Lee Sanitation, holding tanks and hose knitting
- Thread starter Graham_Wright
- Start date
mikemonty
Well-Known Member
Like I said - a simple spool either in a variety of sizes or with shims. a central bore and two, three or more axial splits so it can expand - the whole lot held loosely together. maybe by an external groove with a spring or elastic in it.
a threaded bolt through the bore to a cone or bullet shaped fitting at the INNER end of the spool with a diameter going from slightly smaller than the spool bore to however much diametral expansion you think you can get away with (that goes down the pipe you want to expand).
The expander assembly goes into the bore of the pipe
As the bolt is turned the cone is drawn up through the bore thus expanding the spool and the pipe.
The clever bit is that at the OUTER end the cone/bolt passes through a spacer with a bore greater than the largest diameter of the cone so that it can be drawn fully out of the expander relieving the tension and avoiding finding yourself with an assembly irretrievably stuck inside the pipe.
Slight mod would be some form of key on the cone engaging in a slot in its bore which would ensure the cone does not rotate in the bore thus finding yourself with an irretrievably...
Petronella
Well-Known Member
KISS Holding Tank
That's what I've done too. I was lucky that I just had enough height above waterline for it to be gravity fed.
Tek-Tanks (not the cheapest but what an excellent company for customer service) made me a made-to-measure 90l tank with fittings where I wanted them.
Then it was simply a question of cutting the old waste outlet pipe (see Fig. 1) just above its outlet seacock, building a strudy shelf and slotting in the tank (see Fig 2). Add a breather pipe (the long almost horizontal coiled hose) and you're done. There's a pump out fitting to the left of the picture in case I need it in the future and a large red inspection/clearance hatch in case that's needed.
No pump, no Y-diverters and no extra hosework. To use the holding tank simply close the original waste outlet seacock and the tank will fill. To empty just open the seacock again.
This article was useful to me during planning and installation of the tank. KISS Holding Tanks (Keep It Simple Stupid)
Love it!
That's what I've done too. I was lucky that I just had enough height above waterline for it to be gravity fed.
Tek-Tanks (not the cheapest but what an excellent company for customer service) made me a made-to-measure 90l tank with fittings where I wanted them.
Then it was simply a question of cutting the old waste outlet pipe (see Fig. 1) just above its outlet seacock, building a strudy shelf and slotting in the tank (see Fig 2). Add a breather pipe (the long almost horizontal coiled hose) and you're done. There's a pump out fitting to the left of the picture in case I need it in the future and a large red inspection/clearance hatch in case that's needed.
No pump, no Y-diverters and no extra hosework. To use the holding tank simply close the original waste outlet seacock and the tank will fill. To empty just open the seacock again.
This article was useful to me during planning and installation of the tank. KISS Holding Tanks (Keep It Simple Stupid)
Love it!
Graham_Wright
Well-Known Member
It's called a Rawlbolt (sort of).
mikemonty
Well-Known Member
Only vaguely.
The point is that a gradual expansion from the bottom of the bore will allow for easier expansion than a rawlbolt which will expand along its full length at one time because the rawlbolt would be trying to deform all the pipe at once.
What I decribed is a bit closer to a swaging tool for expanding heat exchanger tubes.