Common use of Change of Design Clause in Contracts

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table 6.7 shall require design qualification testing as specified in the table. Table 6.1. - Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Plastic liners Tensile properties 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. Sulfide stress cracking resistance 6.3.2.6. Sustained load crack resistance 6.3.3.3. Stress corrosion cracking 6.3.3.2. Shear strength 6.3.4.2. Glass transition temperature 6.3.4.3. Softening/Melting temperature 6.3.6. Fracture mechanics*/ 6.7. 6.7. */ Not required if flawed cylinder test approach in paragraph A.7. of Appendix A is used. Cylinder diameter D, mm > 140 ≤ 140 Direction of testing transverse longitudinal Width of test piece, mm 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, °C -50 -50 Mean of 3 specimens Impact strength, J/cm² Individual specimen 30 35 40 60 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 - Minimum actual burst pressure. In addition, calculations must be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 Burst A.13 Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment A.7 Extreme temperature/cycle X * X * X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table 6.7 shall require design qualification testing as specified in the table. Table 6.1. - Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Plastic liners Tensile properties properties‌ 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. Sulfide stress cracking resistance resistance‌ 6.3.2.6. Sustained load crack resistance 6.3.3.3. Stress corrosion cracking cracking‌ 6.3.3.2. Shear strength 6.3.4.2. Glass transition temperature temperature‌ 6.3.4.3. Softening/Melting temperature 6.3.6. Fracture mechanics*/ 6.7. 6.7. */ Not required if flawed cylinder test approach in paragraph A.7. of Appendix A is used. Cylinder diameter D, mm > 140 ≤ 140 Direction of testing transverse longitudinal Width of test piece, mm 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, °C -50 -50 Mean of 3 specimens 30 35 40 60 Impact strength, J/cm² Individual specimen 30 35 40 60 24 28 32 48 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 - Minimum actual burst pressure. In addition, calculations must be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 Burst A.13 Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment A.7 Extreme temperature/cycle X * X * X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table 6.7 shall require design qualification testing as specified in the table. Table 6.1. - Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Plastic liners Tensile properties 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. Sulfide stress cracking resistance 6.3.2.6. Sustained load crack resistance 6.3.3.3. Stress corrosion cracking 6.3.3.2. Shear strength 6.3.4.2. Glass transition temperature 6.3.4.3. Softening/Melting temperature 6.3.6. Fracture mechanics*/ 6.7. 6.7. */ Not required if flawed cylinder test approach in paragraph A.7. of Appendix A is used. Table 6.2 - Impact test acceptable values Cylinder diameter D, mm > 140 ≤  140 Direction of testing transverse longitudinal Width of test piece, mm 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, °C C -50 -50 Mean of 3 specimens 30 35 40 60 Impact strength, J/cm² Individual specimen 30 35 40 60 24 28 32 48 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 - Minimum actual burst pressure. In addition, calculations must be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 Burst A.13 Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment A.7 Extreme temperature/cycle X * X * X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4type

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table 6.7 shall require design qualification testing as specified in the table. Table 6.1. - Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Plastic liners Tensile properties 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. Sulfide stress cracking resistance 6.3.2.6. Sustained load crack resistance 6.3.3.3. Stress corrosion cracking 6.3.3.2. Shear strength 6.3.4.2. Glass transition temperature 6.3.4.3. Softening/Melting temperature 6.3.6. Fracture mechanics*/ 6.7. 6.7. */ Not required if flawed cylinder test approach in paragraph A.7. of Appendix A is used. Cylinder diameter D, mm > 140 ≤  140 Direction of testing transverse longitudinal Width of test piece, mm 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, °C C -50 -50 Mean of 3 specimens Impact strength, J/cm² Individual specimen 30 35 40 60 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 - Minimum actual burst pressure. In addition, calculations must be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 Burst A.13 Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment A.7 Extreme temperature/cycle X * X * X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table 6.7 shall require design qualification testing as specified in the table. Table 6.1. - Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Plastic liners Tensile properties 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. Sulfide stress cracking resistance 6.3.2.6. Sustained load crack resistance 6.3.3.3. Stress corrosion cracking 6.3.3.2. Shear strength 6.3.4.2. Glass transition temperature 6.3.4.3. Softening/Melting temperature 6.3.6. Fracture mechanics*/ 6.7. 6.7. */ Not required if flawed cylinder test approach in paragraph A.7. of Appendix A is used. 84 Cylinder diameter D, mm > 140 ≤  140 Direction of testing transverse longitudinal Width of test piece, mm 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, °C C -50 -50 Mean of 3 specimens Impact strength, J/cm² Individual specimen 30 35 40 60 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 - Minimum actual burst pressure. In addition, calculations must be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 Burst A.13 Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment A.7 Extreme temperature/cycle X * X * X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table 6.7 shall require design qualification testing as specified in the table. Table 6.1. - Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Plastic liners Tensile properties 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. Sulfide stress cracking resistance 6.3.2.6. Sustained load crack resistance 6.3.3.3. Stress corrosion cracking 6.3.3.2. Shear strength 6.3.4.2. Glass transition temperature temperature‌ 6.3.4.3. Softening/Melting temperature 6.3.6. Fracture mechanics*/ 6.7. 6.7. */ Not required if flawed cylinder test approach in paragraph A.7. of Appendix A is used. Cylinder diameter D, mm > 140 ≤ 140 Direction of testing transverse longitudinal Width of test piece, mm 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, °C -50 -50 Mean of 3 specimens Impact strength, J/cm² Individual specimen 30 35 40 60 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 - Minimum actual burst pressure. In addition, calculations must be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 Burst A.13 Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment A.7 Extreme temperature/cycle X * X * X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table 6.7 shall require design qualification testing as specified in the table. Table 6.1. - Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Fibers Plastic liners Tensile properties 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. Sulfide stress cracking resistance 6.3.2.6. Relevant paragraph of this annex Steel Aluminium Resins Fibers Plastic liners Sustained load crack resistance 6.3.3.3. Stress corrosion cracking 6.3.3.2. Shear strength 6.3.4.2. Glass transition temperature 6.3.4.3. Softening/Melting temperature 6.3.6. Fracture mechanics*/ 6.7. 6.7. */ Not required if flawed cylinder test approach in paragraph A.7. of Appendix A is used. 66 Cylinder diameter D, mm > 140 ≤  140 Direction of testing transverse longitudinal Width of test piece, mm 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, °C C -50 -50 Mean of 3 specimens 30 35 40 60 Impact strength, J/cm² Individual specimen 30 35 40 60 24 28 32 48 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 - Minimum actual burst pressure. In addition, calculations must be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 Burst A.13 Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment assessment A.7 Extreme temperature/cycle X * X * X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4type

