Appendix 1: Self-Test Answer Keys

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

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