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Hydraulic watertight closure, clear opening 6.0×8.5 m (Technical supply specification)


1. General Information (Operating Conditions)

The watertight closure operates reliably in marine environments under the following conditions:

  • Design ambient air temperature: +45°C with 80% humidity in summer; -40°C with wind speeds up to 25 m/s and 85% humidity in winter.
  • Water temperature: from +32°C to -2°C respectively.
  • Shipboard vibration.
  • Periodic sea spray on components.

2. Purpose

The watertight closure is designed to enclose boathouses/hangars. The weather-tight seal protects against flooding and prevents sea spray, dust, and external elements from entering the hangar. This includes operation at static ship heel angles up to 20° to port or starboard, and trim angles up to 10° by the bow or stern at minimum draft.

Hydraulic watertight closure, clear opening 6.0x8.5 m, general arrangement drawing (closed position)
Hydraulic watertight closure, clear opening 6.0×8.5 m, general arrangement drawing (closed position)

About

About Watertight Closures and Their Role in Modern Infrastructure

A watertight closure is a protective system component for marine and industrial facilities that provides a tight seal separating internal compartments from the external marine environment. This equipment is utilized where preventing the ingress of water, moisture, and contaminants into technical zones is critical. In the modern marine industry, a watertight closure is considered an integral part of the comprehensive safety system, protecting equipment, electrical systems, and structural components from the destructive effects of the environment.

The Importance of Watertight Solutions in Marine Operations

The marine environment is highly aggressive: salt spray, continuous humidity, vibration, and wave loads accelerate equipment wear. A watertight closure maintains the operational stability of internal systems and reduces the risk of emergencies. Additionally, these structures increase overall facility reliability by preventing water ingress into machinery and equipment spaces. Advancing technologies ensure that modern solutions deliver long-term sealing performance and resilience under harsh operating conditions.

Engineering and Manufacturing Approach

The development of such systems requires careful consideration of numerous factors, including operational conditions, industry standards, and material durability. In Russia, Izhora Hydrosystems LLC designs and manufactures solutions for the marine industry, including watertight closures. The manufacturing approach focuses on ensuring structural reliability, stable equipment operation in aggressive environments, and compliance with industry customer requirements without unnecessary design complexity.

Technological Development and Modern Trends

Modern watertight closures are increasingly integrated into intelligent engineering systems. Industry trends include the application of advanced materials, extended component service life, and the implementation of condition monitoring systems. This enables early detection of potential operational deviations and reduces the probability of unscheduled maintenance. Consequently, operational safety is enhanced, and lifecycle maintenance costs are reduced.


3. Scope of Supply

3.1 Hydraulic watertight closure clear opening 6.0×8.5 m (vertical opening axis)

3.1.1 Product Composition

ComponentQuantity
Closure panels assembly with hydraulic drive for opening and cleating1 set
Control system kit for wheelhouse installation1 pc
Local control system kit: stationary and portable1 pc
Indicator and limit switch kit1 pc
Hydraulic power unit (includes hydraulic power module with electric pump, backup hand pump, and oil tank; control valves; hydraulic valves and instrumentation for condition monitoring and system protection; piping for connection to actuators/hydraulic cylinders)1 pc
Hydraulic watertight closure, clear opening 6.0x8.5 m, general arrangement drawing (open position)
Hydraulic watertight closure, clear opening 6.0×8.5 m, general arrangement drawing (open position)

3.1.2 Main Parameters

ParameterValue
Clear opening6.0×8.5 m
Structural steel materialGrade D36 steel per GOST 52927-2015 (plates) and Grade D bulb flats per GOST 21937-76, or equivalent in physicochemical properties
Panel drive typeHydraulic (hydraulic cylinders)
Cleat typeHydraulic wedge cleats (hydraulic cylinders)
Seal typeRubber sealing along the coaming and at panel joints
Tightness classWatertight against sea action
Estimated weight17,500 kg
Hydraulic system operating pressureMax. 25 MPa
Main power supply380 V, 50 Hz
Auxiliary power supply (control panels, heaters)230 V, 50 Hz
Electromagnetic compatibility with other shipboard equipmentIn accordance with RS Rules
Enclosure rating for outdoor electrical equipment, min.IP56
Sea state, max.4
Compliance with Classification Society (RS) requirementsYes
Operating conditions during closure handling— Continuous ship heel to either side: up to 5°— Continuous ship trim by the bow or stern: up to 2°— Wind pressure: max. 400 Pa— Shipboard vibration
Operating conditions in stowed (sea) position— Ambient air temperature: from -40°C to +45°C— Ship heel to either side: up to 15°— Ship trim by the bow or stern: up to 5°— Wind pressure: max. 2000 Pa— Shipboard vibration

