API 570 Piping Consulting

Scope intake + damage-mechanism review per API 571

Field inspection (UT, RT, PT, VT, PEC for CUI)

Findings analysis + corrosion-rate and remaining-life calculation

Inspection report, recommendations, repair scope

Findings hand-off to your Authorized Inspector + audit defence

What this page covers

What we deliver
Methodology

Key points covered

API 570 inspector services support owner-operators in maintaining safe, code-compliant in-service piping under the API 570 Piping Inspection Code (3rd Edition 2022). Scope covers visual + NDT inspection of process piping, corrosion monitoring location (CML) tracking, CUI programme support, repair / re-rating recommendations and code-defensible inspection-interval setting.
Refineries, petrochemical complexes, gas processing plants, chemical manufacturing, LNG terminals, midstream gathering systems. Real client list spans US Gulf Coast, GCC (Aramco, ADNOC, QatarEnergy contractor sites), India (IOCL, BPCL, HPCL, Reliance Jamnagar) and Southeast Asia (PETRONAS, Pertamina, PTT).
API 570 3rd Edition 2022 (with all addenda), API 574 (inspection practices for piping system components), API 578 (material verification), ASME B31.3 Process Piping, ASME B31.4 Liquid Pipelines, ASME B31.8 Gas Pipelines, ASME Section V (NDE), NACE MR0175 / ISO 15156 (sour service), NACE SP0102 (CUI).
Standard scope-of-work to first site visit is 5-10 business days. Emergency engagements (urgent found-defect NDT characterisation, unplanned leak investigation, audit defence) we have closed inside 48 hours. Engagements are staffed with ASNT Level III NDT authority and API-code technical support.
Yes. CUI program design is a core service line. Approach: damage-mechanism review per API 571, susceptibility mapping per API 583 / NACE SP0198, inspection technique selection (RT pulsed eddy current, neutron backscatter, profile RT, on-stream insulation removal), CML placement and interval setting.
No. Atlantis is not an API 570 Authorized Inspector and does not act as inspector of record. That role stays with your own API 570 Authorized Inspector or Authorized Inspection Agency.
Yes. We attend insurer audits (Aon, Marsh McLennan, AXA XL inspections), state boiler-and-pressure-vessel inspector visits, EPA / TCEQ / DEQ audits, OSHA PSM RCA support. Pre-audit gap closure, on-site audit attendance, NCR response and corrective-action close-out.

API 570 piping inspection: circuits, CMLs and inspection intervals

API 570 organises in-service piping into circuits and classes, and sets inspection intervals from the piping class and the remaining life at each condition monitoring location (CML). Older programmes call the same points thickness measurement locations (TMLs). Atlantis carries out the thickness surveys and examinations and reports them so the API 570 inspector can set intervals and repairs.

Piping thickness survey. UT thickness readings at every CML in the circuit, compared with earlier campaigns for long-term and short-term corrosion rates and remaining life against the required thickness.

Intervals by piping class. Thickness measurements are due at the lesser of half the remaining life and the class maximum: five years for Class 1 and ten years for Classes 2 and 3. External visual inspection follows the class too.

Damage-mechanism-led techniques. Corrosion under insulation (CUI) screening, PAUT corrosion mapping at supports and dead legs, and attention to injection points and soil-to-air interfaces, which the code treats separately.

Data the inspector can use. Readings organised by circuit and CML, flagged where remaining life drives the next interval, with photographs and recommendations.

What is a CML in piping inspection?

A condition monitoring location: a designated point or area on a piping circuit where thickness, or another condition, is measured at each inspection so that corrosion rates and remaining life can be tracked over time. TML, thickness measurement location, is the older term for the same idea.

How often is piping inspected under API 570?

Thickness measurement intervals are the lesser of half the remaining life and the class maximum (five years for Class 1, ten for Classes 2 and 3). Class 4 intervals are set by the owner-user, and risk-based inspection can set different intervals once documented.