Bottom loading and unloading arm - China Petroleum Chemical Equipment Network

底部装卸臂

Core Equipment High-precision multi-degree-of-freedom rotary joint Emergency breakaway valve (core safety component) API standard dry quick coupling Liquid-gas dual-pipe integrated structure Spring balance actuator

Core Technologies

Dual-pipeline closed-circuit loading and unloading technology High-reliability rotary sealing technology Emergency disconnection automatic shut-off sealing technology Lightweight anti-corrosion material and structural design Ergonomic balanced operation technology

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产品介绍

Detailed Introduction

The bottom loading and unloading arm is a specialized fluid transfer equipment, mainly used for the bottom loading and unloading of oil products, chemical media, liquefied gases and other dangerous goods in tank trucks, tankers and storage tanks.

It adopts a bottom operation design instead of the traditional top open operation, which can realize fully enclosed loading and unloading, effectively reduce volatilization and leakage, and meet environmental protection and safety requirements. The structure is mostly composed of inner arm, outer arm, balancing system, rotary joint, emergency cut-off valve, quick connector, grounding device and control system. It has the characteristics of flexible rotation, reliable sealing, corrosion resistance, high pressure resistance and long service life.

Compared with top loading arms, bottom loading and unloading arms can improve operation efficiency, reduce static electricity hazards, and are easier to match with vapor recovery systems, making them widely used in petrochemical depots, wharves, chemical plants and logistics transportation.

Types and Characteristics of Equipment

Type

Bottom sealed dual-line loading and unloading arm for liquid and gas, suitable for bottom loading operations of refined oil and chemical liquid tank trucks, a special equipment for safe loading and unloading in highway storage and transportation.

Features

Core Features

Bottom loading and unloading with fully closed operation, extremely low oil vapor emission, meeting environmental protection and explosion-proof requirements. Dual-pipeline structure (liquid phase + gas phase), realizing simultaneous loading/unloading and vapor recovery. Multi-joint rotary design with large movement range, adapting to parking positions of different vehicle models. Built-in balance mechanism for easy operation and hovering at any position. Equipped with emergency breakaway valve and dry quick coupling as standard to prevent pull-off and leakage. Compliant with international standards such as API, ADR and EN, suitable for overseas markets including the Middle East, Russia and Tanzania. Main body made of aluminum alloy or stainless steel, featuring corrosion resistance, lightweight and long service life.

底部装卸臂

Designed for safe and enclosed bottom loading and unloading of tank trucks.

底部装卸臂

Reduces vapor emission and static hazards for petroleum and chemical media.

底部装卸臂

High-efficiency fluid transfer equipment for storage terminals and logistics stations.

Basic Principles and System Composition

Basic Working Principle

Basic Principle:Quickly connect to the tank truck through the bottom interface, complete liquid loading/unloading and oil vapor return in a closed system to achieve leak-free and volatile-free operation. The breakaway valve will shut off automatically in case of accidental pulling to prevent medium leakage.

Overall System Composition

System Composition

Column and support base: Fix and support the entire arm assembly Rotary joint group: Enables flexible multi-directional rotation Liquid phase pipe and gas phase pipe: Parallel dual pipes for medium delivery and gas recovery respectively Balance spring / air cylinder mechanism: Enables easy operation and positioning of the arm Dry quick coupling: Fast connection with tank trucks with reliable sealing Emergency breakaway valve: Automatically seals and shuts off flow in case of accidental disconnection Operating handle: Manual control of lifting, telescoping and steering

Basic Principles and System Composition

Operating Procedures

PreparationPark the tank truck securely, apply the parking brake, and place wheel chocks.Connect the static grounding wire and inspect valves and couplings. ConnectionDeploy the inner and outer arms → Align with the bottom interface of the tank truck.Push and lock the dry coupling, then open the valves. OperationOpen the gas phase valve first to balance pressure → Then open the liquid phase valve.Start the pump / begin gravity loading/unloading, and monitor liquid level and pressure. FinishingClose the liquid phase valve → Close the gas phase valve.Drain residual liquid in the arm (by nitrogen or self-pressure) and let stand for 30 seconds. DisconnectionRotate reversely to close the dry coupling → Disconnect the joint.Retract and lock the arm, then remove the static grounding wire. SafetyCore: Fully closed operation, anti-static, gas first then liquid, shut off flow before disconnection.