LPG Storage Tank Skid Unit: Complete Technical Guide
LPG storage tank skid unit (also called LPG skid-mounted station or LPG站) is an integrated modular system that combines LPG storage, transfer, and dispensing functions on a single steel base, designed for safe, portable, and rapid deployment of LPG handling operations .
⚡ Key Benefits at a Glance
• Rapid installation: Pre-assembled and pre-tested, on-site setup in 1-3 days vs. weeks for conventional stations
• Portability: Easy transport via truck, ideal for temporary sites or remote locations
• Space-efficient: Compact footprint, requires 30-50% less area than traditional facilities
• Cost-effective: Reduces engineering, labor, and construction expenses by 20-40%
• Safety: Factory-integrated safety systems with fewer on-site connections, minimizing leak points
• Scalability: Modular design allows capacity expansion without full system replacement
�� Core Components & Structure
1. Main Structural Elements
Component | Description | Key Specifications |
Storage Tank | Horizontal/vertical pressure vessel for LPG | - Capacity: 5-100 m³ (common: 10-30 m³)<br>- Design pressure: 1.77 MPa (standard)<br>- Material: Q345R (Chinese) or SA516 (ASME) carbon steel<br>- Thickness: 8-16 mm (varies with volume/pressure) |
Steel Skid Base | Structural frame supporting all equipment | - Material: Q235B carbon steel<br>- Load capacity: 1.2× total system weight<br>- Forklift pockets for easy movement<br>- Anti-corrosion coating (epoxy/polyurethane) |
Process Piping | LPG transfer network | - Material: Seamless steel pipe (GB/T 8163 or ASTM A106)<br>- Pressure rating: ≥2.5 MPa<br>- Valves: Ball valves, check valves, safety relief valves (set at 1.77 MPa) |
2. Functional Systems
System | Components | Primary Functions |
Transfer System | LPG pump (hydrocarbon pump), vaporizer (optional) | - Unloading from tanker to storage<br>- Filling cylinders/vehicles<br>- Tank-to-tank transfer<br>- Flow rate: 50-200 L/min |
Filling Station | Electronic scales, filling guns/hoses | - Precise cylinder filling (±0.2 kg accuracy)<br>- Vehicle refueling (optional dispenser) |
Safety Systems | Pressure relief valves, excess flow valves, flame arrestors, leak detectors, emergency shut-off | - Overpressure protection<br>- Leak monitoring and automatic shutdown<br>- Fire safety: Foam system + water spray (for 10+ m³ tanks) |
Control & Instrumentation | PLC control panel, pressure/temperature gauges,****** indicators | - Automatic operation with manual override<br>- Remote monitoring capability<br>- Data logging for compliance |
Auxiliary Systems | Water cooling, vapor recovery | - Tank temperature control<br>- Vapor recycling to reduce emissions<br>- Waste LPG recovery |
�� Technical Specifications (Typical 15 m³ Unit)
• Tank Dimensions: 6,224 × 1,820 × 2,410 mm (L×D×H)
• Wall Thickness: Cylinder: 10 mm, Heads: 12 mm
• Working Pressure: 1.6 MPa (max operating), Test pressure: 2.22 MPa
• Design Temperature: -19°C to +50°C
• Service Life: 15 years (certified)
• Weight: ~8,500 kg (15 m³ unit)
��️ International Design Standards & Codes
Compliance with these standards is mandatory for safety certification:
Region | Primary Standards | Key Requirements |
China | GB 50156, GB 150 | Design pressure ≥1.77 MPa, 100% radiographic inspection |
USA/Europe | ASME Section VIII, EN 12542 | Material certification, pressure testing, safety factor ≥4:1 |
Global | NFPA 58, OSHA 1926.153 | Installation distance: ≥5m from buildings, proper ventilation |
�� Applications & Use Cases
1. Domestic Cylinder Filling: Small to medium capacity (5-30 m³) for residential/commercial LPG distribution
2. Industrial Gas Supply: 20-50 m³ units for factories, construction sites, and remote mining operations
3. Mobile Refueling: Transportable skids for agricultural equipment, forklifts, and LPG-powered vehicles
4. Emergency Backup: Rapid deployment for disaster relief or temporary energy supply
