Cargo containment, gas trials, cryogenic
Commissioning software for gas carriers where cargo containment has to be proven before anything else.
An LNG or LPG carrier newbuild stacks cargo containment, cargo handling, reliquefaction and gas fuel systems on top of a conventional hull and machinery scope, each with its own cryogenic and gas-safety test regime. Deskely holds cargo systems as their own subsystems with dependencies modelled against class and flag requirements, so gas trials are never the first place a gap is found.
- Systems
- Containment, handling, reliquefaction
- Regime
- Cryogenic and gas trials
- Code
- IGC / IGF
- Gate
- Gas trials and delivery
Choose your project type
The problem
Cargo systems are a ship inside the ship, with their own test regime.
Cargo containment, cargo pumps and compressors, reliquefaction plant, gas combustion units and gas fuel supply each carry cryogenic and gas-safety tests that conventional hull and machinery scopes never see.
These systems are commissioned by specialist subcontractors on a schedule that rarely matches the hull programme, and their evidence often lands as separate reports rather than as part of one register.
Deskely models cargo systems as subsystems in the same register as the rest of the vessel, so cool-down readiness and gas trial prerequisites are queries, not assumptions made under schedule pressure.
Setting up the register
Containment, handling and gas fuel are subsystems with class-linked record sets.
Cargo tanks, membrane or Moss systems, cargo and spray pumps, compressors, reliquefaction plant, vapour handling and gas fuel supply each hold their own equipment and record sets, cross-referenced to class and flag requirements.
General arrangements, cargo P&IDs and equipment lists are parsed into a reviewed register, so every valve, sensor and pump carries its drawing reference and its class notation.
That structure is what lets tank inerting, drying and cool-down proceed on a schedule the hull programme can plan around instead of chase.
Execution
Inerting, drying, cool-down and gas trials captured tank by tank, system by system.
Technicians and cargo system specialists sign inerting, drying, cool-down, gas-up and commissioning records on tablets at the tank and the equipment, including class witness points.
Punch is raised with photos and categorised by whether it blocks cool-down, gas trials or delivery, so cryogenic-critical items are never buried in a general list.
Progress rolls up per cargo system and per tank, which is the level the trials plan is actually managed at.
Gas trials and delivery
Gas trials sit on top of a chain of cryogenic and gas-safety evidence.
Gas trial readiness depends on cargo system mechanical completion, inerting and drying results, and class witnessing, each enforced as a prerequisite from the records beneath.
The dossier per cargo system gives class, owner and the operating crew the settings, test results and drawings they need before the vessel ever loads cargo.
Residual punch stays live through delivery with owners and dates instead of disappearing into a handover binder.
Membrane integrity and the first gas-free entry
A membrane or Moss tank cannot be re-opened once insulation is closed in, so the inspection before closure is the only chance to catch a flaw.
Membrane containment systems are inspected panel by panel — weld integrity, corrugation condition, insulation box fit and vapour barrier continuity — before the secondary barrier and insulation are closed in, because once the tank is dressed out those checks are no longer physically possible without major rework.
Nitrogen purging, tightness testing and the first gas-free entry each depend on that closure inspection being complete and signed, and a missed or unsigned panel found only during commissioning gas trials can mean opening up insulation that took weeks to install.
Deskely tracks membrane panel inspection as its own record set against the tank tag, gated ahead of insulation closure, so the yard closes each tank knowing every panel was actually inspected rather than assuming coverage from a sampling plan.
How it runs
From tank fabrication to a vessel proven on gas.
Gas carrier programmes punish weak sequencing between hull, cargo systems and class more than almost any other newbuild scope.
- 01
Model cargo subsystems
Containment, cargo handling, reliquefaction and gas fuel supply registered as their own subsystems.
- 02
Parse the equipment set
General arrangements, cargo P&IDs and equipment lists drafted into a reviewed tag register.
- 03
Link class and flag requirements
IGC/IGF code items and class notations recorded as prerequisites to system acceptance.
- 04
Give specialists scoped access
Cargo system contractors sign their own equipment while the yard sees one register.
- 05
Run inerting through gas-up
Drying, inerting, cool-down and gas-up recorded per tank with class witness points captured.
- 06
Accept for gas trials
System acceptance issued from signed records, feeding gas trial and delivery readiness.
FAQ
Questions about LNG and gas carriers scopes.
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