Massachusetts Plumbers Journeyman Exam 2024

Massachusetts Plumbers Journeyman Exam 2024 Existing Work -Answer-A plumbing system or any part thereof installed prior to March 11, 2005. Soil Pipe -Answer-Any pipe that conveys the discharge of toilets, urinals or fixtures having similar functions to the building drain or building sewer. The discharge may be conveyed with or without the discharge from other fixtures Water Distribution Pipe -Answer-A pipe within the building or on the premises that conveys water from the water service pipe to the point of usage Barometric Loop. -Answer-A vertical loop of pipe, rising to a height sufficient to prevent back- siphonage from occurring in the potable water supply pipe. (Approximately 35 feet, depending on the weight of the atmosphere.) Developed Length -Answer-The length of a pipeline as measured along the center line of the pipe or fittings. Roughing-in. -Answer-The installation of all parts of the plumbing system that can be completed prior to the installation of fixtures. This includes drainage piping, water supply piping, vent piping, the necessary fixture supports, and any fixtures that are built into the building. Trap Seal -Answer-The vertical distance between the crown weir and the top of the dip of the trap. Air Gap (Drainage System). -Answer-The unobstructed vertical distance through the free atmosphere between the outlet of a waste pipe and the flood level rim of the receptacle into which the waste discharges. Air Fixture Unit. -Answer-A unit of liquid flow used in sizing both supply and drainage pipes. It is equal to 1 cubic foot per minute or approximately 7.5 gallons per minute. Liquid Waste -Answer-Discharge from any fixture, appliance, area or appurtenance that does not contain human or animal waste matter suspended in a solution. Vacuum -Answer-Any pressure less than that exerted by the atmosphere Branch Interval -Answer-A distance along a soil or waste stack corresponding in general to a story height, but not less than eight feet in vertical height, and wherein the horizontal branches from one floor or story of a building are connected to the stack Testing water supply shall be at a pressure no less than? -Answer-125 PSI Storm or Sanitary drains shall be installed at a slope that: -Answer-a slope that produces a computed velocity of discharge of not less than two feet per second. Horizontal drainage piping which is (3) three inches in diameter or smaller shall be installed with a minimum uniform pitch -Answer-¼ inch per foot Horizontal drainage piping which is larger than three inches in diameter shall be installed with a minimum uniform pitch of -Answer-1/8 inch per foot Special Labs. All licensed plumbers and plumbing apprentices installing pipe connections or working on drains to hospital waste and vent systems, mortuary waste and vent systems, laboratory waste and vent systems, dental waste and vent systems and plumbing systems in radioactive sensitive areas -Answer-shall have the surface of their body and clothing protected by disposable or washable gowns similar or equal to the gowns, gloves and face masks worn by surgical staff. Whenever there is reason to believe that the plumbing system of any building has become defective, it shall be subjected -Answer-test and/or inspection, and any defects found shall be corrected as required in writing by the Inspector Waste and Vent shall be tested for? -Answer-until there is a uniform gauge pressure of five P.S.I.G. or sufficient pressure to balance a column of mercury ten inches in height. This pressure shall be held without introduction of additional air for a period of at least 15 minutes. The gauge used for this test shall be calibrated in increments no greater than 1/10 of a pound. c Upon completion of a section or of the entire water supply system when roughed, it shall be tested and proved tight under a pressure not less than -Answer-125 pounds per square inch Upon notice of a request for an Inspection of the rough plumbing, the Inspector shall make the Inspection within -Answer-two working days after receipt of such notice Two acceptable tests for Drain and Waste -Answer-Peppermint Test and Air Test Quarter bends, or their equivalent may be used in soil and waste lines when the change in the direction of the flow is from the -Answer-horizontal to the vertical. Short sweep fittings may be used in a branch waste line when the waste line serves only - Answer-one outlet and cleanouts are provided. List 3 Prohibited Fittings -Answer--No fitting that incorporates a straight T branch shall be used as a drainage fitting. - No running threads, bands or saddles shall be used in a drainage system. -A fitting commonly referred to as a "Sisson Joint" is prohibited A dead end may be used to? -Answer-Extend the cleanout. Where trenches are excavated below grade such that the bottom of the trench does not form the bed for the pipe, the trench shall be? -Answer-back-filled to grade with sand tamped in place so as to provide a uniform bearing surface for