🔍 Key Concepts

• P-tank purpose on offshore supply vessels (handling drilling mud, brine, or similar liquids) • What factor most directly affects the operation of a pressure tank system • Difference between air pressure supply, heating, and circulating water pressure in fluid-transfer systems

💭 Think About

• Ask yourself: What is the basic function of a P-tank on an oil industry supply vessel, and how is the cargo actually moved from the tank to where it needs to go? • Which of the listed items is absolutely essential for the P-tank to perform its primary job, and which might be optional or not normally associated with that tank? • Consider what kind of cargo is commonly carried in these tanks and whether it typically requires heating or external water circulation to be transferred.

✅ Before You Answer

• Verify which system component provides the driving force that pushes the cargo out of the P-tank. • Decide whether temperature control is normally critical for the type of cargo usually carried in P-tanks on OSVs. • Consider if circulating salt water pressure is a standard requirement for P-tank operation, or if it belongs to a different type of system.