My holding tank is mounted almost directly behind, and slightly to the left of my Raritan PHII manual head, behind a bulkhead. The discharge hose connecting the head to the tank makes a circular route, making a 90 degree right angle coming out of the head to the side of the boat, where it makes a 90 degree left angle to run along the side of the hull for one foot or so, and then another 90 degree left angle to run back, past the head and on to the top of the holding tank. This turns what could be a run of about four feet if I took the shortest route to the holding tank into a length of about eight feet. Since this routing is more difficult and more expensive for the boat builder, my initial instinct is that it must have been done for an important purpose or else why would the builder do it. If I route the hose in the most direct route, it would have to travel nearly verticle to get to the top of the tank. Either way, the waste must travel the same vertical distance. Would the indirect route result in less back-pressure on the joker valve because the rise was more gradual? Is there some formula or law of physics that calculates an optimal hose layout?
Is angle of incline important in routing hose?
- Thread starter Jack B19779
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Take the shorter route...
I'm often left wondering what boat builders were thinking when they installed sanitation systems...if in fact they gave it any thought. Here's what to do: go straight up from the toilet to a loop that's a little higher than the top of the tank, then down to the tank. That'll give you the shortest uphill run from the toilet...not THE shortest, but one that your PH II can easily push bowl contents over in the dry mode. You'll need a 90 discharge fitting on the toilet, a 180 loop (doesn't have to be vented, but vented may be easier to find), and a 90 tank fitting.
I'm often left wondering what boat builders were thinking when they installed sanitation systems...if in fact they gave it any thought. Here's what to do: go straight up from the toilet to a loop that's a little higher than the top of the tank, then down to the tank. That'll give you the shortest uphill run from the toilet...not THE shortest, but one that your PH II can easily push bowl contents over in the dry mode. You'll need a 90 discharge fitting on the toilet, a 180 loop (doesn't have to be vented, but vented may be easier to find), and a 90 tank fitting.
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