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table Table 6.7 below shall require design qualification testing as specified in the table. 77 Table 6.1. - 6.1 Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Plastic liners Tensile properties 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. Sulfide Sulphide stress cracking resistance 6.3.2.66.3.2.4. Sustained load crack resistance 6.3.3.3. Stress corrosion cracking 6.3.3.2. Shear strength 6.3.4.2. Glass transition temperature 6.3.4.3. Softening/Melting temperature 6.3.6. Fracture mechanics*/ mechanics* 6.7. 6.7. */ * Not required if flawed cylinder test approach in paragraph A.7. of Appendix A to this annex is used. Table 6.2 Impact test acceptable values Cylinder diameter D, mm D [mm] > 140 ≤ 140 Direction of testing transverse longitudinal Width of test piece, mm piece [mm] 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, temperature [°C C] -50 -50 Impact strength [J/cm²] Mean of 3 specimens Impact strength, J/cm² Individual specimen 30 35 40 60 Individual specimen 24 28 32 48 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 1) - Minimum actual burst pressure. In addition, calculations must shall be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 2) - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 A.12. Burst A.13 X * X X X A.13. Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment A.7 Extreme temperature/cycle X * X * X X A.14. Environmental test X X X A.15. Bonfire X X X A.16. Penetration X X X X A.17. Flaw tolerance X X X X A.18. High temperature creep X X X A.19. Stress rupture X X X A.20. Drop test X X A.21. Permeation X A.24. PRD performance X X X A.25. Boss torque test X X A.27. Natural gas cycling X A.6. LBB assessment X X X X X X X X X X X X X X X X X X A.7. Extreme temperature/cycle X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 A.12. Burst X X X X A.13. Ambient temperature/cycle X X X X A.1. Tensile X X † X † A.2. Impact (steel) X X † X † A.9.2. Coating* X X X X X = required * = Except where no protective coating is used † = Tests on liner material Table 6.6 Critical production inspection requirements Type Cylinder type Critical dimensions X X X X Surface finish X X X X Flaws (ultrasonic or equivalent) X X X Hardness of metal cylinders and metal liners X X X Hydrostatic proof test X X X X Leak test X Markings X X X X X = required 80 Table 6.7 Change of design Type of test High temp: Creep A.18 Permeation A.21 CNG Design change Burst Hydrostatic A.12 Cycling ambient temp: A.13 Environm. A.14 Bonfire A.15 Penetration A.16 Flaw tolerance A.17 Stress rupture A.19 Drop test A.20 Boss torque A.25 Cycling A.27 PRD performance A.24 Fibre manufacturer X X X* X† Metallic cylinder or liner material X X X* X X* X X* Plastic liner material X X X† Fibre material X X X X X X X X† Resin material X X X X Diameter change ≤ 20 per cent X X Diameter change > 20 per cent X X X X* X Length change ≤ 50 per cent X X‡ Length change > 50 per cent X X X‡ Working pressure change ≤ 20 per cent@ X X Dome shape X X X† Opening size X X Coating change X End boss design X† Change in manuf. process X X Pressure relief device X X X = required * Test not required on metal (CNG-1) designs: † Test only required on all-composite (CNG-4) designs ‡ Test only required when length increases @ Only when thickness changes proportional to diameter and/or pressure change.

