ASP Domain 4: Fire Prevention and Protection

Question 1

A maintenance crew has opened and locked out the disconnect for a motor circuit and the nominal voltage is 480 volts. Before the crew begins work, the qualified person operates the start controls and confirms the motor will not restart. She then tests the motor terminals with a voltage tester and finds no voltage. A technician points out that the control circuit shares a conduit with another circuit that is still energized, and that other equipment feeds the same motor leads. What must the qualified person's test also do before the circuit can be treated as deenergized?

1. ABe witnessed by the employee who applied the lock, since only that employee can verify the circuit is deenergized
2. BDetermine whether any energized condition exists from inadvertently induced voltage or unrelated voltage backfeed, even though the circuit parts were deenergized and presumed safe
3. CBe replaced by a visual inspection of the lock and tag, because a lockout device is sufficient proof of a deenergized condition
4. DBe repeated at the start of each following work shift, because the test remains valid for only one shift

Question 2

A site is adding a remote pumping system for gasoline (a Category 1 flammable liquid) to feed three dispensing units. During a pre-startup review, the safety professional checks the control arrangement. The electrician reports that the pump is wired to a single key switch in the station office. Once the attendant turns the key, the pump runs continuously and supplies all dispensers until the key is turned off at the end of the shift. Impact valves with fusible links are installed at the base of each dispenser. What is the required corrective action?

1. ANo correction is needed, because impact valves with fusible links at each dispenser provide the required protection against uncontrolled flow.
2. BReplace the key switch with a control that lets the pump run only when a nozzle is removed from its bracket and the dispenser switch is manually actuated, and that stops the pump when all nozzles are returned.
3. CKeep the key switch but add a timer that shuts the pump off after 30 minutes of continuous operation.
4. DRelocate the pump inside the station building so the attendant can control it directly from the office.

Question 3

A welder needs to weld a bracket onto a steel wall panel in a plant area not designed for hot work. The panel is bare, uncovered sheet steel. On the other side of the wall, a stack of cardboard cartons sits against the panel. The supervisor cannot relocate the cartons before the job must start. Which action does the standard require for this job to proceed?

1. AProvide a fire watch on the opposite side of the wall from the work
2. BShut down the ducts and conveyor systems in the area
3. CDo not weld, because welding is prohibited on any metal wall that has combustibles behind it
4. DInstall fire-resistant shields only on the welder's side of the wall