Quick-Acting Steel Watertight Door with Dual-Side Handwheel | Marine Bulkhead

Product Specification

Quick-Acting Steel Watertight Door with Dual-Side Handwheel | Marine Bulkhead Hinged Door

Product Overview

This quick-acting steel watertight door is a manually operated, single-leaf hinged door for access openings in watertight bulkheads where the vessel arrangement and applicable rules permit a hinged quick-acting closure. A handwheel is provided on both sides so the securing mechanism can be operated from either compartment. The steel frame is intended for direct welding into the bulkhead, while the rounded-corner opening, door leaf, hinges, gasket seat, and securing arrangement must be coordinated with the approved ship drawing.

The available data states a normal pressure range of 0.05–0.06 MPa, approximately equivalent to a 5–6 m freshwater head. This value is a project selection reference, not a universal rating: the required design pressure, pressure direction, installation level, bulkhead category, and test pressure must be confirmed for each vessel. Watertight, weathertight, fire-rated, gastight, acoustic, anti-piracy, and powered versions are separate configurations and should not be combined into one product claim unless the complete assembly and approval scope have been verified.

Quick Specifications

• Product type: manual quick-acting hinged watertight door → intended for bulkhead access where fast operation from both sides is required and a hinged closure is accepted.
• Operation: handwheel on each side → the operator can engage or release the quick-acting securing mechanism from either compartment.
• Installation: welded steel frame → bulkhead cutout, surrounding reinforcement, frame flatness, weld sequence, and distortion control must follow the approved installation drawing.
• Reference pressure: 0.05–0.06 MPa → approximately 5–6 m freshwater head; final design and test pressure are to be confirmed from the vessel damage-control and class requirements.
• Nominal opening range: 1200 × 600 to 1600 × 800 mm → nine opening combinations are listed for access and arrangement selection.
• Leaf plate options: 6 / 8 / 10 mm → available combinations and approximate weights depend on the selected clear opening.
• Approximate weight: 124 to 238 kg → relevant to hinge support, handling, welding sequence, commissioning, and spare-part planning.
• Material and functions: mild steel is the primary configuration → stainless steel, aluminium, fire-rated, gastight, sound-reducing, powered, or anti-piracy versions require separate engineering confirmation.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm that a manual hinged quick-acting watertight door is permitted at the intended bulkhead and access route. A hinged door is not interchangeable with a power-operated sliding watertight door in locations where the vessel rules require a sliding type.

Step 2: Select the nominal opening and provide the bulkhead cutout drawing, opening direction, hinge side, sill height, adjacent structure, insulation/lining thickness, and operating-clearance envelope on both sides.

Step 3: State the design water head or pressure, pressure direction, compartment arrangement, damage waterline basis, and whether the door must withstand pressure from one side or both sides.

Step 4: Confirm door and frame material, leaf plate thickness, gasket material, hinge and securing-material requirements, surface preparation, coating system, corrosion allowance, and any stainless-steel interface details.

Step 5: Confirm the required function: watertight only, weathertight, fire-rated, gastight, sound-reducing, anti-piracy locking, or powered operation. Fire, gas, acoustic, and security functions require dedicated design evidence and cannot be assumed from a standard watertight door.

Step 6: Provide quantity, vessel or offshore-unit type, installation location, classification society, certificate and witness scope, delivery destination, required delivery date, approved drawing, and reference photo if available.

Structure

Welded steel frame | Single hinged steel leaf | Rounded-corner opening | Dual-side handwheels | Quick-acting securing mechanism | Perimeter gasket and compression seat | Hinges and stops | Internal and external operating access | Surface-protection system

