CH.8 Installing Sewer Systems

Question 1

Municipal sewer system consists of:

Answer 1

laterals, mains that collect and transmit sewage to plant

Question 2

Pressure Pipe

Answer 2

Must be laid to even falls and grades

Question 3

Gravity Pipe

Answer 3

Must be flow down hill

Question 4

Pipe Diameter

Answer 4

when you double pipe diameter, carrying capacity increases 4 times

Question 5

slope

Answer 5

grade in pipe that causes a fluid to flow.

Question 6

Backfill

Answer 6

when a pipe is laid level or slopes the wrong way

Question 7

Pipe materials

Answer 7

cost, strength, ease of installation

Question 8

Pipe Bedding

Answer 8

can reinforce pipe by providing support; resist flattening effect and provide firm base

Question 9

pipe volume in cubic yards

Answer 9

D X D X .7854 X L (FEET) / 27

Question 10

Five most common sewer pipe materials

Answer 10

concrete, clay, DI, transite (AC), PVC

Question 11

fittings

Answer 11

used to change pipe size, pipe type or direction of flow

Question 12

wye

Answer 12

allows service pipe to enter the main, provides cleanout

Question 13

roll-over gasket

Answer 13

used in concrete sewer pipe up to 10 inches

Question 14

gaskets

Answer 14

used to join bell and spigot of same material pipe

Question 15

Equipment Needed

Answer 15

excavators, back fill equip.,hand tools, laser and optical levels, pumps.

Question 16

manholes

Answer 16

1. change directions of lines

2. intersections of lines

Question 17

sections

Answer 17

precast manholes are usually 4-6’ in diameter and 1,2 or 3’ high.

Question 18

cone

Answer 18

top section of manhole

Question 19

base

Answer 19

bottom section

Question 20

testing

Answer 20

1. visual
2. mandrel
3. water testing (infiltration and exfiltration)
4. air test