Header band, 2800 x 400 (7:1), WebP or JPG, under 160 KB. NOT A NEW PHOTOGRAPH: crop this band out of the middle of the same camera original as this discipline's portrait master, from the full-size file rather than the delivered 1200 x 1800 — the uploader refuses anything narrower than 1400 px. Flat exposure, nothing above 60% luminance, no lens flare, and the subject sitting in the middle third so the type above it has clean ground. NO LEGIBLE VESSEL NAME, IMO NUMBER OR CLIENT BRANDING.
ShipCertify calibrates shipboard measuring instruments against reference standards that carry their own calibration certificates, and issues a calibration certificate for each instrument naming the standard used and its certificate reference. We do not publish our own accreditation status on a marketing page; what is held for a quoted scope is stated in writing with the quotation. Pressure and temperature instruments, gas detection, tank gauging, loading computers, oil content meters and flow measurement. Work is done on board during the port call where the method allows it. Every certificate carries as-found and as-left values, the calibration points and the reference standard used.
The instruments that govern this work, cited as a superintendent would write them. What each one requires of the shipowner — not what we sell.
Ships carry an appropriate portable atmosphere testing instrument or instruments, capable as a minimum of measuring oxygen, flammable gases or vapours, hydrogen sulphide and carbon monoxide, before enclosed space entry. Suitable means shall be provided for the calibration of all such instruments.
Para. 7.2: the atmosphere is tested before any person enters and at regular intervals thereafter, with properly calibrated equipment, by persons trained in its use, manufacturers' instructions strictly followed. Para. 7.3: at least two sets of gas detection equipment, taking MSC.1/Circ.1477 into account. Para. 7.4 adds a carbon dioxide reading below 0.5% by volume. It replaces IMO Res. A.1050(27), which the 34th Assembly revoked in December 2025.
On ships of 400 gross tonnage and above, machinery-space bilge water passes through oil filtering equipment limiting the effluent to 15 ppm. On ships of 10,000 gross tonnage and above the equipment additionally carries alarm arrangements and an automatic stopping device. Oil tankers of 150 gross tonnage and above carry an approved oil discharge monitoring and control system.
Sets the specification and type-approval basis for 15 ppm oil filtering equipment and the 15 ppm bilge alarm. Under para. 4.2.11 as replaced by MEPC.285(70): the validity of calibration certificates is checked at IOPP annual, intermediate and renewal surveys; the accuracy of the alarm is checked by calibration and testing conducted by a manufacturer or persons authorised by the manufacturer, at intervals not exceeding five years after commissioning or within the term in the manufacturer's instructions, whichever is shorter; alternatively the unit is replaced by a calibrated 15 ppm bilge alarm, and the calibration certificate is retained on board.
Section 10 requires the company to establish procedures ensuring the ship is maintained in conformity with the relevant rules and regulations and with any additional requirements the company establishes, with inspections held at appropriate intervals, and to identify equipment and technical systems whose sudden operational failure may result in hazardous situations. Most instrument intervals come from here.
Requires nothing of the shipowner. It binds laboratories: metrological traceability, a calibration programme for their own reference equipment, stated measurement uncertainty, defined certificate content. Accreditation to it is granted by a national accreditation body against a published scope that names the quantities, the ranges and the measurement capability covered, and it is that body's register — not a supplier's website — that settles who holds what. It is listed here because your surveyor may ask about it, not as a statement about us: we do not publish our own accreditation status on a marketing page. Whatever is held for a quoted scope is stated in writing with the quotation.
