Hydrogen sulfide 800L horizontal cylinder 20-foot container loading and transportation plan

Hydrogen sulfide 800L horizontal cylinder 20-foot container loading and transportation plan

800L horizontal cylinder 20-foot container loading plan report (two-layer stacking optimized version)

introduction

This report focuses on the two-layer stacking transportation plan of 800L horizontal cylinders in 20-foot containers. The original single-layer solution was structurally optimized, and the number of loads was increased to 14 (7 horizontally arranged on each layer). Safe stacking was achieved by adding steel plate partitions and vertical lashing systems. The scheme design takes the core goals of maximizing space utilization (volume utilization increased from 21.8% to 43.6%), fixed system redundancy design (meeting 2 times the dynamic load requirement) and compliance verification (in compliance with Amendment 41-22 of the IMDG Rules), and provides technical specifications for multimodal transportation of high-pressure vessels.

Basic parameter confirmation

Container parameters

The core parameters of the 20-foot standard container (20GP) are shown in the table below. Its structural strength and space size provide a feasible basis for two-layer stacking:

Cylinder parameters

The constraint analysis of the physical characteristics of the 800L horizontal cylinder on the stacking plan is as follows：

Loading plan design

Horizontal arrangement optimization solution (two-layer stacking)

Spatial layout: 7 cylinders are arranged horizontally along the length of the container on each floor. The layers are separated by 5mm thick Q235 steel plate partitions. The specific parameters are as follows:

• Lower layer arrangement: cylinder diameter 800mm × 7 = 5600mm, 298mm difference in length from container, 30mm thick polyurethane buffer material is used to fill the gap

• Upper layer arrangement: misaligned with the lower layer (offset 400mm), and the position of the cylinder is fixed through the positioning groove on the partition plate

• Total load: 14 cylinders (7×2)

Stability verification: Through ANSYS simulation, under the condition of 0.5g lateral acceleration, the maximum displacement of the cylinder is 2.3mm, meeting the requirements of the IMDG rule ≤5mm.

Fixed system design

Anti-rolling measures (double-layer reinforcement)

Lower layer fixed:

• A 50mm thick neoprene pad is laid between the cylinder and the bottom plate (friction coefficient μ=0.6)

• Place 45° triangular wooden wedges (hardwood material, compressive strength ≥30MPa) at both ends, embedded depth ≥150mm

Upper layer fixed:

• Welding limit stops on the surface of the partition (height 100mm, spacing 800mm)

• Fill high-density polyethylene foam between cylinders (compression modulus ≥ 200MPa)

Lashing reinforcement system (three-dimensional restraint)

Horizontal lashing: Follow the original plan for cross-fixing of two cylinders per group, 12mm diameter steel wire rope (breaking tension ≥ 26kN), and 3 locks per group

Vertical lashing: add 8 new 16mm diameter steel wire ropes (breaking tension ≥ 45kN), specific layout:

• There are 4 channels on each side of the upper cylinder, which are connected to the lifting rings on the top of the container at a 45° angle.

• The pre-tightening force of each wire rope is 5kN, calibrated using a torque wrench

• Add a protective cushion layer (thickness ≥10mm) to all lashing points to prevent scratches on the cylinder surface

Stacking load-bearing analysis (new chapter)

Partition strength check:

• Material: Q235 steel plate, thickness 5mm, allowable stress [σ]=156MPa

• Load: The total weight of the 7 bottles on the upper level is 9.1 tons, and the uniform load is 656kPa

• Deflection calculation: f=5ql⁴/(384EI)=0.8mm (much smaller than the limit L/250=23.6mm)

Floor load verification:

• Single cylinder contact area: 0.8m×2.05m=1.64m²

• Pressure: 1300kg/1.64m²=7925Pa (<1000kPa floor limit)

Interlaminar shear force:

• Friction between the partition and the lower cylinder: F=μN=0.6×91000N=54600N

• Shear strength: τ=54600N/(2.352m×5.898m)=4020Pa (<Q235 shear strength 125MPa)

Safety regulations and compliance

Adaptation revision of IMDG rules