CPT Safety Systems & Standards 2 — Questions and Answers
Question 1: Which layer of protection in a Safety Instrumented System (SIS) is responsible for automatically taking the process to a safe state?
- Basic Process Control System (BPCS)
- Safety Instrumented Function (SIF) (Correct answer)
- Process alarm system
- Operator response procedure
Correct answer: Safety Instrumented Function (SIF)
A Safety Instrumented Function (SIF) is the specific function within a SIS designed to automatically bring a process to a safe state upon detecting a hazardous condition.
Question 2: What does the term 'proof test interval' refer to in the context of safety instrumented systems?
- The time between scheduled process shutdowns
- The frequency at which a safety function is tested to verify it can perform its intended function (Correct answer)
- The time delay before an alarm activates
- The interval between operator safety briefings
Correct answer: The frequency at which a safety function is tested to verify it can perform its intended function
Proof test interval is the scheduled frequency at which a safety instrumented function is manually tested to confirm it remains capable of performing its protective action.
Question 3: In a HAZOP study, what does the guideword 'MORE' typically indicate?
- A complete absence of process flow
- A quantitative increase above normal design intent (Correct answer)
- Reverse flow direction
- An unintended additional component in the process stream
Correct answer: A quantitative increase above normal design intent
The HAZOP guideword 'MORE' indicates a quantitative increase in a parameter such as flow rate, temperature, or pressure beyond the design intent.
Question 4: What is the primary purpose of a safety shower and eyewash station in a chemical process facility?
- To decontaminate equipment before maintenance
- To provide immediate first aid by flushing hazardous chemicals from the body or eyes (Correct answer)
- To test the purity of process water
- To cool personnel during high-temperature operations
Correct answer: To provide immediate first aid by flushing hazardous chemicals from the body or eyes
Safety showers and eyewash stations provide immediate first aid decontamination by flushing hazardous substances from skin or eyes to minimize injury severity.
Question 5: According to OSHA Process Safety Management (PSM), what information must be included in a Process Safety Information (PSI) package?
- Employee work schedules and vacation records
- Hazards of the chemicals, technology of the process, and equipment used in the process (Correct answer)
- Cost estimates for process upgrades
- Customer delivery specifications
Correct answer: Hazards of the chemicals, technology of the process, and equipment used in the process
OSHA PSM requires PSI to include chemical hazard information, process technology details, and equipment specifications to support safe process management.
Question 6: What is the function of a rupture disk in a pressure relief system?
- To regulate normal operating pressure continuously
- To provide a one-time burst device that relieves pressure at a predetermined level (Correct answer)
- To measure the differential pressure across equipment
- To seal process lines during maintenance shutdowns
Correct answer: To provide a one-time burst device that relieves pressure at a predetermined level
A rupture disk is a non-reclosing pressure relief device that bursts at a set pressure to rapidly vent pressure and protect equipment from overpressure damage.
Question 7: When performing a Management of Change (MOC) review for a process modification, which of the following must be evaluated?
- Only cost and schedule impacts
- Impact on process safety, operating procedures, training needs, and regulatory compliance (Correct answer)
- Vendor delivery timelines exclusively
- Aesthetic changes to the control room layout
Correct answer: Impact on process safety, operating procedures, training needs, and regulatory compliance
MOC reviews must evaluate safety impacts, procedural changes, training requirements, and regulatory compliance to ensure modifications do not introduce new hazards.
CPT Safety Systems & Standards 2
Which layer of protection in a Safety Instrumented System (SIS) is responsible for automatically taking the process to a safe state?