3.1.3 Spare Parts Kit (SPC)

Manufacturer’s standard spare parts kit for 1-year operation — 1 set

3.1.4 Documentation

DocumentQuantity
Product passport / Data sheet1
Installation, commissioning, and adjustment instructions1
Operating manual1
Shipboard test program and procedure1
Factory acceptance test (FAT) protocol1
List of spare parts1

3.1.5 Certificates

RS Certificate (Form 6.5.30), Russian Navy Gosgortekhnadzor acceptance — 1 pc

Hydraulic watertight closure, clear opening 6.0x8.5 m, isometric view
Hydraulic watertight closure, clear opening 6.0×8.5 m, isometric view

4. Additional Requirements

  • All electrical equipment features an IP56 enclosure rating.
  • Coating system: the coating scheme and color shall be agreed upon with the Customer (the applied coating system must be selected from the list of coatings approved for surface combatants and naval vessels).
  • All interfaces between the closure control system and connected systems shall comply with paired data and electrical interface protocols developed in accordance with RD V.8824-89.
  • Preservation coatings shall provide an indoor storage life of 12–18 months.
  • Hydraulic system working fluid: AUP hydraulic oil.
  • Working fluid cleanliness class per GOST 17216-71: min. Class 12.
  • Lubricants and fluids used on board shall comply with GOST RV 50920-2005 “Fuels, oils, lubricants, and special fluids”.
  • Power supply cables shall be equipped with mating connectors.
  • Emergency operation for opening/closing the watertight closure shall be provided in the event of a main power failure.
  • The local control station shall be equipped with a local alarm and indication system.
  • The watertight closure shall be equipped with position and displacement sensors routing signals to the control and monitoring stations.
  • The watertight closure shall be equipped with warning and emergency alarms.
  • The closure design shall incorporate an interlocking system with the corresponding launch and recovery system (LARS) mechanism.
  • The watertight closure, along with its mechanisms and systems, provides integrated operation with the corresponding launch and recovery system (LARS) and ensures unobstructed passage of rescued personnel and crew from the deep submergence rescue vehicle (DSRV) to the hyperbaric chamber complex.
  • The equipment complies with GOST RV 20.39.308-98 regarding electromagnetic field (EMF) immunity.
  • The integrity of the equipment located on open deck areas is ensured under all weather conditions, with unlimited sea state, and without restrictions regarding motion, wave impact loads, green water shipping, sea spray, and slamming.
  • Metrological support complies with the requirements of GOST R 8.563-2009, GOST RV 8.570-98, GOST RV 20.39.309-98, GOST RV 20.57.310-98, OTT 1.1.7-89, RD V 319.01.13-98, GOST RV 0008-000-2019, GOST RV 0008-003-2019, GOST RV 0008-006-2020, GOST RV 0020-39.309-2019, GOST R 8.563-2009, Order of the Ministry of Defense of the Russian Federation No. 3 dated January 15, 2019 “Procedure for Mandatory Metrological Expertise of Weapons, Military and Special Equipment Samples and Complexes and Their Technical Documentation in the Armed Forces of the Russian Federation”, and other national and military state standards.
  • All equipment is supplied with pre-installed identification plates in Russian.
  • The equipment is delivered in sealed, non-returnable packaging that protects the goods against precipitation and mechanical damage during temporary storage.
  • The arrangement of mechanisms, equipment, and shipboard control stations complies with safety regulations for sea-going vessels. Safety condition requirements are ensured in accordance with RD 31.81.01.87 “Safety Requirements for Sea-Going Vessels”.
  • The supplied equipment complies with environmental protection requirements:
    • Russian Federation Law No. 7-FZ of 2002 (as amended on December 25, 2023) “On Environmental Protection”;
    • Russian Federation Law No. 174-FZ of 1995 “On Ecological Expertise”;
    • Russian Federation Law No. 155-FZ of 1995 “On Internal Maritime Waters, Territorial Sea and Contiguous Zone of the Russian Federation”;
    • Russian Federation Law No. 96-FZ of 1999 “On Protection of Atmospheric Air”;
    • OTT 1.1.10-99, Part 2 “Weapons and Military Equipment Systems and Complexes (Samples). General Requirements for Environmental Safety”.
  • The composition of environmental (pollution prevention) equipment complies with the Requirements of the Rules for the Prevention of Pollution from Ships Operating in Marine Areas and Inland Waterways of the Russian Federation, ND No. 2-020101-143, 2021.

5. Manufacturer

Izhora Hydrosystems LLC


6. Warranty Period

5 years from the date of vessel delivery to the State Customer.


Contacts

Phone: +7 (812) 339-61-68

Email: contact@i-hydro.tech