Safety and Jobsite Practices
Control the job before you touch the system
Safety questions reward the boring sequence: identify the system and hazards, review the permit or job hazard analysis, notify the owner, monitoring company, and occupants, establish barricades and communications, and use PPE matched to the task. Treat stored energy as real: water pressure, air pressure, spring-loaded valves, electrical circuits, and elevated work. Use lockout/tagout for energy sources, confined-space procedures for pits and tanks, hot-work permits for cutting or soldering, and fall protection where required. Before depressurizing, know what the impairment affects and who must approve it. After testing, restore valves, caps, covers, and detection, then confirm normal status before leaving.
Traps
Assuming a closed valve means zero pressure; testing alarms without notifying the monitoring company; forgetting the impairment coordinator; wearing task-inappropriate PPE; leaving a system in test mode; and failing to protect the public from discharge, trip hazards, or overhead work.
Worked example / rule of thumb
Before a main drain test, notify the monitoring company and affected occupants, verify gauge readings and the drain path, wear eye, face, and hearing protection as needed, and keep radio contact with the person at the riser. Rule: if the test requires an impairment, follow the impairment program; if it can be done without one, do not create one. Restore and verify normal before departure.