1. C
2. B
3. C
4. A
5. A

1. B
2. C
3. A
4. B
5. D
6. D

1. B
2. B
3. B
4. C
5. D
6. B
7. A
8. A
9. B

1. D
2. B
3. B
4. B
5. B
6. D
7. B
8. C
9. A
10. B
11. B
12. B
13. B
14. A
15. C

# Competency E3

1. A
2. B
3. B
4. A
5. D
6. D
7. B
8.  C, D, A, B
9. B
10. A
11. A
12. A
13. A

## Self-Test 2

1. Type of Gas Natural Gas Steel 1.75 kPa A.2 (b) Metric 250 Pa 12 m 12 m
Pipe Letter Pipe Load Pipe Size
A 35 kW $\frac{3}{4}$ in
B 10 kW $\frac{1}{2}$ in
C 45 kW $\frac{3}{4}$ in
2. Type of Gas Propane Gas Copper Tube 11 in B.6 (a) Imperial 1 in 35 ft 40 ft
Pipe Letter Pipe Load Pipe Size
A 100 MBH $\frac{5}{8}$ in
B 40 MBH $\frac{1}{2}$ in
C 140 MBH $\frac{3}{4}$ in
3. Type of Gas Natural Gas – Low Pressure Systems Natural Gas – High Pressure Systems
Piping Material Copper Tube Copper Tube
System Pressure 7 in 2 psig
Table Used A.9 (a) Imperial A.10 (a) Imperial
Table Allowable Pressure Drop 1 in 1 psig
Longest Measured Run (LMR) A = 10 ft

B = 20 ft

C = 40 ft

40 ft
Code Zone (CZ) A = 10 ft

B = 20 ft

C = 40 ft

40 ft
Pipe Letter Pipe Load Pipe Size
A 100 MBH $\frac{5}{8}$ in OD copper tube
B 40 MBH $\frac{1}{2}$ in OD copper tube
C 40 MBH $\frac{5}{8}$ in OD copper tube
D 180 MBH $\frac{1}{2}$ in OD copper tube

## Self-Test 3

1. Type of Gas Natural Gas Welded carbon with forged fittings 5 psig A.5 (a) Imperial 2.5 psig 160 ft 200 ft 187.17 ft
Pipe Letter Pipe Load Pipe Size
A 1,500 MBH 1 in
B 3,000 MBH $1 \frac{1}{4}$ in
C 4,500 MBH $1\frac{1}{2}$ in

Proof of C-A
$\begin{array}{ll}\text{4 - 1½″ welded 90° @ 1.61 feet}&=6.44 \text{ feet} \\ \text{2 - 1½″ welded tee @ 6.04 feet}& = 12.08 \text{ feet} \\ \text{2 - 1″ welded 90° @ 2.06 feet}&=2.10 \text{ feet} \\ \text{1 - 1″ valve @ 2.62 feet}& = 2.62\text{ feet} \\ \text{1 - 1″ welded tee @ 3.93 feet}& = \underline{3.93 \text{ feet}} \\ \text{Equivalent Fitting Length} & = 27.17\text{ feet} \\ \text{Measured Length C-A} & = \underline{160.00 \text{ feet}} \\ \text{Longest Equivalent Length of Run (ELR)} &= 187.17\text{ feet} \end{array}$

The longest ELR is 187.17 feet, so the 200 ft code zone was correct.

2. Type of Gas Natural Gas Welded carbon with forged fittings 34 kPa A.5 (b) Metric 17 kPa 30 m 45 m 41.03 m
Pipe Letter Pipe Load Pipe Size
A 293 kW $\frac{3}{4}$ in
B 805 kW $1\frac{1}{4}$ in
C 3,000 kW 2 in
D 1,170 kW $1\frac{1}{4}$ in
E 4,170 kW 2 in
F 4,975 kW $2\frac{1}{2}$ in
G 5,268 kW $2\frac{1}{2}$ in

Proof of G – B
$\begin{array}{ll}\text{2 - 2½″ welded 90° @ 0.75m}&=1.50 \text{ m} \\ \text{2 - 1½″ welded tees @ 2.82 m}& = 5.64\text{ m} \\ \text{3 - 1¼″ welded 90° @ 0.42 m}&=1.26 \text{ m} \\ \text{1 - 1¼″ valve @ 1.05 m}& = 1.05\text{ m} \\ \text{1 - 1¼″ welded tee @ 1.58 m}& = \underline{1.58 \text{ m}} \\ \text{Equivalent Fitting Length} & = 11.03\text{ m} \\ \text{Measured Length C-A} & = \underline{30.00 \text{ m}} \\ \text{Equivalent Length of Run (ELR)} &= 41.03\text{ m} \end{array}$

