Tanker Familiarization Tanker Safety and PPE 3 — Questions and Answers
Question 1: What is the safe working pressure limit concept known as MAWP in tanker operations?
- Maximum Allowable Working Pressure — the upper pressure limit for cargo tanks and piping (Correct answer)
- Minimum Approved Warming Protocol for heated cargo
- Mandatory Alarm Warning Point for gas detectors
- Mean Average Wave Pressure for structural loading
Correct answer: Maximum Allowable Working Pressure — the upper pressure limit for cargo tanks and piping
MAWP is the maximum pressure at which a pressure vessel or piping system is designed to operate safely.
Question 2: Which condition makes a tanker cargo tank safe for hot work after cargo discharge?
- Gas-free certificate issued by a competent person after testing below LEL (Correct answer)
- 48 hours of natural ventilation with all hatches open
- Completion of inert gas purging to below 8% oxygen
- Flushing the tank with seawater three times
Correct answer: Gas-free certificate issued by a competent person after testing below LEL
A gas-free certificate confirms the atmosphere is below the lower explosive limit and safe for ignition sources like welding.
Question 3: Eye protection rated for chemical splash protection must comply with which ANSI standard?
- ANSI Z87.1 (Correct answer)
- ANSI Z89.1
- ANSI Z41.1
- ANSI Z359.1
Correct answer: ANSI Z87.1
ANSI Z87.1 covers performance requirements for eye and face protection devices, including splash-rated chemical goggles.
Question 4: During an ammonia refrigerated cargo operation, what specific PPE addition is required beyond standard chemical suit and SCBA?
- Insulated cryogenic gloves rated to −60°C (Correct answer)
- Full chemical splash goggles worn over SCBA mask
- Ammonia-resistant full-face shield over SCBA
- Carbon-activated charcoal over-boots
Correct answer: Insulated cryogenic gloves rated to −60°C
Refrigerated ammonia (anhydrous) is cryogenic; insulated cryogenic gloves protect against cold burns in addition to chemical exposure.
Question 5: A portable gas detector alarm activates at 20% LEL on the main deck. What action is required?
- Record the reading and continue monitoring until 25% LEL
- Stop all ignition sources and investigate the leak immediately (Correct answer)
- Increase ventilation fans and resume operations
- Evacuate to muster station and abandon cargo operations
Correct answer: Stop all ignition sources and investigate the leak immediately
An alarm at 20% LEL requires eliminating all ignition sources and identifying the gas source before any work continues.
Question 6: What is the purpose of the permit-to-work (PTW) system on tankers regarding PPE?
- It replaces the need for PPE in low-risk tasks
- It formally identifies the specific PPE required before hazardous work begins (Correct answer)
- It allows management to waive PPE requirements in emergencies
- It is only applicable during drydock periods
Correct answer: It formally identifies the specific PPE required before hazardous work begins
The PTW system ensures that required PPE is identified, available, and worn before any hazardous task is authorized.
Question 7: Why must chemical-resistant boots be worn during cargo connection and disconnection operations?
- To protect against tripping on hose couplings
- To guard against foot injury from cargo spills and drips (Correct answer)
- To provide electrical insulation from shore power
- To prevent slipping on wet decks in heavy seas
Correct answer: To guard against foot injury from cargo spills and drips
Cargo connection points are high-spill-risk areas where chemical-resistant boots protect against burns or injury from liquid cargo contact.
Tanker Familiarization Tanker Safety and PPE 3
What is the safe working pressure limit concept known as MAWP in tanker operations?