Presentation on theme: "Presentation on Trap Loss"— Presentation transcript:
1 Presentation on Trap Loss PLUMBINGPresentation on Trap Loss
2 Trap Loss At the end of this session you should be able to : Explain what is meant by trap seal loss
3 Why does Trap seal loss occur ? Trap LossWhy does Trap seal loss occur ?Trap seal loss occurs when the seal of the trap is lost as a result of poorpractice and by not following the regulations with regard to sanitationpipework installation.
4 There are three main causes of loss of trap seal: Trap LossThere are three main causes of loss of trap seal:Self siphonageInduced siphonageCompressionEach one of these is the result of poor installation work
5 Induced SiphonageCaused by appliances connecting into a common waste discharge pipe.This arrangement is not acceptable on primary ventilated stack.
6 Self Siphonage Most common in washbasins and steep sided appliances. Ensuring the waste pipe is at the correct length and fall would avoid this problem
7 CompressionUsually caused by discharging W.C. higher than the lowest waste connection.Use large radius bend at base of stack (min 200mm)Min 450mm between invert of the drain and lowest branch waste pipe.
9 Maximum pipe runsObserve these maximum pipe lengths and you shouldn’t have a problem.Loss of the trap seal can also pose a health hazard.AppliancesDia (mm)Min.trap seal depth (mm)Max. length of pipe (m)Pipe Gradient inDeg °Max Bends No.Max drop (H) mWashbasin or bidet32mm75mm1.7m2.240mm3.0m1.8 to 4.42Bath or shower50mmNo limit1.8 to 9.01.5Bowl urinal1.8 to 1.9Trough urinalKitchen sinkDishwater or washing machine1.8 to 1.4W.C.110mm1.8 min
10 Session Summary We discussed what the causes of trap loss are. Looked at each of the causes of trap loss.How to rectify the problem of trap loss.