Marine Aluminum Manhole Cover

About product

Marine aluminum manhole cover is a commonly used key sealing device in ship cabins, manufactured from high-strength aluminum alloy. It is mainly applied for sealing inspection openings on decks or bulkheads, featuring advantages such as lightweight design, corrosion resistance, and easy operation. Compared with traditional steel manhole covers, aluminum products significantly reduce overall weight while ensuring strength and sealing performance, thereby improving vessel speed and fuel efficiency.

  • Reliable watertightness: Tested under ≥2 kg/cm² water pressure to ensure sealing performance even in harsh sea conditions.
  • Flexible installation: Available in round, elongated, or oval shapes customized according to deck, bulkhead, and installation space requirements.
  • Easy maintenance: Lightweight and easy to assemble/disassemble, with rubber gaskets that can be quickly replaced.
  • Adequate strength: While reducing weight, it still provides sufficient strength to meet inspection and pressure-bearing requirements.

Product Detail

Marine Aluminum Manhole Cover

Our marine aluminum manhole covers are essential sealing devices installed at the access points of ship compartments such as engine rooms, cargo holds, ballast tanks, fresh water tanks, and fuel oil tanks. They are designed to close manholes securely and ensure the watertightness and airtightness of the compartment.

Manufactured from high-quality aluminum alloys (commonly 5083 and 6061), these covers offer the advantages of lightweight construction, corrosion resistance, and high strength. They can be fixed either by bolts or by welding, meeting the needs of routine inspection, ventilation, and emergency escape on board.

  • Cover Plate: Made with integrated casting or welded construction. The surface can be anodized or treated with anti-corrosion coatings, providing both mechanical strength and excellent resistance to seawater corrosion.

  • Coaming/Seat Ring: Fully welded to the deck or bulkhead, with welds subject to non-destructive testing to guarantee overall watertight integrity and structural reliability.

  • EPDM Rubber Gasket: Offers outstanding resistance to seawater, oil, aging, and extreme temperatures, ensuring long-term watertight and airtight performance.

  • Opening/Closing Mechanism: Typically secured by handwheels or bolts. Some models are equipped with quick-action closing devices, enabling convenient operation and improved efficiency during inspection and maintenance.

A Type Aluminum Manhole Cover

Type

Clear Size

L1

L2

L3

B1

B2

B3

S

Bolt

Weight KG

mm

dia

qty

A

450*350

450

470

570

350

370

470

4

M24

20

7.3

6

9.7

8

12.2

10

14.6

500*400

500

520

620

400

420

520

6

24

11.3

8

13.8

10

16.6

12

19.4

B Type Aluminum Manhole Cover

Type

Clear Size

L1

L2

L3

B1

B2

B3

S

Bolt

Weight KG

mm

dia

qty

B

450*350

450

470

570

350

370

470

4

M24

20

9.5

6

10.8

8

12.0

10

13.2

500*400

500

520

620

400

420

520

6

24

12.3

8

13.7

10

15.2

12

16.7

C Type Aluminum Manhole Cover

Type

Clear Size

L1

L2

L3

B1

B2

B3

S

Bolt

Weight KG

mm

dia

qty

C

450*350

450

560

600

350

460

470

6

M24

20

15.8

556

456

8

17.8

552

452

10

21.6

500*400

500

606

650

400

506

520

8

24

20.6

602

502

10

25.1

598

498

12

29.6

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About our company

Zava Marine Corporation is a leading supplier of marine parts and components. With a strong focus on quality and customer satisfaction, we specialize in providing a comprehensive range of high-quality marine equipment and accessories. Our products include deck equipment, ship accessories, and various other essential components needed for smooth maritime operations.

With a global presence, we serve a diverse customer base, including shipbuilders, shipowners, offshore operators, and marine equipment distributors. We are committed to providing exceptional service and tailored solutions to meet our customers’ unique needs.

FAQ

Zava Marine offers a comprehensive range of certifications for marine parts in accordance with international standards and regulations. These certifications include those provided by renowned marine classification societies such as Lloyd’s Register (LR), Bureau Veritas (BV), China Classification Society (CCS), Registro Italiano Navale (RINA), American Bureau of Shipping (ABS), Nippon Kaiji Kyokai (NK), and Det Norske Veritas – Germanischer Lloyd (DNV-GL). By collaborating with these esteemed societies, Zava Marine ensures that our certified marine parts meet the highest standards of safety, quality, and performance, instilling confidence in our reliability and compliance within the maritime industry.

The warranty provided by Zava Marine covers defects in materials and workmanship for a period of two years from the date of purchase. During this warranty period, if any marine parts purchased from Zava Marine exhibit issues or failures resulting from manufacturing defects or faulty materials, Zava Marine will take responsibility for repair or replacement of the affected parts. 

Zava Marine has recently opened new molds for European and North American clients, utilizing materials such as metal, ABS, PVC, and more. These successful mold opening projects allow us to provide customized marine parts and components that meet the specific requirements of our clients in these regions.

Typically, Zava Marine can ship samples within 7 days once the product drawing has been mutually confirmed by both parties. This efficient process ensures that customers can receive samples promptly, allowing them to assess the quality and suitability of the products.

Zava Marine frequently utilizes a wide range of materials in our projects. These materials include aluminum, stainless steel, carbon steel, copper, plastics, titanium, and PEEK (Polyether Ether Ketone). Each material offers unique properties and characteristics suitable for various marine applications. 

Yes, we provide customization services for marine parts. We understand that every project and application may have unique requirements, and we are committed to delivering tailored solutions. By collaborating closely with our clients, we can adapt our products to specific specifications, ensuring optimal fit, performance, and compatibility. Whether it’s modifying existing designs or creating entirely new parts, our customization services cater to the diverse needs of the maritime industry.

Absolutely! We offer product design and development services to support our clients’ needs. Our experienced team of engineers and designers can collaborate with clients from concept development to final product realization. By leveraging our expertise in marine engineering and design, we can provide valuable insights and innovative solutions. Whether it’s optimizing existing designs or creating entirely new products, we are equipped to assist clients in bringing their ideas to life efficiently and effectively.

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