On ocean-going freighters, the following types of ventilation ducts may work well:

1. Galvanized steel ventilation pipe ** : with high strength and corrosion resistance, it can adapt to the complex environment at sea and ensure stable ventilation performance.

2. Stainless steel ventilation pipe ** : strong corrosion resistance, durable, can maintain good condition for a long time.

3. FRP ventilation pipe ** : relatively light weight, but also has a certain corrosion resistance and strength.

When installing, you also need to consider the following points:

- Reasonable layout design to ensure ventilation to all key areas, such as cargo hold, engine room, etc.

- Sufficient pipe diameter and ventilation volume to meet the ventilation needs of different areas.

- The installation is well sealed to avoid air leakage affecting the ventilation effect.

- Consider the ability to withstand wind and vibration to ensure the stability of the pipeline during the voyage.

For example, in the cargo hold, the direction of the galvanized steel ventilation pipe can be reasonably planned according to the spatial layout to ensure that the air can be evenly distributed; Stainless steel ventilation ducts are used in important areas such as the engine room to cope with the erosion of high temperature and high humidity environment; Some areas that are more sensitive to weight can use fiberglass ventilation ducts to reduce the overall weight. At the same time, the connection parts of the pipeline should be sealed to prevent the occurrence of sea wind backflooding, etc., and the design should fully take into account the possible impact of the shaking of the ship during navigation on the pipeline, and take appropriate reinforcement measures.

The following are some requirements for the installation location of ventilation ducts on ocean-going freighters:

1. Cargo hold area:

- Should be reasonably distributed on the top and sides of the cargo hold to ensure adequate air circulation of the cargo to prevent moisture and mildew.

- Avoid the stacking position of the goods to avoid affecting the loading and unloading of goods and the ventilation effect.

2. Cabin area:

- Close to the main machinery to take away heat and exhaust gases, ensuring a good working environment in the cabin.

- Pay attention to avoid high temperature and high vibration parts to prevent pipeline damage.

3. Crew living area:

- Ensure that every room and public area has good ventilation to improve living comfort.

- Avoid installation near noisy areas, so as not to affect crew rest.

4. Kitchen and dining area:

- Timely discharge of fumes and odors to keep the air fresh.

- Installation location should be easy to clean and maintain.

5. Other areas:

- Passageways and corridors should also be properly arranged to ensure smooth air circulation.

- For some special areas, such as fuel storage areas, to be installed in accordance with the relevant safety regulations.

6. Also pay attention to when installing:

- Consider the structure and layout of the vessel to avoid conflicts with other equipment and systems.

- To comply with the relevant safety codes and standards to ensure the safe operation of the ship.

- Reserve some repair and maintenance space to facilitate future inspection and repair of ventilation ducts.

For example, ventilation ducts are evenly distributed at the top of the cargo hold to ensure that all parts of the cargo are covered; In the engine room, ventilation pipes with large diameter are installed near the main engine and other large equipment to meet the heat dissipation requirements. The ventilation pipe of the crew bedroom should be installed in a suitable position to ensure air circulation without noise interference; The ventilation pipe of the kitchen should be effectively connected with the equipment such as the range hood to quickly discharge the oil smoke. At the same time, carefully review the ship drawings during installation to ensure that the ventilation duct and other systems do not interfere with each other, and operate in strict accordance with safety standards to ensure the robustness and safety of the installation.