Tanker Systems and Equipment Flashcards
7 cards from real Tanker Familiarization practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Tanker Systems and Equipment flashcards as text
What is the primary purpose of a tanker's inert gas system (IGS)?
Answer: To maintain a non-flammable atmosphere in cargo tanks
The IGS replaces oxygen in cargo tanks with inert gas (typically flue gas or nitrogen) to keep the atmosphere below the flammable range, preventing explosions.
Which valve type is most commonly used as a master isolation valve on a tanker's cargo manifold?
Answer: Gate valve
Gate valves are preferred at cargo manifolds because they provide full-bore flow with minimal pressure drop when fully open.
On a product tanker, what does a 'deep-well pump' refer to?
Answer: A submersible pump mounted inside the cargo tank
A deep-well pump is a submersible electric pump installed inside the cargo tank, eliminating the need for a separate pump room.
What is the function of a pressure/vacuum (P/V) valve on a cargo tank?
Answer: To protect the tank from overpressure or excessive vacuum
P/V valves automatically open to vent excess pressure or admit air/gas when a vacuum develops, protecting tank structural integrity.
What material is typically used for cargo hoses when transferring petroleum products to prevent static buildup?
Answer: Electrically bonded hoses with a conductive wire
Electrically bonded cargo hoses contain an embedded conductive wire to dissipate static electricity and prevent spark discharge during transfer.
Which instrument is used to measure the oxygen content inside a cargo tank before entry?
Answer: Electrochemical oxygen analyzer
An electrochemical oxygen analyzer measures the percentage of O₂ in a space; at least 20.8% O₂ is required for safe entry into an enclosed space.
What is a 'Butterworth opening' on a tanker?
Answer: A fixed access port used to insert tank cleaning machines
A Butterworth opening is a deck fitting through which portable or fixed tank cleaning machines (water-washing heads) are inserted during crude oil washing or water washing.