Acceptance Criteria for Platform Inspection

 Guideline Acceptance Criteria for Platform Inspection

I. Above Water and Splash Zone Visual and Coating Survey

• Jacket Structure
• Deck Structure
• Appurtenance and Personnal Safety Device Survey
• Equpment Survey

API RP 2 SIM Par. 6.3.1

... Indications of obvious overloading, deteriorating coating systems, excessive corrosion, and bent, missing, or damaged members of the structure in the splash zone and above water. Guidance on the grading of coating systems is provided in NACE SP0108.

Damage or deterioration to appurtenances and personnel safety, escape, and evacuation devices.

Baca Juga ► Procedure Platform Inspection

API RP 2 SIM Par. 6.3.2

...Components should be inspected for presence of damage, straightness, corrosion, weld integrity, and modifications. If above-water damage is detected, a complete record of the damage should be made with sufficient detail to allow engineering personnel to determine if repairs or further NDT are required. ...

API RP 2 SIM Par 6.3.3

The Level I survey should include a coating survey to assess the effectiveness and condition of the various protective coating systems on the topsides. The inspection should detect deteriorating coating systems and excessive corrosion.

II. Jacket Leg Thickness Measurement

Minimum thickness or corrosion allowance refer to Structural Design and API RP 2A

III. Cathodic Protection Survey

NACE Standard SP 0176

Section 4 Par 4.3.1 negative (cathodic) voltage of at least -0.80 V measured between the platform surface and a silver/silver chloride (20 ohm-cm seawater) reference electrode (Ag/AgCl) contacting the water.

IV. Pipeline Flange Isolation Measurement

API RP 2SIM Par 6.3.5.4

.... In general, the survey is accomplished by taking measurements on either side of an actual or potential isolation barrier. Identical measurements indicate electric continuity whereas different measurements indicate isolation.

V. Deck Elevation Survey

API RP 2SIM Par 6.3.6

In operational areas of known or suspected subsidence, the Level I survey should include a survey of the gap between the cellar deck bottom of steel and the mean water level. … Suspected subsidence or differential settlement of the structure should be recorded and if significant (e.g. the deck is lower than assumed) could trigger an assessment.

VI. Debris Survey

No debris attached to member or no possible damage caused by the debris.

VII. Underwater General Visual Survey

API RP 2SIM Par. 6.5

Routine underwater platform inspections using either Level II, III, or IV surveys should be conducted to detect, properly measure, and record any platform defects, deterioration, or anomalies that affect the structural integrity. Platform deterioration may include excessive corrosion to welds and members, weld/joint damage (including deformation due to overload and cracking due to fatigue damage), and mechanical damage in the form of dents, holes, bows, and gouges

VIII. Marine Growth Survey

Refer to Structural Design and API RP 2SIM Par 6.5

… Anomalies may include nonoperating or ineffective corrosion protection system, scour, seafloor instability, hazardous or detrimental debris, and excessive marine growth.

IX. Scour Survey

Refer to Structural Design and API RP 2SIM Par 6.5

… Anomalies may include nonoperating or ineffective corrosion protection system, scour, seafloor instability, hazardous or detrimental debris, and excessive marine growth. …

X. Anode Survey

Refer to Structural Design and API RP 2SIM Par 6.5

… Anomalies may include nonoperating or ineffective corrosion protection system, scour, seafloor instability, hazardous or detrimental debris, and excessive marine growth. …

XI. Riser/ J-tubes / Conductor/ Caisson underwater survey

Refer to Structural Design and API RP 2SIM Par 6.5

... If during the course of an inspection program, anomalies are discovered that could potentially affect the structural integrity of the platform, conductors, risers and J-tubes, or appurtenances, qualified personnel should conduct an evaluation to determine if and when additional inspection and/or remedial measures should be undertaken. ...

XII. Joint NDT

API RP 2SIM Par 6.5.4.3

… If crack indications are reliably reported, they should be assessed by a competent engineer. Suspected false alarms may be resolved by a second inspection using a different method or by shallow surface grinding.