Vessel Operations — Operational Requirements

Draft Medium Research 4,538 words Created Mar 4, 2026

Vessel Operations — Operational Requirements for The Claw

A converted Aframax tanker operating as a mobile plasma processing vessel in the Great Pacific Garbage Patch (GPGP), ~1,000nm from Honolulu. This document covers the full operational picture: power, cycles, weather, crew, maintenance, safety, and annual costs.

1. Power Budget

Vessel Baseline

A standard Aframax tanker has:

Main engine: 11-14 MW (single slow-speed diesel)
Auxiliary generators: Typically 3x diesel generators, 1.5-2.5 MW each (4.5-7.5 MW total installed)
Emergency generator: 500-750 kW

For The Claw, the main propulsion engine is retained for transit. The conversion adds plasma processing equipment, syngas engines, and collection gear. The auxiliary power plant is significantly upgraded or replaced.

Power Demand by Mode

Transit Mode (Honolulu <-> GPGP)

System	Power Draw	Notes
Main engine (propulsion)	11-14 MW	Full ahead, 14-15 knots
Navigation & comms	50 kW	Radar, GMDSS, satcom
Hotel load	400-600 kW	Crew of 25, HVAC, lighting, galley
Steering gear	100-150 kW
Total transit	~12-15 MW	All diesel, no syngas generation

Fuel consumption in transit: ~45-55 tonnes/day of heavy fuel oil (HFO) or marine diesel oil (MDO) at 14-15 knots. At 1,000nm each way and ~15 knots, transit is ~67 hours (~3 days) each direction. Round trip burns ~270-330 tonnes of fuel.

Sources: Aframax specifications via Wikipedia, Wartsila tanker design data

Processing Mode (On Station, Full Operations)

System	Power Draw	Notes
Plasma reactor	800-1,200 kW	PyroGenesis PRRS at 5-10 TPD. Torch consumption ~0.8 MWh/ton at 10 TPD scale
Syngas cleanup & conditioning	150-300 kW	Scrubbers, coolers, filters, compressors
Shredder / pre-processing	200-400 kW	Size reduction, dewatering, sorting
Collection equipment	300-500 kW	Conveyor booms, winches, pumps, nets handling
Syngas engine/genset	-1,500 to -3,000 kW	Generation — syngas converted to electricity
Hotel load	400-600 kW	Full crew operations
Water maker (RO desalination)	50-80 kW	10-15 m3/day capacity
HVAC	150-250 kW	Tropical Pacific, full crew
Lighting & galley	80-120 kW	24-hour operations
Station-keeping (see below)	500-1,500 kW	If DP; near-zero if drift mode
Gross demand	~2,700-5,000 kW	Excluding syngas generation
Syngas generation	1,500-3,000 kW	From processed plastic
Net from diesel	~0-2,500 kW	Depends on throughput and DP mode

Critical note: The energy loop math (detailed in energy-balance.md) suggests syngas from 5-10 TPD of plastic can generate 4-9 MWh/day net after powering the torch. At processing rates toward 10 TPD, syngas should cover most or all processing + hotel load. Below ~5 TPD, diesel backup is needed.

Sources: PyroGenesis PRRS specs via pyrogenesis.com, plasma energy balance via NETL, syngas energy output ~815-900 kWh/ton via Science Council for Global Initiatives

Station-Keeping

Two options:

Mode	Power Draw	Accuracy	Cost	Recommendation
Dynamic Positioning (DP1/DP2)	500-1,500 kW continuous	Within 10m	High fuel burn, high maintenance on thrusters	Overkill for plastic collection
Drift mode with periodic repositioning	Near-zero (occasional thruster use)	Drifts with current	Minimal fuel	Recommended

The GPGP is within the North Pacific Subtropical Gyre where currents are slow (0.1-0.3 knots). Plastic accumulates precisely because the water is relatively calm. Drift mode is the correct choice — the vessel drifts with the same currents that concentrate the plastic, repositioning with main engine or bow thruster only when needed to move to higher-density areas.

DP2 (redundant dynamic positioning) would be required if the vessel were holding station near a fixed structure (pipeline, wellhead). For plastic collection in open water with no collision risk, DP is unnecessary cost and fuel burn.