5. Temporary Projects: Construction sites, events, or remote military installations
6. Border/Remote Areas: Ideal for regions with limited infrastructure
�� Installation & Operation Guidelines
Step 1: Site Preparation
• Concrete foundation: 150-200 mm thickness, load-bearing capacity ≥15 t/m²
• Safety distance: ≥10 m from buildings, ≥5 m from property lines
• Lightning protection system and proper drainage required
Step 2: Installation Process
1. Transport skid unit to site (using low-bed trailer)
2. Position on prepared foundation (using crane or forklift)
3. Anchor skid to concrete (4-6 anchor bolts)
4. Connect utility lines (power, water, gas inlet)
5. Leak test (1.5× working pressure with nitrogen)
6. System commissioning and operator training
Step 3: Routine Maintenance
Interval | Tasks |
Daily | Pressure/temperature checks, leak inspections, safety device verification |
Weekly | Filter cleaning, pump performance test, emergency shutdown test |
Monthly | Valve function test, scale calibration, control system diagnostics |
Annual | Full inspection by certified technician, pressure vessel recertification |
�� Capacity Selection Guide
Choose based on daily consumption and refueling frequency:
Daily LPG Consumption | Recommended Capacity | Ideal Application |
<500 kg | 5-10 m³ | Small communities, rural areas |
500-2,000 kg | 10-20 m³ | Medium-sized towns, small industries |
2,000-5,000 kg | 20-30 m³ | Industrial parks, large residential areas |
>5,000 kg | 30-50 m³+ | Refineries, large industrial complexes |
⚠️ Critical Safety Considerations
1. Overpressure Protection: Safety valves set at 1.77 MPa with discharge to safe location
2. Leak Detection: Install gas detectors at ≤3 m intervals, connected to automatic shut-off system
3. Fire Prevention:
￮ Foam fire suppression system (8 L/min·m² coverage)
￮ Water spray cooling for tank (0.5 L/s·m flow rate)
￮ No open flames within 25 m radius
4. Electrical Safety: All equipment must be explosion-proof (Ex d IIB T4) rated
5. Emergency Response:
￮ Clearly marked emergency shutdown buttons
￮ Spill containment (capacity ≥110% of tank volume)
￮ Operator training on leak response and evacuation procedures
�� Comparison: Skid-Mounted vs. Conventional LPG Stations
Feature | Skid-Mounted Unit | Conventional Station |
Installation Time | 1-3 days | 4-8 weeks |
Cost | 30-50% lower | Higher (engineering + construction) |
Footprint | Compact (30-50% smaller) | Larger |
Mobility | Yes (can be relocated) | Fixed |
Safety | Factory-integrated systems | On-site assembly, more leak points |
Expansion | Modular (add skids) | Full reconstruction needed |
Ideal For | Temporary/remote sites, rapid deployment | Permanent installations with stable demand |
✅ Key Design Recommendations for Manufacturers
1. Material Selection: Use Q345R/SA516 Grade 70 with 1 mm corrosion allowance
2. Pressure Vessel Design:
￮ Minimum safety factor: 4:1
￮ 100% radiographic inspection of welds
￮ Hydrostatic test at 1.25× design pressure
3. Modular Integration:
￮ Centralize control systems for easy operation
￮ Standardize connections for quick replacement
￮ Include lifting lugs and forklift pockets for mobility
4. Compliance: Certify to local pressure vessel regulations (GB, ASME, EN) before delivery
�� Purchasing Checklist
□ Pressure vessel certification (valid for 15 years)
□ Safety devices: Relief valves, excess flow valves, flame arrestors
□ Leak detection system with automatic shutdown
□ Operation manual with maintenance schedule
□ Training for operators (minimum 8 hours)
□ Spare parts kit (O-rings, gaskets, valves)
□ 12-month warranty on all components
LPG storage tank skid units represent the future of flexible, safe, and cost-effective LPG distribution. Whether for emergency response, remote industrial sites, or temporary projects, their modular design and rapid deployment capabilities make them an essential solution in the gas equipment industry.
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