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MEP EXAM 2 EXAM (ACTUAL / ) QUESTIONS AND
VERIFIED ANSWERS
What FPS range do commercial pipes have? - ---Answers--- 3-15
High velocity in pipes equal? - ---Answers---high noise
What is the FPS sweet spot for piping? - ---Answers---5-8 fps
What is a centrifugal pump? - ---Answers---a pump that uses an impeller to move water or other fluids
What is a horizontal split case double suction pump? - --- Answers---A type of centrifugal pump, in which the casing is split into two separate chambers. It's different from an end suction pump or inline pump, in which the casing, the suction nozzle, and the discharge nozzle are all included in a single chamber.
What is an impeller? - ---Answers---the rotating part of a centrifugal pump, compressor, or other machine designed to move a fluid by rotation.
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What is cavitation? - ---Answers---the formation of bubbles in a liquid, typically by the movement of a propeller through it.
Why is cavitation a problem? - ---Answers---Cavitation will cause the boiling point of water to drop and it will begin to eat away at the propellor / pump
What is the most common reason for oversizing pipe? - --- Answers---Future expansion
T.U. graduate developer wants to put a 400,000 ft2 shopping mall in south College Station to take advantage of the disposable income of 60,000 Aggie students. It is to be an "H" Shaped building with 4 - 50,000 ft^2 anchor stores at each end of the mall and 2 strips of 100,000 ft^2 as shell space to be built out as clients choose and as leases are signed. - --- Answers---- What is the cooling load for this mall?-400,000sq ft / 500 btu = 800 tons
- What type of cooling systems would you recommend for this
mall?-Let's say you decide to use a chiller / AHU / FC System.
Diameter of chilled water pipe calculation - ---Answers---- (800 Tons x 12000 BTUH/TON) = 9,600,000 BTU/hr
- 9,600,000 / 5000 = 1,900 GPM (Gallons Per Minute)
- 9600000 = 500 GPM Delta T
- At 5 feet per second the minimum pipe diameter = 12.5"
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