Where Are The Steering Gear And Steering Device Generally Installed? Detailed Explanation Of The Layout Of The Stern Engine Room

Where are the steering gears and steering devices usually installed? This is part of the engine room layout and purchasing decision-making guide. Are the punctuation marks used correctly? This is another question.

Rear description: The steering gear and steering gear are usually installed in the stern engine room or steering gear room. This article is from the perspective of procurement decision-making to analyze the installation orientation, spatial layout, selection comparison and common misunderstandings, thereby assisting engineering and procurement personnel to make reliable judgments.

Quick Answer

The steering gear and steering device are generally installed in the steering gear compartment of the ship. This cabin is often located in the stern area, close to the propeller. The exact location depends on the type of ship, the layout of the power system and the type of steering gear. Common installation solutions include: directly installed above the rudder stock, remotely arranged with the help of a connecting rod system, or integrated into a pod-type thruster. Choosing the correct installation location will directly affect the efficiency of steering, the convenience of maintenance and the safety of the system.

The reliability of the steering gear system is not only a technical matter for ship operators, but also a dual consideration of safety and cost; every delay in the steering command is likely to mean a momentary deviation when berthing, or an emergency maneuver in the channel; however, when selecting steering gears and steering devices, many purchasing decision makers often focus on torque parameters or brand prices, but ignore the most basic and critical part: the installation location.

When the installation location is inappropriate, the transmission efficiency will be reduced, the maintenance channel will be blocked, and even system resonance will occur. A more hidden risk is that incorrect layout will make daily inspections difficult, thereby masking early failure signals such as lubricant leakage and seal wear. These problems that could have been avoided will eventually turn into unplanned outages and maintenance bills.

In the following content, we will systematically dismantle the typical installation locations ofservos and steering devices, analyze the impact of different layouts on procurement, installation, and long-term operation, and then provide judgment standards that can be directly used by engineering and procurement personnel.

1. Why is the installation location more important than the torque rating? There is a situation where the impact of the installation location on related things exceeds the corresponding impact of the torque rating.

2. For the steering gear system, the standard installation location is how the system is constituted and how it exists in the space.

3. Key factors that dominate positioning decisions, key factors that influence positioning decisions, and key factors that play a role in positioning decisions.

4. What should buyers check, what should be checked, and what should be checked before finalizing the layout.

5. Common installation errors and their consequences, common installation errors and their consequences, common installation errors and their consequences.

It is necessary to understand a core logic before starting to discuss the specific location: the installation location determines the actual usable performance of the system. For a steering gear with sufficient nominal torque, if the transmission path is too long due to the installation position, or the angle deviation is too large due to the installation position, the actual torque output to the rudder blades may be extremely reduced.

From an engineering perspective, the installation location directly affects three key dimensions:

In terms of transmission efficiency, the length of the pipeline between the hydraulic steering gear and the steering device and the number of elbows play a role in determining the size of the pressure loss. Every time an elbow is added or the pipeline is extended by one meter, the system response time will increase accordingly.

Installation in a narrow area that is difficult to access easily, or in a location with high vibration, will most likely significantly increase the difficulty of daily inspection and component replacement. Many shipowners did not realize until the mid-term period of operation that some seals had to be replaced by removing peripheral equipment. This situation directly led to a sharp increase in maintenance-related costs.

Safety redundancy, which has dual sets of steering gear systems, and whether the installation space is sufficient, determines whether the system can quickly perform switching actions in the event of a failure, and many other aspects. Generally speaking, regulations require that dual systems be independent of each other and not interfere with each other. This requirement must be properly and thoughtfully met in some way during the planning and conception of the installation location.

Therefore, when the engineering team or purchasing personnel encounter the supplier's proposal, they do not just compare the torque values, but also evaluate whether the recommended installation layout is reasonable.

According to international classification society regulations and industry practices, the installation position of the steering gear and the installation position of the steering device are mainly classified into the following categories:

This is the most common installation method. The steering gear compartment is usually located in the stern area of the ship, and is arranged directly above the rudder stock, or next to the rudder stock. This cabin is an independent fire-proof cabin, and it is separated from the engine room by a watertight door or bulkhead.

Applicable scenarios: large and medium-sized commercial ships, passenger ships, and engineering ships.

Advantages: shortest transmission path, fastest response; convenient for centralized monitoring and maintenance.

Note: The size of the cabin must meet the maintenance space requirements, and hoisting channels must be reserved.

In some small ships or ships with limited space, the rudder device may be installed at the stern of the engine room and connected to the rudder stock through a connecting rod or chain system.

Applicable scenarios: small tugs, fishing boats, and inland river vessels.

Advantages: existing structural space can be utilized and the construction of independent cabins can be reduced.

Special attention should be paid to the fact that the number of transmission links has increased, so the wear of the connecting parts must be checked regularly, and the pipelines must be arranged to avoid high temperature environments and sources of vibration.

In electric-propulsion ships or special ships, the steering gear system can be integrated into the pod together with the propulsion motor, which is called a pod-type thruster. At this time, the rudder device and thruster relied on integrated design, and its installation position was determined based on the layout of the pod.

Applicable scenarios: icebreakers, dynamic positioning ships, luxury cruise ships.

Advantages: excellent maneuverability, 360-degree steering; compact structure.

