Class 5 Boiler Practice Exam

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Are all cast iron boilers required to have a wash out opening that is at least a specific size?

Yes, at least 2 nps
No, no size requirement exists
Yes, at least 1 1/2 nps
No, they can vary in size

The correct answer is: Yes, at least 1 1/2 nps

Cast iron boilers are required to have a wash out opening to facilitate maintenance and ensure proper cleaning of the boiler. The specific requirement of having a wash out opening that is at least 1 1/2 nominal pipe size (nps) reflects industry standards aimed at preventing the buildup of sediment and scale within the boiler. Ensuring that the wash out opening meets this minimum size requirement allows for effective cleaning and inspection, which are essential for maintaining the operational efficiency and safety of the boiler. This size requirement is established in various codes and guidelines governing boiler construction and maintenance, indicating the necessity of having adequately sized openings to allow for proper access during maintenance procedures. Having a wash out opening of at least this size ensures that any deposits can be effectively removed, minimizing the risk of operational issues or potential failures.