ERT™ Power Section Specification (Metric)
675ERTcr7850
171.5 mm 7:8 Lobes 5.0 Stages
Rotor Specifications
Overall Length 4775.2 mm
Avg. Diameter 101.94 mm
Contour Length 4597.4 mm
Eccentricity 6.39 mm
Major Diameter 114.73 mm
Head Diameter 101.60 mm
Head Length 177.8 mm
Weight 307 kg
Thread Form 2 7/8" API Reg
Stator Specifications
Overall Length 4940.3 mm
Tube OD 171.45 mm
Contour Length 4572.0 mm
Tube ID 113.72 mm
Rubber Cut-back
Side 1: 184.1 mm
Side 2: 184.1 mm
Weight 390 kg
Material Alloy Steel
Performance Specifications
Flow Range 1136-2650 LPM
Rev per Unit Volume 0.07 Rev/L
Speed Range 81-189 RPM
No Load Pressure Loss 1524 kPa
  POB XTH
Max Rec Press 9,530 kPa 10,210 kPa
Torque @ Max Press 18,660 N-m 20,000 N-m
Stall Pressure 17,440 kPa 18,690 kPa
Stall Torque 34,150 N-m 36,590 N-m
Stator Minors and Fit (mm) at 21°C
  XTH POB
Group Minor Fit Minor Fit
E 101.57 0.37 101.57 0.37
0 101.80 0.14 101.80 0.14
2 102.03 -0.09 102.03 -0.09
4 102.18 -0.24 102.18 -0.24
 
Reline Lengths (mm) Max 4940 Min 4788
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 Torque (Nm) 0
Fit Increase
Change in Temperature (°C) 0 50 100 150 Fit Increase (mm) 0
Speed
Differential Pressure (kPa) 0 10,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 10,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 5,000 10,000 15,000 Torque (Nm) 0 10,000 20,000 30,000
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
Speed
1136 LPM 1893 LPM 2650 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 Speed (RPM) 0 50 100 150 200 250
Mechanical Power
1136 LPM 1893 LPM 2650 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 Mechanical Power (Kw) 0 100 200 300 400 500
©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.