• Check of mast and sub identification and nameplates
• Check of mast and sub original certification and design (COC and nameplate)
• Check of last Cat IV inspection report
• Check of last Cat III inspection reports
• Check of any major repair or modification

• Cat IV is conducted as per API RP 4G.
• Full structure inspection of mast and substructure
• Inspection of all elements and sub-systems of mast and sub 
• Identification of any required repair job
• Preparation of the recertification file

Depending on the agreed scope, Cat IV main outputs are the following:

• Complete inspection report, supported by photos
• Punch list of all findings (Excel or online)
• Recording of Cat IV inspection as per API RP 4G Appendix checklist
• If requested, supervision of repair jobs
• If requested, preparation of recertification file
• If requested, preparation of modification file, including design review

Please contact us for old non-identified masts/subs.