Marine-Grade Manhole Covers
Our marine manhole covers are engineered to provide secure, sealed access points for ship maintenance tasks while ensuring complete watertight or oil-tight protection in harsh ocean environments. Designed to meet stringent maritime safety standards, these essential ship components are available in both oblong and round shapes, catering to diverse applications on oil tanks, water tanks, and other storage compartments across various vessels.
Key Features & Benefits for Enhanced Ship Performance:
✔ Multiple Seal Options: Choose from watertight (seawater-resistant neoprene rubber) or oil-tight (oil-resistant butadiene rubber) gaskets for tailored protection against leaks and spills.
✔ Robust Construction: Crafted from high-quality materials including hot-rolled carbon steel, AL6063 aluminum, and stainless steel for exceptional strength and durability.
✔ Corrosion-Resistant Fasteners: Galvanized carbon steel or stainless steel bolts, nuts, and washers ensure long-lasting performance in saltwater environments.
✔ Flame-Retardant Seals: Fire-resistant rubber gaskets meet safety requirements, providing an added layer of protection against potential fires onboard.
✔ Ergonomic Handles: Stainless steel (SUS304) or carbon steel handles offer secure and comfortable operation during maintenance tasks.
Material Specifications & Configuration Options for Customized Solutions:
Core Components & Materials:
| Part | Material Options | Key Properties |
|---|---|---|
| Cover Plate | AL6063 Aluminum | Excellent plasticity, anodized finish, moderate strength |
| Q235-A Steel | Good toughness, hot workability, moderate weldability | |
| Q235-B Steel | Superior welding, excellent low-temperature toughness | |
| Seat & Coaming | AL6063 Aluminum | Lightweight, corrosion-resistant, anodized finish |
| Q235-A/B Steel | Durable, impact-resistant, weldable | |
| Handle | SUS304 Stainless Steel | Seawater-resistant, corrosion-proof, heavy-duty |
| Q235 Steel | Cost-effective, good weldability | |
| Sealing Gasket | Neoprene Rubber | Superior watertight performance, flame-retardant |
| Butadiene Rubber | Excellent oil resistance, abrasion-proof |
Marine Rising Manhole Cover Specifications:
- Standard: CB/T19-2001
- Application: Used for manholes on oil tanks, water tanks, and other storage compartments on various ships. Fixed on flat positions on the hold bottom, deck, and bulkhead.
- Watertight & Oil-Tight: Available in Type A, B, C, and D with round, oval, or square shapes to suit different requirements.
- Main Material:
- Cover: Carbon Steel
- Coaming: Carbon Steel
- Seal Ring: NBR (Nitrile Butadiene Rubber)
- Bolt, Nut, Washer: Stainless Steel, Carbon Steel, Copper
Main Size List (mm):
| Model | Nominal Size (LxB) | Diameter | L | L1 | L2 | B | B1 | B2 | S | Bolt Quantity | Weight (kgs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 450×350 | 450 | 470 | 570 | 350 | 370 | 470 | 4 | M20 | 16 | 23.2 (6 bolts), 30.8 (8 bolts), 36.9 (10 bolts), 45.8 (12 bolts) |
| 600×400 | 600 | 630 | 720 | 400 | 420 | 520 | 6 | 20 | 48.8 (8 bolts), 59.2 (10 bolts), 69.3 (12 bolts), 79.6 (14 bolts) | ||
| 800×600 | 800 | 820 | 920 | 600 | 620 | 720 | 8 | 26 | 52.4 (10 bolts), 65.8 (12 bolts), 78.2 (14 bolts), 90.2 (16 bolts) |
Note: The description might be incorrect, please contact us for confirmation.
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