Ship Berth-Noise & Sea-Trial Corrective Action

01 · DECISION BOUNDARY

Keep every measured quantity on its own acceptance track.

A moored-ship airborne-noise survey can address port or environmental emission, source contribution and an agreed berth condition. A pre-delivery or sea-trial programme can coordinate several contractual measurements, but noise, habitability vibration, machinery vibration, HVAC, illumination and other disciplines retain their own methods, instruments, limits and acceptance owners.

State the vessel, decision, report recipient, procedure and edition, criterion, measurement quantity, units and authorised owner for each finding. Do not create one combined pass score that hides a failed discipline. The discontinued ESI Noise module must not be described as open for applications or incentives. Historic NEPTUNES terminology may still explain a method or client requirement, but current project applicability must be confirmed.

Blank decision and acceptance boundary
Finding	Discipline	Question	Quantity / units	Basis / edition	Acceptance owner	Excluded conclusion
DEC-01	___	___	___	___	___	___
DEC-02	___	___	___	___	___	___
DEC-03	___	___	___	___	___	___

02 · RELEASED BASELINE

Freeze the exact evidence that created the finding.

Retain the report revision, measured result, uncertainty or repeatability statement, criterion, margin, instrument and calibration chain, field checks, location geometry, weather or water condition, vessel operating state, witness record, raw-file references, processing configuration and every accepted deviation. Link the baseline to the earlier measurement evidence pack rather than recreating it from memory.

Identify whether the finding is a measured exceedance, an incomplete acceptance item, a repeatability concern, a diagnostic observation, a contract deviation or an information gap. A result that was never valid for the required decision should be remeasured before an expensive physical change is authorised. Preserve superseded reports and explain why they were superseded.

Blank baseline evidence freeze
Finding	Report / revision	Result / margin	Test condition	Uncertainty / limitation	Raw evidence	Reason for action
BASE-01	___	___	___	___	___	___
BASE-02	___	___	___	___	___	___
BASE-03	___	___	___	___	___	___

03 · CAUSE AND DISCRIMINATING TEST

Test the mechanism before selecting the remedy.

List plausible source, transmission, operating, installation, control, measurement and environmental causes. For berth noise this may include exhaust, ventilation outlets, pumps, generators, tonal equipment, loading activity, shore plant, reflections, weather or background contamination. For sea-trial findings it may include machinery alignment, mounting, propeller or shaft state, structural response, HVAC balance, control settings, workmanship, load, speed or an invalid plateau.

For each hypothesis, record the expected signature and a safe discriminating observation. Use synchronised operating logs, narrowband or order evidence, controlled equipment states, spatial comparisons, photographs, commissioning records or repeated plateaus as appropriate. Correlation is not automatically causation; state alternative explanations and the strength of evidence.

Blank cause-hypothesis and evidence matrix
Hypothesis	Expected signature	Controlled check	Observed evidence	Alternative cause	Confidence	Next decision
CAUSE-01	___	___	___	___	___	___
CAUSE-02	___	___	___	___	___	___
CAUSE-03	___	___	___	___	___	___

04 · BERTH-NOISE CORRECTIVE ACTION

Control the identified source without changing the declared test.

Potential actions may include maintenance, silencer or enclosure repair, resilient isolation, fan or outlet treatment, equipment sequencing, load management, temporary shore connection, operating restriction or a design modification. The appropriate designer, maker, owner, yard, port or other authorised party determines feasibility, safety and approval. A survey finding does not itself authorise machinery shutdown or modification.

Record the target source, predicted acoustic effect, operating consequence, affected ventilation or safety function, drawing or instruction, temporary versus permanent status and verification condition. If an operational measure is used, document who controls it and how the exact state will be reproduced. Do not claim source-power reduction from a boundary value unless the method supports that inference.

Blank moored-ship corrective-action gate
Action	Source / finding	Proposed control	Predicted effect	Operational risk	Authority / instruction	Verification state
BERTH-01	___	___	___	___	___	___
BERTH-02	___	___	___	___	___	___
BERTH-03	___	___	___	___	___	___

05 · SEA-TRIAL DEFICIENCY ACTION

Map each deficiency to the responsible system and plateau.

Record the affected discipline, space, equipment, speed, RPM, load, draught, trim, sea state, heading, HVAC or auxiliary configuration and specified plateau. Separate a physical deficiency from a data-quality or test-condition deficiency. A vibration finding may require alignment or structural diagnosis; a noise result may require source-path work; an HVAC or illumination deficiency needs its own competent technical route.

Define the authorised rectification, drawings or maker instruction, yard work order, inspection hold point, commissioning check and the precise plateau or operating state required for verification. Coordinate retesting efficiently, but never substitute one discipline’s spot check for another discipline’s full acceptance method.

Blank sea-trial deficiency and rectification register
Deficiency	Discipline / location	Baseline plateau	Rectification	Responsible party	Hold point	Retest requirement
TRIAL-01	___	___	___	___	___	___
TRIAL-02	___	___	___	___	___	___
TRIAL-03	___	___	___	___	___	___

06 · AUTHORISATION AND RISK GATE

Distinguish recommendation, approval, installation and acceptance.

