Pressure vessel inspection services for API 510 and NDT

These are planning ranges, not quotes. Vessel size, material, operating temperature, access and the report you need change the real price, and several vessels at one plant cost less per vessel than a single call out.

API 510 covers the in service inspection, repair, alteration and rerating of pressure vessels built to ASME Section VIII. The owner or user must have an authorized inspector sign off the records. Intervals come from measured corrosion rates and remaining life: the internal or on stream inspection can be no longer than half the remaining life or ten years, and external inspections follow at most every five years unless a risk based inspection (RBI) program says otherwise. The thickness data you buy now therefore decides how long you wait for the next outage. Ask the contractor to state which API 510 clause each scope item answers, and have the report show remaining life by component.

Weld seams are the part of a vessel most often questioned by an inspector or a customer. PAUT and TOFD give a sized, recorded image of a flaw and are the usual choice on thick walls, while radiography is still specified on new construction and repairs where the code asks for film or digital images. Surface methods catch the cracks that volumetric methods miss. For the method background see ultrasonic testing services, radiographic testing and weld X-ray inspection and magnetic particle inspection. Piping attached to the vessel is covered under pipe weld testing.

Most unplanned vessel repairs trace back to wall loss nobody measured. Corrosion mapping with automated UT shows thinning as a color map instead of a few spot readings, and it is repeatable, so next year's scan compares point for point. Insulated vessels need a plan for corrosion under insulation: remove insulation at the likely spots, or screen with profile radiography or pulsed eddy current first. Tank farms with vessels and tanks together can combine the visit with a storage tank inspection.

Refinery and chemical plant reliability engineers buy API 510 inspections on a schedule set by their RBI program. Food, beverage and pharmaceutical plants order them for steam, air and process vessels before insurer audits. Power plants and manufacturers need them for feedwater heaters, air receivers and autoclaves. Fabricators and repair shops order weld NDT after a repair or alteration. Buyers of a plant order a baseline inspection of every vessel during due diligence.

1. You send vessel tag, size, design pressure and temperature, material, year built, product and the last inspection report.
2. The inspection company proposes a plan: on stream or internal, methods, crew and access. Internal work needs the vessel isolated, cleaned and gas free first.
3. Crews mobilize, complete site safety and permit steps and inspect in the agreed window. Confined space entry needs a permit, an attendant and a rescue plan.
4. Data is reviewed by a qualified technician and the API 510 inspector, who assigns remaining life and repair priorities.
5. You receive a report with thickness maps, weld results, a defect list, corrosion rates, a recommended interval and repair recommendations. Urgent findings are called in the same day.

Shutdown, cleaning and scaffolding often cost more than the inspection itself. Ask whether the quote includes them.

• External in service API 510 inspection. $1,200 to $5,000 per vessel, depending on size and the number of thickness points.
• Internal inspection with weld NDT. $3,000 to $15,000 per vessel, plus cleaning, scaffolding and vapor control.
• Corrosion mapping of a shell section. $800 to $3,500.
• PAUT or TOFD of vessel welds. $1,500 to $6,000 depending on weld length and wall thickness.
• Radiography of repair welds. $60 to $250 per weld in the field.
• Mobilization and travel. $500 to $3,000 per trip for remote plants.

Standby during permits, night shifts and rush reports add to these numbers. Ask each contractor to list them separately so quotes compare like for like. The NDT inspection cost guide shows how crews price the underlying methods.

Check that the lead is an API 510 authorized inspector and that the UT, PAUT, MT and RT technicians hold ASNT SNT-TC-1A or CP-189 Level II certification. Ask for a sample report on a vessel like yours and how they record PAUT and corrosion map data. Confirm the confined space program and injury record, insurance, and how quickly first data is delivered after the crew leaves site. Quote comparisons only work when the scope, the code edition and the minimum thickness assumptions are the same in every response.