3. Gas distribution piping.

Question 0

2. Procedure for sizing gas pipe?

Answer 0

1. Determine Btu/cu.ft. gas from local supplier (usually 950-1100).
2. Divide applience Btu/cu.ft. to obtain applience demand.
3. Measure developed length to most remote fixture.
4. Use column from table for most remote fixture for all fixtures.
5. Select row for pipe size equaling or exceeding demand for each section.

Question 1

1. Prohibited locations for gas piping?

Answer 1

1. Stair enclosures.
2. Fire stand pipe riser.
3. Fire pump.
4. Fire rated construction.
5. Public corridor.

Question 2

3. Typical gas appliance demand in kBtu/hr?

Answer 2

1. Gas range - 65.
2. Recessed top burner - 40.
3. Recessed oven - 25.
4. Clother drier - 35.
5. Log lighter - 80.
6. WH (30-40 gal.) - 35.
7. WH (50 gal.) - 50.
8. WH (tankless 2 gpm) - 143.
9. Boiler or central furnace - 100.
10. Barbecue - 40.

Question 3

4. How shall You protect aboveground gas piping against grounding?

Answer 3

They shall be bonded to create fault return path.

Question 4

5. What gas piping considered bonded?

Answer 4

When connected to appliance with equipment grounding conductor.

Question 5

6. Min distance above ground or roof of exteriior gas pipe?

Answer 5

3-1/2” elevation.

Question 6

7. Min size of sediment trap?

Answer 6

3”.

Question 7

8. Where does not sediment trap required?

Answer 7

Ranges, clothes dryers, gas lights, outdoor grills.

Question 8

9. Where is sediment trap installed?

Answer 8

As close as practical to appliance inlet.

Question 9

10. Where must an appliance gas shut off be?

Answer 9

Within 6 feet of appliance.

Question 10

11. Length of gas connectors?

Answer 10

1. Max length 3 feet.
2. For dryer and ranges max length 6 feet.
3. Rigid piping can be longer 3 feet but less than 6 feet.

Question 11

12. What is CSST?

Answer 11

Corrugated Stainless-Steel Tubing.

Question 12

13. Tubing or piping that connects the gas supply piping to the appliance?

Answer 12

Gas connector.

Question 13

14. What is composed primarily of propane, propylene, butanes, or butylenes or mixtures thereof that is gaseous under normal atmospheric conditions but is capable of being liquefied under moderate pressure at normal temperatures. It is typically stored in tanks on site. It is heavier than air.

Answer 13

liquefied petroleum Gas, (LP).

Question 14

15. A line pressure regulator that reduces gas pressure from the range of 0.5 psig or greater to a lower level. These are often found in CSST systems with a central manifold?

Answer 14

MP regulator.