Heating

Question 1

Hight restriction for indirect fired blowthrough heater?

Answer 1

12’ max 6’ min

Question 2

Min height for draw through

Answer 2

12’ and up

Question 3

The u value is?

Answer 3

The amount of heat loss in btus through 1 square foot of a combination of materials in 1 hour.

Question 4

All boiler make up must be protected from cross connections by the means of?

Answer 4

Approved backflow preventer

Or reduced pressure principle backflow device with atmospheric port.

Question 5

Diaphram tanks are to take up the compression of the water in the system.

Answer 5

False .Water cant be compressed

Question 6

Min clearance on combustable single walled vent pipe is?

Answer 6

6”

Question 7

If two flanges have similar liners the flanges

Answer 7

May be joined without the use of a gasket

Question 8

Whay colour is ptfe

Answer 8

White

Question 9

What joining method is unique to frp?

Answer 9

Butt and wrap

Question 10

What are the two basic types of cast iron

Answer 10

Grey and white

Question 11

What is the maximum allowable pressure drop through a compressed air system

Answer 11

5psi

Question 12

If flange material is brittle it is recommended to use what flange should be used?

Answer 12

Full face flange.

Question 13

What type of corrosion is occuring when one substance reacts with another to create a new compound

Answer 13

Chemical

Question 14

Rule of thumb when sizing a diaphram (bladder) tank

Answer 14

÷7000btu

Question 15

Rule of thumb for sizing a conventional expansion tank?

Answer 15

÷5000