Note: The system is complex and requires higher sealing and cooling requirements; maintenance requires docking.

For very large ships or special layout requirements, the hydraulic power unit can be placed at a specific position in the engine room far away from the rudder stock, and the rudder steering device can be driven by a long hydraulic pipeline.

Applicable scenarios: VLCC, large bulk carriers.

Advantages: The power unit can be placed in a low-vibration area to extend the life of the equipment.

Note: The pipeline pressure drop must be accurately calculated; an accumulator needs to be added to compensate for the response delay.

When choosing an installation location, the following factors need to be evaluated individually:

Before purchasing, it is recommended to make a checklist of the above factors and confirm them one by one with the supplier. If the steering gear selection is not carried out through location evaluation, the responsibility for key decisions is actually transferred to the installation site.

Before determining the installation location plan, procurement and engineering personnel should complete the following key checks:

1. Whether the access door opening space can be met requires confirmation of the cabin dimensions. Many problems arose after the equipment was delivered. It was found that the installation space was insufficient, resulting in the access door unable to be opened smoothly.

2. Verify the compatibility of the hydraulic pipeline interface with the existing piping system. Different brands of hydraulic steering device joint specifications have different possibilities. Confirmation in advance can avoid on-site modifications.

3. Evaluate the separation layout of cables and hydraulic pipelines. The risk of electromagnetic interference and leakage of oil pipes must be reduced through physical isolation.

4. Ask the supplier for an installation sample drawing. This is more reliable than a two-dimensional layout drawing. It can intuitively reflect the conflicts that exist during the actual installation process.

5. Verify an independent approach to redundant systems. In dual systems, the pipes and cables must pass through different paths. Otherwise, the risk of a single failure cannot be eliminated.

After completing all the above-mentioned checks, you can then proceed to the business negotiation stage, which can significantly reduce the cost of later changes.

According to industry experience, the following three types of installation errors are the most common and have serious consequences:

Mistake 1: Ignoring the impact of pipeline length on response time

In the pursuit of saving engine room space, the hydraulic power unit is sometimes placed far away from the rudder stock. If the pipeline pressure drop calculation is not done, it may cause a delay in the execution of the steering command. In an emergency avoidance situation, every second of delay may turn into a collision risk.

Mistake 2: Not reserving enough space for maintenance

In some renovation projects, in order to utilize the existing space, the steering device will be placed close to the bulkhead. Such a situation meant that when the seals were replaced half a year later, the three surrounding equipment had to be dismantled before they could get close. Maintenance hours have changed from 4 hours to 24 hours, which directly increases the whole life cycle cost.

Mistake 3: Dual systems share support structures

In some cost-control-oriented design situations, the bases of both systems use the same steel structure. Once fatigue cracks occur in this structure, the risk of simultaneous failure of both systems will become a reality. Such a design does not comply with the redundancy principle, but it still often happens in small and medium-sized shipyards.

It can work, but the prerequisite is that the base must undergo structural strength calculations, and there is a clear physical separation between the two systems. If the base is shared, it should be ensured that the vibration generated by one system will not interfere with the normal operation of the other system.

This is not necessarily the case. For ships whose length is less than a certain standard, regulations generally allow the steering gear to be installed in the engine room, but fire protection and isolation requirements must be met. For specific conditions, please consult the Classification Society Plan Approval Center.

What is usually required is an A-60 fire-resistant division, which means it must be able to withstand a standard fire test for 60 minutes. Watertight doors above the bulkhead should also have the same fire resistance.

can. Longer pipes indicate more joints and elbows, each of which is a potential leak. In addition, the temperature of hydraulic oil in long pipelines increases more significantly, which may accelerate the aging of seals.

Not at all. The installation height must be determined to ensure that the rudder stock connection angle is in the best state. If it is too high, the center of gravity will increase, which will affect the stability of the ship; if it is too low, it may be flooded, so sealing protection needs to be added.

We provide strong suggestions. Three-dimensional models can help suppliers discover interference problems at an early stage, so as to avoid the situation that installation cannot be carried out at all after the goods arrive. Many suppliers can use the models to provide detailed installation plans.

Under normal circumstances, it is required that after a single set fails, the switching action must be completed within 28 seconds to restore the working state. The installation position needs to ensure that the switching valve group is relatively easy to access, so as to facilitate manual operation.

The installation position of the steering gear and steering device is not an isolated parameter that can be determined based on a layout diagram. It has an impact on the entire cycle from the beginning of procurement to the end of scrapping: it determines whether the installation cycle is long or short, has an impact on whether daily inspections can be carried out smoothly, and is also related to the bill amount corresponding to each unplanned maintenance.

Choosing a supplier who can provide an evaluation of the installation plan will have greater long-term value than just comparing torque price. At the stage of project confirmation, it is proposed to include the installation location checklist, pipeline pressure drop calculation report and redundant system independence certificate as technical accessories in the contract.

If your team is conducting a steering gear selection assessment for a new shipbuilding or retrofit project,kpower servocan provide engineering support that includes an assessment of the installation location. Welcome to submit your cabin layout drawing or technical parameters, and our team will help complete the entire process consultation from selection to installation.

Contactkpower servo→ Submit technical parameters or make an appointment for engineering evaluation