CSLB C-36 Plumbing ContractorPlanning and EstimatingEasy
A plumbing contractor is reviewing plans for a new commercial building that specifies the use of Cast Iron Soil Pipe. The project requires a pipe material that offers excellent sound attenuation and high resistance to abrasion. Which type of cast iron pipe would be most suitable for this application?
- AExtra Heavy (XH) cast iron
- BNo-Hub cast iron
- CService Weight (SV) cast iron
- DHub and Spigot cast iron
Show answer & explanationAnswer & explanation
Correct answer: A. Extra Heavy (XH) cast iron
Extra Heavy (XH) cast iron pipe is thicker and heavier than Service Weight (SV), providing superior sound attenuation and abrasion resistance, making it ideal for demanding commercial applications.
Why the other options are wrong
- B. No-Hub refers to the joint type, not the pipe's weight class or inherent resistance properties.
- C. Service Weight (SV) cast iron is lighter and less durable than XH, offering less sound attenuation and abrasion resistance.
- D. Hub and Spigot refers to the joint type, not the pipe's weight class or inherent resistance properties.
Cast Iron Soil Pipe Types
Cast iron soil pipe is used for drainage, waste, and vent (DWV) systems, primarily known for its durability, sound attenuation, and fire resistance.
- Service Weight (SV) is lighter, suitable for residential or less demanding commercial applications.
- Extra Heavy (XH) is thicker and more robust, used for heavy-duty commercial and industrial applications.
- Both types can be joined with No-Hub couplings or Hub and Spigot connections.
Memory trick: Heavy pipe, quiet flow, tough wear.