Hazard Alert
Worker's Compensation Board
POSTER # Hazard Alert 93-01

CONSTRUCTION
CONCRETE DELIVERY TRUCK — WATER TANK EXPLOSION

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The pressurized water tank behind the cab of a concrete delivery truck exploded, injuring the operator and causing major damage to the cab. The incident occurred while the truck was pouring footings for a residential building. The tank was fitted with a pressure-release valve and a pressure gauge. The explosion occurred when the pressure-release mechanism failed.


SAFE WORK PRACTICE
Tanks containing gases or liquids under pressure must be equipped with suitable pressure-relief mechanisms. These mechanisms must be properly maintained and inspected on a regular basis. Noted defects must be corrected immediately and valves must be replaced at appropriate intervals, using manufacturers' guidelines. Employers must keep a log book and record all maintenance done to pressure-relief mechanisms. The operator must know what the correct pressure-relief settings are and how to read the valve.

This poster is part of an archival collection of WCB health and safety posters, dating from 1969 until the present time. At the time this poster was originally produced, it reflected the current WCB requirements. In all cases, today's WCB regulation and requirements must be applied to the situation shown in each poster.