How many pounds of sodium nitrite are added to the boiler prior to placing the boiler on a dry lay-up?

The correct amount of sodium nitrite to be added to the boiler prior to placing it on a dry lay-up is 10 pounds per 1,000 gallons. Sodium nitrite serves as an effective corrosion inhibitor, helping to protect the metal surfaces of the boiler from corrosion while in a dry environment.

The application of 10 pounds per 1,000 gallons is based on guidelines established to ensure the boiler content is adequately treated against the potential for oxidation and corrosion, which can occur even in dry conditions due to residual moisture or environmental exposure. Ensuring the proper quantity is crucial; too little may not provide sufficient protection, while too much may lead to undesirable chemical reactions or residue buildup.

In practice, proper dosing according to the size and conditions of the boiler helps to maintain the integrity of the system over time. Familiarizing oneself with these standards is essential for effective maintenance procedures within the naval operations context, keeping machinery in optimal condition for future use.