Competency E1

Self-Test 1

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

Self-Test 2

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

Self-Test 3

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

Competency E2

Self-Test 1

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

Self-Test 1

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
   Piping Material	Steel
   System Pressure	1.75 kPa
   Table Used	A.2 (b) Metric
   Table Allowable Pressure Drop	250 Pa
   Longest Measured Run (LMR)	12 m
   Code Zone (CZ)	12 m

   Pipe Letter	Pipe Load	Pipe Size
   A	35 kW	[latex]\frac{3}{4}[/latex] in
   B	10 kW	[latex]\frac{1}{2}[/latex] in
   C	45 kW	[latex]\frac{3}{4}[/latex] in

2. Type of Gas	Propane Gas
   Piping Material	Copper Tube
   System Pressure	11 in
   Table Used	B.6 (a) Imperial
   Table Allowable Pressure Drop	1 in
   Longest Measured Run (LMR)	35 ft
   Code Zone (CZ)	40 ft

   Pipe Letter	Pipe Load	Pipe Size
   A	100 MBH	[latex]\frac{5}{8}[/latex] in
   B	40 MBH	[latex]\frac{1}{2}[/latex] in
   C	140 MBH	[latex]\frac{3}{4}[/latex] 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	[latex]\frac{5}{8}[/latex] in OD copper tube
   B	40 MBH	[latex]\frac{1}{2}[/latex] in OD copper tube
   C	40 MBH	[latex]\frac{5}{8}[/latex] in OD copper tube
   D	180 MBH	[latex]\frac{1}{2}[/latex] in OD copper tube

Self-Test 3

1. Type of Gas	Natural Gas
   Piping Material	Welded carbon with forged fittings
   System Pressure	5 psig
   Table Used	A.5 (a) Imperial
   Table Allowable Pressure Drop	2.5 psig
   Longest Measured Run (LMR)	160 ft
   Code Zone (CZ)	200 ft
   Proofed longest (ELR)	187.17 ft

   Pipe Letter	Pipe Load	Pipe Size
   A	1,500 MBH	1 in
   B	3,000 MBH	[latex]1 \frac{1}{4}[/latex] in
   C	4,500 MBH	[latex]1\frac{1}{2}[/latex] in

   Proof of C-A
   [latex]\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}[/latex]

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

2. Type of Gas	Natural Gas
   Piping Material	Welded carbon with forged fittings
   System Pressure	34 kPa
   Table Used	A.5 (b) Metric
   Table Allowable Pressure Drop	17 kPa
   Longest Measured Run (LMR)	30 m
   Code Zone (CZ)	45 m
   Proofed Longest (ELR)	41.03 m

   Pipe Letter	Pipe Load	Pipe Size
   A	293 kW	[latex]\frac{3}{4}[/latex] in
   B	805 kW	[latex]1\frac{1}{4}[/latex] in
   C	3,000 kW	2 in
   D	1,170 kW	[latex]1\frac{1}{4}[/latex] in
   E	4,170 kW	2 in
   F	4,975 kW	[latex]2\frac{1}{2}[/latex] in
   G	5,268 kW	[latex]2\frac{1}{2}[/latex] in

   Proof of G – B
   [latex]\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}[/latex]

   Additional proofs

   Proof of G-C
   [latex]\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}[/latex]

   Proof of G-D
   [latex]\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}[/latex]

   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
   Piping Material	Screwed carbon steel pipe
   System Pressure – 7″ WS	7″ WC
   Table Used	A.2 (a) Imperial
   Table Allowable Pressure Drop	1″ WC
   Longest Measured Run (LMR)	93 ft
   Code Zone (CZ)	100 ft

   Pipe Letter	Pipe Load	Pipe Size
   A	100 MBH	[latex]\frac{3}{4}[/latex] in
   B	75 MBH	[latex]\frac{3}{4}[/latex] in
   C	175 MBH	1 in

   2 PSG Piping System:

   Type of Gas	Natural Gas
   Piping Material	Screwed carbon steel pipe
   System Pressure – 2 PSI	2 psig
   Selected Pressure Drop – 1 PSI	1 psig
   Table Used	A.3 (a) Imperial
   Longest Measured Run (LMR)	83 ft
   Code Zone (CZ)	90 ft

   Pipe Letter	Pipe Load	Pipe Size
   1	300 MBH	[latex]\frac{1}{2}[/latex] in
   2	150 MBH	[latex]\frac{1}{2}[/latex] in
   3	450 MBH	[latex]\frac{3}{4}[/latex] in

   5 PSG Piping System

   Type of Gas	Natural Gas
   Piping Material	Screwed carbon steel pipe
   System Pressure – 5 PSI	5 psig
   Table Used	A.5 (a) Imperial
   Table Allowable Pressure Drop	2.5 psig
   Longest Measured Run (LMR)	84 ft
   Code Zone (CZ)	125 ft
   Proofed Longest (ELR)

   Pipe Letter	Pipe Load	Pipe Size
   A	5,000 MBH	[latex]1\frac{1}{4}[/latex] in
   B	450 MBH	[latex]\frac{1}{2}[/latex] in
   C	5,450 MBH	[latex]1\frac{1}{4}[/latex] in
   D	175 MBH	[latex]\frac{1}{2}[/latex] in
   E	5,625 MBH	[latex]1\frac{1}{4}[/latex] in

   Proof of G – B
   [latex]\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}[/latex]

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

Competency E5

Self-Test 1

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

Self-Test 3

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

Self-Test 1

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

Self-Test 2

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

Self-Test 3

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