Watertight, Installation & Quality Advantages

• Dual-side handwheel operation supports rapid local opening and closing without requiring an external power source. The final linkage, number of securing points, operating torque, and emergency-release arrangement must follow the approved design.
• A quick-acting securing system is intended to apply distributed compression around the gasket perimeter. Uniform sealing depends on frame flatness, correct dog adjustment, gasket condition, hinge alignment, and controlled leaf deflection.
• The rounded-corner opening and frame geometry avoid sharp rectangular transitions in the supplied dimensional scheme. The actual corner radii and bulkhead cutout must be maintained during fabrication and shipyard installation.
• Direct welding to the bulkhead provides an integrated boundary, but excessive heat input can distort the frame and reduce gasket contact. Welding sequence, temporary bracing, dimensional inspection, and post-weld alignment are important acceptance points.
• Door mass increases with opening size and plate thickness. Hinge capacity, opening restraint, handling points, lifting method for installation, and safe manual operation should be reviewed before final approval.
• The stated 0.05–0.06 MPa pressure range should be treated as a selection reference. Prototype pressure testing, production leakage testing, onboard seating checks, and witness requirements depend on the applicable standard, class rules, and approved inspection plan.
• Coating continuity is required at the frame, leaf edges, hinges, welds, and recessed hardware. Final paint compatibility with the vessel coating specification and gasket material should be confirmed before shipment.

Custom Attributes

• Product Type: Quick-acting steel watertight door → manual hinged access closure for approved watertight bulkhead locations
• Operation: Dual-side handwheel → allows local operation from either side of the bulkhead
• Nominal Opening: 1200 × 600 to 1600 × 800 mm → select according to access requirement, structure, and approved vessel drawing
• Reference Pressure: 0.05–0.06 MPa → approximately 5–6 m freshwater head; project design and test pressure remain to be confirmed
• Leaf Plate Thickness: 6 / 8 / 10 mm → availability depends on the nominal opening combination in the supplied table
• Primary Material: Mild steel → stainless steel and aluminium are separate engineered variants, not direct material substitutions
• Mounting: Welded bulkhead frame → cutout accuracy, reinforcement, weld sequence, and distortion control affect final watertightness
• Opening Hand: Left-hand or right-hand, to be confirmed → mark hinge side and opening direction on the approved drawing
• Seal System: Perimeter gasket, material to be confirmed → gasket profile, compression, joining method, and replacement access are project-specific
• Fire / Gas / Acoustic Rating: To be confirmed → only state a rating when the complete door assembly has the applicable test and approval evidence
• Anti-Piracy Locking: Available by project → internal release, escape-route compatibility, locking logic, and class/flag acceptance must be reviewed
• Certificates: According to project requirement → approval, material traceability, testing, and witness scope must be agreed before production

How It Works

Turn the handwheel from either side → The quick-acting securing mechanism releases or engages the perimeter securing points → The hinged leaf opens or closes → Final handwheel movement compresses the gasket against the frame seat → Seating, alignment, and leakage are checked during commissioning

Applications

Watertight subdivision bulkheads | Machinery-space access positions | Shaft-tunnel or service-space access where hinged doors are permitted | Pump rooms and technical compartments | Workboats and merchant vessels | Offshore-unit compartments subject to project approval | Newbuilding and replacement projects

Certifications & Advantages

Certificates, approval documents, material traceability, pressure or leakage testing, and inspection witnessing can be arranged according to project requirement, applicable rules, approved drawing, and classification-society procedure. Type approval, EC MED approval, fire certification, or class product certification is not included by default.

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

Drawing & Photos

FAQ

Q1: Is the 0.05–0.06 MPa pressure range suitable for every installation?

A1: No. It is the reference range provided for this product data. The required design and test pressure must be established from the installation level, damage waterline, pressure direction, vessel rules, approved drawing, and classification-society requirements.

Q2: Can this hinged handwheel door replace a hydraulic or power-operated sliding watertight door?

A2: Not automatically. Some watertight bulkhead locations require sliding or power-operated doors under the applicable vessel rules. The ship designer and classification society must confirm that a manual hinged quick-acting door is acceptable at the intended location.

Q3: Are fireproof, gastight, soundproof, anti-piracy, and class certificates included as standard?

A3: No. These are separate functional and approval scope. The required rating, test standard, locking and escape arrangement, class witness, type approval, and certificate package must be agreed before quotation and supported by the relevant design and test evidence.