What is meant by the term 'hard suction'?

The term 'hard suction' refers specifically to a rigid hose that is utilized to draft water from a static source, such as a pond, lake, or swimming pool. This type of hose is designed to withstand the negative pressure created during the drafting process while preventing collapse. The rigid construction allows for efficient transfer of water from a low-pressure source to the fire apparatus, ensuring that the water can be effectively drawn into the pump.

In contrast, flexible hoses, vacuum hoses, or expandable hoses serve different purposes. Flexible hoses are generally used for discharging water rather than drafting. Vacuum hoses may be involved in removing air, but they are not typically designated for water drafting. Expandable hoses are designed for ease of deployment and storage but do not have the same structural integrity necessary for drafting operations. Thus, the characteristics and function of hard suction hoses make them essential for efficiently accessing water sources during firefighting efforts.