Gaskets are the problem The ...

Gaskets are the problem

The arrangement of a deep well submersible is common. With such a high lift, special treatment of gaskets is necessary. Firstly, use fiber gaskets, not rubber. Rubber under those pressures will always blow out.

Secondly, fiber gaskets only go from the pipe bore to the inside of the bolt hole in width, and are commonly called "ring" gaskets. To ensure that these gaskets remain in place under extreme pressure, recess one of the mating flanges such that the recess is 1mm or 1/32" larger in diameter than the ring gasket, and half the gasket thickness in depth. This "captures" the ring gasket and it is impossible to blow it out.

Problem solved!