IRFISHER: SEWERAGE LINE WORK

Small scale sewerage line works are include:

vent pipe-act as to convey odour from the every toilet room in the bulding.Last time a brittle pipe was used by nowday UPVC pipe was used.The important thing is the vent pipe must be project out from top of the roofing area.

connection pipe between sanitary fitting and manhole

All the sanitary pipe from all the wc,sinki and floor trap will connect to manhole by UPVc pipe at varies size normally from 100 mm to 150 mm.The piping system including bend 90 and 45 degree,straight pipe to manhole.

manhole construction

Manhole have 2 type,one construct from brickwall and the second one is from rc wall.Normally for depth less than 1.2 m ,brickwall is suitable and more than 1.2m,rc wall will construct.For manhole on the passage of vehicle,rc manhole more suitable with heavyduty cover.Inside plastering must from high alumina cement and thickness of brickwall is 225mm.Inside half vcp pipe with concrete haunch screed at 1:2 to the pipe.For maintenance like reparing or cleaning works,when open the cover,make all the gases is vacum out before entering.Some cases the workers died because of pollution or toxids from the gases.

VCP pipe laying

VCP from size varies size is connecting between manhole.The control of gradient is the most important aspect .Laying of VCP is begin from excavation,concrete bedding,lay pipe until bankfill the trench.The important detail of manhole is IL level and depth of manhole.The existing ground beam level also important to know.The skecmatic drawing is the important working drawing.Last time an earthen ware or clay pipe were used as sewer line pipe.Only GBH have the only one supplier at the southern region.

septic tank contruction

Brickwall septic tank was most popular sewerage treatment plant since 100 years ago,Now theSATS system is the most popular sewerage treatment plant were using in Malaysia.There are various company produced this system.The PE will calculate and the type of SATS system will depend on the value of PE.

The concrete system for STP is design if the value of PE are more than 2000.The author have an experience design STP for cover 5000 PE in Kelantan.Sometimes after all the SATS tanks are instslled snd start to backfill the earth,all the tank must filled with the water at least half to avoid floating although every tank have a tie tendon to the concrete base.

connection to main sewer/public sewer

The connection to the main sewer is the last process to connect the last manhole to the nearest existing manhole,If the nearest manhole is shallow than the last manhole,the new manhole at existing system will construct.The tapping to the manhole will done by the specialist and having a licence from IWK/SPAN.

testing and commisioning

The testing and commisioning will carried out with using a ping pong from manhole to manhole and using a ultra light to make sure the gradient is correct and no obstruction to the piping system.