3-Axle 40m³ Cryogenic Liquid Semi-trailer for LNG/LOX with Vacuum-Powder Insulation & BPW Axles

1. Dimensions & Tank Specifications

Overall External Dimensions (by axle configuration):

2-axle model (light-duty, short-haul): 8.0–9.5 m (L) × 2.55 m (W) × 3.3–3.6 m (H); Wheelbase: 4.8–5.8 m

3-axle model (medium-duty, inter-regional): 11.0–13.5 m (L) × 2.55 m (W) × 3.5–3.9 m (H); Wheelbase: 6.5–8.2 m

4-axle model (heavy-duty, long-haul): 13.8–16.0 m (L) × 2.55–2.8 m (W) × 3.7–4.1 m (H); Wheelbase: 8.0–10.5 m

Tank Core Parameters:

Volume Capacity: 18–28 m³ (2-axle); 30–45 m³ (3-axle); 48–60 m³ (4-axle) – calibrated for cryogenic liquid density (e.g., LNG: 420 kg/m³, LOX: 1141 kg/m³)

Tank Material: Austenitic stainless steel (304L or 316L); thickness: 6–10 mm (tank shell); 10–14 mm (tank head, for pressure resistance)

Tank Structure: Single-compartment cylindrical design (standard); multi-compartment (optional, for mixed cryogen transport, e.g., LNG + LIN)

2. Insulation System (Cryogenic Core)

Insulation Type: Vacuum-powder insulation (industry standard for cryogens below -150°C)

Insulation Material: High-purity expanded perlite (pearlite) or fumed silica – filled between inner and outer tank shells

Vacuum Degree: ≤ 5×10⁻³ Pa (maintained via getter materials to slow air leakage); heat flux: ≤ 0.5 W/(m·K)

Boil-off Rate (BOR):

LNG (30 m³ tank): ≤ 0.3% of total volume per day (≤ 0.09 m³/day)

LOX/LIN (40 m³ tank): ≤ 0.25% of total volume per day (≤ 0.1 m³/day)

BOR Testing: Conducted at 25°C ambient temperature (no external heat source)

Outer Tank Protection:

Material: Carbon steel Q345B (anti-corrosion treatment: sandblasting + epoxy primer + polyurethane topcoat)

Thickness: 4–6 mm (prevents physical damage to the insulation layer during transport)

3. Pressure & Safety Systems

Pressure Ratings:

Working Pressure: 0.6–1.2 MPa (LNG); 1.0–1.6 MPa (LOX/LIN) – matches cryogen vapor pressure at -162°C/-183°C/-196°C

Design Pressure: 1.5× working pressure (for safety margin); hydrostatic test pressure: 1.25× design pressure

Relief Valve Setting: 1.1× working pressure (auto-release excess vapor to prevent overpressure)

Safety Valves & Devices:

Main Relief Valve: Spring-loaded, stainless steel 316L (1 per tank; capacity: ≥ 1.5× maximum vapor generation rate)

Secondary Safety: Rupture disc (burst pressure: 1.2× design pressure) – backup for relief valve failure

Emergency Shut-off Valve (ESV): Pneumatically/hydraulically controlled (closes within 10 seconds if leakage or overpressure is detected)

Monitoring Systems:

Liquid Level Sensor: Magnetic float type (accuracy: ±1%); digital display in tractor cab + remote alarm

Pressure Transducer: Measures tank internal pressure (range: 0–2.0 MPa); data logged via optional GPS tracker

Temperature Sensor: Monitors inner tank wall temperature (range: -200°C to 50°C); alerts for abnormal heating

4. Loading & Unloading Systems

Transfer Pumps:

Type: Cryogenic centrifugal pump (stainless steel 316L wetted parts); seal type: double mechanical seal (cryogenic-resistant fluororubber)

Flow Rate: 50–100 m³/h (LNG); 30–80 m³/h (LOX/LIN) – powered by tractor PTO or independent diesel generator (optional)

