20/05/2024

Work of an ETO on ships with cranes. What most often breaks on cargo cranes?

Greetings! In this article, we will look at general issues related to the work of an ETO on ships with cranes.

Work of an ETO on ships with cranes. What most often fails on cargo cranes?

Recently, the number of ships with cargo cranes in the world merchant fleet has been increasing, so this article will be of interest primarily to ETOs who are just starting to work on such vessels.

A cargo ship performs, among other things, two important tasks - unloading, loading and transporting cargo. All these tasks involve an ETO, who is assigned more of a repair role than an operation one.

Temperature controller. Replacing and adjusting the temperature controller on a cargo crane

Greetings! In this article we will change the temperature controller of a cargo crane. It has failed and for this reason the crane hydraulic protection system based on oil temperature does not work.

Temperature controller. Replacing and adjusting the temperature controller on a cargo crane

The temperature controller (PID controller) on the crane, together with the PT100 RTD (Resistance Temperature Detector) sensor, are key elements in protecting the crane hydraulics from oil overheating. 

16/05/2024

The crane jib is luffing down under its own weight. Troubleshooting

Greetings! Another problem occurred on the cargo crane; its jib is slowly going down without affecting the manipulator (joystick). More precisely, the crane boom is lowered down and stopped, but by inertia it continues to go down without operator action under its own weight.

The crane jib is luffing down under its own weight. Troubleshooting

This problem can lead to significant damage and therefore requires immediate elimination. In the previous article, we looked at a situation where the crane hook was slow to move (abnormal speed of the crane) when operating on the corresponding joystick. 

15/05/2024

The cargo crane does not slew. Troubleshooting

Greetings! Today we have a problem with the cargo crane, it won’t slew. In this case, there are no signals or alarms, the crane starts up, executes the commands “jib up, hook up” and “jib down, hook down,” but does not slew in any direction.

The cargo crane does not slew. Troubleshooting

According to the instructions for the crane, you need to check the following circuit: Joystick - PLC - relay - Proportional Driver Unit - Proportional Valve.

Let's check the entire electrical circuit and figure out the reason for the improper operation of the cargo crane.

The crane hook goes up slowly. The cargo crane is not working. Troubleshooting

Greetings! The hook of the cargo crane goes up very slowly. There is no accompanying information or prompts from the automation.

Crane control panel

In this article, let's figure out what this problem is and how to fix it. First of all, you need to understand that we are only interested in the section of the circuit that is responsible for the “hoist up” hook command (not the jib). 

Pressure switch. The fuel pressure switch on the boiler has failed. What is an abnormal fire?

Greetings! Today our fuel pressure sensor on the boiler failed. We found out about this as a result of the malfunction of the boiler and the alarm “Abnormal fire” on the panel. This problem is quite critical and requires an immediate solution.

Pressure switch. The fuel pressure switch on the boiler has failed. What is an abnormal fire?

According to the instructions, the pressure in the line to the fuel spray nozzles should be about 20 kg, the pressure switch setting should be about 14 kg (low pressure protection).

Below I propose to figure out what this problem is and what it can lead to in the future.

14/05/2024

Abnormal Fire. The boiler does not start. Troubleshooting

Greetings! Today our boiler does not start, there is an “Abnormal Fire” signal on the panel, and a “Boiler Total Alarm” on the alarm monitoring system in the ECR. The main switchboard has low insulation 440V, but no alarm.

Abnormal Fire on the boiler
Abnormal Fire on the boiler

There can be many reasons for this problem; in this article we will look at some of them. And we will analyze our case in detail.

Phase fail. The turning gear and the LO autofilter of the main engine do not start

Greetings! Today we have a problem with the turning gear and the LO autofilter of the main engine. During the preparation of the main engine, alarms were sent to the alarm monitoring system in the ECR indicating that some kind of problem had occurred with these mechanisms.

Phase fail. The turning gear and the LO autofilter of the main engine do not start

It is necessary to pay attention to the fact that problems with starters or motors occurred at the same time and perhaps they have something in common. On a ship, these systems are not connected to each other in any way.

09/05/2024

The 220V emergency equipment transformer was tripped. Actions of the ETO on the vessel

Greetings! Today we have switched off all 220V emergency equipment on the vessel, including 220V emergency lighting. In this article we will analyze the cause of this breakdown, as well as ways to find and fix the problem.

The 220V emergency equipment transformer was tripped. Actions of the ETO on the vessel
Service emergency transformers 440 / 220 V

In this situation, it is necessary to immediately check the emergency distribution board, which contains all the automatic switches (breakers) for emergency power sources on the ship.

08/05/2024

The autotransformer was flooded with sea water. Emergency fire pump problem

Today we got low insulation of 440V on the main switchboard megohmmeter when starting the emergency fire pump. Checking the power part of the circuit showed an insulation resistance relative to the electric motor housing of 0 MOhm. Has the motor burned out or is there a chance to restore normal operation of the mechanism?

The autotransformer was flooded with sea water. Emergency fire pump problem

Checking the power part of the circuit (main contactor and autotransformer) with a portable megohmmeter showed 0 MOhm. Have to climb into the pump shaft and measure the insulation resistance of the electric motor at the terminal box with disconnecting of the power cable.