How to Measure Thickness of a Large Steel Storage Tank with Wintact WT-100A Malaysia Copy Link Large steel storage tanks are widely used in Malaysian factories, palm oil mills, water treatment facilities, chemical plants, manufacturing facilities and other industrial operations. One common maintenance question is: “How can we check the remaining thickness of a large steel tank without cutting the tank wall?” For suitable materials and inspection conditions, an ultrasonic thickness gauge such as the Wintact WT-100A can measure material thickness from one accessible side. However, measuring a large tank effectively requires more than taking one or two random readings. A systematic measurement plan provides much more useful information for maintenance and corrosion monitoring. Why Measure Steel Tank Wall Thickness? Steel tanks can experience gradual material loss due to: Internal corrosion External corrosion Moisture Chemical exposure Environmental conditions Process contents Long-term operation Localised corrosion Some deterioration may not be obvious from visual inspection alone. Ultrasonic thickness measurement provides numerical information about the remaining thickness at selected measurement locations. Why One Measurement Is Not Enough Imagine measuring a large tank at one convenient location and obtaining: 8.10 mm Can you conclude that the entire tank wall is 8.10 mm? No. A large tank may have different conditions at different locations. For example: Upper Section: 8.08 mm Middle Section: 7.96 mm Lower Section: 7.21 mm Localised areas may experience greater material loss than others. This is why a measurement grid or documented inspection locations can be useful. Create a Tank Thickness Measurement Plan Instead of measuring randomly, divide the accessible tank surface into documented locations. For example: Tank T-01 Area A Upper Shell Area B Middle Shell Area C Lower Shell Area D Selected corrosion-prone location Each area can then contain several measurement points. This makes it easier to compare results during future inspections. Example Tank Thickness Map A simple record might look like this: Upper Shell Point U1: 8.05 mm Point U2: 8.02 mm Point U3: 8.07 mm Middle Shell Point M1: 7.91 mm Point M2: 7.88 mm Point M3: 7.93 mm Lower Shell Point L1: 7.30 mm Point L2: 7.18 mm Point L3: 7.25 mm The lower section shows different readings from the upper areas and may justify closer investigation. How to Take an Ultrasonic Thicknss Measurement A general measurement process may include: Identify and document the measurement location. Ensure the equipment is in an appropriate and safe condition for inspection. Inspect the surface. Remove loose contamination where required by the procedure. Configure the instrument for the material. Apply suitable ultrasonic couplant. Position the probe correctly. Obtain a stable and repeatable reading. Record the measurement. Repeat at the other predetermined locations. Actual inspection work should follow the appropriate site procedures and safety requirements. Why Measure the Same Points Again? Suppose Point L2 measures: 2024: 7.82 mm 2025: 7.50 mm 2026: 7.18 mm Now the maintenance team has more than a thickness reading. It has a thickness trend. This historical information can help determine which areas deserve further investigation and support maintenance planning. Can WT-100A Detect Corrosion Inside the Tank? The WT-100A measures remaining material thickness at the measurement location. It does not provide a complete image of the inside of the tank. A reduced reading may indicate material loss, but the extent and cause of deterioration may require: Additional thickness measurements Visual inspection Other NDT methods Engineering assessment For critical tanks, use the applicable inspection procedure and qualified personnel. What About Painted Tanks? Coatings can influence conventional ultrasonic thickness measurements. If the objective is to determine the remaining steel wall thickness, do not automatically assume that the coating is excluded from the reading. Depending on the application, surface preparation or a more specialised through-coating measurement technique may be required. Where Should a Large Tank Be Checked? Inspection locations should be selected according to the tank design, service conditions, previous inspection history and applicable procedure. Potential areas of interest may include: Lower shell areas Moisture-prone locations Areas with visible corrosion Locations exposed to chemicals Previously repaired sections Selected shell courses Areas identified during previous inspections The correct locations depend on the specific asset. Storage Tank Thickness Monitoring in Malaysia Ultrasonic tank thickness measurement may be relevant to: Palm oil mills Manufacturing plants Chemical processing Water treatment Petrochemical facilities Food processing Industrial storage Marine facilities Engineering companies Maintenance contractors Is WT-100A Suitable for Every Tank Inspection? No single portable thickness gauge is suitable for every tank inspection requirement. More specialised equipment or procedures may be needed for: Thick coatings High-temperature surfaces Difficult corrosion conditions Special materials Formal NDT inspection programs Safety-critical or regulated assets The WT-100A should be selected when its measurement capability matches the actual application. Turn Tank Measurements into Useful Maintenance Data The best workflow is not: Measure → Write Down Number → Forget A better approach is: Tank ID → Measurement Grid → Thickness Readings → Historical Comparison → Identify Changes → Further Inspection → Maintenance Planning This turns ultrasonic thickness measurement into part of an asset condition-monitoring program. Looking for a Steel Tank Thickness Gauge in Malaysia? MTM Precision supplies ultrasonic thickness gauges and industrial testing instruments for Malaysian factories, engineering companies, maintenance teams and inspection applications. Before selecting an instrument, tell us: Tank Material Approximate Wall Thickness Tank Size / Application Surface Condition Inspection Purpose MTM Precision can help determine whether the Wintact WT-100A or another ultrasonic thickness gauge is suitable for your application. Contact MTM Precision MTM Precision Sdn. Bhd. Showroom & Service Centre No. 29-1 & 29-2, Jalan Bandar 18, Pusat Bandar Puchong, 47160 Puchong, Selangor, Malaysia 🌐 Website: www.mtmpre.com.my 📧 Email: mtmpre@yahoo.com 📱 WhatsApp: +6016-660 7346