Steamfitter Risk Assessment and Mitigation 3 — Questions and Answers
Question 1: A steamfitter is asked to weld on a pipe that previously carried an unknown chemical. What is the FIRST risk mitigation step before welding?
- Begin welding quickly to minimize exposure time
- Purge and verify the pipe is clean using a hot-work permit process (Correct answer)
- Apply a fire blanket around the area and start welding
- Weld only if no odor is detected from the pipe
Correct answer: Purge and verify the pipe is clean using a hot-work permit process
Hot-work permits require verification that the pipe has been purged, cleaned, and tested before any ignition source is introduced.
Question 2: Which type of risk assessment is conducted BEFORE a project begins to identify potential hazards proactively?
- Reactive risk assessment
- Preliminary hazard analysis (PHA) (Correct answer)
- Incident investigation review
- Post-incident risk audit
Correct answer: Preliminary hazard analysis (PHA)
A Preliminary Hazard Analysis is a proactive, pre-project technique for identifying and ranking hazards before work starts.
Question 3: When using a pressure relief valve (PRV) as an engineering control on a steam system, what risk does it primarily mitigate?
- Thermal insulation degradation
- Overpressure conditions that could cause pipe rupture (Correct answer)
- Corrosion from condensate buildup
- Vibration-induced fatigue failure
Correct answer: Overpressure conditions that could cause pipe rupture
A PRV automatically vents excess pressure to prevent the system from exceeding its maximum allowable working pressure (MAWP).
Question 4: A steamfitter is working in a trench to install underground steam lines. Soil conditions are sandy and the trench is 6 feet deep. What is the MINIMUM required protective system?
- No protection needed for depths under 8 feet
- Sloping, shoring, or trench box adequate for Type C soil conditions (Correct answer)
- Verbal spotter monitoring is sufficient
- Install only temporary fencing around the trench perimeter
Correct answer: Sloping, shoring, or trench box adequate for Type C soil conditions
OSHA 1926 Subpart P requires a protective system for any trench 5 feet or deeper; sandy soil is Type C, requiring the most conservative slope or shoring.
Question 5: Which document formally authorizes a worker to perform hot work (welding, cutting) in a facility?
- Material Safety Data Sheet (MSDS)
- Hot Work Permit (Correct answer)
- Personal Protective Equipment checklist
- Confined Space Entry Log
Correct answer: Hot Work Permit
A Hot Work Permit documents safety checks, fire watch assignments, and approval before welding or cutting begins.
Question 6: Fall protection is required by OSHA in general industry when a worker is exposed to a fall of what minimum height?
- 4 feet (Correct answer)
- 6 feet
- 10 feet
- 8 feet
Correct answer: 4 feet
OSHA 29 CFR 1910.28 requires fall protection for walking/working surfaces at 4 feet or greater in general industry settings.
Question 7: A risk register is BEST described as:
- A personal injury log maintained by the site medic
- A documented inventory of identified risks, their ratings, and assigned mitigation actions (Correct answer)
- A government-issued permit required before starting a project
- A list of all OSHA citations issued to a contractor
Correct answer: A documented inventory of identified risks, their ratings, and assigned mitigation actions
A risk register is a living project document that tracks hazards, probability/severity ratings, controls, and responsible parties.
Steamfitter Risk Assessment and Mitigation 3
A steamfitter is asked to weld on a pipe that previously carried an unknown chemical.
What is the FIRST risk mitigation step before welding?