Sources: DP system overview via Kongsberg Maritime, Seavium DP guidance-for-your-offshore-operation)

Hotel Load Only (Standby / Weather Hold)

System	Power Draw	Notes
HVAC	150-250 kW	Cannot shut down in tropics
Lighting	30-50 kW	Reduced to essential
Galley	30-50 kW	Crew still needs to eat
Water maker	50-80 kW	Continuous freshwater production
Navigation & comms	50 kW	Radar, AIS, satcom always on
Bilge/ballast pumps	20-40 kW	Intermittent
Medical bay	5-10 kW	Standby
Total hotel only	~350-530 kW	Single diesel generator

This is the weather-hold or maintenance mode. One auxiliary diesel generator covers it comfortably.

Source: Offshore vessel hotel load data via ScienceDirect, Marine Insight

Emergency / Backup Power

Requirement	Capacity	Notes
Emergency generator	500-750 kW	SOLAS requirement, auto-start within 45 seconds
UPS for critical systems	50 kW	Navigation, comms, fire detection
Emergency lighting	10 kW	18-hour battery backup per SOLAS
Diesel fuel reserve	30-day minimum	For transit home if syngas system fails completely

Diesel backup sizing: Even if the syngas system fails completely, the vessel must be able to run hotel load on diesel (~500 kW) for up to 30 days, plus transit home (~3 days at full power). This means carrying approximately 400-500 tonnes of diesel fuel as operational reserve, plus enough for the return transit.

Total Installed Power Summary

Source	Capacity	Role
Main diesel engine	11-14 MW	Propulsion (transit only)
Syngas engine/genset(s)	2-3 MW	Primary on-station power
Auxiliary diesel generators	3x 1.5-2 MW (4.5-6 MW)	Backup, transit aux, supplement
Emergency diesel generator	750 kW	SOLAS emergency power
Total installed	~18-24 MW

2. Operating Cycle — The 28-Day Rotation

Cycle Breakdown

Phase	Days	Activity
Transit out	3	Honolulu to GPGP at 14-15 knots
Processing operations	18-20	Collection + plasma processing
Scheduled maintenance	2-3	Electrode replacement, equipment checks, repairs
Weather downtime	2-4	Built into processing days (estimated)
Transit return	3	GPGP to Honolulu
Port / crew change	1-2	In Honolulu (overlaps with next cycle crew)
Total cycle	~28 days

Realistic Processing Uptime

Of the ~20 days on station:

Weather downtime: 2-4 days (sea state too high for collection; see Section 3). Processing MAY continue if feedstock buffer is loaded, but collection stops.
Maintenance: 1-2 days for plasma torch electrode swaps and equipment inspections
Net collection days: ~14-18 days
Net processing days: ~16-20 days (processing can continue from buffer stock during collection downtime)

Feedstock buffer strategy: Maintain a 2-3 day buffer of shredded, dewatered plastic in storage hoppers. This allows the plasma reactor to continue operating during short weather holds when collection is paused. Buffer capacity needed: ~15-30 tonnes (2-3 days at 5-10 TPD).

Crew Changeover

The changeover happens in Honolulu. The incoming crew flies commercial to Honolulu and boards while the outgoing crew departs. This is a hot swap — the vessel does not shut down systems. Key officers overlap for 4-8 hours for handover briefings.

Industry standard for remote offshore: 28/28 (equal time on/off) is standard for drilling and remote FPSO operations. Some operations use 28/14 (28 on, 14 off) to reduce crew costs, but 28/28 is better for retention and fatigue management at this distance.

Source: Offshore rotation standards via WTS Energy, Worldwide Recruitment Solutions

Supply Vessel Schedule

A dedicated supply run is needed once per cycle (every 28 days), plus the vessel carries supplies during its own transit.

What must be delivered (cannot generate on board):

Fresh food and provisions (frozen/dry stores for 28 days loaded in port; fresh provisions via supply vessel at ~day 14)
Diesel fuel (if burn rate exceeds carried reserves)
Plasma torch electrodes and consumables
Medical supplies and pharmaceuticals
Spare parts (pre-positioned based on maintenance schedule)
Potable water chemicals (RO membrane treatment)
PPE, cleaning supplies, operational consumables

What IS generated on board:

Freshwater (RO desalination — 10-15 m3/day for crew of 25)
Electricity (syngas + diesel)
Vitrified slag (byproduct, inert — stored or dumped per permit)
Metal ingots (from inorganic fraction — stored for port offload)

Maintenance Windows

During each 28-day cycle:

