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Marine stern shell door 1850x800mm (Technical supply specification)


1. General Data (Operating Conditions)

Design ambient air temperature:

+30 °C at 65% humidity in summer and –25 °C at 85% humidity in winter.

Water temperature: from +25 °C to –2 °C.


2. Purpose

The equipment is designed for installation in the vessel’s stern area. It provides weathertightness against sea actions, allows manual opening and cleating, and ensures complete clear opening clearance when the door leaf is open.

Stern door 1850x800mm general arrangement drawing side view, front view
Stern door 1850x800mm general arrangement drawing side view, front view

About

Stern Doors: Critical Components for Vessel Integrity

In shipbuilding, every component is vital. A stern door separates internal compartments from the external environment, preventing water ingress into the hull. Manufacturing quality directly impacts vessel safety and cargo preservation during transit.

Engineering Precision and Durability

Designing these components requires careful consideration of structural loads generated by wave action, temperature fluctuations, and vibrations. Proper selection of steel grades, sealing materials, and door leaf geometry is essential to maintain tight integrity and operational reliability during long-term service.

Izhora Hydrosystems LLC Manufacturing Process

Engineering and manufacturing at the company’s facilities strictly follow design documentation. Every assembly undergoes weld testing, geometric inspection, and tightness verification. Modern metal processing technologies ensure extended service life and stable mechanism operation.

Operational Efficiency and Maintenance

The door leaf design allows effortless opening and closing operations, even under high humidity and temperature variations. Engineered manual control and locking in the open position enhance crew safety and eliminate hull damage risks. All components allow easy maintenance and inspection access.

Application in Modern Shipbuilding

Stern doors are installed on various vessel types, ranging from cargo transport to research vessels. Izhora Hydrosystems LLC products are specified for their precision, advanced engineering, and compliance with maritime standards, making them an essential part of modern marine structures.


3. Scope of Supply

3.1 Stern Door 1850×800 mm

3.1.1 Bill of Materials

ComponentQty
Door assembly1
Position sensors1
Supplier instruction board for installation near the stern door1
Technical documentation and certificates1
Spare parts kit (SPTA kit)1
Stern door 1850x800mm general arrangement drawing top view
Stern door 1850x800mm general arrangement drawing top view

3.1.2 Technical Data

ParameterValue
TypeSingle-leaf, hinged, weathertight against sea action
ActuationManual
Clear opening1850 × 800 mm, corner radii R 55 mm
Design external pressureMin. 75 kPa
Cleating device forceMin. 75 kN
Door leafSteel grade RSD 36, 8 mm, flush with vessel hull plating
CoamingSteel grade 09G2S, welded installation
InsulationROCKWOOL SeaRox 620 ALU A30
HingesStructural steel
SealingFire-resistant sealing gasket
Cleats10 pcs, centralized hydraulic actuation, structural steel
Electrical equipment“Closed”/”Cleated” indication sensors, signal output to wheelhouse panel
Internal liningPlate 2 mm
Coating systemIn accordance with Buyer’s options

3.1.3 Spare Parts Kit (SPTA Kit)

Delivered in accordance with the standard kit specified for stern door operation.

3.1.4 Documentation

Document TitleQty
Operating Instructions1
Technical Passport1
General Arrangement Drawing1
Certificates of Conformity1 set

3.1.5 Certification

The products are certified by the Russian Maritime Register of Shipping (RMRS).


4. Additional Requirements

  • The coaming edges at the bottom of the stern door are radiused to prevent pilot ladder chafing.
  • Each stern door is wrapped in a non-woven soft sheet material and packed into a wooden crate.
  • Dimensional tolerances for the completed stern door and coaming are ± 2 mm from the nominal values.

5. Manufacturer

Izhora Hydrosystems LLC


6. Warranty Period

12 months from the delivery date, unless otherwise specified in the contract.


Contacts

  • Phone: +7 (812) 339-61-68
  • Email: contact@i-hydro.tech