Sanitary drainage (Discharged drainage) Flashcards
what are the terms in soil and waste system?
- drainage above ground
- discharged stack
- soil pipe
- waste pipe
- Macerate
what is discharged stack?
vertical pipe conveying foul fluid/ solid
macerate
- to soften and separate into parts by steeping in liquid
- to soften or decompose (food) by the action of solvent .
- to cause to grow thin
tough copolymers used especially for making moulded particle
ABS,acrylonitrile-butadiene-styrene
DR- drainage installations should be remove?
effluent quickly and quietly
DR-free from?
blockage
how does blockage occur?
- system is overloaded with solids
- become frozen
- suffer restricted flow at poorly constructed bend/joints
- or has building material left inside pipe
each section of pipe must be what?for?
must be accessible for inspection and internal cleaning
DR- be durable?
last as long as it can unless new technology or requirements are needed
DR- economic
save money
single stack system was developed by?
Building research establishment during 1960s
why single stack system is developed?
to simplify the extensive pipe work that was associated with above ground drainage
what is the concept of singles stack system
to group appliances around the stack with seperate branch pipe serving each.
length of waste trap must be?
75mm
length of waste trap for bath and shower
50mm
if offsets is unavoidable, there should be?
no connection within 750mm of the offtsets
the branch bath waste must be? purpose? and require?
200mm below the centre of WC branch, to avoid crossflow, and require 50mm nom. dia. parallel pipe to offset the bath waste pipe or an S trap to offset the connection.
when the vent pipe is at the highest stack, it may reduced to?
75mm nom. dia.
modification of single stack system, what are they?
- waste pipe may be fitted with anti-siphon or resealing
- branch waste pipe can be ventilated
- larger than standard dia. waste pipe may be fitted
where does ventilated stack system is used?
in building where close grouping of appliances occur
modified single stack system, requirement for WC
- 8 maximum
- 100mm branch pipe nom. dia.
- 15m max. length
- gradient 90 1/2 and 95 degree (9 to 90mm/m)
modified single stack system, requirement Basin
- 4 max
- 50mm pipe nom. dia.
- 4m max. length
- gradient 91-92 1/2 degree (18 and 45 mm/m)
modified single stack system, requirement Urinals(bowls)
- 5 max
- 50mm pipe nom. dia
- branch pipe as short as possible
- gradient 18-90mm/m
modified single stack system, requirement Urinals( stalls)
- 7 max
- 65mm pipe nom. dia.
- branch pipe as short as possible