Daily: Equipment inspections, greasing, filter checks (1-2 hours)
Weekly: Comprehensive equipment inspection, fluid sampling (4-8 hours)
Per cycle: Plasma torch electrode inspection/replacement (8-16 hours downtime)
Per cycle: Collection equipment inspection, net/boom repair (4-8 hours)

During port calls:

Stores loading (8-12 hours)
Slag/metal offload (4-8 hours)
Shore-side specialist maintenance if needed
Crew medical checks

Bad Weather Protocol

Sea State	Hs (Sig. Wave Height)	Collection	Processing	Transit
0-3 (calm to slight)	0-1.25m	Full ops	Full ops	Full speed
4 (moderate)	1.25-2.5m	Full ops	Full ops	Full speed
5 (rough)	2.5-4.0m	Reduced/stopped	Continue from buffer	Full speed
6 (very rough)	4.0-6.0m	Stopped	Continue if safe	Reduced speed
7+ (high+)	6.0m+	Stopped	Shutdown & secure	Weather routing

Key principle: Collection is the weather-sensitive bottleneck. The plasma reactor, being internal, can operate in higher sea states than the collection equipment. The feedstock buffer bridges the gap.

3. Weather & Sea State — GPGP Conditions

Location

The GPGP is centered roughly at 25-35N, 135-155W, within the North Pacific Subtropical Gyre. This is the convergence zone of the North Pacific Current, the California Current, the North Equatorial Current, and the Kuroshio Extension.

Annual Wave Climate (Estimated from WAVEWATCH III Hindcast Data)

Month	Avg Hs (m)	Max Hs (m)	Avg Wind (knots)	Notes
Jan	2.5-3.5	6-10	15-25	Winter storms — worst month
Feb	2.5-3.5	6-9	15-25	Winter storm tracks active
Mar	2.0-3.0	5-8	12-22	Improving
Apr	1.5-2.5	4-6	10-18	Transition to calm season
May	1.5-2.0	3-5	8-15	Good operating window opens
Jun	1.0-2.0	3-5	8-15	Prime season
Jul	1.0-1.5	2-4	8-12	Prime season — calmest
Aug	1.0-1.5	2-4	8-12	Prime season — calmest
Sep	1.0-2.0	3-5	8-15	Good, but hurricane risk
Oct	1.5-2.5	4-7	10-18	Transition to winter
Nov	2.0-3.0	5-8	12-22	Winter storm tracks return
Dec	2.5-3.5	6-10	15-25	Winter storms — bad

Note: These are estimates derived from North Pacific wave climate literature and NOAA WAVEWATCH III model outputs. The GPGP sits in the subtropical high, which is calmer than the storm track to the north (40N+) but still gets long-period swell from distant storms. Actual conditions vary year to year, especially with El Nino / La Nina cycles.

Sources: NOAA high seas forecast products, Copernicus satellite altimetry data, Colosi et al. 2021 — seasonal wave height cycles

Operational Season

There IS a season. The Ocean Cleanup pauses GPGP operations for winter (roughly November-March) because harsh winter conditions reduce collection efficiency and increase equipment damage risk.

Season	Months	Viability
Prime	Jun-Sep	80-90% collection uptime. Calm seas, light winds. Best plastic concentration (less wind-driven submersion).
Shoulder	Apr-May, Oct	60-75% collection uptime. Occasional weather holds.
Winter	Nov-Mar	40-60% collection uptime. Frequent storm interruptions. Processing can continue from buffer but collection is unreliable.

Recommendation: Operate year-round but plan for reduced throughput in winter. Alternatively, use winter months for dry dock / major maintenance. The Ocean Cleanup returns to port for winter — a mobile processing vessel could do the same, scheduling the 5-year survey and major refits for November-February.

Sources: The Ocean Cleanup — System 002 seasonal operations, Ocean Cleanup — GPGP overview

Storm Frequency

The GPGP area (25-35N) is south of the main North Pacific storm track (which runs 40-50N). Direct hits from extratropical storms are rare in summer, more common in winter when the storm track dips south. Tropical cyclone (hurricane) risk exists June-November but the central Pacific rarely sees direct landfalls at this latitude.

Expected weather downtime: ~15-25% of on-station time annually (higher in winter, lower in summer).

Currents

Surface currents in the GPGP are typically 0.1-0.3 knots. This is the gyre's center — water moves slowly, which is why plastic accumulates. This is favorable for drift-mode station-keeping.

