DECK AND STEAM TURBINE GENERATOR FOR FPSO/FSO/FSRU/FLNG : Recommended Menu

[ Marine Turbine ]

[ SHIP & OCEAN ]

In addition to regular maintenance services, we offer a range of value-added services to improve customer satisfaction.

Regular inspections and preventive maintenance

LNG vessels today have a very long service life, and the boilers on-board are required to operate for around 20 to 40 years under difficult conditions. It is essential that preventive maintenance of the boiler is carried out to protect against aging deterioration. We have expert knowledge in preventive maintenance and will help you to ensure your vessel has a long, trouble-free service life, by replacing and servicing essential boiler components.

Scheduled maintenance for long-term operation

We will carry out general maintenance of boiler mechanical parts and testing of tubes (superheater tubes, bank tubes, and economizer tubes).

Scheduled maintenance for long-term operation (control and electrical systems)

We will carry out general maintenance of the control system while your ship is docked as a preventive measure to avoid major accidents.

Upgrade of control system to the latest version

We recommend that customers upgrade their control system to the latest version to improve system response in emergency situations, and to ensure that the automatic operation features of the control system function correctly in older boilers.

Training at MHI-MME

We hold a training workshop at MHI-MME Nagasaki to teach engineers how to troubleshoot boiler-related problems.

Operational data logging for troubleshooting

We will install a data logging function on the boiler control panel.

Change to easy-to-remove casing on superheater

We recommend customers change superheater casing to a type that can be separated into several pieces for easy removal.

For Turbines
To help manage fuel efficiency, it is vital to maintain a high turbine efficiency. We provide various solutions to keep your turbines in optimal condition and reduce your operating costs.

Regular inspections and preventive maintenance

As LNG vessels have a very long service life, the turbines on these vessels are required to operate for around 20 to 40 years under difficult conditions. It is essential that preventive maintenance of the turbine is carried out in order to protect against aging deterioration.
We have expert knowledge in preventive maintenance and will help you ensure that your vessel has a long, trouble-free service life, by replacing and servicing essential turbine components.

Measures to prevent stud bolts from seizing

The nuts and stud bolts used in high temperature areas are made of a high-strength material to stop them overheating, but this material can sometimes cause the bolts to seize.
We recommend replacing existing nuts and bolts with new improved ones made of a special material with an aluminium coating to prevent seizing.

Upgrade of turbine remote control system

We strongly recommend renewing the entire remote control system in vessels that have been in service for 15 years or more. The turbine remote control system is an electronic device that includes a computer and a power supply system. According to Japan Electrical Manufacturers' Association (JEMA) standards, the lifespan of the system is 10 years.

Main turbine dock maintenance

We can provide a main turbine recommended dock maintenance parts list that covers the docking schedule of each type of ship for the next 20 years. The list helps you to stay on top of what maintenance is required when your ship is docked.

Change of packing ring to all-in-one type (information only)

We plan to supply a solid-type fin for all new orders.
The HP/LP gland packing ring and diaphragm packing are fabricated by embedding fins in the groove of the ring. Since the fins and the ring are made of different materials, their thermal expansion characteristics differ, causing the fins to contract and fall off the groove in some cases.

Preparation of spare parts to enable immediate repair of cracks on main valves

In very rare cases, cracks have been found in the valve stellite during scheduled maintenance works while ships are docked. These cracks have occurred as a result of low cycle fatigue, caused by repeatedly operating and stopping the engine. We have prepared valve bodies, seats, spindles, bushes and other essential parts, to enable us to promptly repair valves found to be cracked during dock maintenance work.

Inspection of inside of main condenser water chamber

We can dispatch expert technicians to carry out a full inspection of the tube sheet surface, inside the tube, and the rubber lining. Normally maintenance work such as cleaning the inside of the water chamber is carried out as part of routine dock maintenance, but there is concern that a full inspection of inner parts such as inside the cooling tube, the sheet surface, and the inner fitted rubber lining might not be being carried out to a high standard.

Use of hydraulic torque wrench

Usually, large diameter bolts on the main turbine are tightened by hand using a slug wrench. We recommend using a hydraulic torque wrench when tightening and loosing bolts on the main turbine. We stock hydraulic torque wrenches in Dubai and Singapore docks that may be lent to customers if required.

Upgrading to a higher performance bolt heater

Hydraulically tightening unheated bolts on a cold turbine will create too large a strain on the threads and from a structural point of view is not a feasible method. For safety purposes, we recommend upgrading to an HF induction bolt heater. The tightening force on HP turbine casing bolts (high-pressure, high temperature regions) is specified as 30 kg/mm2 during operation.