Ultrasonic Thickness Testing Cape Town measures how much wall is left. A probe sends a pulse through the material and times the return off the back wall, giving a thickness reading through paint, coating and surface corrosion without cutting anything open.
It is the standard method for tracking corrosion on storage tanks, pipework, pressure vessels, ship plate and structural hollow sections, and it is what tells you whether a tank has another ten years in it or needs plate replacement now.
Send the asset, the number of test points and whether a corrosion rate assessment is needed.
Get UT QuotesWhat a Thickness Survey Tells You
A single set of readings gives you present condition against the original or minimum design thickness. Two sets taken years apart give you something more useful: a corrosion rate, and from that a remaining life estimate and a defensible inspection interval.
That is why grid location matters. Readings taken at recorded, repeatable points can be compared over time; readings taken wherever the technician could reach cannot.
Where Thickness Testing Is Used
- Storage tank shell courses and roofs
- Pressure vessels and separators
- Process and utility pipework
- Pipeline and line-of-sight spool pieces
- Ship hull plate, tanks and hatch covers
- Silo and hopper plate
- Structural hollow sections and tubular members
- Boiler tubes and headers
- Jetty and marine steelwork
- Corrosion under insulation investigation points
Getting Comparable Readings
- Use a fixed grid. Numbered, recorded points that can be found again on the next survey. Random readings cannot establish a corrosion rate.
- Record the nominal thickness. A reading of 7.2mm means nothing without knowing whether the plate started at 8mm or at 12mm.
- Note the surface preparation. Heavy scale has to be removed at the reading point or the result is wrong.
- Ask for the minimum allowable thickness. The report should state it and flag any point approaching it, not just list numbers.
- Keep the data. The value compounds. A third survey against two prior data sets is far more informative than a first survey ever is.
Ultrasonic Thickness Testing Prices in Cape Town
Usually priced per technician day or per reading point on large grids. Indicative ranges:
| Item | Indicative range | Notes |
|---|---|---|
| Level 2 UT technician, per day | R6,500 – R14,000 | Equipment included |
| Rope access certified UT technician, per day | R8,500 – R18,000 | Work at height |
| Per reading point, large grid | R35 – R120 | Volume dependent |
| Storage tank shell survey | R22,000 – R95,000 | Size and course count dependent |
| Pipework survey, per line | R4,500 – R22,000 | Length and access dependent |
| Pressure vessel survey | R12,000 – R55,000 | Including report |
| Corrosion rate and remaining life assessment | R8,500 – R32,000 | Requires historic data |
| Surface preparation at reading points | R45 – R150 per point | Where scale must be removed |
| Mobilisation | R3,500 – R12,000 | Site dependent |
Indicative Cape Town ranges, not quotations. Access is usually the larger part of the cost on tanks and elevated pipework, which is why combining the survey with other rope access work on the same structure saves money.
Send the asset list and compare UT contractors on grid methodology as well as day rate.
Compare QuotesSafety and Compliance
The technician should hold ISO 9712 or SNT-TC-1A Level 2 certification in ultrasonic testing specifically, and a separate rope access certification where the readings are taken at height. Where results will be used to justify continued operation of pressure equipment, an Approved Inspection Authority may need to be involved — confirm the regulatory position before commissioning the survey rather than after.
Frequently Asked Questions
How much does ultrasonic thickness testing cost in Cape Town?
A Level 2 technician commonly runs R6,500 to R14,000 a day, or R8,500 to R18,000 where rope access is needed. On large grids, per-point rates of R35 to R120 are common. A storage tank shell survey typically lands between R22,000 and R95,000. These are indicative ranges, not quotes.
How accurate is ultrasonic thickness testing?
Typically within a few hundredths of a millimetre on prepared clean steel with a correctly calibrated instrument. Accuracy falls where there is heavy scale, thick coating, high temperature or severe back-wall pitting, which is why surface preparation at the reading point matters.
Can readings be taken through paint?
Yes with modern instruments using echo-to-echo measurement, which ignores the coating layer. Heavy or uneven coating and corrosion product still degrade the result, and some contractors will prepare the point regardless for repeatability.
How often should thickness testing be done?
It depends on the calculated corrosion rate and the governing code. Intervals of three to five years are common on storage tanks, shorter on aggressive service. The first survey sets the baseline; the interval becomes defensible only once there is a second data set.
What is the difference between UT thickness testing and UT flaw detection?
Thickness testing measures remaining wall. Flaw detection looks for internal discontinuities such as weld defects, laminations and cracking. Both are ultrasonic, but they use different probes, settings and technician skills, and a quote for one is not a quote for the other.
Do readings have to be taken at the same points each time?
For a corrosion rate, yes. A fixed numbered grid recorded on a drawing is what makes surveys comparable. Readings taken at convenient rather than recorded positions can show current condition but cannot establish a trend.
Can it be done at height without scaffolding?
Yes. Rope access is the standard method for tank shells, elevated pipework and structural members, and it often costs considerably less than erecting scaffold for what may be a one- or two-day survey.
Thickness surveys are quoted through Rope Access Cape Town alongside the tank and structural inspection work they usually form part of.
Related Services
Rope Access Cape Town is a free quote-matching service. The work at height is carried out by the independent rope access contractors that quote you, and your contract is with the contractor you appoint. Check each contractor's own certification, insurance and references before appointing anyone.
Describe the job once and compare quotes from LEADERR APPROVED rope access contractors covering your area.
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