4. Crew & Logistics

Crew Composition

Total crew: 24-28 per rotation (two full crews needed for 28/28 rotation)

Role	Count	Notes
Master (Captain)	1	Unlimited Master license, STCW certified
Chief Officer	1	Navigation, cargo/collection ops, safety officer
2nd Officer	1	Navigation watch, collection operations
3rd Officer	1	Navigation watch, environmental monitoring
Chief Engineer	1	Overall engineering, plasma system oversight
2nd Engineer	1	Syngas engine, power plant
3rd Engineer	1	Auxiliary systems, water maker, HVAC
Electrician / ETO	1	Electrical systems, PLC, automation
Plasma Operations Lead	1	PyroGenesis-trained, reactor operations
Plasma Operator	2	24-hour reactor watch coverage (with lead = 3 total)
Collection Operations Lead	1	Boom/net deployment, deck operations
Deck crew (ABs)	4	Collection equipment, deck maintenance, mooring
Bosun	1	Deck maintenance, rigging, seamanship
Motorman / Oiler	2	Engine room watch, mechanical maintenance
Medic / Paramedic	1	Advanced first aid, telemedicine, pharmacy
Cook / Steward	2	Galley, provisions, housekeeping
Environmental Officer	1	Emissions monitoring, waste tracking, regulatory compliance
Total	~24-26

Key considerations:

Plasma operators are specialized — they need PyroGenesis training. Cannot be filled from general maritime crew pool.
24-hour operations require 3-watch rotation for bridge, engine room, and plasma operations.
No helicopter crew — helicopter is not based on board (see below).

Sources: Maritime salary guide 2026, Crewlinker offshore vessel jobs

Rotation Model

Recommended: 28/28 (28 days on, 28 days off)

This is industry standard for remote offshore operations (drilling rigs, FPSOs far from shore). The key reasons:

Fatigue management: MLC 2006 and STCW mandate minimum rest hours. 28/28 prevents cumulative fatigue.
Crew retention: At 1,000nm from port, morale matters. Equal time on/off is the industry norm for remote work.
Total crew required: 2 full crews x 25 = 50 personnel on payroll (one crew on board, one crew on leave).
Travel: Crew flies commercial to/from Honolulu. The vessel transits to port for changeover.

Some FPSO operations in West Africa use 28/14 for cost savings (28 on, 14 off), but this requires a larger crew pool and leads to higher turnover.

Source: WTS Energy — 28/28 rotation

Helicopter Logistics

1,000nm is beyond the range of ANY offshore helicopter.

Helicopter	Max Range	Notes
Sikorsky S-92	539nm	Most common offshore transport
AW139	306nm	Medium twin
AW169	440nm	Medium twin

At 1,000nm from Honolulu, helicopter crew transfer is not possible. Even the longest-range offshore helicopter (S-92) can only reach ~500nm, and that is one-way with no reserve fuel — operationally impossible.

Options for emergency medical evacuation: 1. USCG C-130 fixed-wing + rescue helicopter relay — USCG can deploy a C-130 from Barbers Point, HI to provide on-scene coordination and drop supplies. Rescue helicopter can be deployed from a USCG cutter if one is within range. 2. Vessel transit to meet helicopter — Steam toward Honolulu at 15 knots while helicopter flies out. Rendezvous at ~500nm from shore (~33 hours sailing + helicopter flight). 3. Medevac to passing vessel — Transfer patient to a faster vessel heading to port. 4. US Navy assets — Pearl Harbor is the closest major naval base. Navy can deploy long-range assets for life-threatening emergencies.

Cost: No helicopter operating budget needed for routine crew transfer (crew transfers happen in port). Emergency medevac would be a USCG operation (no direct cost, but insurance must cover it).

Sources: Fair Lifts — offshore helicopter guide

Supply Vessel Logistics

Frequency: Once per 28-day cycle (mid-cycle resupply of fresh provisions, mail, critical spares)

Supply vessel type: Platform Supply Vessel (PSV), ~60-80m, hired on spot or short-term charter from Honolulu.

Round trip for supply vessel: 1,000nm each way at 12 knots = ~83 hours each way = ~7 days round trip. This is expensive — the supply vessel is committed for a full week per delivery.

