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Process Safety and Work Permits
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Process Safety and Work Permits
Process Safety and Work Permits
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1
Question
How do safe work practices reduce risk during a task?
Page 2
Answer
They outline methods for performing tasks with minimum risk to people, equipment, materials, the environment, and processes.
2
Question
Which items constitute the minimum PPE before entering the process area?
Page 2
Answer
Hard hat with chinstrap, safety glasses, safety shoes, long sleeves and Maong pants, and a facemask.
3
Question
How do the three road speed limits differ by area?
Page 2
Answer
Main Road: 30 kph. Process Road: 20 kph. Projects: 15 kph.
4
Question
How do caution tape and danger tape differ in use?
Page 5
Answer
Yellow-and-black caution tape marks identified hazards that may not be immediately obvious. Red danger tape marks an immediate or high-potential safety concern; crossing it is prohibited.
5
Question
Why does combustion continue only while key conditions remain available?
Page 5
Answer
Fuel must reach its ignition temperature, and the reaction continues while enough heat, fuel, and oxygen remain available.
6
Question
How does quenching differ from smothering when combating fire?
Page 5
Answer
Quenching removes heat. Smothering removes oxygen.
7
Question
Which fire class involves energized electrical equipment?
Page 5
Answer
Class C.
8
Question
How should an operator use a fire extinguisher according to TPASS?
Page 6
Answer
Twist the pin, pull the pin, aim the nozzle at the base of the fire, and squeeze the lever or trigger.
9
Question
Which extinguisher types are described as suitable for Class A, B, and C fires?
Page 6
Answer
Multipurpose dry chemical and clean agent extinguishers. The source also describes cartridge-operated multipurpose dry chemical as effective on Classes A, B, and C.
10
Question
Why must water extinguishers be limited to Class A fires?
Page 6
Answer
The guidance specifies water extinguishers for Class A fires only. On Class B fires, they could spread flammable liquid; on Class C fires, they could create a shock hazard.
11
Question
How does the fire-water system maintain pressure before firefighting demand?
Page 7
Answer
Two electric motor-driven jockey pumps maintain pressure in the fire-water system loop. Their cut-in pressure is 9 barg.
12
Question
What happens during automatic FM-200 activation after smoke is detected in two zones?
Page 8
Answer
First-zone detection signals the control panel and activates the alarm bell, but does not release the agent. Second-zone detection activates the pre-discharge horn; ventilation shuts down, a 60-second countdown begins, and then the cylinders release FM-200.
13
Question
How does a deluge system supply water when activated?
Page 9
Answer
Its pipe system remains empty until the deluge valve operates, then pressurized water is distributed through open nozzles or sprinklers.
14
Question
Why can a BLEVE occur in a heated pressurized liquid vessel?
Page 9
Answer
If heating raises pressure beyond what the sealed vessel can contain, the vessel mechanically fails and a BLEVE occurs. Mechanical damage or overfilling can also cause one.
15
Question
Which three core values are defined for the organization?
Page 1
Answer
Entrepreneurship, stewardship, and integrity.
16
Question
How are the main risk-control measures ranked from most to least effective?
Page 10
Answer
Elimination, substitution, engineering controls, administrative controls, and personal protective equipment (PPE).
17
Question
How does a fall-protection device reduce the harm from a fall?
Page 10
Answer
It stops a fall and decreases the impact of forces on the body. A full-body harness distributes forces, and a shock-absorbing lanyard decreases total fall-arresting forces.
18
Question
Which scaffold height requires structural design, a full-body harness, and complete handrails?
Page 10
Answer
At 6 m and above, structural design is required. At 6 ft and above, a full-body harness is required. At 4 ft and above, complete handrails are required.
19
Question
How does water pressure release foam concentrate from the bladder system?
Page 10
Answer
Incoming water from the main water line presses on the rubber bladder and squeezes out the foam concentrate. The concentrate flows through the distribution line to the tank’s foam chamber, where air ingress helps form foam.
20
Question
How do TWA, STEL, and ceiling exposure limits differ?
Page 11
Answer
TWA measures average exposure over an 8-hour work day or a 40-hour work week. STEL is an average concentration for a short period, usually 15 minutes. A ceiling concentration should not be exceeded during any part of working exposure.
21
Question
How do PEL and REL differ in who sets them?
Page 11
Answer
OSHA sets Permissible Exposure Limits (PELs). NIOSH sets Recommended Exposure Limits (RELs).
22
Question
Which respirator is specified for conditions above IDLH?
Page 11
Answer
Only a self-contained breathing apparatus (SCBA) should be used. Below IDLH, an air-purifying respirator is adequate.
23
Question
What TWA, STEL, and IDLH values are listed for H2S?
Page 11
Answer
TWA: 10; STEL: 15; IDLH: 100.
24
Question
How does the NFPA hazard diamond communicate chemical hazards?
Page 12
Answer
It provides a quick visual representation of health, fire, and reactivity hazards, along with special hazards a chemical may pose during a fire.
25
Question
How do GHS pictograms help protect people handling chemicals?
Page 12
Answer
They visually alert people to risks from hazardous chemicals and the need to take precautionary steps. They appear on chemical product labels and accompanying safety data sheets.
26
Question
How does a Safety Data Sheet support safe chemical handling?
Page 12
Answer
It provides accurate, complete information on safely handling potentially hazardous materials and is designed to support safe, effective work. It contains 16 sections.
27
Question
How do Seiri, Seiton, and Seiso guide workplace housekeeping?
Page 12
Answer
Seiri (Sort) identifies and eliminates unnecessary items. Seiton (Systematize) puts necessary items in good order for use. Seiso (Sweep) cleans the workplace thoroughly and regularly.
28
Question
How do Seiketsu and Shitsuke sustain workplace housekeeping?
Page 13
Answer
Seiketsu (Standardized) maintains a high standard of good housekeeping to avoid sliding back. Shitsuke (Self-discipline) means employees practice the other four S’s spontaneously.
29
Question
How does a work permit reduce risk before non-operational work begins?
Page 14
Answer
It documents technical information, safety requirements, and preventive measures for authorized work. Its purpose is to identify, rectify, or eliminate potential hazards and maintain the safest possible working conditions.
30
Question
How does a Safety Task Assignment support a multi-person job?
Page 15
Answer
It provides a pre-task hazard-assessment checklist and toolbox-talk guidance so workers can discuss the task, its hazards, and the mitigations each member must undertake. It is designed for work involving two or more personnel and must be discussed before work starts.