Question 339Safety & Environmental - Assistant Engineer

The correct answer is C) weighing the cylinder and recharging if weight loss exceeds 10% of the weight of the charge. The reasoning behind this is that annual servicing of a hand portable CO2 fire extinguisher requires weighing the cylinder to ensure the total weight is within 10% of the original full charge weight. If the weight loss exceeds 10%, the extinguisher must be recharged. This is a standard maintenance requirement specified in fire extinguisher regulations and industry best practices. The other options are incorrect because: A) inspecting the pressure gauge is part of the monthly inspection, not the annual servicing; B) hydrostatic testing is required every 5-12 years, not annually; and D) discharging, cleaning, and recharging is not necessary on an annual basis unless the extinguisher has been used or the weight is outside the 10% tolerance.