| Annex 1: PRODUCT SPECIFICATION Technical Parameters & Inspection Standards for 159/219/232mm Oxygen & Nitrogen Cylinders 1. Basic Cylinder Parameters - 159mm cylinder: Standard ISO 9809-3; Declaration of Conformity provided - 219mm cylinder: Standard ISO 9809-3; Declaration of Conformity provided - 232mm cylinder: Standard ISO 9809-1; Declaration of Conformity provided - Applicable media: Oxygen cylinder (common permanent gas) / Nitrogen cylinder (inert gas) - Nominal water capacity: 159mm-13.4L / 219mm-40L / 232mm-47L - Working pressure (WP): 150 bar - Material: 37Mn seamless steel tube; Mill Test Certificate (MTC) from steel mill provided - Design service life: 20 years (standard ISO carbon steel cylinder life); - Mandatory periodic inspection cycle: Oxygen cylinder - every 3 years (common permanent gas); Nitrogen cylinder - every 5 years (inert gas) 2. Dimensional Specifications - 159mm cylinder: O.D. 159mm, O.D. tolerance +/-1.59mm; standard wall thickness 4.4mm, min. wall thickness >=4.4mm; overall height (incl. shoulder, excl. base) 854+/-10mm; bottom configuration: concave; neck thread PZ27.8, effective thread length >=22mm; straightness <=0.3% of cylinder length; roundness/ovality tolerance <=1% of cylinder length; shoulder transition radius ~R80 - 219mm cylinder: O.D. 219mm, O.D. tolerance +/-2.19mm; standard wall thickness 5.7mm, min. wall thickness >=5.7mm; overall height (incl. shoulder, excl. base) 1315+/-15mm; bottom configuration: concave; neck thread PZ27.8, effective thread length >=22mm; straightness <=0.3% of cylinder length; roundness/ovality tolerance <=1% of cylinder length; shoulder transition radius ~R120 - 232mm cylinder: O.D. 232mm, O.D. tolerance +/-2.32mm; standard wall thickness 5.3mm, min. wall thickness >=5.3mm; overall height (incl. shoulder, excl. base) 1356+/-15mm; bottom configuration: concave; neck thread PZ27.8, effective thread length >=22mm; straightness <=0.3% of cylinder length; roundness/ovality tolerance <=1% of cylinder length; shoulder transition radius ~R120 3. Pressure, Burst & Gas Tightness Test Parameters - 159mm cylinder: Hydrostatic test pressure 250 bar; hold time 30s, max. permanent expansion 10%; min. burst pressure 414.8 bar (batch burst test data archived); gas tightness test 150 bar, hold 1 min; wall thickness: sampling inspection; fatigue cycle test data archived - 219mm cylinder: Hydrostatic test pressure 250 bar (standard for 150bar is 225bar); hold time 30s, max. permanent expansion 10%; min. burst pressure 411 bar (batch burst test data archived); gas tightness test 150 bar, hold 1 min; wall thickness: sampling inspection; fatigue cycle test data archived - 232mm cylinder: Hydrostatic test pressure 250 bar; hold time 30s, max. permanent expansion 10%; min. burst pressure 400 bar (batch burst test data archived); gas tightness test 150 bar, hold 1 min; wall thickness: sampling inspection; fatigue cycle test data archived 4. Weight & Filling Parameters - 159mm tare weight: 17.4kg, weight tolerance per standard - 219mm tare weight: Oxygen cylinder 47.8kg / Nitrogen cylinder 43.3kg, weight tolerance per standard - 232mm tare weight: 50kg, weight tolerance per standard - Standard filling factor for oxygen/nitrogen; max. gas mass per cylinder - Tare weight marking standard 5. Coating, Painting, Stamping & Marking Specifications - Coating system: single topcoat - Oxygen cylinder body color: pure white, dry film thickness 80-120 um - Nitrogen cylinder body color: dark gray, dry film thickness 80-120 um - Coating adhesion and salt spray test duration (marine anti-corrosion) - Permanent statutory marking: roll stamping (recommended) / paint printing - stamping content: manufacturer code, ISO 9809 standard number, water capacity, working pressure, hydrostatic test pressure, material 37Mn, serial number, production date, inspection cycle, manufacturing license number - Custom printing requirements: customer logo position, logo size, font color, layout drawing
Annex 2: FILLING OPERATION REQUIREMENTS Product | Category | Core Technical Requirements | Remarks | 159/219/232 Oxygen Cylinder | Valve Requirements | 1. Neck PZ27.8 tapered thread; oxygen-specific oil-free cylinder valve; fully degreased valve body; thread fit without slippage or chipped teeth; 2. Valve hydrostatic test 250 bar, 180 bar hold for 1 min, zero leakage, smooth opening and closing; 3. Valve port compatible with general industrial oxygen pressure regulators in Nigeria; valve factory certificate and degreasing inspection report included; 4. Strictly prohibited to mix with nitrogen / flammable gas cylinder valves. |
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| Filling Equipment | 1. Filling connector compatible with PZ27.8; entire oxygen pipeline and filling equipment fully degreased; pipeline pressure rating >= 250 bar; 2. Pressure gauge range 0-250 bar, accuracy class 1.5; safety valve set at 157.5 bar; instrument calibration certificates archived; 3. Dedicated explosion-proof oxygen filling station; anti-static grounding + emergency shut-off valve; physically isolated from flammable gas filling area. |
