6 pcs of 38" triple-offset butterfly valves are passing (more than 50% of number installed). The valves worked fine for about 12 months. Increasing the torque from 75% to 100% didn't help.

Further to the comment about the rotameter: there are "Purge rotameters" with constant flow controllers that modulate to hod a pretty constant flowrate even if the purge pressure varies.

I work in a large oil refinery. Our piping specifications are quite specific that piping flanges should be connected using studs, not bolts.

The first observation is that the supercharger being a positive displacement air pump virtually meters the air volume going into the engine.

It is not unusual for multiple chillers piped in primary secondary configuration to be unable to fully load. The reason is that the primary loop flow rate and secondary loop flow rate are very seldom

The advantages of tumbling at the valve for an intake charge.There are two distinct types of motion within the cylinder, tumble and axial swirl and it's possible to have a combination of both.

A classic case is when the pump is filling the lines from empty. The pump will start and ramp to minimum frequency. The line fill function takes over and 'manages' the pump from there.

The valve component pressure design requirements would be in standards like ASME B16.34 ,API 600, API 6D, etc.