What is due, how often, and which instrument sets the period. Where an interval comes from the manufacturer or from class rather than from an IMO instrument, the table says so.
| Item | Interval | Set by | Note |
|---|---|---|---|
| Portable atmosphere testing instruments — enclosed space entry | Per manufacturer's schedule — commonly 6 or 12 months | Manufacturer's instructions. SOLAS Reg. XI-1/7 requires the instrument and requires suitable means for its calibration to be provided; it sets no interval. IMO Res. MSC.581(110) para. 7.2 recommends testing with properly calibrated equipment and that the manufacturers' instructions be strictly followed. | Oxygen, flammable gases or vapours, hydrogen sulphide and carbon monoxide as a minimum, in one instrument or several |
| Bump and response test, portable gas detectors | Before each use | Manufacturer's instructions and the vessel's SMS under the ISM Code | A bump test proves response, not accuracy. It is not a calibration |
| Calibration gas — cylinder shelf life | Per the cylinder's own expiry date | Gas manufacturer's certificate of analysis. Reactive mixtures — hydrogen sulphide in particular — carry a shorter shelf life than oxygen or methane mixtures. | Expired gas invalidates the span; the cylinder is named on the certificate with batch number and expiry date |
| Fixed gas detection and sampling systems | Per manufacturer's schedule | Manufacturer's instructions and the vessel's planned maintenance system under the ISM Code. No IMO instrument fixes an interval. | Sample lines and the alarm chain proved end to end |
| Pressure, vacuum and temperature instruments | Per PMS or class survey cycle | The vessel's SMS under the ISM Code, and classification society rules where the instrument forms part of a class-surveyed system | No IMO instrument sets a calibration interval for these |
| Tank gauging systems, UTI tapes, level instruments | Per manufacturer's schedule — commonly 12 months for UTI tapes | Manufacturer's instructions; classification society rules for the gauging installation | Inspectors and terminals read the date on the certificate and on the tape's label; both must agree |
| Loading computer and stability instrument verification | Annual | Classification society rules — check against the approved test conditions at each annual survey | Repeat after any software or approved-condition change |
| Oil content meter — 15 ppm bilge alarm | At intervals not exceeding 5 years after commissioning, or the term stated in the manufacturer's instructions, whichever is shorter | IMO Res. MEPC.107(49) para. 4.2.11, as replaced by MEPC.285(70). The accuracy check is by calibration and testing conducted by a manufacturer or persons authorised by the manufacturer; alternatively the unit is replaced by a calibrated one. | Certificate validity is checked at IOPP annual, intermediate and renewal surveys; the certificate is retained on board |
| ODME — oil discharge monitoring and control | Accuracy verified at each IOPP Certificate renewal survey — 5 years maximum | IMO Res. MEPC.108(49), as amended by MEPC.240(65), para. 5.3 — which applies to ODMEs installed in oil tankers whose keels were laid on or after 1 January 2005; equipment on earlier tankers may instead sit under A.393(X), A.496(XII), MEPC.13(19) or A.586(14). MARPOL Annex I Reg. 31 requires the system on oil tankers of 150 gross tonnage and above; the manufacturer's instructions govern any shorter interval. | Calibration certificate showing the date of the last calibration check retained on board |
| Flow meters and bunker measurement equipment | Per manufacturer's schedule | Manufacturer's instructions. Some ports impose their own verification regime under national metrology law. | MARPOL Annex VI requires bunker delivery notes, not meter calibration |
| Torque wrenches — hand torque tools | 12 months or 5,000 cycles, whichever occurs first | ISO 6789-2:2017 clause 4.1 — a default that applies where the user operates no control procedure; where one exists, the interval is set from the tool's conditions of use. ISO 6789 covers hand torque tools only. Not an IMO requirement. | Powered tools follow the manufacturer's instructions; any tool is recalibrated after overload, repair or improper handling |
| Load cells and dynamometers for load testing | Certificate current at the time of test | Class and flag requirements for test equipment used under SOLAS Reg. II-1/3-13 (in force 1 January 2026) and ILO Convention No. 152 | The interval is that of the test equipment's own certificate |
| Reference standards used on the job | Per each standard's own recalibration interval | Each reference standard carries its own calibration certificate from the laboratory that issued it, and that certificate — the issuing laboratory and its reference — is named on yours, so the chain behind a reading is checkable at its source. We do not publish our own accreditation status on a marketing page; what is held for a quoted scope is stated in writing with the quotation. | Named on the certificate with its own certificate reference |
| Recalibration after repair, sensor change or impact | Event-driven | Manufacturer's instructions and the vessel's SMS under the ISM Code | Also after a failed verification, before the instrument returns to service |
Attendance is planned from the nearest of 6 service bases to any of the 299 ports in the published index, around the clock. If your port is not listed, ask — the index is what we publish, not the limit of where we mobilise.
