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63.Wet vent – that portion of a vent pipe through where waste water also flowsthrough.64.Looped vent - a vertical vent connection on a horizontal soil or waste pipe branchat a point downstream of the last fixture connection and turning to a horizontalline above the highest overflow level of the highest fixture connected there at theterminus connected to the stack vent65.Local vent – a pipe or shaft to convey foul air from a plumbing fixture or a room tothe outer air.66.The main vent is that potion of the vent pipe system, serving as terminal forsmaller forms of individual and grouped fixture trap ventilation. The drainage system is a combination of 67.Waste pipe, 68.Vent pipe, and 69.Water supply. In a plumbing system it is the portion of the drainage pipe installation designed tomaintain a balance atmospheric pressure inside the system to prevent problemssuch as: 70.Trap seal loss71.Retardation of flow72.Deterioration of Materials
Trap seal loss can be attributed to the following factors:73.Siphonage 74.Back pressure75.Evaporation76.Capillary ActionTypes of Ventilation77.Natural vent78.Mechanical vent79.Cross-Ventilation - The circulation of fresh air through open windows, doors, orother openings on opposite sides of a room.Types of objectionable Traps80.Full S Traps81.¾ S Trap82.mechanically sealed trap83.Light metal partition traps84.Ventilation of a plumbing system, is that portion of the drainage pipe Installation,designed to maintain a balance atmospheric pressure85.Trap seal loss can be attributed to inadequate ventilation of the trap and thesubsequent minus and plus pressures inside the system. 86. -100 Show a detailed section of a P-Trap showing the diff. parts and trap sealheight.Detailed section of a P-Trap