Crane Selection Guide for Air Separation & Cylinder Filling
Cranes for industrial gas (oxygen/nitrogen/argon/hydrogen) filling stations are configured across four process areas: air separation, storage tanks, filling, and inspection. Air separation equipment installation uses truck cranes (50–200 t), storage tank maintenance uses explosion-proof LD/LH type cranes (5–10 t, Ex d IIB T4), cylinder handling in the filling station uses an explosion-proof KBK system (0.5–2 t), and cylinder inspection uses jib cranes (0.5–2 t). Total plant investment: approximately $22,000–$89,000. The air separation cold box is an oversized item requiring on-site installation.
Air Separation Area: Temporary Lifting for Oversized Equipment Installation
The core of an air separation unit (ASU) is the cold box and distillation column, with diameters of 3–6 m, heights of 30–60 m, and individual component weights of 50–200 t. ASU installation involves oversized lifting, typically performed with large truck cranes or crawler cranes (50–200 t) during the equipment installation phase. Cranes inside the ASU workshop primarily support post-installation maintenance lifting rather than equipment installation. We recommend installing LD-type explosion-proof cranes (5–10 t) around the ASU equipment for maintenance lifting of external piping and valves on the cold box. Kelude's cranes for the air separation area feature explosion-proof Ex d IIB T4 design, as oxygen-enriched zones may form in the ASU workshop where oxygen leaks can accumulate—standard electrical equipment poses a fire hazard in oxygen-rich environments.
Maintenance of vacuum piping on liquid oxygen and liquid nitrogen storage tanks in the ASU workshop requires crane assistance. Vacuum piping weighs 200–500 kg/m and ranges from 5–15 m in length. Kelude recommends installing a circular KBK rail system or monorail crane around the ASU cold box to cover the piping maintenance area outside the cold box. Crane operation in the ASU workshop requires careful attention to the maximum hook height—given the dense overhead piping around the cold box, the crane bridge height and upper hook limit position must be precisely verified to avoid collision with piping and instrumentation on top of the cold box. Crane investment for the air separation area: approximately $15,000–$37,000.
Storage Tank Area: Explosion-Proof Cranes for Cryogenic Tanks
Industrial gas storage falls into two categories: atmospheric cryogenic tanks (liquid oxygen at −183 °C, liquid nitrogen at −196 °C, liquid argon at −186 °C) and high-pressure gas tanks (oxygen at 200 bar, hydrogen at 300 bar). Tank diameters range from 3–8 m, with weights of 5–20 t. The storage tank area requires explosion-proof cranes primarily for valve replacement, vacuum layer inspection, and maintenance of external tank piping. Recommended configuration: LD or LH type explosion-proof cranes (5–10 t) with explosion protection class Ex d IIB T4. Vacuum jacket maintenance on cryogenic tanks requires crane assistance—vacuum pumps and vacuum detection equipment weighing 200–500 kg must be lifted to the top interface of the tank. Kelude's explosion-proof cranes for the storage tank area feature a fully explosion-proof system that meets the requirements of GB 50058 (explosion-proof specification).
The liquid oxygen tank area is the highest explosion-protection zone. Liquid oxygen itself is non-flammable but strongly supports combustion—any grease or oil contacting liquid oxygen can trigger a violent reaction or even explosion. The grease used on cranes in the tank area must be perfluoropolyether (PFPE)-based inert grease (oxygen-compatible); standard mineral-based grease is strictly prohibited. Kelude supplies explosion-proof cranes for liquid oxygen tank areas with PFPE grease and Teflon-coated wire rope. Crane investment for the tank area: approximately $22,000–$52,000. For high-pressure hydrogen tank areas (hydrogen explosive range 4–75%), explosion-proof requirements are more stringent—we recommend Ex d IIC T4 explosion protection class (hydrogen requires one level higher protection than standard gases).
Filling Station: Explosion-Proof KBK System for Cylinder Handling
The gas filling station is where cryogenic liquid or high-pressure gas from storage tanks is transferred into cylinders. Filling equipment includes filling manifolds, cryogenic pumps, and vaporizers. Cylinder handling within the filling station (40 L standard steel cylinders, approx. 50 kg empty, approx. 65 kg full) is the most frequent lifting operation. Recommended configuration: explosion-proof KBK system (0.5–2 t) with chain hoist. The filling station must be classified as an explosion-proof area (Zone 1 or Zone 2), and all electrical equipment must carry explosion-proof certification. Kelude's KBK system for filling stations uses an explosion-proof electric hoist (Ex d IIB T4) with a stainless steel rail system to prevent corrosion. The KBK rail runs along the filling manifold direction, covering the flow path from the cylinder staging area to the filling position and on to the finished goods area.
