blocked and either replace the hose or water/air blast is clear - disconnect it from the tank first so you don't get a clod of **** in the tank from the vent pipe.