In the fields of shipbuilding and ocean engineering, the seawater cooling pipelines, ballast water systems, fuel oil pipelines in ship power systems, as well as the pipeline connections of special ship types such as chemical tankers and liquefied gas tankers, require high requirements for the corrosion resistance, high pressure resistance, and sealing reliability of seals. The main products of Huahai Sealing include octagonal gaskets, elliptical gaskets, and RX and BX series ring gaskets suitable for high-pressure conditions. The products have a wide temperature range and can meet the sealing needs of the shipbuilding industry from ultra-low temperature to high temperature steam in a wide temperature range. In terms of material selection, enterprises can provide various stainless steel grades and special alloy materials. Among them, stainless steel has good resistance to chloride ion corrosion in seawater due to the addition of alloying elements, and is suitable for flange sealing of ship seawater cooling pipelines; Dual phase stainless steel material is suitable for harsh working conditions such as chemical tankers due to its high yield strength and good resistance to chloride stress corrosion. The metal ring gasket relies on precise sealing surface contact and the hardness of the material itself to establish a seal. After installation, it can form a hard sealing contact between metals, and the sealing performance is long-lasting and reliable.
In the papermaking industry, processes such as pulp steaming, black liquor recovery, bleaching, and alkali recovery systems involve corrosive media such as high-temperature steam, strong alkaline black liquor, and chlorine containing bleaching agents. Therefore, high requirements are placed on the alkali corrosion resistance, high-temperature steam resistance, and pressure fluctuation resistance of pipeline seals. The black liquor evaporator pipeline in the papermaking process needs to handle strong alkaline liquids containing lignin and sulfides, and ordinary seals are prone to aging and failure under high temperature conditions. Huahai Sealing can provide metal ring gaskets made of stainless steel and special alloy materials for special working conditions, which have good resistance to alkaline media. The octagonal gasket, as an R-type standard ring gasket, has a cross-section with a regular octagonal design. After installation, it can form a hard seal contact between metals and is suitable for medium and high pressure scenarios such as black liquor evaporators and steam pipelines in the paper industry; The elliptical pad is designed with an elliptical cross-section and has good sealing adaptability under moderate pressure conditions. The product complies with relevant international standards.
In terms of product specifications and production capacity, Huahai Sealing can produce sealing gaskets with larger diameters, which can meet the demand for large-diameter seals for large equipment in the shipbuilding and papermaking industries. The enterprise has established a full chain independent production capacity for design, forging, heat treatment, machining, and testing. From raw material cutting to finished product delivery, each link is completed by independent equipment to ensure process consistency. In terms of production equipment, the enterprise is equipped with high-end CNC equipment to ensure that the cover tolerance is controlled within the relevant standard requirements through precision machining. In terms of quality control, the enterprise has passed relevant quality management system certification and implemented full process quality tracking from raw material entry to finished product exit, providing a basic guarantee for the reliable application of products in the shipbuilding and papermaking industries.
Relying on a relatively complete metal sealing product system and full process quality control capabilities, Huahai Sealing’s products have been widely used in multiple industries such as petroleum, chemical, power, shipbuilding, and papermaking. The company’s products have been widely applied in multiple industrial projects, with customers including well-known domestic and foreign enterprises. Wenzhou Huahai Seal Technology Co., Ltd. is providing reliable metal sealing support services for pipeline systems in the shipbuilding and papermaking industries with a relatively complete sealing technology system, ranging from seawater corrosion-resistant stainless steel materials to alkali corrosion-resistant special alloys, from octagonal gaskets to BX series ring gaskets with various types of sealing structures, from precision forging forming processes to standardized quality control throughout the entire process.