Identify who recommends the action, who owns the vessel risk, who approves drawings or procedures, who performs the work, who witnesses commissioning, who reviews the measurement and who accepts contractual closure. These can be different people and organisations. Record actual involvement only; do not imply class, flag, port, client or maker endorsement from a generic reference.

Before work, address isolation, hot work, enclosed-space, work-at-height, overspeed, blackout, ventilation, machinery guarding, navigation and environmental controls as applicable. If the proposed action changes statutory, classed or safety-critical equipment, obtain the required authorised review before implementation.

Blank authority and risk gate
Action	Recommendation owner	Risk owner	Approval route	Installer	Witness / reviewer	Acceptance owner
AUTH-01	___	___	___	___	___	___
AUTH-02	___	___	___	___	___	___
AUTH-03	___	___	___	___	___	___

No fabricated authority.

This blank structure contains no completed vessel result, customer identity, ESI application, incentive, class or flag approval, external review, acceptance, outreach, backlink or testimonial.

07 · INSTALLED CONFIGURATION

Record what changed before measuring again.

Retain the approved instruction, drawing revision, component identity, location, material or setting, installer, date, photographs where permitted, quality checks, commissioning observations and deviations from the proposed action. For maintenance, record cleaned, repaired, replaced or adjusted items. For operational controls, retain the issued procedure, briefing, effective date and responsible watch or department.

If the executed state differs from the proposal, reassess the predicted effect and retest plan. Several simultaneous changes weaken attribution; report that limitation instead of assigning the full improvement to one measure. Raw baseline data must remain immutable, while any reprocessing is versioned and reproducible.

Blank installed-change evidence register
Action	Approved reference	Executed state	Deviation	Completion evidence	Commissioning check	Configuration owner
IMP-01	___	___	___	___	___	___
IMP-02	___	___	___	___	___	___
IMP-03	___	___	___	___	___	___

08 · MATCHED RETEST

Quantify comparability before interpreting improvement.

For berth noise, compare berth and vessel position, source-receiver geometry, operating equipment, load, doors and openings, cargo activity, shore sources, background, wind direction and speed, precipitation, temperature and instrument chain. For sea-trial work, compare discipline-specific locations, draught, trim, speed through water, RPM, pitch, load, sea state, heading, stabilisation, auxiliaries, instrument settings and processing.

Repeat the points and duration required by the governing procedure, not only the location expected to improve. State measurement uncertainty, repeatability and material condition differences. A lower value in calmer weather or at reduced load may not verify the action. Classify insufficiently matched evidence as limited or not verified.

Blank matched baseline-to-retest comparison
Item	Baseline state	Retest state	Difference	Measured change	Uncertainty / repeatability	Verification decision
RET-01	___	___	___	___	___	___
RET-02	___	___	___	___	___	___
RET-03	___	___	___	___	___	___

09 · CLOSE-OUT AND REPORT RELEASE

Close findings individually and preserve residual risk.

The close-out report should connect baseline, cause evidence, authorisation, installed state and retest result. Include procedure and edition, instruments, calibration, test conditions, raw-file references, calculations, uncertainty, deviations, witness records and limitations. Separate measured facts, calculated outputs, engineering interpretation and acceptance decisions.

Classify each item as verified for the tested condition, verified with limitation, partially verified, not verified, not tested, superseded or awaiting acceptance. Record remaining actions and owner. Vessel Doctor can report technical evidence but does not claim acceptance by a class society, flag, port, yard or client unless a traceable decision from that party exists.

Blank finding close-out and release register
Finding	Verification state	Retest reference	Residual limitation	Follow-up owner	Acceptance owner	Release revision
CLOSE-01	___	___	___	___	___	___
CLOSE-02	___	___	___	___	___	___
CLOSE-03	___	___	___	___	___	___

10 · CURRENT PRIMARY SOURCES

Confirm the current project basis.

Environmental Ship Index states that the Noise module is discontinued and new applications are no longer accepted.
ISO 2922:2020 addresses reproducible airborne sound measurement from vessels in ports and harbours.
ISO 19019:2005 gives basic instructions for planning, conducting and reporting contract-identified sea trials.
ISO 2923:1996 addresses onboard vessel noise measurement conditions and techniques.
ISO 20283-5:2016 covers ship vibration measurement, evaluation and reporting for habitability.

These sources provide method context. They do not replace the current contract, approved specification, flag instruction, class rule, port requirement, safe procedure or vessel-specific acceptance decision.

NEXT STEP

Send the released finding and executed change.

Provide the baseline report, applicable criterion, operating state, cause evidence, approved instruction, installed configuration and required acceptance route so a comparable retest can be planned.

Request a corrective-action retest scope Review berth-noise surveys Review sea-trial measurements

Ship Berth-Noise and Sea-Trial Corrective-Action and Retest Record