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| Section | Objectives |
|---|---|
| Risk-Based Process Safety (RBPS) Framework | - Training and Performance Assurance - Process Knowledge Management - Safe Work Practices - Auditing - Process Safety Culture - Conduct of Operations - Operational Readiness - Metrics and Performance Measurement - Hazard Identification and Risk Analysis - Management of Change - Compliance with Standards - Asset Integrity and Reliability - Contractor Management - Incident Investigation - Management Review and Continuous Improvement - Emergency Management - Operating Procedures |
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質問 # 17
The accumulation for a relief device is:
正解：D
解説：
The correct answer is C because accumulation is defined (per CCPS and industry standards such as ASME) as the pressure increase above the relief device set pressure, expressed as a percentage of the set pressure .
When a relief device (such as a safety valve or rupture disc) activates, the system pressure is allowed to rise above the set pressure during discharge. This temporary pressure increase is called accumulation . It reflects the system's ability to safely handle overpressure while the relief device is relieving excess energy or material.
Mathematically, accumulation is calculated as:
Option A is incorrect because accumulation is not referenced to MAWP. Option B describes pressure relative to MAWP, which is not the definition of accumulation. Option D is also incorrect because it mixes MAWP and set pressure improperly.
CCPS emphasizes understanding accumulation as part of pressure relief system design , ensuring that vessels can tolerate the maximum allowable accumulation (often 10% for single relief devices under many codes) without exceeding safe limits.
質問 # 18
A 3000 gallon, stainless steel, insulated vessel rated for 30 psig is equipped with a rupture disc set for 30 psig for emergency relief. Assuming each of the following scenarios has been deemed possible, which would require the smallest sized relief?
正解：A
解説：
The correct answer is A because a pool fire scenario typically results in a slower and more predictable heat input compared to other overpressure scenarios, thus requiring a smaller relief capacity .
In CCPS guidance for relief system design and hazard analysis , different scenarios are evaluated based on how rapidly they generate vapor or pressure. A pool fire heats the vessel externally, causing liquid boiling and vapor generation at a rate governed by heat transfer. Although serious, this is generally a gradual energy input
, allowing for comparatively smaller relief sizing.
Option B (internal ignition) involves rapid combustion of vapor within the vessel, producing a very fast pressure rise , often too fast for conventional relief systems to handle effectively. This would require significantly larger or different protective measures.
Option C (runaway reaction) is the most severe scenario. A reaction with a temperature rise rate of 500°C/min indicates extremely rapid energy release, leading to very high vapor generation rates and pressure rise , requiring the largest relief capacity .
CCPS emphasizes that relief devices must be sized for the worst credible scenario , but when comparing scenarios, external fire cases typically produce the lowest required relief rates , while reactive and explosive scenarios demand much larger capacities.
質問 # 19
A process safety audit team felt that their access to operating personnel was being limited. Which of the following statements would be valid with respect to this situation? (Select all that apply)
正解：C、D
解説：
The correct answers are B and D because CCPS emphasizes that effective audits require open communication and engagement with operating personnel , who play a key role in implementing process safety systems.
Option B is correct because operating personnel have first-hand knowledge of how procedures, safeguards, and systems actually function in practice . They can reveal gaps between documented processes and real- world execution, making their input essential for identifying weaknesses and improvement opportunities.
Option D is also correct because allowing audit teams access to operating personnel reflects a strong process safety culture , characterized by transparency, openness, and willingness to learn. Organizations with mature safety cultures encourage interaction and do not restrict information flow.
Option A is incorrect because facilitating access does not inherently create conflict; rather, it promotes understanding. Option C is incorrect because operators often possess practical expertise that complements management knowledge. Option E is incorrect because while coordination is needed, broad access is generally beneficial, not detrimental.
CCPS highlights that audits should be collaborative and fact-based , and engaging operating personnel is critical to obtaining an accurate assessment of process safety performance.
質問 # 20
A Management of Change work process includes: (select all that apply)
正解：B、C、D
解説：
The correct answers are B, C, and D because these are core required components of a Management of Change (MOC) system as defined by CCPS.
Option B is correct because MOC requires a systematic evaluation of the impact of any change on process safety . This includes identifying new hazards, assessing risks, and determining whether existing safeguards remain adequate. This step is essential to prevent unintended consequences, such as introducing new failure modes or hazardous conditions.
Option C is also correct because CCPS requires that MOC be governed by a formal written procedure . This ensures consistency, accountability, and traceability in how changes are proposed, reviewed, approved, and implemented across the organization.
Option D is correct because approval requirements are a key part of MOC. Changes must be reviewed and authorized by qualified personnel (e.g., engineering, safety, operations) before implementation to ensure all risks are properly addressed.
Option A is not a primary element of MOC. While safe work practices may be affected by a change and could be reviewed as part of the process, they are not a fundamental requirement of the MOC workflow itself .
Overall, CCPS emphasizes that effective MOC systems must include hazard review, documentation, and formal authorization to maintain process safety integrity.
質問 # 21
Which of the following can be considered applicable inspection methods as part of an Inspection/Testing
/Preventive Maintenance program under the Asset Integrity and Reliability Element? (Select all that apply)
正解：A、C、D
解説：
The correct answers are A (Ultrasonic Thickness Measurements), C (Ultrasonic Leak Detection), and D (Positive Material Identification) because these are recognized inspection and testing techniques within CCPS' s Asset Integrity and Reliability element of RBPS. This element ensures that critical equipment is designed, fabricated, installed, and maintained to perform reliably throughout its lifecycle.
Ultrasonic Thickness Measurement (UT) is a widely used non-destructive examination (NDE) method to monitor wall loss due to corrosion or erosion. It provides quantitative data that supports fitness-for-service evaluations and remaining life assessments.
Ultrasonic Leak Detection is another diagnostic tool used to identify leaks in pressurized systems, valves, and fittings. It supports early detection of loss of containment, which is critical for preventing process safety incidents.
Positive Material Identification (PMI) verifies that the correct alloy materials are installed, helping prevent failures due to incorrect material selection-especially important in environments prone to corrosion, high temperature, or hydrogen damage.
Work Orders (B) , while essential for maintenance management, are administrative controls rather than inspection or testing methods. CCPS distinguishes between execution systems (like work orders) and actual inspection techniques used to assess equipment condition.
These inspection methods collectively support proactive identification of degradation mechanisms and ensure equipment integrity is maintained.
質問 # 22
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