Ship Bottom Plug
Ship Bottom Plug is a marine drainage component installed at the bottom of ships for hull drainage, inspection, and maintenance purposes.
Designed for commercial vessels and marine engineering applications, the bottom plug provides a reliable sealing function to prevent seawater leakage during normal operation while allowing controlled drainage when required.
Ship Bottom Plug is commonly installed at the lowest points of:
Ship hull structures
Engine rooms
Ballast compartments
Fresh water tanks
Drainage pipelines
Marine equipment systems
It is widely used on:
Cargo ships
Bulk carriers
Container ships
Tankers
Workboats
Offshore vessels
Overview
Working Principle of Ship Bottom Plug
Ship Bottom Plug works as a removable sealing device installed on the bottom area of a vessel.
During normal navigation:
The plug remains tightly installed.
The sealing surface prevents seawater penetration.
The hull structure remains watertight.
During maintenance:
The plug is removed manually.
Accumulated water inside the hull is discharged.
The plug can be reinstalled after drainage.
Main Components of Ship Bottom Plug
| Component | Function |
|---|---|
| Plug Body | Main sealing component |
| Threaded Shaft | Connects with hull drain fitting |
| Hex Head | Allows tightening and removal |
| Sealing Surface | Prevents leakage |
| Gasket / Washer | Improves watertight performance |
Applicable Standards of Ship Bottom Plug
| Standard Category | Applicable Standards |
|---|---|
| Marine Drain Plug Standard | CB/T4248-2013 |
| Shipbuilding Standards | CB/T Series |
| Chinese Marine Standards | GB/T Standards |
| Material Standards | ASTM / EN Standards |
| Quality Management | ISO 9001 |
| Classification Requirements | CCS / ABS / DNV / LR |
Types of Ship Bottom Plug
Threaded Ship Bottom Plugļ¼The most common type used for ship hull drainage.
Features:
Threaded connection
Easy replacement
Reliable sealing
Applications:
Commercial vessels
Ship repair projects
New vessel construction
Flanged Ship Bottom Plug: Installed with flange connection
Features:
Strong connection
Suitable for larger drainage openings
Higher mechanical strength
Applications:
Large vessels
Marine equipment systems
Drain Screw Plug Type: Compact design for drainage openings.
Applications:
Engine room drainage
Tank drainage
Auxiliary systems
Material Selection of Ship Bottom Plug
| Material | Features | Applications |
|---|---|---|
| Stainless Steel | Excellent seawater corrosion resistance | Offshore vessels |
| Brass | Good corrosion resistance and machinability | General ships |
| Bronze | Traditional marine material | Shipbuilding applications |
| Aluminum Alloy | Lightweight | Small vessels |
| Steel | High strength | Heavy-duty applications |
Common Material Standards
| Material | Standard |
|---|---|
| Stainless Steel | ASTM A276 |
| Brass | ASTM B16 |
| Bronze | ASTM B62 |
| Aluminum Alloy | ASTM B209 |
| Steel | ASTM A216 |
Technical Specifications of Ship Bottom Plug
| Item | Specification |
|---|---|
| Product Name | Ship Bottom Plug |
| Application | Ship Hull Drainage |
| Installation Position | Vessel Bottom / Hull Drain Opening |
| Connection Type | Threaded |
| Medium | Water / Seawater |
| Material Options | Stainless Steel / Brass / Bronze |
| Sealing Type | Gasket / Washer |
| Standard | CB/T4248-2013 Available |
Advantages of Ship Bottom Plug
| Feature | Benefit |
|---|---|
| Watertight Design | Prevents seawater leakage |
| Marine Materials | Suitable for harsh environments |
| Easy Maintenance | Simple removal and replacement |
| Compact Structure | Saves installation space |
| Reliable Sealing | Improves vessel safety |
Applications of Ship Bottom Plug
| System | Function |
|---|---|
| Hull Drainage System | Removes internal water |
| Engine Room | Drains accumulated water |
| Ballast Tank | Provides maintenance drainage |
| Ship Repair | Allows hull inspection |
| Marine Equipment | Seals drainage openings |