Cylinders require inspection before filling (visual inspection + thread check) and leak testing after filling. The KBK system handles cylinder transfer between the inspection station and the leak test station. Kelude recommends a dual KBK rail system in the filling station—one rail for empty cylinders from staging to the filling position, and a second for full cylinders from filling to the finished goods area—to prevent mixing of empty and full cylinders. Recommended lifting speed for the filling station KBK system: 4/1 m/min two-speed. For filling stations handling specialty gases such as hydrogen or acetylene, the explosion protection class must be upgraded to Ex d IIC T4. KBK investment for the filling station: approximately $7,400–$22,000. For large filling stations (5,000+ cylinders per day), we recommend an automated cylinder transfer line integrated with the KBK system.
Cylinder Inspection Area: Lifting Plan for Hydrostatic and Leak Tests
Per TSG R0006 (Safety Technical Supervision Regulation for Gas Cylinders), the periodic inspection interval for cylinders is 3–5 years. The inspection sequence includes: visual inspection, wall thickness measurement, hydrostatic test, leak test, drying, painting, and marking. Cylinder weight: 50–65 kg each. Recommended configuration: jib crane (0.5–2 t) combined with a KBK workstation crane. The hydrostatic test machine weighs 300–800 kg, and the leak test tank weighs 200–500 kg, both requiring lifting for maintenance. Kelude's inspection area solution uses a jib crane to cover the test machine maintenance zone and a KBK rail system to cover the cylinder flow area. Cylinder movement in the inspection area is frequent but individual cylinders are light—a KBK manual trolley with cylinder fixtures (clamp-type or jaw-type) enables single-operator handling.
Air Separation Maintenance LDExplosion-proof5-10t Ex d IIB T4 | Tank Farm LD/LHExplosion-proof5-10t Oxygen-Compatible Lubrication | Filling Station KBKExplosion-proof0.5-2t Cylinders Handling |
Cylinders Detection Jib Crane0.5-2t+KBK | Hydrogen Explosion-proof Ex d IIC T4Maximum Grade | total plant investment 15-60Wanquancoverage |
Crane Configuration Comparison for Industrial Gas Filling Stations
| Workshop Section | Model Type | tonnage | Explosion Protection Class | special requirements | investment |
|---|---|---|---|---|---|
| Air Separation | LDExplosion-proof | 5-10t | Ex d IIB T4 | Oxygen-Compatible for Oxygen-Enriched Environment | 10-2510,000 |
| Storage Tank | LD/LH | 5-10t | Ex d IIB T4 | Perfluoropolyether (PFPE)Grease | 15-3510,000 |
| Filling | KBKExplosion-proof | 0.5-2t | Ex d IIB T4 | Double-Girder+Cylinders Fixture | 5-1510,000 |
| Detection | Jib Crane | 0.5-2t | Standard | Cylinders Transfer | 3-1010,000 |
| complete plant | Combination | 0.5-10t | Zone | Fullcoverage | 15-6010,000 |
Kelude Heavy Industry's crane solutions for the industrial gas sector span the full workflow—air separation, storage tanks, filling operations, and detection. Two areas deserve special attention: the oxygen-compatible lubrication system for liquid oxygen tank farms and the Ex d IIC T4 explosion-proof configuration for hydrogen filling stations—both are the most overlooked yet critical safety considerations in crane selection for the gas industry.
Oxygen-Compatible Lubrication PFPE-Inert Grease+Teflon (PTFE)coated wire rope, Liquid Oxygen Environmentsafe and reliable | Explosion-proof Fullcoverage Ex d IIB T4(Standard)/Ex d IIC T4(Hydrogen), Zone Explosion-proof Precision Matching | Cylinders Handling System KBKDouble-Girder Explosion-proof+Cylinders Fixture+manual trolley, Fillingefficiency improvement Approx.50% |
Explosion-Proof Crane FAQ: Safety, Lubrication & More
Q: Why is an explosion-proof crane mandatory in industrial gas filling stations?
A: Oxygen leaks during the filling process can create an oxygen-enriched atmosphere (O₂ concentration > 23%), where arcs or sparks from standard electrical equipment can cause instant ignition. Hydrogen is even more hazardous (explosive range 4–75%), requiring Ex d IIC T4-rated equipment. Kelude offers verification services for explosion-proof certifications.
Q: What special lubrication requirements apply to cranes in liquid oxygen storage areas?
A: Standard mineral grease can explode on contact with liquid oxygen. Only inert perfluoropolyether (PFPE)-based grease is permitted. Kelude cranes installed in liquid oxygen zones come standard with oxygen-compatible grease and Teflon-coated wire rope. Never use non-oxygen-compatible grease in these areas!
Q: Is a KBK crane or manual handling more cost-effective for moving cylinders in a filling station?
A: For daily filling volumes above 1,000 cylinders, a KBK crane is recommended. The typical payback period is 12–18 months, factoring in labor savings and reduced cylinder damage. Kelude provides return-on-investment calculations for KBK systems in filling stations.
Q: What type of crane is needed for cold box installation in an air separation workshop?
A: Cold box installation typically uses a truck crane or crawler crane (50–200 t) as temporary construction equipment. Fixed cranes inside the workshop are primarily for maintenance hoisting (5–10 t). Kelude offers consulting services for construction and installation lifting plans.