Pre-cooling Port: Dedicated valve for pump pre-cooling (uses cryogen vapor to avoid thermal shock)

Valves & Connections:

Cryogenic Valves: Ball/butterfly valves (stainless steel 316L; operating temperature: -200°C to 80°C); equipped with extended stems (prevents handle freezing)

Quick-Connect Fittings: Dry-disconnect type (ISO 10284 standard) – no cryogen spillage during connection/disconnection

Piping Material: Stainless steel 316L (seamless pipe); insulation: foam glass + aluminum foil (prevents condensation and heat ingress)

5. Axle, Suspension & Brakes

Axle Configuration:

Axle Type: Heavy-duty cryogenic-adapted axles (brand options: BPW, SAF-Holland, FUWA); rated load: 11,500–13,000 kg/axle

Axle Lubrication: Low-temperature grease (operating range: -40°C to 120°C) – prevents grease hardening in cold environments

Suspension System:

Primary: Airbag suspension (2–3 airbags/axle; brand: Continental, Firestone) – adjustable height (±50 mm) for loading dock alignment

Damping: Heavy-duty hydraulic shock absorbers (1/axle) – reduces vibration to protect the insulation layer and tank structure

Braking System:

Service Brakes: Air disc brakes (all axles; rotor material: high-carbon steel with anti-corrosion coating)

Safety Systems: ABS (Anti-lock Braking System, ECE R10) + EBS (Electronic Braking System, ECE R13) + ASR (Anti-Slip Regulation)

Parking Brake: Spring-actuated mechanical brake (acts on all axles; reliable at -40°C low temperatures)

6. Medium Compatibility & Customization

Typical Cryogenic Liquids & Adaptations:

Customization Options:

Heating System: Electric trace heating (for valves/pipes; maintains -10°C to 20°C to prevent freezing)

Remote Monitoring: 4G GPS tracker (real-time data: level, pressure, temperature, location)

Multi-compartment Tank: 2–3 separate tanks (for different cryogens; each with independent safety systems)

Extended Insulation: For extreme cold regions (e.g., Siberia) – BOR reduced to ≤ 0.2%/day

7. Compliance & Certifications

Global Standards:

Pressure Vessel Standards: ASME BPVC Section VIII (U.S.), EN 13458 (Europe), GB 150 (China)

Transport Safety: ECE R13 (brakes), ECE R66 (rollover protection), DOT 49 CFR (U.S.), ADR (Europe for dangerous goods)

Cryogenic Specific: ISO 16900 (cryogenic vessels), GB 18442 (China for LNG vehicles)

Testing Certifications:

Hydrostatic Test: 1.25× design pressure (30 minutes holding time)

Vacuum Integrity Test: ≤ 5×10⁻³ Pa (24-hour vacuum retention)

Cold Shock Test: Tank filled with LIN (-196°C) for 48 hours (no leakage or deformation)

Product Introduction

This 3-Axle 40m³ Cryogenic Liquid Semi-trailer for LNG/LOX with Vacuum-Powder Insulation & BPW Axles is a high-performance solution engineered for the safe, efficient transport of ultra-low-temperature liquids-specifically liquefied natural gas (LNG, -162°C) and liquefied oxygen (LOX, -183°C). Its core competitiveness lies in the advanced vacuum-powder insulation system (minimizing boil-off loss), food-grade 316L stainless steel tank (resisting cryogenic corrosion), and heavy-duty BPW axles (ensuring long-haul stability). Compliant with global standards (ASME BPVC Section VIII, EN 13458, GB 18442), it addresses critical needs for energy companies, industrial gas manufacturers, and LNG filling stations, balancing low operational 损耗 (BOR ≤ 0.3%/day for LNG) and maximum safety for cryogenic transport.

