ERVW Piping Calibration Blocks
(Extended Range Variable Wall Piping Calibration Blocks)
PH Tool and Holloway NDT have jointly designed and produced a set of three Extended Range Variable Wall (ERVW) Piping Calibration Blocks.
Created for calibration in the axial direction for examination of circumferential butt welds, these blocks come in three sizes: small (3” to 5”), medium (6” to 10”) and large (12” to 20”). These blocks range from 3 to 20 pounds and 7 to 16 inches, making them lightweight and portable.
The key to the Extended Range Variable Wall series is the "variable" aspect. Only three blocks are needed to cover a large range of pipe sizes, which would otherwise require dozens of calibration blocks. The small block covers 12 pipe sizes, while the medium block covers 29 sizes. The large size covers a massive 55 inspection sizes on the pipe schedule chart. See the chart above for more information about which ERVW Piping Calibration Block can be used with which pipe sizes. Each step is also engraved with the pipe sizes (OD/wall) covered.
The ERVW blocks feature side drilled holes in accordance with T-434.3-2 for testing circumferential pipe welds. The slanted end cut eliminates corner trap reflections and allows for full DAC/TCG calibrations with conventional ultrasonic testing or phased-array ultrasonic testing. Machine-engraved transducer positioning marks aid in functionality and maximize your signal from the SDHs. Each block is machine-engraved with a unique serial number and alloy. The surface finish is media-blasted to 125 Ra max to simulate inspection conditions. The steps were placed on the ID rather than the OD to maximize usefulness of wedge curvature in accordance with the requirements of T-432.2 introduced in 2017.
FUTURE OF THE ERVW LINE:
The ERVW Piping Calibration Blocks are now being offered in steel only, but we are considering offering the sets in stainless steel soon. PH Tool is also working on designs for ERVW sets of blocks for circumferential scanning on long seam welds, as well as a set containing EDM notches. Stay tuned for more details on these new offerings.
February 2019 Update: Don't need the whole set of three blocks? No problem; we now offer the ERVW blocks as Singles. Simply specify if you need the Small, Medium, or Large block.
If you have questions about our ERVW Piping Calibration Blocks or would like to place an order, please contact us for a quote.