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| Section | Objectives |
|---|---|
| Risk-Based Process Safety (RBPS) Framework | - Management of Change - Process Safety Culture - Incident Investigation - Hazard Identification and Risk Analysis - Emergency Management - Operating Procedures - Auditing - Management Review and Continuous Improvement - Operational Readiness - Conduct of Operations - Process Knowledge Management - Contractor Management - Safe Work Practices - Training and Performance Assurance - Compliance with Standards - Metrics and Performance Measurement - Asset Integrity and Reliability |
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質問 # 53
Workforce involvement metrics can involve (select all that apply):
正解：A、C
解説：
The correct answers are B and C because workforce involvement metrics in CCPS RBPS focus on active participation, engagement, and feedback from personnel in process safety activities.
B (number of safety suggestions submitted) is a direct indicator of workforce engagement. A high number of suggestions reflects a proactive safety culture where employees are encouraged to identify hazards and propose improvements. CCPS highlights employee participation as a key contributor to strong process safety performance.
C (comments on training content and refresher frequency) is also a valid workforce involvement metric. It reflects how actively employees engage with training programs and provide feedback to improve their effectiveness. This aligns with CCPS emphasis on continuous learning and workforce input.
Options A (loss of containment incidents) and E (past due PHA action items) are lagging or compliance metrics , not direct measures of workforce involvement. D (nuisance alarm rate) relates to alarm management and system performance rather than employee participation.
CCPS distinguishes between participation metrics (leading indicators of engagement) and outcome metrics (incident-based or system performance). Workforce involvement metrics specifically track how well personnel are contributing to and engaging with process safety systems, which is critical for sustaining a strong safety culture.
質問 # 54
The maintenance department intends to repair a leaking pipe by applying a temporary leak repair fixture (pipe clamp). What should be considered when designing the proposed pipe clamp? (Select all that apply)
正解：C、D
解説：
The correct answers are B and C because temporary repair devices such as pipe clamps must be designed to withstand process conditions and ensure compatibility with the contained material , as emphasized in CCPS Mechanical Integrity practices.
Option B (operating pressure) is critical because the clamp must be capable of containing the internal pressure without failure . If the clamp is not designed for the system pressure, it could fail catastrophically, leading to a loss of containment. Pressure is one of the primary design parameters for any repair device.
Option C (corrosive properties) is also essential because the clamp materials must be compatible with the process fluid . If the fluid is corrosive, it could degrade the clamp or sealing materials, compromising the effectiveness of the repair over time.
Option A (viscosity) is generally not a key design factor for a clamp, as leakage containment depends more on pressure and sealing rather than fluid flow characteristics. Option D (weight) is not a primary process safety concern, although it may be a mechanical consideration.
CCPS stresses that temporary repairs must be engineered, reviewed, and managed under MOC , ensuring they are safe, reliable, and monitored until permanent repair is completed.
質問 # 55
A principal rule of HAZOP is: "The more participants in the room, the more effective the exercise will be".
True or false?
正解：A
解説：
The correct answer is B (False) because CCPS guidance on HAZOP (Hazard and Operability Study) emphasizes that effectiveness depends on having the right participants, not the maximum number of participants .
A HAZOP team should be multidisciplinary , typically including process engineers, operators, maintenance personnel, control/instrumentation specialists, and a trained facilitator. However, adding too many participants can actually reduce effectiveness by making discussions less focused, harder to manage, and more time-consuming.
CCPS highlights that an optimal team size is usually small enough to be manageable (often 5-8 members) while still providing the necessary expertise. Large groups can lead to issues such as reduced participation, difficulty in reaching consensus, and inefficient use of time.
The key principle is quality over quantity -participants should be selected based on their knowledge, experience, and ability to contribute meaningfully to hazard identification and analysis.
Therefore, the statement is false because simply increasing the number of participants does not improve the quality of the HAZOP. A well-structured, properly facilitated team with the right expertise is far more important for an effective hazard analysis.
質問 # 56 
A chemical processor has a chlorine unloading facility shown in the sketch. The area has an ambient chlorine detector with audible alarm and a chemical operator is continually in attendance during the unloading operation. In the event of a leak, the action plan is to spray water on the leak and the contained spill to effect some dilution. Identify and discuss any negative consequences that might result from implementing this plan.
正解：B
解説：
The correct answer is B because, according to CCPS hazard evaluation principles, response strategies must consider secondary hazards and unintended consequences . While water spray is sometimes used for vapor knockdown, applying it directly to a chlorine release can create additional risks.
Chlorine reacts with water to form hydrochloric acid (HCl) and hypochlorous acid (HOCl) , both of which are highly corrosive and toxic , potentially increasing harm to personnel and damaging equipment. Additionally, water can spread contamination , creating contaminated runoff that may extend the affected area and introduce environmental hazards.
From a Hazard Identification and Risk Assessment (HIRA) perspective, this response may also increase operator exposure , especially if personnel must approach the leak to apply water. The reliance on a single operator and manual intervention reduces the effectiveness of independent protection layers.
Furthermore, water spray may reduce visibility , complicate emergency response, and give a false sense of mitigation while not effectively stopping the release source. CCPS emphasizes that effective safeguards should prioritize containment, isolation, and remote mitigation , rather than relying on manual intervention in hazardous zones.
This scenario highlights the importance of thoroughly evaluating emergency actions to ensure they do not escalate the hazard or introduce new risks .
質問 # 57
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：C
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 # 58
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