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| Pressure Requirements | 1. Standard filling at 20 deg C: 148-150 bar (certificate-specified parameters); 2. Nigeria high-temperature practical filling: 140-145 bar (actual filling operation); 3. Residual pressure: >= 1 bar, venting prohibited; 4. Routine customer cylinder exchange residual: 3-5 bar recommended. | Residual pressure must not be vented below 1 bar to prevent air ingress and explosion risk; mandatory requirement by Nigerian gas station safety regulators. |
| Full Cylinder Criteria | 1. At 20 deg C, measured pressure 135-145 bar qualifies as properly filled; 2. Ambient temperature > 20 deg C: convert to 20 deg C standard pressure using gas temperature-pressure coefficient; high-temperature gauge reading does not count as overfill; 3. > 145 bar: vent pressure; < 135 bar: replenish pressure; permanent gases use pressure as acceptance basis. | After filling, let cylinders stand at ambient temperature for 24 h and re-measure pressure before packing and shipment. |
| Operation & Control | 1. Before filling: verify cylinder stamp, manufacturing and inspection validity; evacuate empty cylinders to remove moisture and impurities; 2. Operators must maintain oil-free workwear and tools; monitor cylinder temperature rise during filling; stop immediately if abnormal temperature rise; 3. After filling: install plastic protective cap; affix English product qualification label on cylinder body; 4. Use IPPC fumigated solid wood pallets for full-pallet packing and securing. | Complete filling original records archived |
| Environmental & Climate | 1. Filling workshop: -20 deg C to +45 deg C; stop batch filling when ambient temperature > 45 deg C; 2. Finished products stored away from light; temporary outdoor storage at dock <= 4 h; prioritize cool cabin positions for container loading; 3. Ambient humidity <= 85%; valve lubricated with oxygen-compatible anti-rust grease for ocean shipping corrosion resistance. | Adapted to Nigeria tropical rainy climate; prevent cylinder paint blistering and corrosion. |
| Application | Oxygen |
| 159/219/232 Nitrogen Cylinder | Valve Requirements | 1. Valve PZ27.8 thread; compatible with GB standard PZ27.8 nitrogen valve; valve body hydrostatic test 250 bar, 180 bar hold for 1 min, zero leakage; 2. Export valve with original factory material report and certificate; valve body marked with pressure and model; 3. Nitrogen inert valve does not require flame arrestor; optional compatibility with locally common outlet interfaces in Nigeria. |
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| Filling Equipment | 1. Filling connector compatible with PZ27.8; pipeline pressure rating >= 250 bar; pressure gauge 0-250 bar / Class 1.5; safety valve set at 157.5 bar; 2. Filling system with anti-static grounding; dedicated nitrogen filling station; avoid mixed filling; 3. Factory filling equipment calibration records retained; Nigerian customs may require filling equipment calibration documents. |
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| Pressure Requirements | 1. Standard filling at 20 deg C: 148-150 bar (certificate-specified parameters); 2. Nigeria high-temperature practical filling: 140-145 bar (actual filling operation); 3. Residual pressure: >= 1 bar, venting prohibited; 4. Routine customer cylinder exchange residual: 3-5 bar recommended. | Residual pressure must not be vented below 1 bar to prevent air ingress and explosion risk; mandatory requirement by Nigerian gas station safety regulators. |
| Full Cylinder Criteria | 1. At 20 deg C, measured pressure 135-150 bar qualifies as properly filled; 2. Nigeria high-temperature environment (> 30 deg C): convert to 20 deg C equivalent pressure using ideal gas formula; container internal pressure rise due to heat does not count as overfill; 3. > 150 bar: vent pressure; < 135 bar: replenish nitrogen; issue single-cylinder filling record. | Before container loading, let cylinders stand to cool and re-measure pressure to avoid overpressure detention in sealed shipping containers. |
| Operation & Control | 1. Before filling: verify cylinder ISO 9809 stamp (hydrostatic pressure, manufacturing date, 37Mn material), inspection validity; evacuate and purge empty cylinders; 2. Retain complete filling records; each cylinder number corresponds to filling data; 3. Container loading: upright fixing, wood pallet packing, protective caps fitted. |
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| Environmental & Climate | 1. Domestic filling environment: -20 deg C to +45 deg C; stop filling when > 45 deg C; 2. Adapted to Nigeria tropical climate: avoid direct sunlight during storage and shipping; container ventilation; temporary outdoor storage at dock not exceeding 4 h; 3. Ambient humidity < 85%; valve coated with anti-rust grease to prevent high-humidity corrosion during ocean shipping. | Nigeria year-round high temperature 25-38 deg C; sealed container high temperature during ocean shipping is a key point for pressure control. |
| Application | Nitrogen |
