If an Ammonia receiver can hold 1,000 lbs. of liquid at 90°F, what is the maximum capacity?

The maximum capacity of an Ammonia receiver is determined by its ability to safely contain a specific volume of liquid ammonia at a given temperature and pressure. When considering the scenario presented, the correct answer reflects both the physical properties of ammonia at the specified temperature and the safety regulations surrounding the operation of ammonia storage systems.

At 90°F, ammonia has specific liquid density characteristics. Although the receiver can hold 1,000 lbs. of liquid ammonia, safety margins are applied in practice. Storage systems must adhere to guidelines that provide allowances for vapor space, thus preventing overfilling and allowing for pressure and temperature variations. This is designed to maintain a pressure-head and reduce the risk of liquid entering the vapor line.

The maximum capacity, therefore, takes into consideration not just the theoretical maximum weight of liquid ammonia but the operational safety factors that limit it to a significantly lower amount than might be expected based on simple weight calculations. The stated answer aligns with industry standards for safe operation, reflecting a realistic working capacity in compliance with safety regulations.