Item	Cost Estimate	Notes
PSV charter	$30,000-45,000/day	Pacific rates; spot market data
7-day round trip	$210,000-315,000	Per supply run
Fuel for PSV	~$50,000-80,000	7 days steaming, 15-20 tonnes/day
Per-cycle supply cost	~$260,000-400,000	Charter + fuel
Annual (13 cycles)	~$3.4M-5.2M	Estimate

Alternative: Reduce supply runs by carrying more stores during the vessel's own port call at each crew change. If the vessel loads 28 days of everything in port, mid-cycle supply runs may be needed only for urgent/unplanned items (every other cycle instead of every cycle).

Medical Capability

At 1,000nm from the nearest hospital (Queen's Medical Center, Honolulu), the vessel is 24-48+ hours from shore medical care even at full speed.

Required medical capability (per STCW, MLC 2006, and flag state requirements):

Capability	Details
Medical officer	Paramedic or advanced EMT minimum; offshore medic certification required
Ship's hospital	Dedicated medical bay with examination table, monitoring equipment
Pharmacy	Category A medicine chest (highest category for vessels >3 days from port)
Telemedicine	24/7 satellite link to shore-based physician (companies like MSOS, MedAire)
Surgical capability	Limited — stabilization and suturing. No major surgery.
Defibrillator	AED + manual defibrillator
Oxygen	Therapeutic oxygen supply, minimum 48 hours
Stretcher / basket	For helicopter hoist extraction if USCG reaches vessel
Dental emergency kit	Basic extraction and pain management

The reality: At this distance, the medical strategy is stabilize and evacuate. Serious trauma, heart attack, stroke, or appendicitis requires getting the patient to shore ASAP. The vessel can steam toward Honolulu while coordinating USCG medevac.

Sources: STCW medical care requirements, MLC 2006 Regulation 4.1, MSOS offshore medical support

Communication Systems

System	Purpose	Redundancy
VSAT (Ku/Ka-band)	Primary data, voice, telemedicine, weather	Primary
Inmarsat Fleet Broadband	Backup data, voice	Secondary
Iridium satellite phone	Emergency voice, low-bandwidth data	Tertiary
GMDSS (MF/HF/VHF)	Distress, SAR coordination, weather	SOLAS required
EPIRB	Emergency position beacon	SOLAS required
SART	Search and rescue transponder	SOLAS required
AIS	Vessel tracking	SOLAS required

Monthly satcom cost: $5,000-15,000 depending on bandwidth tier. Telemedicine requires reliable video capability.

5. Maintenance & Reliability

Plasma Torch Electrode Replacement

Component	Life Expectancy	Replacement Time	Cost per Unit	Notes
Graphite electrodes	200-1,000 hours	4-8 hours	$2,000-10,000	Varies by torch design and operating power. Consumption is fastest at start and end of electrode life.
Refractory lining	6-12 months	24-48 hours (major maintenance)	$20,000-50,000	Requires reactor cooldown
Syngas filters / scrubbers	500-2,000 hours	2-4 hours	$1,000-5,000
Torch nozzle	~500 hours	2-4 hours	$1,000-3,000

At 10 TPD, 24-hour operation: The reactor runs ~480 hours per cycle (20 days on station). Electrode replacement is needed at least once per cycle, possibly twice. Carry minimum 4 sets of electrodes per cycle.

Sources: PyroGenesis PRRS, Plasma torch electrode life data, PyroGenesis technical papers

Planned Maintenance Schedule

Interval	Systems	Duration
Daily	Equipment rounds, oil checks, filter inspections	1-2 hours
Weekly	Fluid sampling, belt/chain inspection, greasing	4-8 hours
Per cycle (28 days)	Electrode swap, collection gear inspection, safety equipment checks	8-16 hours
Quarterly	Main engine governor, alternator checks, safety valve testing, lifeboat service	24-48 hours (in port)
Annual	Underwater hull inspection (divers or ROV), classification society survey items, safety equipment recertification	5-7 days (in port)
2.5 years	Intermediate survey / docking survey	7-14 days dry dock
5 years	Special survey (full dry dock)	3-6 weeks dry dock

Critical Spares Inventory

Must carry on board at all times:

Category	Items	Estimated Value
Plasma system	4x electrode sets, 2x nozzles, 2x igniter assemblies, refractory patch kit	$80,000-120,000
Syngas engine	Injector set, turbocharger cartridge, fuel pump, gaskets	$40,000-60,000
Diesel generators	Injector set, fuel pump, governor actuator, filters (6-month supply)	$30,000-50,000
Collection equipment	Spare conveyor belts, hydraulic hoses, winch motor, boom cylinder seals	$20,000-40,000
Electrical	Spare PLC module, VFD, contactors, fuses, cable	$15,000-25,000
Hull/marine	Pump impellers, valve internals, shaft seals, RO membranes	$20,000-30,000
Safety	SCBA bottles, fire hose, extinguisher charges	$5,000-10,000
Total spares inventory		$210,000-335,000

Dry Dock

Event	Frequency	Duration	Estimated Cost
Intermediate survey	Every 2.5 years	7-14 days	$800K-1.2M
Special survey	Every 5 years	3-6 weeks	$1.2M-1.6M
Location	Honolulu (limited capacity) or US West Coast (LA, San Francisco, Portland, Seattle)

Tanker vessels cannot apply for extended dry docking under current classification rules — The Claw must follow the standard schedule.

Sources: Marine Insight — dry dock cost estimation, ResearchGate — tanker dry docking cost modeling

At-Sea Repair Capability

The engineering team (Chief Engineer + 2nd + 3rd + ETO + 2 motormen) must be capable of:

Plasma electrode replacement without shore support
Diesel generator overhaul (top-end)
Hydraulic system repair (collection equipment)
Electrical fault-finding and motor replacement
Welding and fabrication (dedicated workshop on board)
Basic hull patching (above waterline)

What cannot be repaired at sea:

Main engine crankshaft / bottom-end failure (tow to port)
Propeller / shaft damage (tow to port)
Major structural damage (emergency response)
Reactor refractory rebuild (port-side maintenance)

6. Safety & Emergency

Emergency Response at 1,000nm

Agency	Capability	Response Time
USCG District 14 (Honolulu)	C-130 Hercules (airborne SAR coordination, supply drop)	4-6 hours
USCG cutter	If one is in area — medical, firefighting, tow	Variable (hours to days)
US Navy (Pearl Harbor)	Long-range assets for major emergency	12-48 hours
Commercial vessels	AMVER system — nearby merchant ships can divert	Variable
Self-rescue	Lifeboats, life rafts, EPIRB, SART	Immediate

Reality check: At 1,000nm from shore, the vessel is largely on its own for the first 4-6 hours minimum. Self-sufficiency in firefighting, flooding, and medical emergencies is essential.

Firefighting for Plasma Operations

Plasma gasification involves:

Temperatures exceeding 3,000C in the plasma arc
Syngas (hydrogen + carbon monoxide — flammable and toxic)
Molten slag at 1,400-1,600C

System	Coverage
Fixed CO2 flooding	Reactor compartment, syngas piping area
Water mist / deluge	Reactor room, engine room
Foam system	Fuel storage areas, deck
Portable extinguishers	Throughout vessel
Fire detection	Flame detectors, smoke detectors, gas detectors (H2, CO) in all processing spaces
Gas-free ventilation	Forced ventilation with gas monitoring in all confined spaces
Emergency shutdown (ESD)	One-button reactor shutdown, syngas system isolation

Syngas-specific hazards: CO is odorless and lethal. H2 is explosive in air at 4-75% concentration. Fixed gas detection with automatic ventilation and alarm is mandatory in all spaces where syngas is present.

Evacuation Procedures

Scenario	Response
Abandon ship	2x enclosed lifeboats (capacity: 100% crew each side), life rafts, immersion suits
Man overboard	MOB procedures, fast rescue craft, dan buoy, EPIRB-equipped life ring
Medical evacuation	Steam toward shore + USCG C-130 coordination for helicopter rendezvous at ~500nm
Fire / explosion	Muster, boundary cooling, fight fire. If uncontrollable, prepare to abandon.

Environmental Spill Response

Risk	Mitigation
Diesel fuel spill	SOPEP (Shipboard Oil Pollution Emergency Plan), absorbent booms, dispersant
Slag / residue overboard	Slag is vitrified (inert glass-like solid) — minimal environmental risk, but still regulated
Syngas release	Lighter than air, disperses rapidly. Toxic if inhaled. Gas detection + forced ventilation
Collected plastic loss	Re-release of collected plastic overboard during storm — net/containment system design must prevent this
Hydraulic oil	Biodegradable hydraulic fluid for deck equipment where possible

MARPOL compliance: The vessel must meet MARPOL Annex I-VI requirements. Plasma processing emissions need to meet applicable air quality standards (MARPOL Annex VI, possibly EPA requirements given US flag/port).