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Annex 3: Instructions for Use (Per TSG 23-2021 Safety Technical Regulation for Gas Cylinders; GB/T 5099.3 Seamless Steel Gas Cylinders) I. Service Life & Validity Period 1. Basic Design Service Life - Standard factory-marked service life is 20 years (cylinder stamp: 20Y), which is the statutory baseline lifespan. - With proper management, complete documentation, adequate maintenance, and passing all inspections, the service life may be extended to a maximum of 30 years upon third-party safety assessment. Without assessment, cylinders must be withdrawn from inspection and prepared for scrapping upon reaching 20 years. 2. Mandatory Periodic Inspection Cycle (Key Validity Period) - Inert gases (nitrogen, argon, high-purity non-corrosive gases): inspection every 5 years - Common permanent gases (oxygen, hydrogen, CO2, air, etc.): inspection every 3 years (most common) - Corrosive media, seawater / humid corrosion environments, diving cylinders: inspection every 2 years 3. Special Time-Limited Rules - If decommissioned and stored for more than one inspection cycle, cylinders must be inspected and qualified before refilling and reuse. - In case of external impact, corrosion, leakage, or abnormal weight, send for inspection immediately -- do not wait for the cycle to expire. - If inspection fails, the cylinder is condemned for scrapping and cannot be repaired for reuse. II. Daily Inspection (Mandatory Before Each Shift / Each Use) 1. Cylinder Body Visual Inspection - Paint film must be intact; large-area paint loss, peeling, or corrosion covering > 1/3 of the surface warrants vigilance for corrosion thinning. - No cracks, bulges, wrinkles, or deep dents: dent depth > 2 mm is a direct hazard; dents with scratches are highly likely to result in scrapping. - No severe impact, drop, or deformation; cylinder shoulder and base are critical vulnerability points. - Verify cylinder stamp: manufacturing date, WP (working pressure), TP (hydrostatic test pressure), design service life, and last inspection date -- ensure all are within validity. - If cylinder weight differs significantly from factory-marked weight (weight loss = internal wall corrosion), stop use immediately and measure wall thickness. 2. Accessory Inspection - Cylinder cap must be intact and tightened; both anti-shock rings must be present and undamaged. - Cylinder valve must be free from deformation and oil contamination (oxygen cylinders strictly prohibit grease); apply soapy water to valve port and threads -- no bubble leakage permitted. - If valve is frozen, thaw only with warm water <= 40 deg C; strictly prohibit flame heating, metal tool striking, or wrench force. - Pressure regulator and gauge must be within calibration validity, free from damage, leakage, or pointer sticking. 3. Operating Environment & Status Inspection - Maintain distance >= 10 m from open flame; avoid direct sunlight, boilers, radiators, and welding heat sources. - Store upright and secured against tipping; prohibit horizontal placement for long-term use (except acetylene). - Cylinder must retain >= 0.05 MPa residual pressure; thorough venting is strictly prohibited (to prevent air backflow and internal wall oxidation). - Filling pressure must strictly not exceed nominal WP (conventional 15 MPa cylinder filling limit: 15 MPa); overpressure filling is strictly prohibited. III. Routine Maintenance 1. Cleaning & Anti-Corrosion Maintenance - After each use, wipe clean oil stains and water marks with a dry cloth; during rainy seasons and in chemically corrosive environments, remove rust and apply anti-rust paint monthly. - Prolonged contact with strong acids, strong alkalis, or salt water is prohibited; use soft pads to isolate cylinders from hard metal objects during transport and stacking. 2. Valve Maintenance - Every six months, disassemble and clean internal valve impurities; apply dedicated oil-free lubricating grease to threads (oxygen valves strictly prohibit any grease). - If valve seal gaskets are aged, threads are stripped, or internal leakage occurs, do not disassemble or repair privately -- send to inspection station for parts replacement. 3. Storage Maintenance - Warehouse must be cool, ventilated, and temperature <= 40 deg C; store by category and in separate stacks; maintain separation distance between flammable and oxidizing gases. - For long-term idle storage: vent pressure to 0.05 MPa, tighten cylinder cap, store indoors in a dry place; prohibit outdoor exposure to rain and sun. 4. Transport & Loading/Unloading Maintenance - Lift and place gently; prohibit rolling, dropping, throwing, or dragging; secure and strap cylinders in vehicle compartments to avoid mutual impact. - Before loading: close valve tightly, fit cylinder cap, and ensure anti-shock rings are in place. IV. Direct Scrapping Criteria (Mandatory Scrapping if Any One Condition is Met) - Reaching the 20-year design life without safety assessment; or reaching 30 years after assessment. - Cylinder body cracks, bulges, laminations, or deep wrinkles that cannot be repaired. - Remaining wall thickness after corrosion / impact < 90% of design wall thickness. - Excessive denting or damage accompanied by cracks or scratches. - Valve body rupture or severely damaged threads that cannot be replaced or repaired. - Failure of hydrostatic test, gas tightness test, or ultrasonic wall thickness measurement.
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