Stern Shaft Measurement at Laem Chabang: Poker Gauge Documentation
MaxiDive Co., Ltd. carried out stern shaft measurement at Laem Chabang Port, Thailand, documenting underwater poker gauge readings while a commercial vessel remained afloat.
The assignment focused on the stern shaft measuring arrangement, with underwater photographs supporting the measurement documentation. For shipowners, vessel managers and technical superintendents, these records provide information for reviewing bearing wear trends and planning further inspection or maintenance.
Stern Shaft Measurement at Laem Chabang: Project Scope
The work centred on obtaining poker gauge readings and documenting the accessible measuring arrangement beneath the waterline.
Photographs show the instrument at the access opening and provide a close-up reference of the gauge. Together with the recorded measurements, this documentation gives the vessel’s technical team material to review alongside previous readings and relevant equipment drawings.
The purpose is to establish a usable measurement record that remains connected to the vessel’s own maintenance history.
What a Poker Gauge Reading Represents
A poker gauge records a reference distance at the stern shaft measuring arrangement, typically associated with the aft stern tube seal. Comparing readings taken under consistent conditions can indicate changes in shaft position associated with stern tube bearing wear.
The reading must be interpreted using the applicable equipment design and reference records. It should not automatically be treated as a direct measurement of total bearing clearance or as confirmation of complete shaft alignment.
This distinction is important when preparing technical reports: the recorded reading, the change from an earlier reference and the engineering interpretation are related but separate pieces of information.
Why Comparable Reference Records Matter
The value of a wear-down measurement depends on the quality of the comparison.
Technical review should consider:
The manufacturer’s drawings and designated measurement points.
The measuring instrument, reference surfaces and shaft position used.
Previous readings and any changes to the seal, liner or measuring arrangement.
Applicable manufacturer guidance and survey requirements.
Changes to the reference arrangement can affect subsequent readings. A difference should therefore be reviewed in context before it is attributed to bearing wear.
A consistent measurement history gives technical teams a stronger basis for identifying changes that require closer investigation.
Photographic Documentation for Technical Review
Underwater photographs provide context that a numerical entry alone cannot show. They help identify the accessible measuring area and illustrate the position of the instrument.
For this Laem Chabang assignment, the photographic record complements the poker gauge documentation. This supports communication between the diving team, onboard engineers and shore-based technical management.
Photographs support the measurement record; the documented readings and their reference conditions remain essential to interpretation.
Supporting Maintenance and Dry-Dock Planning
Stern shaft measurement records can help vessel managers:
Compare current readings with previous inspection or dry-dock records.
Identify changes requiring engineering review or follow-up measurement.
Define the scope of future inspections and planned maintenance.
Prepare relevant information for discussions with equipment specialists and classification societies, where required.
The practical benefit is better information for deciding what to monitor and what to investigate next. Acceptance of wear conditions must be assessed against the relevant technical criteria and applicable survey requirements.
Planning Underwater Measurement at Laem Chabang
Planning should account for the vessel’s stern seal arrangement, measuring access, available reference records and expected port stay.
Providing the relevant drawings and previous poker gauge readings before attendance helps establish the proposed scope and documentation requirements. Coordination between the vessel’s technical team, port agent and commercial diving team supports preparation for the underwater work.
MaxiDive provides underwater inspection and measurement support for commercial vessels operating in Thailand.
Arrange a Stern Shaft Measurement
Planning a stern shaft measurement at Laem Chabang?
Contact MaxiDive with your vessel particulars, relevant stern seal drawings, previous poker gauge records and expected port call. Our team can review the proposed scope and reporting requirements.
Email: info@maxidive.com
Phone: +66 93 272 6084
Website: www.maxidive.com
MaxiDive — We work under pressure.
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