Shaft Power Meter | Marine-and-infrastructure

TSX5 Overview

The TSX5 system utilizes strain gauge technology applied to the surface of the intermediate shaft.

The shaft torque & propeller resistance lead to deformation of the surface of the strain gauge, altering its electrical resistance. This change in resistance allows for an accurate measurement of the strain that is present. The rotor board PCB, housed in the rotor ring, processes signals from the strain gauge and wirelessly transmits them to the main Input/Output (I/O cabinet) PCB. The rotor ring also protects the strain gauge from damage and contamination.

The TSX5 main I/O cabinet and power head are mounted on a stanchion adjacent to the shaft, then on a pedestal welded securely to the deck. The power head provides power to the rotor ring PCB by inducing a current in a copper wire wrapped around the rotor ring and connected to the PCB board.

TSX5 Shaft Power Meters can be easily fitted into a variety of shafts, ranging from 140mm up to 1000mm for larger vessels. A remote screen in the ECR displays torque and power values, along with shaft speed. Thrust measurement is available as an optional feature. 4-20mA and serial data outputs are available for connecting to a ShaPoLi system, the ship’s IAS or DCS, and for connecting to a Ship Performance Monitoring system.

Please refer to our latest TSX5 Shaft Power Meter brochure for more information.

ShaPoLi Overview

In June 2021, the International Maritime Organization (IMO) made changes to Marpol Annex VI: Regulations 23 & 25 that also included the introduction of the Energy Efficiency Existing Ship Index (EEXI) for existing vessels to reduce their carbon dioxide (CO2) emissions. All ships are required to comply with this regulation by December 31st, 2023.

As per the new law, each vessel must go through an EEXI-approved calculation to meet the required score. If the result is not satisfactory, then their engine's power must be decreased in order for it to comply with the regulatory requirement. A practical way of complying with EEXI rules is through Shaft Power Limitation (ShaPoLi). It works by connecting a shaft power meter to an alarm system on the bridge, which then notifies the Captain or Officer of Watch if set limits are exceeded.

To meet the requirements of the regulation, Trelleborg teamed up with EDIT Automation, Greece to develop a ShaPoLi system, which is both cost-effective and user-friendly. In 2022, after just five months of its development, EDIT ECO8 ShaPoLi was launched making an immediate impact in the market. The system is designed to integrate seamlessly with Trelleborg's TSX5 shaft power meter effortlessly and cost-effectively. It also provides a user-friendly solution that meets all compliance needs.

It is widely known for being the easiest and most cost-effective ShaPoLi system and consists of a TSX5 Shaft Power meter connected to an ECO8 ShaPoLi display computer located on the ship's bridge. The data, including live and stored information, alarm events, and instances of override usage, can then be accessed via a ship's computer or laptop.