Coast Guard / SAR Coordination

File voyage plans with USCG before each transit
Maintain AMVER (Automated Mutual-Assistance Vessel Rescue System) reporting
Daily position reports via Inmarsat
USCG District 14 duty officer contact maintained at all times
Nearest USCG cutter position tracked (USCG publishes positions for SAR planning)

7. Annual Operating Cost Model (OPEX)

Assumptions

10-12 operating cycles per year (2-3 cycles lost to dry dock, major maintenance, or winter weather stand-down)
28/28 crew rotation, 2 full crews
Honolulu as home port
Vessel is owned (not chartered) — no charter/lease cost in OPEX
All figures in USD, 2025 estimates

Crew Costs

Role	Annual Salary (per person)	Headcount (x2 crews)	Annual Cost
Master	$160,000-200,000	2	$320,000-400,000
Chief Officer	$120,000-150,000	2	$240,000-300,000
2nd Officer	$90,000-110,000	2	$180,000-220,000
3rd Officer	$80,000-100,000	2	$160,000-200,000
Chief Engineer	$150,000-180,000	2	$300,000-360,000
2nd Engineer	$110,000-140,000	2	$220,000-280,000
3rd Engineer	$85,000-105,000	2	$170,000-210,000
ETO / Electrician	$90,000-110,000	2	$180,000-220,000
Plasma Ops Lead	$120,000-150,000	2	$240,000-300,000
Plasma Operators (x2)	$80,000-100,000	4	$320,000-400,000
Collection Ops Lead	$90,000-110,000	2	$180,000-220,000
Bosun	$70,000-85,000	2	$140,000-170,000
ABs (x4)	$55,000-70,000	8	$440,000-560,000
Motormen (x2)	$60,000-75,000	4	$240,000-300,000
Medic	$90,000-120,000	2	$180,000-240,000
Cook/Steward (x2)	$50,000-65,000	4	$200,000-260,000
Environmental Officer	$85,000-110,000	2	$170,000-220,000
Subtotal salaries		50	$3,980,000-4,860,000
Benefits & insurance (30%)			$1,194,000-1,458,000
Rotation travel (flights to/from Honolulu)			$150,000-250,000
Total crew			$5,324,000-6,568,000

Sources: Maritime Salary Guide 2026, Securewest salary guide

Fuel

Item	Quantity	Cost
Transit fuel (HFO/MDO)	~300 tonnes x 10 round trips = 3,000 tonnes/year	$1,800,000-2,400,000
Backup diesel (on-station generator use)	~500-1,000 tonnes/year (depends on syngas reliability)	$300,000-600,000
Lubricating oil	~50 tonnes/year	$100,000-150,000
Total fuel		$2,200,000-3,150,000

Note: If syngas system achieves target reliability, on-station diesel backup drops significantly. First-year costs will be higher as the system is commissioned.

Consumables

Item	Annual Cost	Notes
Plasma torch electrodes	$100,000-200,000	~20 sets/year at $5,000-10,000 each
Refractory lining repairs	$50,000-100,000	Partial relining 1-2x/year
Syngas filters & catalysts	$30,000-60,000
RO membranes & chemicals	$15,000-30,000
Collection equipment wear parts	$50,000-100,000	Nets, booms, conveyor belts
Provisions (food & stores)	$200,000-300,000	50 crew-months on board per year
PPE & safety consumables	$20,000-40,000
Total consumables		$465,000-830,000

Maintenance & Repair

Item	Annual Cost	Notes
Planned maintenance (routine)	$300,000-500,000	Parts, contractor support in port
Unplanned repairs	$200,000-400,000	Contingency — things break
Dry dock (annualized)	$400,000-600,000	$1.2M-1.6M every 2.5-5 years
Classification society fees	$50,000-80,000	Annual survey, flag state fees
Total maintenance		$950,000-1,580,000

Supply Vessel

Item	Annual Cost	Notes
Mid-cycle supply runs	$2,600,000-5,200,000	10 runs/year at $260K-520K each
Alternative (reduced runs)	$1,300,000-2,600,000	5 runs/year if heavy loading in port

This is one of the largest variable costs. Minimizing supply runs by maximizing stores at each port call is critical.

