Aspe Cpd Study Questions Ah Study Guide Graded A+

What may be installed to prevent explosions in hot water systems? {Ans: A combined (or separate) temperature and pressure relief valve. Overheating is the direct cause of explosions, protection against excessive temperature and pressure is needed. Temperature and pressure relief valves must have a relief capacity of not less than the pressure or heat input at maximum operating capacity. Every relief valve should have a discharge pipe connected to it’s outlet of at least the size of the valve discharge outlet.}Where and why are jockey pumps used? {Ans: With fire pumps, to maintain system pressure during non-operating conditions.}What pressure variations must be sustained at the 2” fixture trap for 100% safety factor? {Ans: 1” W.C.}Properties of uniform flow apply to branches of what length and longer? {Ans: 5 feet}When air flows in a pipe, a pressure loss occurs due to the friction between the air and the pipe wall. This loss of pressure is expressed by which formula? {Ans: The Darcy Formula}How high is a column of air that is equivalent to the static pressure exerted by 1 in water column? {Ans: 69.23 feet}