At 400 psi, the pump yawned. At 800, it began to sing—a low, resonant hum that vibrated up through Leo’s boots. By the time the needle kissed 1,150 psi, the shop had gone quiet. Even the forklift driver killed his engine.
He gave the final crank.
ANSI/HI 9.8 does not apply a "one-size-fits-all" rule. It categorizes pumps based on their usage and energy levels: ansi hi 9.8