ERT™ Power Section Specification (Metric)
675ERTcr4570
171.5 mm 4:5 Lobes 7.0 Stages
Rotor Specifications
Overall Length 5143.5 mm
Avg. Diameter 89.20 mm
Contour Length 4965.7 mm
Eccentricity 8.99 mm
Major Diameter 107.19 mm
Head Diameter 101.60 mm
Head Length 177.8 mm
Weight 257 kg
Thread Form 2 7/8" API Reg
Stator Specifications
Overall Length 5334.0 mm
Tube OD 171.45 mm
Contour Length 4953.0 mm
Tube ID 103.63 mm
Rubber Cut-back
Side 1: 190.5 mm
Side 2: 190.5 mm
Weight 466 kg
Material Alloy Steel
Performance Specifications
Flow Range 1136-2650 LPM
Rev per Unit Volume 0.13 Rev/L
Speed Range 144-336 RPM
No Load Pressure Loss 1186 kPa
  POB XTH
Max Rec Press 11,950 kPa 12,800 kPa
Torque @ Max Press 13,800 N-m 14,790 N-m
Stall Pressure 21,870 kPa 23,430 kPa
Stall Torque 25,260 N-m 27,060 N-m
Stator Minors and Fit (mm) at 21°C
  XTH POB
Group Minor Fit Minor Fit
C 89.08 0.13 89.10 0.10
0 89.38 -0.18 89.38 -0.18
4 89.61 -0.41 89.66 -0.46
8 89.92 -0.71
 
Reline Lengths (mm) Max 5334 Min 5182
Alt. Stator OD (mm)   -   -
Alt. Rotor Diameter (mm) - - - -

Max DP for reliable operation will vary based on
operational conditions. Refer to ERT Operational
Guidelines for guidance.

Torque
Differential Pressure (kPa) 0 10,000 20,000 Torque (Nm) 0
Fit Increase
Change in Temperature (°C) 0 50 100 150 Fit Increase (mm) 0
Speed
Differential Pressure (kPa) 0 10,000 20,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 10,000 20,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 5,000 10,000 15,000 20,000 Torque (Nm) 0 5,000 10,000 15,000 20,000
Fit Increase
Change in Temperature (°C) 0 20 40 60 80 100 120 140 160 180 Fit Increase (mm) 0 0.2 0.4 0.6 0.8 1
Speed
1136 LPM 1893 LPM 2650 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 20,000 Speed (RPM) 0 100 200 300 400
Mechanical Power
1136 LPM 1893 LPM 2650 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 20,000 Mechanical Power (Kw) 0 200 400 600
©2026 NOV. All rights reserved. Except as noted, all trademarks referenced in this document are trademarks of NOV. Performance curves describe theoretical performance with 175°F (79°C) water and are for reference only. Operational fit and drilling conditions will affect performance. Operation above maximum recommended limits will reduce life. Specification data are subject to change without notice.
PS App v.