A loading arm is selected around the transfer duty: material, design conditions, connection, reach, motion, operating sequence, and maintenance expectations. Geometry and process compatibility must be reviewed together.
System variables
- Transfer duty
- Document each material, direction of flow, loading or unloading mode, expected design conditions, cleaning or purge needs, and duty pattern.
- Connection basis
- Identify top or bottom connection, connection type and size, vehicle nozzle range, hose use, and any vapor or return connection.
- Reach envelope
- Map swivel location, horizontal and vertical reach, vehicle variation, parking position, obstructions, and operator approach.
- Materials basis
- Provide the owner-approved compatibility requirements for wetted materials, seals, drainage, temperature exposure, and environment.
Best-fit contexts
- Repetitive truck or rail transfer where a defined motion path and connection range can be supported from fixed piping or structure.
- Projects coordinating process piping, loading access, operator reach, parked equipment, controls, and containment in one bay.
Interfaces to coordinate
- Facility piping, supports, pumps, valves, meters, instruments, isolation, drainage, purge, vapor, and process controls.
- Swivel joints, arm balance or support, hose, connection hardware, vehicle nozzle, and operator handling method.
- Platform and gangway geometry, structural loads, grounding or bonding basis, containment, traffic, and maintenance access.
Limits and review points
- Reach alone does not establish suitability; duty, connection loads, compatibility, pressure, temperature, and operating sequence also matter.
- Generic web guidance cannot select wetted materials, seals, process controls, or governing design requirements.
- Final process and mechanical design must be validated by the owner, responsible engineer, and equipment suppliers for the stated duty.
Project-brief checklist
- Material list and current safety data, owner compatibility basis, design conditions, and flow direction.
- Connection type, size, orientation, vehicle nozzle range, and top or bottom loading position.
- Dimensioned reach sketch showing source piping, swivel point, vehicle, parking envelope, and obstructions.
- Operating sequence, control and isolation philosophy, drainage or purge needs, and maintenance method.
- Existing drawings and photos plus owner, process engineer, and mechanical reviewer contacts.