Jointly designed by PH Tool and Holloway NDT, the fully ASME-compliant ERVW® Line of Calibration Blocks is an innovative development that has dramatically improved inspection efficiency. ERVW Blocks are carefully designed to make use of tolerance and allowances in ASME code to cover the maximum number of inspection sizes with just a few select blocks. Adding these blocks your kit will save a ton of weight and space vs. hauling dozens of individual cal blocks. The best part? – you’ll never find yourself without that “one missing size” that you need for your next inspection, saving you from scrambling to have a new block made.
ERVW Blocks sets are available for pipe inspection in the axial direction, with an option for either side drilled holes or notches as the reflector type, as well as a separate set for pipe inspection in the circumferential direction. Additionally, the new ERVD™ thickness calibration block is useful for thickness testing of multiple curved surfaces.
PH Tool and Holloway NDT have jointly designed and produced a set of three Extended Range Variable Wall (ERVW)® Piping Calibration Blocks. The first iteration of the ERVW Piping Calibration Blocks was released with Side-drilled Holes as the reference reflector type. Now, PH Tool is pleased to announce that a version with EDM Notches is also available for those who prefer that reflector type over holes.
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”). As a set of three, these blocks are kitted in a protective storage case for transportation to inspection sites, offering convenient calibration on over 96 inspection sizes.
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 EDM Notches in accordance with T-434.3-1 and -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. 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.
• Small Block (3-5”) is 9 inches long, and weighs 12 lbs.
• Medium Block (6-10”) is 10 inches long, and weighs 13 lbs.
• Large Block (12-20”) is 16 inches long, and weighs 32 lbs.
• Surface Finish: Media-blasted to 125 Ra to simulate inspection conditions
• Materials: Most commonly requested in carbon or stainless steel, but other alloys available upon request
• Machine-engraved identification text (including unique serial no.)
• Inspection pipe sizes covered by each thickness step also machine-engraved on OD.