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Marine Equipment
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Deck Seal Suppliers
Inert gas (IG) systems on tankers use a deck seal to stop flammable vapors from flowing back toward the IG plant during cargo handling. The unit acts as a one-way liquid barrier between the cargo side and the gas generation side. SOLAS requires it on any vessel carrying oil, chemicals, or liquefied gas above set tonnage limits.
RecordsMarine maintains a directory of deck seal suppliers for newbuild project teams, conversion yards, and superintendents sourcing units to fit their IG plant.
Designs Available on the Market
Tanker fleets use three main configurations:
- Semi-flooded (wet) units — kept full of water, low maintenance
- Dry rotating-disc units — used where pressure loss must stay low
- Hybrid wet/dry assemblies — fitted on some gas carrier projects
Older crude and product tankers run wet versions, since they handle rough seas and dirty water without issue. Higher-capacity IG plants on modern tankers tend to use dry models for better energy efficiency. Approved suppliers of deck seal units provide sizing data so the design can be matched to cargo flow, stripping capacity, and pump rates before placing the order.
Vessels That Need Them
SOLAS requires a deck seal on:
- Crude oil and product tankers
- Chemical and parcel tankers
- LNG, LPG, and ethylene carriers
- FPSOs and FSOs
- Shuttle tankers and bunker barges above regulatory cutoffs
Smaller workboats and bunkering craft below SOLAS thresholds may use a simpler water lock or check valve. Once flammable cargo limits are crossed, a full deck seal is mandatory. Sourcing from recognized providers of deck seal equipment keeps the installation paperwork acceptable to class surveyors from the first inspection.
Names That Lead the Category
A small group of original makers dominates global supply:
- Alfa Laval (Smit Gas)
- Wärtsilä Moss
- Hamworthy (now part of Wärtsilä)
- Coldharbour Marine
- Survitec (Maritime Protection division)
- Kashiwa
- Sumitomo Precision Products
These brands cover both newbuild scope and dry dock retrofits. Approved distributors of deck seal equipment also carry the matched accessories — float kits, demister cartridges, drain valves, P/V valve seats — needed during scheduled overhauls.
Points Worth Clarifying at Quote Stage
A short checklist that helps avoid commissioning issues:
- Required IG flow rate (m³/h) and operating pressure
- Seal type — wet, dry, or combined
- Materials suited to your cargo grades
- Type-approval certificate valid for the vessel's flag
- Delivery slot that fits the yard schedule
- Drawings, factory test data, and installation manuals
- Whether the supplier sends a commissioning engineer
Confirming these in writing prevents disputes later.
Regulatory Framework
Deck seal approval and operation follow SOLAS Chapter II-2 Regulation 4, IMO MSC.1/Circ.1280, ISGOTT recommendations for tanker operations, and IACS class rules. A factory-tested seal ships with a document folder containing material traceability, pressure test reports, and approval letters that surveyors review during gas trials.
Frequently Asked Questions
What service life can be expected?
Most maintained units stay in service for 20 to 25 years before a major rebuild.
Is converting from wet to dry feasible?
Yes. The change needs new piping and class re-approval, usually done during a scheduled docking.
How fast can a new unit be supplied?
Catalog sizes ship in 4 to 8 weeks. Engineered-to-order units for large IG plants can take 16 to 20 weeks.
Does the price include start-up assistance?
Some OEMs include it. Others quote it separately or leave it to a yard subcontractor.
What testing happens before shipment?
Each seal goes through hydrostatic and leak testing at the works, with certificates included.
Find Deck Seal Supplier Near You
The list below covers deck seal makers and authorized agents working with shipyards and tanker fleets in major maritime regions. Compare the listings, request quotations directly, and pick a partner that fits your IG project.
premium

Year Founded: 2011
RM verifiedCATEGORIES:
Deck Seal
15 PPM Monitoring Equipment
Air Compressors
Air Driven Motors
Air Horns
(13)
BRAND:
WARTSILA
CLASS APPROVED:
IACS: CCS
WAREHOUSES:
China

Year Founded: 2004
VerifiedCATEGORIES:
Deck Seal
Air Compressors
Engines (2-Stroke)
Engines (4-Stroke)
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Accommodation Ladder Davits
Accommodation Ladders & Gangways
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
(150)
CLASS APPROVED:
IACS: ClassNK, BV

Year Founded: 2018
RM verifiedCATEGORIES:
Deck Seal
15 PPM Monitoring Equipment
Accommodation Ladder Davits
Accommodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
AIS (Automatic Identification Systems)
Alpha Lubrication Systems
AMS (Alarm Monitoring Systems)
Anemometers
Anti-Heeling Systems
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Automation Control Equipment & Control Units
Autopilot
BackWash Filters
BNWAS (Bridge Navigational Watch Alarm Systems)
(151)

Year Founded: 2009
CATEGORIES:
Deck Seal
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Accommodation Ladder Davits
Accommodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
Alpha Lubrication Systems
Anemometers
(160)
WAREHOUSES:
Bangladesh

Year Founded: 2024
CATEGORIES:
Deck Seal
15 PPM Monitoring Equipment
AIS (Automatic Identification Systems)
AMS (Alarm Monitoring Systems)
ARPA (Automatic Radar Plotting Aids)
AUS (Automatic Unloading Systems)
Accommodation Ladder Davits
Accommodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
Alpha Lubrication Systems
Anemometers
(159)
WAREHOUSES:
Bangladesh

Year Founded: 1995
CATEGORIES:
Deck Seal
15 PPM Monitoring Equipment
Accommodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Starters
AMS (Alarm Monitoring Systems)
Autopilot
BWTS (Ballast Water Treatment Systems)
Centrifugal Pumps
Compass (Gyro & Magnetic)
Diesel Generators
Electrical Actuators
Electrical Horns
Engine Room Ventilation Fans
Engines (2-Stroke)
Engines (4-Stroke)
Engine Starting Systems
Exhaust Gas Turbochargers
(41)

Year Founded: 2022
CATEGORIES:
Deck Seal
AMS (Alarm Monitoring Systems)
Accommodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Anti-Heeling Systems
Automation Control Equipment & Control Units
Alpha Lubrication Systems
(157)
CLASS APPROVED:
IACS: ABS, RINA, ClassNK, CCS, BV, CRS, PRS, TL, KR, LR, DNV, IRS
Non-IACS: RMRS, HRS, INSB Class, Other
WAREHOUSES:
China
Year Founded: 2025
CATEGORIES:
Deck Seal
15 PPM Monitoring Equipment
Accommodation Ladder Davits
Accommodation Ladders & Gangways
Air Compressors
Air Driven Motors
Air Horns
Air Reservoirs
Air Starters
AIS (Automatic Identification Systems)
Alpha Lubrication Systems
AMS (Alarm Monitoring Systems)
Anemometers
Anti-Heeling Systems
ARPA (Automatic Radar Plotting Aids)
(157)
CLASS APPROVED:
IACS: CCS
Year Founded: 2010
CATEGORIES:
Deck Seal
AMS (Alarm Monitoring Systems)
Automation Control Equipment & Control Units
BWTS (Ballast Water Treatment Systems)
Centrifugal Pumps
Elevators
Gear Pumps
Inert Gas Systems
Oily Water Separators
Piston Pumps
Plate Type Heat Exchangers
Screw Pumps
Sewage Treatment Systems
Tube Type Heat Exchangers
CATEGORIES:
Deck Seal
BWTS (Ballast Water Treatment Systems)
Inert Gas Systems
PV Valves
Scrubber Towers (for tankers)