Ask, and you get a straight answer in writing — including "no". We do not publish authorisation scopes on a marketing page, and we never publish a certificate: a scan on a supplier's own site proves only that the supplier owns an image editor. Send the flag, the class and the scope. The quotation answers for that job — where an authorisation is held, the granting entity, the scope and the reference, checkable by you on that authority's public register; where one is not held, we say so, and what we would do instead.
Most of this scope is calibrated in place: gas detectors, pressure and temperature instruments, tank gauging, loading computers. Teams attend from the nearest of six bases — Istanbul, Izmir, Iskenderun, Varna, Constanta and London — and the 24/7 line covers every port on the index. Some work is better done at a base, where an instrument needs a stable environment or a longer soak. Send the ETA, the ETD and the instrument list; you get back what fits the window and what does not, before the vessel arrives. If an instrument must go ashore and the window is too short to return it, the choice is a replacement supplied with the attendance or return at a later port — agreed before it leaves the ship.
Acceptance is decided by the attending surveyor or PSC officer, not by us, and it turns on two things. The first is what is on the certificate: the instrument identified by serial number, the reference standard named with its own certificate reference, the calibration points, as-found and as-left values, uncertainty, date and the technician. Ours carry all of that. The second is who is permitted to do the work, because for some items the regulation names the party and no paperwork substitutes for it — the 15 ppm bilge alarm accuracy check is reserved to the manufacturer or persons it authorises (MEPC.107(49) para. 4.2.11), and ODME seal replacement and reset after permanent repair to the manufacturer or his agent (MEPC.108(49) para. 5.2). Send the flag, the class and the scope with the enquiry; the quotation says in writing which of these we cover and which we do not, before you award the job.
The instrument is tagged as out of tolerance, quarantined from service and reported to you before the team leaves the vessel. Where the fault is a sensor, a cell or a seal, send the make and type with the attendance request and the part can travel with the team; found on the day, it is sourced against your order rather than promised from stock. Where an instrument cannot be brought back into tolerance, you get that in writing, so it is replaced before the survey rather than at it.
SOLAS Reg. XI-1/7 requires the instrument and requires that suitable means for its calibration be provided. It sets no interval. IMO Res. MSC.581(110), adopted 27 June 2025, recommends testing with properly calibrated equipment and that the manufacturers' instructions be strictly followed — again, no interval. The interval comes from the manufacturer's instructions and the vessel's planned maintenance system under the ISM Code; published schedules for the four-gas instruments in common shipboard use fall between six and twelve months. Send the make and model and we tell you which applies before the attendance. A bump test is not a calibration: it proves the sensor responds, not that the reading is correct.
The portable gas detection kit and its certificates, the UTI tapes, fixed detection on deck and in the pump room, cargo tank high-level and overfill alarms, the inert gas system oxygen analysers, the 15 ppm bilge alarm and the ODME. An inspector checks that the certificate is current, that it identifies the instrument by serial number, and that the label on the instrument agrees with the certificate. Send the vetting date and the list is worked in that order.
The equipment actually found on ships, indexed by category, with the corporate history a superintendent needs — a plate still says Norsafe, Schat-Harding, Germanischer Lloyd. This is what the work covers. It is not a list of approvals: maker authorisation is granted per make and per type, and ours is supplied in writing with a quotation.
Dräger
MSA Safety
Riken KeikiDräger
Kongsberg MaritimeDrägerMarks are reproduced on their own light ground, unmodified, and are the property of their owners. A mark here identifies equipment this work covers. It does not indicate any endorsement, authorisation or approval of ShipCertify by its owner.
17 of 242 marks on file
Quote and attendance plan by return. Emergency attendance 24/7.