Both-Side Operated Quick-Acting Pressure-Resistant Watertight Door | 0.1 MPa Marine Hinged Type

Product Overview

This both-side operated quick-acting pressure-resistant watertight door is a manually operated, single-leaf hinged door intended for openings in watertight bulkheads and compartment boundaries. It is normally considered for engine rooms, steering gear rooms, machinery-service spaces, and other locations where personnel need to operate the closing mechanism from either side of the boundary.

The supplied data states a water-pressure resistance of 0.1 MPa and four QAWT opening sizes. For procurement and shipyard installation, the door should be selected together with the pressure side, bulkhead cutout, frame welding interface, hinge handing, escape direction, gasket arrangement, fire-rating scope, and classification requirements. An A-60 version can only be described as fire-rated when the specific door construction and certificate scope are confirmed.

Quick Specifications

• Product type: Manual single-leaf hinged watertight door → quick-action closing gear can be operated from both faces of the bulkhead.
• Pressure resistance: 0.1 MPa as stated in the supplied data → final design pressure, test pressure, test duration, and leakage criteria require confirmation.
• Nominal opening range: 600 × 1400 to 700 × 1500 mm with R100 corners → four QAWT sizes cover common personnel-access openings.
• Installation dimensions: steel-wall cutout and overall frame dimensions are provided → supports shipyard opening preparation and replacement-door checks.
• Material options: mild steel or stainless steel → exact plate grade, frame material, hardware material, and corrosion-protection system should be specified.
• Operation: manual quick action from both sides → hinge side, opening direction, handwheel / lever arrangement, and locking layout should be confirmed by drawing.
• Fire performance: A-60 configuration can be arranged subject to approved design and valid fire-test / type-approval scope → watertight performance alone does not establish an A-60 rating.
• Inspection: hydraulic pressure testing according to the confirmed standard or project procedure → witness level and certification must be agreed before production.

Main Technical Parameters

Selection & Inquiry Guide

Step 1: Confirm QAWT1 / QAWT2 / QAWT3 / QAWT4, required clear opening, rounded-corner radius, and whether the order is for newbuilding or replacement.

Step 2: Confirm the design water pressure, pressure direction from one or both sides, hydraulic test pressure, test duration, and permitted leakage criteria.

Step 3: Confirm bulkhead location, steel-wall cutout, bulkhead thickness, surrounding reinforcement, frame welding detail, hinge side, and door swing direction.

Step 4: Confirm the operating arrangement: both-side handwheel / lever operation, linked quick-action mechanism, individual dog handles if applicable, and any anti-piracy locking requirement.

Step 5: Confirm material grades, gasket material, stainless-steel hardware scope, surface preparation, coating system, and any dissimilar-metal isolation requirement.

Step 6: Confirm A-60 fire rating, class society, MED / wheel-mark requirement, certificate scope, inspection witnessing, quantity, vessel type, delivery destination, and required delivery time.

Structure

Single steel door leaf | Welded bulkhead frame | Hinges and hinge-side reinforcement | Both-side quick-action operating gear | Perimeter locking points / dogs | Replaceable sealing gasket | Machined or controlled seating surface | Optional A-60 insulation and approved hardware | Optional anti-piracy lock

Watertight, Fire-Safety & Installation Advantages

• Both-side operation allows personnel to release or secure the door from either face of the bulkhead. This does not mean the leaf swings in both directions; hinge handing and escape-flow direction remain drawing-controlled items.
• A quick-action mechanism reduces the number of separate closing operations and helps apply distributed gasket compression around the perimeter when the linked locking gear is correctly adjusted.
• The supplied cutout and overall dimensions allow the shipyard to compare the door with the bulkhead opening before fabrication, which is especially important for replacement projects.
• Watertight performance depends on the combined condition of the leaf, frame, gasket, seating surface, dogs, hinge alignment, welding distortion, and final adjustment—not on gasket selection alone.
• For a door located in an escape route, the operating handles, locking arrangement, sill condition, swing direction, signage, and surrounding escape arrangement should be reviewed with the vessel designer and class society.
• An A-60 option requires a separately verified fire-rated construction, including insulation, door core / leaf build-up, frame details, penetrations, hardware, and certificate limitations.
• Hydraulic testing, dimensional inspection, operating-force checks, gasket-contact inspection, and coating repair after shipyard welding can be included according to the agreed inspection plan.

Custom Attributes

• Product Category: Pressure-resistant hinged watertight door → for personnel access through watertight boundaries.
• Operation: Manual, quick acting, operable from both sides → final handwheel / lever and linkage configuration to be confirmed.
• Leaf Type: Single leaf → hinge handing and swing direction must match the vessel arrangement.
• Pressure Rating: 0.1 MPa stated value → design basis and hydraulic acceptance procedure require confirmation.
• Nominal Size: 600 × 1400 to 700 × 1500 mm → select by access requirement, cutout, and replacement dimensions.
• Material: Mild steel / stainless steel → exact grades, mixed-material scope, and hardware materials to be confirmed.
• Fire Rating: Optional A-60 → available only for a certified configuration within the approved size and construction range.
• Closing / Security Option: Quick-action closing gear with optional anti-piracy locking arrangement → security function must not obstruct required emergency operation.
• Certificate Requirement: Maker certificate, material certificates, class certificate, MED documents, or witnessed test according to order scope → availability is subject to approval and confirmed documentation.

How It Works

Operator actuates the handle from either side → Quick-action gear moves the perimeter locking points → Door leaf is drawn evenly toward the frame → Gasket compresses against the seating surface → Watertight boundary is restored → Locking condition and gasket contact are checked

Applications

Engine rooms | Steering gear rooms | Machinery-service spaces | Watertight bulkhead access | Accommodation service boundaries where approved | Cargo-space boundary access where approved | Escape-route doors subject to vessel arrangement | Newbuilding projects | Replacement and repair projects

Certifications & Advantages

Certificates and approval documents can be arranged according to the confirmed product configuration, project requirement, inspection scope, material traceability, fire-rating scope, and class society approval procedure.

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

Drawing & Photos

FAQ

Q1: Does “both-side operated” mean the door leaf opens in both directions?

A1: No. It means the operating mechanism can be accessed from both faces of the bulkhead. The leaf normally remains a hinged door with a defined hinge side and swing direction, which must be confirmed on the arrangement drawing.

Q2: Can the same door be specified as both 0.1 MPa watertight and A-60 fire-rated?

A2: Yes, but only when the exact door construction has valid watertight and fire-approval evidence for the required size, installation boundary, hardware, and insulation arrangement. A generic watertight door should not automatically be described as A-60.

Q3: What information is required for a replacement door quotation?

A3: Provide the clear opening, steel-wall cutout, overall frame size, corner radius, bulkhead thickness, pressure side, hinge side, swing direction, operating-handle photos, fire-rating requirement, class requirement, quantity, and a drawing or clear installation photos.