According to Pollution Prevention Regulations (33 CFR Part 154), the pump being used for cargo transfer has a relief valve setting of 65 psi and a static head of 10 feet. The vessel's cargo hose used for the transfer must have a maximum allowable working pressure of at least __________.
• 33 CFR 154 requirements for cargo hose maximum allowable working pressure (MAWP) during transfer • How relief valve setting and static head together affect the maximum pressure in the hose • Conversion between feet of liquid head and psi (pounds per square inch)
• What pressure could the hose actually see in service when you combine the pump relief valve setting and the pressure from the static head of the cargo? • How do you convert 10 feet of liquid head into psi, and then add it to the relief valve setting to find the minimum MAWP? • Which answer choice is at least as high as that combined pressure, without being lower than it?
• Convert 10 feet of head into psi using the correct factor (about 0.433 psi per foot of water, adjust if thinking about a typical cargo liquid). • Add the relief valve setting (65 psi) to the pressure from static head to get the minimum pressure rating the hose must safely withstand. • Check which option is not less than that required minimum MAWP.
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