Sealing PVC Pipes That Deliver Potash

Off hand, I would go with a silicone based high temperature flexible caulking, however, better try contacting the the experts here

I lack the knowledge required to give you advice on the chemical nature of potash. But I have dealt with joining pipes in a vehicle that bends, twists, and sags while it drives and pumps water at high rates.

If the runs need to bend more than a few degrees, you need a flexible hose, or a swivel joint. If you only have to deal with a few degrees of misalignment, Try grooved pipes and couplings. The trade names are Victaulic, Groove a grip that come to mind. They are widely used in building sprinkler systems.

This system will allow some movement if needed, with no leaks. If there is a need to remove and replace a section of pipe, just stop flow, unbolt the section, replace pipe and reattach the same clamp. The pvc pipe will need to have a groove cut into it, so thick wall pipe will be required. There are also locking clamps that will not allow any movement, if desired. In case there is need for exact positioning needed.

Try www.victaulic.com and remember that there are other brands out there. good luck.

you could try a teflon based sealant Loctite 567 thread sealant is a good one we currently use it is a high temperature formulation that should meet your needs.

Temperature changes will change the diameter and length of the pipe. A good thread sealant will help seal the threads, but an expansion joint will be needed if the pipe runs for any significant length. Without that, stress at the joint will eventually cause a leak no matter how you seal it.