Hydraulic Watertight Ship Side Door | 180° Opening Side Shell Access Door for

Product Specification

Hydraulic Watertight Ship Side Door | 180° Opening Side Shell Access Door for Research and Offshore Vessels

Product Overview

The hydraulic watertight ship side door is a large side-shell access door used on research vessels, offshore support vessels, and special-purpose ships where cargo, equipment, personnel access, or mission operation requires a controlled opening in the vessel side. The door is normally designed together with the hull opening, surrounding reinforcement, sealing system, hydraulic cylinder arrangement, HPU / electro-hydraulic control, local hand pump, remote control requirement, and class inspection scope.

This page covers customized hydraulic side doors with clear opening sizes from 3000 × 3000 mm to 4000 × 4000 mm according to the supplied table. The door can be configured for watertight, weathertight, gastight, sound-proof, or fire-rated service when specified by the project. The final tightness class, fire class, hydraulic pressure, operating logic, emergency closing arrangement, and certificate level must be confirmed according to the vessel design and class approval requirement.

Quick Specifications

• Product type: hydraulic watertight / weathertight ship side door → side-shell access and closing appliance for vessel side openings.
• Typical application: research vessels, offshore support vessels, special-purpose ships, cargo access areas, and mission equipment handling positions → final location must follow the vessel arrangement drawing.
• Clear size range from supplied table: 3000 × 3000 mm to 4000 × 4000 mm → suitable for large side access openings requiring hydraulic assistance.
• Bulkhead / shell opening reference: clear size + 450 mm in both directions → useful for preliminary hull opening and frame layout checking.
• Operation: hydraulic cylinder with HPU, electric pump unit, electro-hydraulic control, remote operation, and hand pump options → emergency/manual operation should be confirmed before order.
• Opening angle: up to 180° according to supplied data → installation space, hinge direction, cylinder stroke, and stopper arrangement must be checked by drawing.
• Material options: mild steel, stainless steel, or aluminium → select according to hull material, corrosion environment, weight target, and welding compatibility.
• Test and certificate scope: hose test, air test, chalk test, hydraulic pressure test, fire approval, gastightness test, and class certificate can be arranged according to project requirement.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm door type and location: side shell door, bulkhead door, accommodation access, cargo hold access, or special mission access opening.

Step 2: Confirm tightness requirement: watertight, weathertight, gastight, sound-proof, fire-rated, or combined requirement according to vessel design and class approval.

Step 3: Confirm clear size, hull / bulkhead opening size, opening direction, hinge side, 180° opening space, cylinder position, and whether the door is single leaf or double leaf.

Step 4: Confirm operation system: hydraulic cylinder, HPU, electric pump unit, electro-hydraulic control, remote operation, local control, hand pump, and emergency closing requirement.

Step 5: Confirm material and finishing: mild steel, stainless steel, aluminium, coating system, polished stainless steel parts, gasket material, and corrosion protection method.

Step 6: Confirm inspection and certificate scope: hose test, air test, chalk test, hydraulic pressure test, gastightness test, fire approval test, type approval, MED approval, and class witness requirement.

Step 7: Provide GA drawing, hull structure drawing, installation position, opening size, vessel type, class society, quantity, delivery destination, and required delivery time.

Structure

Door leaf | Welded door frame / coaming | Hinge and shaft arrangement | Hydraulic cylinder bracket | HPU / control unit | Locking / dogging device | Seal gasket | Emergency hand pump | Local and remote control interface | Surface coating or specified finishing

