CNG Cylinders

<p>CNG Cylinders Type I: Material &amp; Production</p> <p> CNG Boiler &amp; Pressure Vessel 2009 27 2552 </p> <p>National Metal and Materials Technology Center (MTEC) National Science and Technology Development Agency (NSTDA)</p> <p>Overview</p> <p>Gas Filter</p> <p>Switch</p> <p>ECU</p> <p>Electronic Spark Advance Control Pressure Regulator</p> <p>Injector Rail Pressure Gauge Refilling Valve</p> <p>Tank &amp; Safety Valve</p> <p>Material0.20</p> <p>Gas capacity-weight ratio (m3/kg)</p> <p>(BS 5045) (HOS) (BS 1045/1288) Carbon manganese Chromium molybdenum steel steel</p> <p>0.15</p> <p>(BS 399/400) Carbon steel 0.10</p> <p>0.05 1900 1920 1940 1960 1980 2000</p> <p>Year</p> <p> Primary alloying element: C, Si, Mn Secondary alloying element: Cr, Mo, Ni Trace element: P, S</p> <p>Material</p> <p>High strength steels for CNG cylindersSteel Grade CM (BS 5045) NCM (BS 5045) 4340 (AISI) 4320(AISI) 4130(AISI) 34CrMo 4 (DIN 17200) From MTEC Tank %C 0.37 max. 0.270.35 0.380.43 0.170.22 0.280.33 0.30.37 0.22 %Si 0.10.35 0.10.35 0.150.35 0.150.35 0.150.35 0.4 max. 0.41 %Mn 0.4-0.9 0.5-0.7 0.6-0.8 0.450.65 0.4-0.6 0.6-0.9 0.66 %Cr 0.81.2 0.50.8 0.70.9 0.40.6 0.81.1 0.91.2 1.15 %Mo 0.150.25 0.4-0.7 0.2-0.3 0.2-0.3 0.150.25 0.150.3 0.42 %Ni 0.5 max. 2.3-2.8 1.652.0 1.652.0 0.25 max. NA 0.17 %P 0.05 max. 0.05 max. 0.035 max. 0.035 max. 0.025 max. 0.035 max. 0.08 %S 0.05 max. 0.05 max. 0.040 max. 0.040 max. 0.025 max. 0.035 max. 0.06</p> <p>Material</p> <p>High strength steels for CNG cylindersMechanical Properties YS (N/mm2) UTS (N/mm2) Elongation (%) IE (J) at -50C ISO 9809 990 1100 14 60 Faber 890 990 14 35 4340 - I 1004.3 1118.7 17 70 4340 - II 957.6 1046.6 18 81</p> <p>4340-I: Tempering @ 590C, 4340II: Tempering @ 620C</p> <p>Material</p> <p>Microstructure</p> <p>Material</p> <p>Seamless pipe Advantages - Thin wall (Thickness to OD ratio = 0.2%) - Dimension accuracy (prevent eccentricity and thickness deviation) - Improved inner surface (prevent roll-in scale) Standard: JIS G 3429 (Seamless Steel Tubes for High Pressure Gas Cylinder) Grade: STH 22 (Chrome-molybdenum steel tube) Chemical composition: C = 0.33-0.38%, Si = 0.15-0.35%, Mn = 0.40-0.90%, P = 0.030% max. S = 0.030%(max), Ni = 0.25%(max), Cr = 0.80-1.20%, Mo = 0.15-0.30%</p> <p>Production</p> <p>CNG TypeType-1: Type-2: Type-3: Type-4: Metal Cylinders Metal liner - Hoop wrapped cylinders Metal liner - Fully wrapped cylinders All Composite cylinders</p> <p>Weight100% 55-65% 25-45% 30%</p> <p>Cost40% 80-95% 90-100% 90%</p> <p>Type 1</p> <p>Type 2</p> <p>Type 3</p> <p>Type 4</p> <p>Production</p> <p>NGV Cylinder Weight vs. Cost0.303 1 2</p> <p>8</p> <p>7 5 14 10 9 11</p> <p>0.20</p> <p>4</p> <p>6</p> <p>0.1013</p> <p>15 12</p> <p>1. Steel : billet 2. Steel : plate 3. Steel : tube 4. HS steel : plate 5. HS aluminum : billet 6. Aluminum : tube/E-glass hoop 7. Steel : plate/E-glass hoop 8. Steel : billet/E-glass hoop 9. Aluminum : tube/E-glass full 10.Aluminum : plate/E-glass full 11.Aluminum : plate/S-glass full 12.Aluminum : thin/carbon full 13.Plastic/carbon full 14.Plastic/E-glass full 15.Plastic/hybrid full</p> <p>Specific Weight (lb/scf)</p> <p>0.00 $0.00</p> <p>$0.50</p> <p>$1.00</p> <p>$1.50</p> <p>Total Cost ($/scf)</p> <p>Ref. Compressed Natural Gas Storage Optimization for Natural Gas Vehicles Final Report, Dec., 1996, Prepared by IGT and Powertech Labs for GRI</p> <p>Production</p> <p>CNG cylinder type-I :most commonly used in ThailandCNG Type : 1 steel cylinder Material : BS5045 Steel / AISI4340 Cylinder Volume : 70 Litters Weight : 70-80 kg Working pressure : 200 bars Mileage : about 200 km/refill Periodic Test : every 5 years Service Life : 20 years</p> <p>Production CNG Cylinder Type - I</p> <p>Detailed manu. process (steel billet)Heating Cupping Hot Extrusion Wall thickness reduction</p> <p>External Internal shot blasting</p> <p>Shell Inspection</p> <p>Hot spinning</p> <p>Neck Machining</p> <p>Quenching &amp; Temping</p> <p>shot blasting</p> <p>(www. faber-italy. com)</p> <p>Production CNG Cylinder Type - I</p> <p>Detailed manu. process (steel billet)Hardness Test Shell Inspection Neck Threading</p> <p>Ultrasonic Inspection</p> <p>Marking</p> <p>Volumetric Expansion Hydro test</p> <p>Surface Coating</p> <p>Final Operation</p> <p>Shell Inspection</p> <p>(www. faber-italy. com)</p> <p>Production CNG Cylinder Type - I</p> <p>Main manu. process (steel plate)</p> <p>Cold Deep Drawing</p> <p>Annealing</p> <p>Cold Deep Drawing</p> <p>Flow Forming</p> <p>Hot Neck Spinning</p> <p> Main machines required</p> <p>- Drawing hydraulic press: tonnage 1500 ton up - Flow forming machine - Hot spinning machine</p> <p>Production CNG Cylinder Type - I</p> <p>Main manu. process (steel tube)</p> <p>Base Spinning</p> <p>Base Shaping Internal Dressing</p> <p>Flowing Forming</p> <p>Hot Neck Spinning</p> <p> Main Machines Required- Flow Forming Machine - Hot Spinning Machine</p> <p>Production CNG Cylinder Type - I</p> <p>Prototype testing (ISO 11439)1. Material tests 2. Hydrostatic Pressure Burst test 3. Pressure Cycling Test 4. Leak Before Break Test 5. Bonfire Test 6. Gunfire TestBonfire test</p> <p>Gunfire test Leak before break testGunfire test</p> <p>Thank You for Your Attention!!!</p>