Pipe, Paint, Mooring and E&I: A Six-Discipline CALM Buoy Campaign

Client

2025 CALM Buoy Campaign

Location

Kumul Platform, Papua New Guinea

SCope of Work

CASE STUDY · OFFSHORE & MARINE CAMPAIGNS · 2025

6 Disciplines	ASME IX Coded weld	NDT + Paint Certified	0 LTIs

Capability
Offshore & Marine Campaigns

Sector
Offshore oil & gas

A multi-discipline offshore campaign on a Catenary Anchor Leg Mooring buoy. The scope covered pipe welding and spool replacement, instrumentation reinstatement, solar array re-cable, hull blast and paint, valve change-outs, and weight-cell, chain and shackle replacement, all delivered off over-water certified scaffolding within a single campaign window.

Scope

Pipe welding and spool replacement to ASME IX procedures: carbon and stainless process lines, NDT cleared in-situ.
Instrumentation replacement and reinstatement, with loop checks against the commissioning baseline.
Solar array system replacement and full re-cabling: over-water lift, marine-grade install.
UHP water blasting, surface preparation, and full blast and paint of the buoy hull, with the paint system certified per operator spec.
Valve replacements on process pipework, hydro and pressure tested through to sign-off.
Weight cell, chain and shackle system replacement, with the mooring re-tensioned and certified.

Approach

Six disciplines inside one campaign window means trade sequencing matters as much as the scope itself. Over-water certified scaffolding was erected first to give every following trade a stable platform. Surface prep (UHP water blasting) preceded blast and paint, with the paint system signed off against an independent paint inspector. Coded ASME IX pipe welders ran spool replacements in parallel, NDT cleared as each weld closed out. Instrumentation and the full solar array re-cable were staged behind the structural and surface scope. Mooring scope (weight cell, chain, shackles) ran last so all topside loads were finalised before re-tensioning.

CALM buoy hull before MTIS blast and paint works during the 2025 offshore campaign at Kumul Platform in Papua New Guinea

Before: CALM buoy hull prior to blast and paint works.

CALM buoy hull after MTIS blast and paint works as part of the 2025 six-discipline offshore campaign in Papua New Guinea

After: hull blast and paint works completed.

Solar array installed on a CALM buoy during MTIS solar replacement and re-cabling works at Kumul Platform in Papua New Guinea

Solar array replacement and full re-cabling.

Outcome

All six disciplines closed out inside the campaign window with zero lost-time incidents. Pressure-test packs, NDT records, paint certification, and mooring re-tension records were handed over to the operator as one consolidated dossier.

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