USCG Exam PracticeHydraulics and pneumatics
A pneumatic system aboard a vessel has a maximum allowable working pressure of 200 psi. Under 46 CFR §58.30-5, what design feature is specifically required for this system that would NOT be mandatory if the working pressure were 140 psi?
- A. A pressure relief valve on each compressor stage.
- B. An aftercooler downstream of the final compression stage.
- ✓ A surge tank or other acceptable means of pulsation dampening.Correct
- D. A moisture separator and drain trap at each low point in the system.
Why C is correct
46 CFR §58.30-5(c) requires that pneumatic systems with a maximum allowable working pressure in excess of 150 psi be designed with a surge tank or other acceptable means of pulsation dampening. At 140 psi the system is below that threshold and the requirement does not apply.
Cited:46 CFR §58.30-5