Types Of Marine Loading Arm

Types Of Marine Loading Arm

Introduction

Marine Loading / unloading arms area unit used to transfer liquids from liquid carrier ships to the jetty, so the liquid can transfer via pipelines from the jetty to the tank space or from a tank to liquid carrier ship.

Marine Loading Arm types

Basically, the loading/unloading arms area unit classified as four types.

1. Fully Balanced Marine Arm
2. Double Counterweight Marine Arm
3. Rotary Counterweight Marine Arm

Fully Balanced Marine Arm (FBMA)

The totally Balanced Marine Arm is totally balanced within the empty condition. These sorts have an easy structure use 2 counterweights.

• Main counterweight and
• Sub-counterweight

These counterweights can ensure full balance all told positions. the most counterweight is employed connected to the inboard arm and therefore the sub-counterweight is connected to the outboard arm.

These will be operated with few personnel, ANd have an easy-to-maintain structure. As a result, these are the foremost usually used variety of marine loading arms.

Read: Classification of marine Steam Engine

Double Balancing Marine Arm (DCMA)

The DCMA loading arm uses 2 independent counterweights, similarly as a pantograph to confirm full balance all told positions. Separate counterweights area unit using balance the inboard and outboard sections of the arm.

The outboard counterweights area unit assembled on a beam, setup to AN layabout sheave that rotates around the same horizontal axis because of the trunnion removal elbow (style fifty swivel joint).

The rotations are adjusted to balance the outboard arm through a pantograph cable to a second sheave that is set up to the outboard arm at the Apex removal elbow (style forty swivel joint). The inboard counterweights ar fastened to the inboard counterweight extension beam and adjusted to assure correct leveling of the loading arm assembly.

A feature of the DCMA may be a smaller space needed for rear counterweight movement than with the RCMA. this sort of counterweight is widely used for loading and unloading terribly giant tankers.

Rotary Counterweight Marine Arm (RCMA)

The Rotary Counterweight Marine Arm is additionally totally balanced all told positions once empty. These ar used in the main in loading and unloading medium to massive tankers. Today, RCMA area unit wide pantograph LNG terminals. RCMA uses one counterweight to balance each inboard and outboard arms at the same time (Refer figure).

The counterweights, assembled on the beam interdependent of the lower block. The mechanical device sheave and pantograph cable to transfer movement from to inboard arm to outboard arm or vise-verse. It needed more room for counterweight movement.

Conclusion

Marine loading arms area unit used to take the movements like the tide, low tide, transfer movement of ships, ocean currents, etc.,

Depend upon the service condition the Marine loading arm sorts are going to be elect.