Hydraulic, Sealing & Class Inspection Advantages

• Hydraulic cylinder operation is suitable for large side doors where manual opening would be difficult because of door weight, hinge moment, gasket compression, and ship motion.
• The 180° opening arrangement helps keep the door leaf clear of the working opening, but hinge side, door swing envelope, cylinder stroke, deck equipment clearance, and sea-fastening point must be checked by GA drawing.
• The welded frame and surrounding hull reinforcement are critical for door sealing and structural load transfer. Frame flatness, weld distortion control, and gasket compression should be checked before final assembly.
• Watertight, weathertight, gastight, sound-proof, and fire-rated configurations require different design details. They should not be treated as identical options without confirming gasket, insulation, locking, and test requirements.
• Hydraulic operation can be arranged with local HPU, electric pump unit, electro-hydraulic control, remote operation, and hand pump backup according to vessel operating philosophy and class requirement.
• Door closing status, hydraulic interlock, unauthorized opening prevention, alarm, and remote indication should be confirmed when the door is installed in a side shell position or other critical boundary.
• Hose test, air test, chalk test, hydraulic pressure test, gastightness test, and fire approval test can be arranged according to the agreed inspection scope; the exact test pressure, duration, acceptance criteria, and witness scope should be confirmed before production.
• Large customized side doors should be reviewed together with hull opening, drainage, sill / threshold design, corrosion protection, maintenance access, and spare seal replacement plan.

Custom Attributes

• Standard Reference: CB 672 / GB 10840 / CB/T 3007 / CB 3041 / ISO standard → apply only when the vessel drawing or project specification confirms the exact standard and edition.
• Clear Size: 3000 × 3000 mm to 4000 × 4000 mm from supplied table → final clear opening and structural opening should be checked by approved drawing.
• Operation Mode: hydraulic cylinder with HPU / electric pump / electro-hydraulic control / hand pump → select according to door size, operating frequency, emergency operation, and remote-control requirement.
• Opening Angle: up to 180° → hinge, cylinder, stopper, handrail, deck equipment, and side shell clearance should be verified before fabrication.
• Material: mild steel / stainless steel / aluminium → material choice affects welding, corrosion protection, weight, fire rating, and hull compatibility.
• Tightness Category: watertight / weathertight / gastight / sound-proof / fire-proof as applicable → final category must be defined by project specification, not assumed by product name alone.
• Leaf Type: single leaf / double leaf / single skin / double skin → selected by size, stiffness, insulation, fire rating, and operating arrangement.
• Closing Device: anti-piracy or security locking device available when specified → details should be confirmed with vessel security and class requirements.
• Certificate Requirement: type approval, EC MED type approval, or class certificate available according to order scope → certificate level is subject to project approval and class inspection.

How It Works

Operator activates local or remote control → HPU / electric pump / hand pump supplies hydraulic pressure → Hydraulic cylinder opens or closes the door leaf → Locking / dogging device compresses the gasket against the frame → Door closing status, tightness test, and class inspection are completed according to project requirement

Applications

Scientific research vessels | Offshore support vessels | Special-purpose ships | Side shell access openings | Cargo and equipment access areas | Accommodation or service access when approved | Watertight / weathertight boundary doors | Newbuilding and retrofit projects

Certifications & Advantages

Certificates can be arranged according to project requirement, inspection scope, material traceability, test requirement, and class society approval procedure.

Certification: CCS, NK, BV, ABS, DNV, LR, KR, IRS, RS, RINA, CRS, Makers Test Certificate.

Drawing & Photos

FAQ

Q1: Is this product always watertight, weathertight, gastight, fire-proof, and sound-proof at the same time?

A1: No. These are different design and test categories. The required tightness or fire class should be confirmed according to the vessel location, class requirement, gasket design, insulation, locking arrangement, and test method.

Q2: Can the side door be operated if the electric power supply is not available?

A2: A hand pump or emergency manual operation can be arranged when specified. The required emergency operation method, closing time, remote indication, hydraulic circuit, and operating position should be confirmed before quotation.

Q3: What information is needed before quotation?

A3: Confirm clear size, structural opening, door location, opening direction, material, tightness class, fire / gas / sound requirement, hydraulic control mode, class society, test scope, GA drawing, installation drawing, quantity, delivery destination, and required delivery time.