California C-36 Plumbing Contractor Exam

Pipe serving flushometer valves is assigned flushometer fixture units based on the number and category of valves served (Table 610.10), while branches and mains serving flushometer tanks are sized consistent with flush tank water closet procedures.

A sectional water test requires at least a 10 foot head held not less than 15 minutes (including the upper 10 feet of the preceding section), while the air test requires a uniform gauge pressure of 5 psi (or a 10 inch mercury column) held 15 minutes without adding air — and plastic pipe shall not be tested with air.

An air test of the hot and cold water supply system must be a minimum of 50 psi, whereas a water test must be at least equal to the system working pressure.

With AHJ approval, building drain piping 4 inches and larger may slope not less than 1/8 inch per foot, while building sewers 4 through 6 inches may slope not less than 1/8 inch per foot and 8 inches and larger not less than 1/16 inch per foot.

Continuous drainage flow from a pump, sump ejector or air conditioning equipment is converted at 2 drainage fixture units per gpm, while a continuous-flow water supply connection has its required gpm determined and added separately to the system gpm demand.

Velocity shall not exceed 8 ft/s in cold water and 5 ft/s in hot water in copper and copper alloy tube and fitting systems.

CPC 608.2 normally requires an expansion tank downstream of the regulator, but a system designed by a licensed plumbing contractor or registered design professional may use approved pressure relief valves with a maximum pressure relief setting of 100 psi or less (the general maximum relief setting under 608.4 is 150 psi).

For a Category I appliance (excluding engineered systems), the maximum horizontal connector length is 100 percent of the chimney/vent height for Type B double-wall and 75 percent of the vent height for single-wall.

Brazing filler metals melt between 1,100°F and 1,500°F (and for gas tubing joints the brazing material must melt above 1000°F with not more than 0.05 percent phosphorus), while soldering requires only about 350°F to 550°F.

For occupancies other than single dwelling units the pump must pass a 2 inch solid ball and the discharge piping shall be not less than 3 inches with a backwater valve and gate valve; the 2 inch discharge minimum applies only to single dwelling units.

The velocity method may be used only for house-sized buildings three stories or fewer, with no designed continuously running outlets and at least 40 psi available pressure; below 40 psi another method such as the friction/pressure-loss method must be used.

A commercial grid strainer connects with a 1 1/2-inch threaded tailpiece, whereas a residential pop-up uses a 1 1/4-inch threaded tailpiece.

Stopping leaks and clearing stoppages (including removing and reinstalling water closets) are exempt, but where a trap, drainpipe, soil, waste or vent pipe is defective and must be removed and replaced with new material, it is new work requiring a permit and inspection.

Option (1) of §1541.1(b)(1)(A) allows sloping no steeper than 1 1/2 horizontal to 1 vertical (34 degrees, the Type C slope) with no soil classification, appendices or engineer; steeper slopes require one of the other design options.