Marine Manhole Cover

About product

Marine manhole covers are essential sealing devices for ship compartments, primarily used for inspection, maintenance, and ventilation access to various tanks and spaces. Their design must meet watertight, airtight, corrosion-resistant, and quick-opening/closing requirements to ensure the vessel’s safety and reliable operation under complex sea conditions.

  • Carbon steel: Cost-effective and high in strength, suitable for general compartments where corrosion protection is not critical. Usually requires additional anti-corrosion treatment such as hot-spray zinc or epoxy coating.
  • 304 stainless steel: Offers better corrosion resistance than carbon steel, suitable for fresh water tanks, engine rooms, and accommodation spaces with high humidity but less severe corrosion environments.
  • 316 stainless steel: Contains molybdenum, providing excellent resistance to pitting and seawater corrosion. Ideal for ballast tanks, fuel oil tanks, and exposed decks where long-term contact with seawater occurs.

Product Detail

Marine Manhole Covers & Lids for Sale

Our manhole covers are suitable for all types of steel vessels, providing watertightness and oiltightness, effectively preventing seawater, oil, or other liquids from entering or leaking, thereby ensuring compartment safety and vessel stability. Common types include standard manholes, oval manholes, and rectangular manholes, which can be customized according to installation location, intended use, and owner requirements. The design and manufacturing strictly comply with international classification society standards (CCS, LR, DNV, ABS, etc.).

Marine Manhole Cover Product Types

Raised Manhole Covers

  • Type A: Welded structure with a coaming 100mm above the deck surface, dimensions ranging from 450×350mm to 600×450mm. Suitable for engine rooms, pump rooms, and other areas prone to water accumulation, effectively preventing liquid ingress.

  • Type B: Oval design with a 20mm thick seat ring, suitable for decks, inner bottom plates, platforms, and bulkheads. Compact structure with wide applicability.

  • Type C: Circular structure with a through-hole diameter of Φ450mm / Φ600mm, commonly used for platforms, cabinets, and inspection openings, convenient for maintenance and ventilation.

Flush-Mounted Manhole Covers

  • Type D: Cover thickness 10–12mm, dimensions 530×430mm to 630×480mm, suitable for flat areas such as cargo hold bottoms. Easy to install with stable sealing performance.

  • Type E: Cover thickness 14–18mm, providing higher pressure resistance, ideal for high-pressure environments or areas requiring greater structural strength.

Type

Name

Clear Size

A

Long oval manhole cover with coaming

450*350

600*400

800*600

B1

Long oval flush-mounted manhole cover

450*350

600*400

800*600

B2

Elliptical flush-mounted manhole cover

800*400

C1

Long oval recessed manhole cover with hood

450*350

600*400

800*600

C2

Elliptical recessed manhole cover with hood

800*400

D1

Long oval recessed manhole cover without hood

450*350

600*400

800*600

D2

Elliptical recessed manhole cover without hood

800*400

Marine Manhole Cover & Lid Diagram

A-shaped Manhole Cover Diamension

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

M20

16

23.2

6

30.8

8

36.9

10

45.8

600*400

600

620

720

400

420

520

6

20

48.8

8

59.2

10

69.3

12

79.6

800*600

800

820

920

600

620

720

8

26

52.4

10

65.8

12

78.2

14

90.2

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Know Who We Are

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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