When Propane is to be used in the construction repair or import of a building, how many 100lb cylinders may be manifolded together and used indoors?

The correct answer indicates that a maximum of three 100 lb propane cylinders may be manifolded together and used indoors. This is based on safety regulations and guidelines established to ensure proper handling and mitigating hazards associated with propane use within enclosed spaces.

Manifold systems allow multiple cylinders to be used as a single source for supplying gas, which is especially useful in construction and repair scenarios. However, limitations are put in place to minimize risks such as pressure build-up or accidental release of gas. Using more than three cylinders indoors increases the potential for gas leaks and could overwhelm ventilation systems designed to safely manage propane.

Regulations often dictate specific configurations for using propane cylinders indoors, focusing on safety standards such as appropriate distance from ignition sources, ventilation requirements, and cylinder stability to prevent tipping. Understanding these regulations is crucial for safe practices in gas operations, particularly in construction and repairs where propane is commonly used.