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table 6.7 shall require design qualification testing as specified in the table. Table 6.1. - Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Plastic liners Tensile properties 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. Sulfide stress cracking resistance 6.3.2.6. Sustained load crack resistance 6.3.3.3. Stress corrosion cracking 6.3.3.2. Shear strength 6.3.4.2. Glass transition temperature 6.3.4.3. Softening/Melting temperature 6.3.6. Fracture mechanics*/ 6.7. 6.7. */ Not required if flawed cylinder test approach in paragraph A.7. of Appendix A is used. 84 Cylinder diameter D, mm > 140 ≤  140 Direction of testing transverse longitudinal Width of test piece, mm 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, °C C -50 -50 Mean of 3 specimens 30 35 40 60 Impact strength, J/cm² Individual specimen 30 35 40 60 24 28 32 48 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 - Minimum actual burst pressure. In addition, calculations must be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 Burst A.13 Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment A.7 Extreme temperature/cycle X * X * X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table 6.7 shall require design qualification testing as specified in the table. Table 6.1. - Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Fibers Plastic liners Tensile properties 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. Sulfide stress cracking resistance 6.3.2.6. Relevant paragraph of this annex Steel Aluminium Resins Fibers Plastic liners Sustained load crack resistance 6.3.3.3. Stress corrosion cracking 6.3.3.2. Shear strength 6.3.4.2. Glass transition temperature 6.3.4.3. Softening/Melting temperature 6.3.6. Fracture mechanics*/ 6.7. 6.7. */ Not required if flawed cylinder test approach in paragraph A.7. of Appendix A is used. Cylinder diameter D, mm > 140 ≤  140 Direction of testing transverse longitudinal Width of test piece, mm 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, °C C -50 -50 Mean of 3 specimens Impact strength, J/cm² Individual specimen 30 35 40 60 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 - Minimum actual burst pressure. In addition, calculations must be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 Burst A.13 Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment assessment A.7 Extreme temperature/cycle X * X * X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4

Change of Design. A design change is any change in the selection of structural materials or dimensional change not attributable to normal manufacturing tolerances. Minor design changes shall be permitted to be qualified through a reduced test program. Changes of design specified in table 6.7 shall require design qualification testing as specified in the table. E/ECE/324 Rev.2/Add.109 Regulation No. 110 page 64 Annex 3 Table 6.1. 6.1 - Material design qualification test Relevant paragraph of this annex Steel Aluminium Resins Fibres Plastic liners Tensile properties 6.3.2.2. 6.3.3.4. 6.3.5. 6.3.6. Impact properties 6.3.2.3. Bending properties 6.3.2.4. Weld examination 6.3.2.5. 6.3.2.2 6.3.3.4 6.3.5 6.3.6 Sulfide stress cracking resistance 6.3.2.6. 6.3.2.4 Impact properties 6.3.2.3 Sustained load crack cracking resistance 6.3.3.3. 6.3.3.3 Stress corrosion cracking 6.3.3.2. 6.3.3.2 Shear strength 6.3.4.2. 6.3.4.2 Glass transition temperature 6.3.4.3. 6.3.4.3 Softening/Melting temperature 6.3.6. 6.3.6 Fracture mechanics*/ 6.7. 6.7. */ mechanics * 6.7 6.7 * Not required if use flawed cylinder test approach in paragraph A.7. of Appendix A is used. A.7 (appendix A) Cylinder diameter D, mm > 140 ≤ 140 Direction of testing transverse longitudinal Width of test piece, mm 3 - 5 > 5 - 7.5 > 7.5 - 10 3 to 5 Test temperature, °(C -50 -50 Mean of 3 specimens Impact strength, J/cm² Individual specimen 30 35 40 60 Table 6.3 - Minimum actual burst values and stress ratios CNG-1 All-metal CNG-2 Hoop-wrapped CNG-3 Fully-wrapped CNG-4 All-composite Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] Stress ratio [MPa] Burst pressure [MPa] All metal 45 450 Glass 2.75 50 1) 3.65 70 1) 3.65 73 Aramid 2.35 47 3.10 60 1) 3.1 62 Carbon 2.35 47 2.35 47 2.35 47 Hybrid 2) 2) 2) Note 1 - Minimum actual burst pressureE/ECE/324 Rev.2/Add.109 Regulation No. In addition, calculations must be performed in accordance with paragraph 6.5. of this annex to confirm that the minimum stress ratio requirements are also met. Note 2 - Stress ratios and burst pressures shall be calculated in accordance with paragraph 6.5. of this annex. 110 page 65 Annex 3 Table 6.4 - Cylinder design qualification tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4 A.12 Burst A.13 Ambient temp/cycle A.14 Acid environment test A.15 Bonfire A.16 Penetration A.17 Flaw tolerance A.18 High temp. creep A.19 Stress rupture A.20 Drop test A.21 Permeation A.24 PRD performance A.25 Boss torque test A.27 Natural gas cycling A.6 LBB assesment A.7 Extreme temperature/cycle X * X * X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X = required * = Not required for cylinders designed to ISO 9809 (ISO 9809 already provides for these tests). Table 6.5 - Batch tests Test and annex reference Cylinder type CNG-1 CNG-2 CNG-3 CNG-4