Ductile Iron Pipe - Key Terms (Vocabulary Flashcards)

Vocabulary-style flashcards covering key terms and concepts from the video notes on ductile iron pipe installation, testing, backfill, and casing.

Estimated cutting time for 18-inch ductile iron pipe

Approximately 18 minutes; based on a guideline of 1 minute per inch of pipe.

Maximum trench width for an 8-inch concrete pipe

24 inches.

Who may operate valves and hydrants serving a new main

Waterworks employees only.

Backfill compaction in Type 4 laying condition

Approximately 80 percent of standard Proctor.

Flat bottom trench

Undisturbed earth.

Pitometer taps placement on ductile iron pipe

At the 12 o'clock position (top of the pipe).

Weight of a 20 ft length of 12-inch push-on ductile iron pipe at 350 psi

725 pounds.

Torque range for a 5/8-inch bolt in a mechanical joint

45 to 65 foot-pounds.

Action if mud or trench water has stood in a section of new pipe

Scrub the inside with a strong chlorine solution and flush pipe out.

Hydrostatic testing Method A

Method A.

Hydrostatic testing allowance for 1500 feet of 12-inch ductile iron pipe at 350 psi

17,106 pounds.

Hydrostatic testing leakage allowance

2.28 gallons per hour.

Maximum stacking height for ductile iron pipe

12 feet.

Minimum cover for water mains to cushion traffic shocks

2.5 to 3 feet.

Maximum size stone to improve trench bottom

3 inches.

Minimum excavation clearance when excavating rock for pipe size 24 inches or less

6 inches.

Pile location for excavated trench materials

Street side of the main.

Minimum width of wooden walkways with side guard fences when trenching destroys sidewalks

4 feet.

Minimum casing size under railroads/highways where casing is required (larger than bells' outside diameter)

6 to 8 inches.

Pavement cut width wider than trench to permit firm foundation when street is replaced

6 inches.

Casing size larger than pipe when required

6 to 8 inches larger than the pipe.

Gasket material for connecting two mechanical-joint flanged ductile iron pipe pieces

Rubber.

Painted lines around steel pipe for push-on joints represent

Seating of the pipe properly into the bell socket.

Definition of 'rock' in trench backfill

Rock refers to large gravel formations where loose cobbles are more than 8 inches in diameter.

Maximum offset for a 20 ft length of pipe with 5% deflection (MJ pipe)

22 inches.

Best saw for out-of-trench cuts on any size pipe

Abrasive cut-off saw.

Purpose of thrust blocks or kick blocks

To resist resultant forces.

Process of seating plain end into a bell socket

Inserting plain end into the socket.

Maximum direct-tap size for a 4-inch pipe with 0.49 wall thickness

1-1/4 inches.

Maximum direct-tap size for a 12-inch pipe with 0.73 wall thickness

2 inches.

Outside diameter of flange welded on a UB S-12 plate

19 inches.

Required opening in a concrete vault for a valve with a 12-inch inside diameter pipe

18 inches.

Suitable backfill for ductile iron pipe

Good quality materials.

Maximum deflection angle for ductile iron pipe

5 degrees.

Waterproof barrier coating for insulation of ductile iron pipe consists of what?

Asphalt.

Definition of undisturbed earth (alternate entry)

Flat bottom trench