Additional proofs

Proof of G-C
$\begin{array}{ll}\text{2 - 2½″ welded 90° @ 0.75m}&=1.50 \text{ m} \\ \text{1 - 2½″ welded tees @ 2.82 m}& = 2.82\text{ m} \\ \text{3 - 2″ welded 90° @ 0.63 m}&=1.89\text{ m} \\ \text{1 - 2″ valve @ 1.58 m}& = 1.58\text{ m} \\ \text{2 - 2″ welded tees @ 2.36 m}& = \underline{4.72 \text{ m}} \\ \text{Equivalent Fitting Length} & = 12.51\text{ m} \\ \text{Measured Length C-A} & = \underline{22.00 \text{ m}} \\ \text{Equivalent Length of Run (ELR)} &= 34.51\text{ m} \end{array}$

Proof of G-D
$\begin{array}{ll}\text{2 - 2½″ welded 90° @ 0.75m}&=1.50 \text{ m} \\ \text{1 - 2½″ welded tees @ 2.82 m}& = 2.82\text{ m} \\ \text{3 - 1¼″ welded 90° @ 0.42 m}&=1.26\text{ m} \\ \text{1 - 1¼″ valve @ 1.05 m}& = 1.05\text{ m} \\ \text{1 - 1¼″ welded tee @ 1.58 m}& = \underline{1.58\text{ m}} \\ \text{Equivalent Fitting Length} & = 8.21\text{ m} \\ \text{Measured Length C-A} & = \underline{25.00 \text{ m}} \\ \text{Equivalent Length of Run (ELR)} &= 33.21\text{ m} \end{array}$

The longest ELR is 41.03 metres, so the 45 meter code zone was correct.

3. 7″ WC Piping System:
Type of Gas Natural Gas Screwed carbon steel pipe 7″ WC A.2 (a) Imperial 1″ WC 93 ft 100 ft
Pipe Letter Pipe Load Pipe Size
A 100 MBH $\frac{3}{4}$ in
B 75 MBH $\frac{3}{4}$ in
C 175 MBH 1 in

2 PSG Piping System:

Type of Gas Natural Gas Screwed carbon steel pipe 2 psig 1 psig A.3 (a) Imperial 83 ft 90 ft
Pipe Letter Pipe Load Pipe Size
1 300 MBH $\frac{1}{2}$ in
2 150 MBH $\frac{1}{2}$ in
3 450 MBH $\frac{3}{4}$ in

5 PSG Piping System

Type of Gas Natural Gas Screwed carbon steel pipe 5 psig A.5 (a) Imperial 2.5 psig 84 ft 125 ft
Pipe Letter Pipe Load Pipe Size
A 5,000 MBH $1\frac{1}{4}$ in
B 450 MBH $\frac{1}{2}$ in
C 5,450 MBH $1\frac{1}{4}$ in
D 175 MBH $\frac{1}{2}$ in
E 5,625 MBH $1\frac{1}{4}$ in

Proof of G – B
$\begin{array}{ll}\text{5 - 1¼″ screwed 90° @ 3.45 ft}&=17.25 \text{ ft} \\ \text{1 - 1¼″ valve @ 3.45 ft}& = 3.45 \text{ ft} \\ \text{2 - 1¼″ screwed tees @ 6.90 ft}&=\underline{13.80 \text{ ft}} \\ \text{Equivalent Fitting Length} & = 34.50\text{ feet} \\ \text{Measured Length C-A} & = \underline{84.00 \text{ feet}} \\ \text{Equivalent Length of Run (ELR)} &= 118.50\text{ feet} \end{array}$

The longest ELR is 118.50 feet, so the 125 ft code zone was correct.

# Competency E5

1. A
2. D
3. A
4. C
5. B
6. B
7. B
8. C
9. D
10. B

## Self-Test 2

1. A
2. B
3. A
4. B
5. C
6. A
7. Match the names of the burner parts to their
lettered locations
• Venturi D
• Mixing Tube C
• Burner Ports A
• Orifice E
• Burner Head B
• Primary air openings F
8. B
9. A
10. C
11. C
12. A
13. A
14. B
15. B

1. C
2. B
3. D
4. D
5. B
6. D
7. B
8. B
9. C
10. D
11. B
12. A
13. C
14. B
15. A

# Competency E6

1. D
2. C
3. D
4. B

1. B
2. B
3. C
4. B
5. A
6. A
7. A
8. C

1. C
2. C
3. B
4. B
5. C
6. D
7. B
8. B

## License

Block E: Fuel Gas Systems Copyright © 2023 by Industry Training Authority BC is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.