Cast Iron Pipes
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Types and Durability
| Description
Cast Iron Pipe |
Expected Lifespan
(Years) |
Adjustment Factors |
| Hubless cast iron* soil pipe and fittings, in accordance to ASTM A888-98 lined with protection against corrosion for below grade and above grade application. | 35 | Mains water below 7pH: -15% of no. of years
Test certificate from approved local testing authorities: +15% of no. of years |
| Hub and spigot cast iron pipe and fittings, in accordance to ASTM A-74-98 or BS 437:1978, class service (SV) or Extra Heavy (XH), lined with protection against corrosion for below grade and above grade application. | 35 | |
| Cast iron pipes with no related specification as above; e.g. not lined with protection against corrosion | < 10 | None |
In the case of 2 or more condition of adjustment factor occur, the percentage of year shall be added to obtain the durability value.
Note:
* Hubless coupling gaskets shall conform to ASTM Standard C-564*. Joints for hub and spigot pipe shall be installed with compression gaskets conforming to the requirements of ASTM Standard C-564 or shall be installed with lead and oakum.
- Design, construction,and installation in accordance to BS 8010-2.1:1987
- BS 143 : 2000 – Threaded pipe fitting in malleable cast iron
Local Standard
- SS 33 : 1975: Cast iron spigot and socket soil, waste and ventilating pipes (sand cast and spun) and fitting
- All elastomeric seals for joints in pipework, pipelines and water fittings shall comply with SS 270 : 1996.
- All water fittings shall comply with the Standards stipulated by PUB and its use in water service installations shall conform to the Public Utilities (Water Supply) Regulations and Singapore Standard :CP 48