PTW
What must happen when the PH changes out during a shift?
The new PH must review and sign the permit, and the AO must be notified. (pg 73)
True or False.
Emergency Shutdown (ESD) valves may be used for DBB isolations.
True!
Emergency shutdown (ESD) valves may be used for a DBB isolation, provided they can be reliably immobilized; for example, disconnecting the driver or power source. (pg 134)
When critical devices are temporarily defeated, what three things must be protected through proper precautions?
1. People.
2. Equipment.
3. Environment
(pg 122)
Under which LSRA is this found; "See and be seen, maintain a safe distance"?
Working around Mobile Equipment
What is the maximum duration a work permit can be valid for with an approved extension?
Up to a maximum of 16 hours with an approved extension. (pg 73)
What are the two basic methods of Purging with inert gases?
1. Purging by Dilution - Inert gas is used to pressurize the system, then vented to a safe location. This is repeated until the gas is reduced to zero or below 80% LEL in an inert atmosphere.
2. Purging by Displacement - Nitrogen or another inert gas flows through the system. High and low point vents and drains are opened to ensure effective purging, especially in dead legs.
(pg 177)
What is the approved duration for a temporary defeat authorized by the Asset Manager?
7 to 30 days
Periodic atmospheric testing is typically required after what duration of absence from the work site, such as during shift changes or meal breaks?
Greater than 30 minutes
(pg 217)
If there is a confined space located inside another confined space, how should permits be managed?
Each confined space must be treated separately. A separate Confined Space Entry (CSE) Permit is required for the inner space, even if it is located within another permitted confined space. (pg 99)
Under condition 'B', if isolation standard cannot be met and SVI is planned. Who must be on site to witness zero energy before first break?
The operations AO must be at the site to witness the demonstration of zero energy. (pg 132)
Who approves a temporary defeat that affects a large section of plant (train) or the whole platform?
Asset Manager
If a protective device is isolated on out-of-service equipment and not captured on a Temporary Defeat (TD) Certificate, where should it be documented?
It should be documented on the Isolation Control Certificate and reinstated as part of the re-commissioning process.
(pg 127)
What is used instead of a permit for non-permitted work activities?
Even if a task doesn’t require a formal permit, safety controls must still be applied to manage any risks. These include:
(pg 75)
What are the 4 approved standard isolation methods?
(pg 131)
What are some critical systems in our facility, list 5?
1. Fire-fighting systems.
2. Fire and gas detection system or annunciator panels.
3. Emergency shutdown (ESD) systems (such as sensors, valves, and controllers)
4. Critical programmable logic controller (PLC) or DCS shutdowns per FIMS.
5. Evacuation system.
Can someone with a permit do permitted work assuming all controls are in place? explain answer!
No. Only WMS-trained individuals can perform permitted work. The PIC may exempt a specialist for short duration work if a WMS trained PH is present.
(pg 71)
What types of work activities does the Permit to Work System (PTWS) address? (7)
1. Hot Work
2. CSE
3. Critical Work
4. Energy Isolation
5. Temporary Defeats of Critical Devices.
6. Atmospheric Testing.
7. Simultaneous Operations.
(pg 68)
What are 4 approved methods used to free equipment of hydrocarbons?
what are some critical Devices in our facility, List 5?
1. A fire, gas, heat, or smoke detector.
2. Vibration monitors.
3. Pressure safety valves (PSVs) and rupture disks where no redundancy exists.
4. Critical process safety devices such as:
- Level shutdown high-high (LSHH)
- Level shutdown low-low (LSLL)
5. Car Seal Valves (e.g. PSVs, BDVs, Thermal)
(pg 123)
What is the correct order for performing atmospheric tests during confined space entry or similar operations?