Bronze Butterfly Valves Special for Ship Systems: Selection of DN80 - DN300 Caliber And Adaptation Schemes To MARPOL Standards

In ship systems, BRONZE BUTTERFLY VALVES play an indispensable role, especially those with a caliber in the range of DN80 - DN300. Understanding the key points for their selection and the adaptation schemes to MARPOL standards is crucial for ensuring the normal operation of ship systems and meeting environmental protection requirements. The following is a detailed introduction for you.

I. KEY POINTS FOR SELECTING BRONZE BUTTERFLY VALVES WITH A CALIBER OF DN80 - DN300

1. Consideration of Flow Requirements

Different ship systems have different requirements for the flow rate of media. Take the ship's cooling system as an example. It requires a large amount of cooling water to circulate to maintain the normal heat dissipation of equipment. At this time, it is often necessary to choose BRONZE BUTTERFLY VALVES with a larger caliber, such as those with specifications of DN200 - DN300, so as to ensure that the cooling water can pass smoothly and meet the flow requirements for heat dissipation. For the branch pipelines for fuel oil transportation, the flow requirement is relatively small, and BRONZE BUTTERFLY VALVES with a caliber of DN80 - DN100 usually can meet the usage requirements and ensure the stable transportation of fuel oil.

The following table shows the approximate appropriate caliber ranges corresponding to different ship systems:

2. Pressure Withstanding Capacity

When the ship is in operation, there are differences in the pressure of the media in various systems. For example, in a hydraulic system, the internal pressure is usually relatively high. Therefore, when selecting bronze butterfly valves, it is necessary to choose products with high pressure-bearing capacity to ensure that the valves will not leak or be damaged in a high-pressure environment, so as to ensure the normal operation of the system. In contrast, the pressure of the domestic water system is relatively low, and the requirements for the pressure-bearing capacity of the valves are not so strict.

3. Adaptation to Medium Characteristics

Ships transport a variety of different media, such as fresh water, seawater, fuel oil and other kinds of oils. If the medium is seawater, in view of its corrosiveness, the bronze butterfly valve needs to have good seawater corrosion resistance. It is more appropriate to choose materials with good corrosion resistance, such as nickel-aluminum bronze, which can effectively resist the erosion of salts in seawater on the valve. If the transported medium is fuel oil, it is necessary to focus on the chemical compatibility between the valve material and the fuel oil to prevent leakage problems caused by corrosion by the fuel oil and ensure the safety of transportation.

II. MARPOL STANDARDS AND ADAPTATION SCHEMES

MARPOL is the International Convention for the Prevention of Pollution from Ships. The bronze butterfly valves used on ships must comply with the relevant requirements of this standard.

1. Pollution Prevention

In pipeline systems that may come into contact with oily sewage, chemical sewage, etc., bronze butterfly valves must strictly prevent these pollutants from leaking into the ocean. According to MARPOL standards, the sealing performance of the valves must meet a relatively high standard, and the leakage rate at the sealing position must be controlled at a very low level. Different media have their own specific limited leakage volume values. For example, a certain type of oily sewage requires that the leakage volume per hour shall not exceed a specific number of milliliters, etc., so as to avoid polluting the marine environment.

2. Environmental Protection of Materials

The MARPOL standards also attach great importance to the environmental protection characteristics of valve materials and require that they should not contain heavy metal components harmful to marine organisms. During the production process of BRONZE BUTTERFLY VALVES, it is necessary to strictly control the selection of raw materials and conduct component tests on bronze materials to ensure that the selected materials meet environmental protection requirements and fundamentally prevent adverse effects on the marine ecosystem caused by valve material problems.

The following table presents the adaptation requirements of bronze butterfly valves in different aspects according to MARPOL standards:

In conclusion, when selecting BRONZE BUTTERFLY VALVES with a caliber of DN80 - DN300 for ship systems, it is necessary to comprehensively consider the key points for selection, such as flow requirements, pressure withstanding capacity, and medium characteristics, and at the same time ensure that they can be well adapted to MARPOL standards. Only in this way can the ship systems operate stably and the marine environment be effectively protected.