PH Tool Extended Range Variable Diameter Step Block

The Extended Range Variable Diameter (ERVD™) Step Block was jointly designed by PH Tool and Holloway NDT, intended for use as a versatile curved step block for thickness testing of pipe.

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Description

Available in both imperial and metric, with multiple sizes in one convenient block.  The ERVD™ Block covers the following diameters and steps:

Imperial

  • 3/4” NPS (1.050” OD) Steps .050, .150, .300”
  • 1” NPS (1.315” OD) Steps .050, .200, .400”
  • 2” NPS (2.375” OD) Steps .050, .250, .500”
  • 4” NPS (4.500” OD) Steps .050, .250, .500, .750”
  • Flat area for larger pipes. Steps .050, .200, .400, .600“
  • “Bonus” Flat Step by using .750” block thickness
  • 18 calibration thicknesses in total
  • 2” NPS (2.375” OD) Steps .050, .250, .500”
  • 4” NPS (4.500” OD) Steps .050, .250, .500, .750”
  • Flat area for larger pipes. Steps .050, .200, .400, .600“
  • “Bonus” Flat Step by using .750” block thickness
  • 18 calibration thicknesses in total

Metric

  • DN 20 (26.7mm OD) Steps 1.0, 4.0, 8.0mm
  • DN 25 (33.4mm OD) Steps 1.0, 5.0, 10.0mm
  • DN 50 (60.3mm OD) Steps 1.0, 6.0, 12.0mm
  • DN 100 (114.3mm OD) Steps 1.0, 6.0, 12.0, 18.0mm
  • Flat area for larger pipes. Steps 1.0, 5.0, 10.0, 15.0mm
  • “Bonus” Flat Step by using 20mm block thickness
  • 18 calibration thicknesses in total

Engraved markings show pipe diameters for each section. Narrow slots are cut completely through the block to create multiple points for calibration. The various distances from the OD to the outboard side of the slot represent different wall thicknesses. Thickness values are engraved directly on the block for convenient calibration. Block also engraved with alloy and unique S/N that ties it to the certs.

Additional information

ERVD Step Block

Imperial, Metric