There are very good reasons why workers are required to be a “safe distance” from equipment that is being “pressure tested”. These safe distance requirements apply to BOTH pneumatic and hydrostatic pressure testing. Had these distances been honored/respected, a component failure during the pressure test may cause damage, but not an injury!
On August 26, 2019, a 58-year-old contractor was pressure testing a heat exchanger when the flange failed and exploded.