I never understand why people ONLY check the "dead weight". The B31 Codes require checking the WEIGHT (the sum of the dead weight and the live weight).

There are two sources of pressure thrust. IF you have bellows convolutions those convolutions are of a larger diameter than the ID of the pipe. The annular area (the area between the pipe ID and the ID of the bellows (beyond the pipe OD) times the internal pressure will place a force directly on the nozzle (the load path is from the bellows, through the connecting pipe to the nozzle. The "bore thrust" is the pipe ID times the pressure and that force will not impinge on the nozzle but will impinge upon the first surface it hits inside the pump. When desiging the pump bolts and foundations these two forces must be added to get the total force.

If you have a straight hose with an ID the same as the pipe no pressure force will be seen by the nozzle but the pressure force that is the ID times the the pressure will impinge upon the first surface it hits inside the pump. But you will have to support the pipe WEIGHT on the side away from the pump as that end will be virtually cantilevered from the adjacent support.

Regards, John.