Massachusetts Plumbers Journeyman Exam Latest Update Graded A

Massachusetts Plumbers Journeyman Exam Latest Update Graded A Existing Work A plumbing system or any part thereof installed prior to March 11, 2005. Soil Pipe 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 A pipe within the building or on the premises that conveys water from the water service pipe to the point of usage Barometric Loop. 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 The length of a pipeline as measured along the center line of the pipe or fittings. Roughing-in. 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 The vertical distance between the crown weir and the top of the dip of the trap. Air Gap (Drainage System). 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. 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 Discharge from any fixture, appliance, area or appurtenance that does not contain human or animal waste matter suspended in a solution. Vacuum Any pressure less than that exerted by the atmosphere Branch Interval 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? 125 PSI Storm or Sanitary drains shall be installed at a slope that: 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 ¼ inch per foot Horizontal drainage piping which is larger than three inches in diameter shall be installed with a minimum uniform pitch of 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 shall have the surface of their body and clothing protected