Materials
- Materials
- Cast iron
-
- 1.8m – standard length
- Lengths of pipe are joined by Yarning and Caulking (except rainwater down-pipes)
- Centrifugal cast pipes fixed using Holderbat Clips
- Plastic
- Polypropylene (withstand high temp. ; no solvent; used for traps)
- is a thermoplastic polymer
- Melting point - 130–171 °C
- Degrades from UV radiation (sun light)
- For external applications, UV-absorbing additives must be used
- Invented by the German chemist Karl Rehn in March 1954
- Polypropylene is recyclable and has the number "5" as its resin identification code
- Polyvinyl chloride (PVC or uPVC; brittle when cold)
- Acrylonitrile butadiene styrene (ABS; stronger when cold; withstand high temp. for long)
- Polyethylene (no solvent)
- Polypropylene (withstand high temp. ; no solvent; used for traps)
- Borosilicate Glass – used in laboratories; minimal thermal expansion
- Copper Tube sanitary pipework can be joined by Bronze Welding
- McGuires Rule – formula to work out the correct fall of drain pipe
- 100mm diameter pipe when laid to a gradient of 1 in 40 will give a discharge of approximately 1.14 metres per second, when flowing at 1/3 full
- The MIN Stack Vent size on 110mm PVSS to a two-storey dwelling is 75mm
< Go Back | 2013-05-27 |
Discharging
- Brunch Pipe SHOULD NOT discharge into open hoppers
- Any pipe CAN discharge into:
- Stub Stack / Discharge Stack
- Directly to a drain
- Waste water pipe CAN discharge to a gully
- Brunch pipe SHOULD terminate between the grating and top of the water seal
- Any pipe CAN discharge into:
- Direct Connection to a Drain:
- WCs Brunch Pipe on the ground floor SHOULD only be connected to a drain if the MAX depth from the floor to the drain is 1.3m
- 100mm branch connection to a discharge stack MUST have MIN bend radius of 50mm
< Go Back | 2013-05-27 |
Stack Vent
- can be reduced down to 75mm in houses of 2 stores or less
- MIN 900mm termination above the opening if <3m from it
< Go Back | 2013-05-14 |
Intumescent Fire Collar
- (~£10) – prevents spread of fire
- MIN 450mm from the invert to the lowest brunch connection
- MIN 200mm invert bend Ø
- No brunches within 750mm of the offset
- Strap-on boss connection to soil stack makes by hole saw
< Go Back | 2013-05-14 |
Branch Connections
- MIN 500mm between bath/shower and basin connection which is fitted with Resealing Trap
Appliance |
MIN pipe size |
MAX length |
MIN Gradient |
MAX con. |
---|---|---|---|---|
WC>80mm |
100 (7.2L/sec.) |
6.0 |
18-90 |
8 |
WC<80mm |
75 (3.4L/sec.) |
6.0 |
18-90 |
1 |
Washbasin or Bidet |
32 |
1.7 |
18-90 |
3 |
Sinks & Baths; washing machine; kitchen sink; sink macerator |
40 |
3.0 |
18-90 |
|
Sinks & Baths |
50 (1.2L/sec.) |
4.0 |
18-90 |
|
Urinal |
50 |
3.0 |
18-90 |
|
WC (outlet > 100mm) and >1 WC is connected |
- |
- |
9 |
|
< Go Back | 2013-05-14 |
Main Stack
- MIN 75mm (82mm actual pipe size) to connect WC<80mm (only 1 WC) and for a drainage pipe
- MIN 100mm (110mm actual pipe size) to connect WC>80mm or those discharging soil waste
< Go Back | 2013-05-10 |