Product Content Introduction

3-Axle 40m³ Cryogenic Liquid Semi-trailer for LNG/LOX with Vacuum-Powder Insulation & BPW Axles features a cryogen-optimized tank design that prioritizes thermal insulation and durability. The tank is constructed from 8mm-thick 316L austenitic stainless steel-withstand extreme low temperatures down to -196°C without brittleness, and resist corrosion from LOX's oxidizing properties. Its 40m³ capacity (tank dimensions: 9.8m L × 2.1m D) uses a single-compartment cylindrical structure, while the vacuum-powder insulation layer (filled with high-purity expanded perlite) achieves a vacuum degree of ≤ 5×10⁻³ Pa. This design delivers a boil-off rate (BOR) of ≤ 0.3%/day for LNG and ≤ 0.25%/day for LOX-translating to just 0.12m³ of LNG loss daily, significantly reducing operational costs for long-haul routes.

3-Axle 40m³ Cryogenic Liquid Semi-trailer for LNG/LOX with Vacuum-Powder Insulation & BPW Axles integrates a multi-layer safety system to mitigate cryogenic transport risks. It operates at a working pressure of 0.8–1.2 MPa (adjustable for LNG/LOX), with a design pressure of 1.5× working pressure for safety margin. A spring-loaded stainless steel relief valve (set at 1.1× working pressure) automatically releases excess vapor, while a rupture disc (burst pressure: 1.2× design pressure) acts as a backup. An emergency shut-off valve (ESV) installed on the main piping closes within 10 seconds if leakage or overpressure is detected-triggered manually via cab controls or automatically by pressure/temperature sensors. The outer tank (Q345B carbon steel, 5mm thick) is coated with anti-corrosion epoxy primer + polyurethane topcoat, protecting the insulation layer from road debris.

3-Axle 40m³ Cryogenic Liquid Semi-trailer for LNG/LOX with Vacuum-Powder Insulation & BPW Axles is equipped with an efficient, cryogen-compatible loading/unloading system. It uses a cryogenic centrifugal pump (316L wetted parts, double mechanical seal with cryogenic fluororubber) with a flow rate of 80m³/h-filling the 40m³ tank in 30 minutes and emptying it in 25 minutes. The system includes 2 stainless steel cryogenic ball valves (extended stems to prevent handle freezing) and dry-disconnect quick-connect fittings (ISO 10284 standard)-eliminating cryogen spillage during connection, which avoids frostbite risks and environmental hazards. A dedicated pre-cooling port uses cryogen vapor to pre-cool the pump to -160°C before operation, preventing thermal shock to the pump components.

3-Axle 40m³ Cryogenic Liquid Semi-trailer for LNG/LOX with Vacuum-Powder Insulation & BPW Axles boasts a stable 3-axle and suspension setup tailored for low-temperature environments. It adopts 3 BPW heavy-duty axles (each rated 13,000kg) with low-temperature grease (operating range: -40°C to 120°C)-preventing grease hardening and axle wear in cold climates (e.g., winter in Northern Europe or Canada). The airbag suspension (2 Continental airbags/axle) adjusts height ±50mm to align with LNG/LOX storage tanks at filling stations, while air disc brakes (all axles, high-carbon steel rotors with anti-corrosion coating) ensure reliable stopping even at -30°C. 12R22.5 radial tires (16PR load rating) with winter tread (optional) provide strong traction on icy roads, critical for safe transport in cold regions.

3-Axle 40m³ Cryogenic Liquid Semi-trailer for LNG/LOX with Vacuum-Powder Insulation & BPW Axles meets global compliance and offers flexible customization for diverse needs. It holds CE (Europe), DOT (North America), and CCC (China) certifications, plus ASME BPVC Section VIII approval for pressure vessels. For temperature monitoring, an ultrasonic liquid level sensor (accuracy ±1%) and a -200°C to 50°C temperature transducer display real-time data in the tractor cab, with optional 4G GPS tracking to log location, pressure, and level remotely. Customization options include electric trace heating for valves/pipes (prevents freezing in -40°C environments), a multi-compartment tank (for simultaneous LNG + LIN transport), and an extended insulation layer (reducing BOR to ≤ 0.2%/day for ultra-long hauls).

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