Insurance

Coverage	Annual Premium	Notes
Hull & Machinery (H&M)	$400,000-800,000	Based on ~$50-100M vessel value, 0.5-1.5% premium
P&I (Protection & Indemnity)	$200,000-400,000	Crew liability, pollution, third-party
Environmental liability	$100,000-300,000	Plasma operations add risk premium
Cargo/processing liability	$50,000-100,000	Unusual cargo = unusual coverage
War risk / piracy	$50,000-100,000	Low risk in GPGP area
Total insurance		$800,000-1,700,000

Note: This is a novel vessel class performing a novel operation. Underwriters will price uncertainty. First-year premiums may be higher until loss history is established. Estimates based on general FPSO and tanker insurance data.

Sources: Lloyd's List — vessel insurance

Helicopter Operations

$0 for routine operations — crew transfer happens in port. No ship-based helicopter.

Emergency medevac is covered by USCG (no direct cost) and insurance.

Port Fees & Shore Support

Item	Annual Cost	Notes
Honolulu port fees (berthing, pilotage, tugs)	$300,000-500,000	~10-12 port calls/year
Waste disposal (slag offload)	$50,000-100,000	Vitrified slag disposal or sale
Shore-based management office	$400,000-600,000	Operations manager, logistics coordinator, admin, office lease
Regulatory & compliance	$50,000-100,000	EPA, USCG, flag state, classification
Satellite communications	$100,000-180,000	VSAT + Inmarsat + Iridium
Telemedicine service	$30,000-50,000	24/7 physician access
Weather routing service	$20,000-40,000	Professional meteorological support
Total port & shore		$950,000-1,570,000

TOTAL ANNUAL OPEX SUMMARY

Category	Low Estimate	High Estimate
Crew costs	$5,324,000	$6,568,000
Fuel	$2,200,000	$3,150,000
Consumables	$465,000	$830,000
Maintenance & repair	$950,000	$1,580,000
Supply vessel	$1,300,000	$5,200,000
Insurance	$800,000	$1,700,000
Port fees & shore support	$950,000	$1,570,000
TOTAL ANNUAL OPEX	$11,989,000	$20,598,000

Rounded Estimate: $12M - $21M per year

Central estimate: ~$15-16M/year assuming moderate supply vessel frequency, reasonable syngas reliability, and no major unplanned events.

Cost per Tonne of Plastic Processed

Scenario	Annual Throughput	Annual OPEX	Cost per Tonne
Conservative (5 TPD, 200 processing days)	1,000 tonnes	$15M	$15,000/tonne
Target (7.5 TPD, 220 processing days)	1,650 tonnes	$15M	$9,100/tonne
Optimistic (10 TPD, 240 processing days)	2,400 tonnes	$16M	$6,700/tonne

For context: The Ocean Cleanup's cost per tonne is not publicly disclosed but is estimated at $5,000-20,000/tonne for collection alone (no processing). The Claw's cost includes full plasma destruction.

Key Uncertainties & Risks

Item	Impact	Confidence
Syngas energy recovery rate	Determines diesel backup needs — swings fuel budget by $500K+/year	MEDIUM — lab-proven, not field-proven on ocean plastic mix
Plasma system reliability at sea	Novel installation — first years may have more downtime	LOW — no precedent for shipboard plasma at this scale
Supply vessel costs	Largest variable OPEX item — charter rates volatile	MEDIUM — can be managed with better port logistics
Insurance premiums	Novel operation = uncertain underwriting	LOW — no loss history to anchor premiums
Crew retention for plasma ops	Specialized roles in remote location — recruitment challenge	MEDIUM — premium pay and 28/28 rotation help
Winter weather downtime	Could reduce annual throughput 20-30% vs. optimistic estimates	HIGH — well-documented seasonal patterns
Electrode consumption rate	Could be higher than lab data suggests due to salt contamination in feedstock	MEDIUM — saltwater residue on ocean plastic may accelerate electrode wear

Data Sources & Confidence Key

KNOWN: Published specifications, regulatory requirements, established industry data
ESTIMATED: Derived from analogous operations (FPSO, offshore drilling, tanker operations) with reasonable adjustments
SPECULATIVE: Novel aspects of this operation with no direct precedent — flagged explicitly

Most cost figures are ESTIMATED based on analogous offshore operations. The plasma-specific costs are the least certain, as shipboard plasma gasification at this scale has no operational precedent.

Last updated: 2026-03-04 Research compiled from public sources including PyroGenesis technical papers, NOAA oceanographic data, maritime industry publications, and offshore operations benchmarks.