Joe offers his aftermarket design for a holding tank. (Pictures are expandable) |
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HOLDING TANK
1969 PEARSON 35 THE TANK I CHOSE WAS A "TOUGH TANK" BY SEALAND© (#316403000,SHIPPING WT 38#). WEST MARINE #410894 $230. Probably less direct from SEALAND©). THE TANK COMES EQUIPPED WITH INLET AND OUTLET PIPES MOLDED IN, PLUS AN INSPECTION PLATE WITH A VENT HOSE CONNECTION. IT IS THE LARGEST TANK I COULD FIT INTO THE ALLOTTED SPACE AND STILL HAVE ROOM FOR THE PUMP, VALVES AND PLUMBING. 30 X 20 X 12H. NOTE: WINDSTAR has an "A" berth not a "V" berth (the space between the forward bunks is permanently closed with storage below).
1) HOLDING 28 GALS OF WASTE ON BOARD, 2) HAVING THE TANK EMPTIED AT A PUMP OUT STATION, 3) PUMPING THE WASTE OVERBOARD (IF YOU ARE AT SEA).
IN SOME CASES A SMALLER HARD TANK OR A BLADDER TANK MIGHT BE MORE APPROPRIATE FOR YOUR BOAT. IF A BLADDER TANK IS USED - A VENT IS NOT NECESSARY. MAKE SURE YOU HAVE ENOUGH ROOM FOR THE TANK AND THE PLUMBING FOR GOOD ACCESS TO THE FITTINGS - YOU MAY HAVE TO WORK ON THEM.
THE WHITE HOSE AT THE TOP OF THE PHOTO A IS NOT PART OF THE WASTE PLUMBING. IT'S A FILL HOSE FOR THE FORWARD FRESH WATER TANK THAT RUNS ADJACENT TO THE HOLDING TANK.
THE SMALL BLACK HOSE TO THE RIGHT IN PHOTO A, IS THE VENT HOSE WHICH RUNS FROM THE INSPECTION PLATE ON THE TOP OF THE TANK THROUGH THE CHAIN LOCKER BULKHEAD AND THEN TO A THRU HULL BREATHER.
THE THRU HULL BREATHER, (PERKO #503DP3CHR0 - WM# 256479, $25) IS SHOWN IN PHOTO C.
THE VENT HOSE THRU HULL BREATHER IS MOUNTED ON THE SIDE OF THE HULL JUST BELOW THE TOE RAIL. IT COMES WITH A BUILT IN SCREEN TO PREVENT BUGS FROM ENTERING THE FIXTURE.
ROUTING THE PLUMBING
USE HOSES DESIGNED SPECIFICALLY FOR WASTE TO PREVENT ODORS AND IF POSSIBLE AVOID SHARP TURNS OR THE USE OF "L" FITTINGS. I HAD TO USE SOME "L" FIXTURES TO FIT MY SYSTEM IN THE LIMITED SPACE I HAD.
Reference the above drawing HOSE #1 = FROM THE HEAD THROUGH THE ANTI-SIPHON VALVE TO THE INLET OF "Y" VALVE # 1
HOSE #2 = FROM "Y" AN OUTLET VALVE # 1 TO THE INLET (TOP) PIPE ON THE HOLDING TANK.
HOSE #3 = FROM THE OUTLET (LOWER) PIPE OF THE HOLDING TANK TO THE INLET OF "Y" VALVE #2.
HOSE #4 = FROM AN OUTLET OF "Y" VALVE #2 TO THE DECK PLATE LABELED "WASTE".
NOTE: IF POSSIBLE LOCATE THE WASTE DECK PLATE ON THE OPPOSITE SIDE OF THE CABIN FROM THE WATER FILL DECK PLATE.
HOSE #5 = FROM THE UNUSED OUTLET OF "Y" VALVE #1 THROUGH A "T" TO THE SEACOCK AND THRU HULL.
HOSE #6 = FROM THE UNUSED OUTLET OF "Y" VALVE #2 TO THE INLET OF THE PUMP
I USED A WHALE GUSHER #10 PUMP, HAND OPERATED. AN ELECTRIC PUMP COULD BE AN OPTION HERE.
WHEN MOUNTING A HAND PUMP BE SURE YOU HAVE ROOM TO OPERATE THE PUMP HANDLE.
HOSE #7 = FROM THE OUTLET OF THE PUMP TO THE "T" IN HOSE #5.
MOUNTING THE TANK
A CUSTOM BUILT SHELF SUPPORTS THE TANK ON THE AFT SIDE BY THE DRESSER BULKHEAD AND FORWARD BY A CUSTOM "TABLE LEG" WHICH IS SCREWED TO THE SOLE AND EPOXY TO THE SIDE OF THE HULL.
IF YOUR BOAT HAS A "V" BERTH YOU WILL PROBABLY HAVE ANOTHER MOUNTING SURFACE AMIDSHIPS, BUT YOU WILL HAVE LESS ACCESS TO THE PLUMBING.
THE PORT SIDE OF THE SHELF IS FIBER GLASSED TO THE SIDE OF THE HULL. THE TANK IS HELD TO THE SHELF BY STRAPS.
-- HiTides, Joe
Additional Pictures
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