ERT™ Power Section Specification (Metric)
700ERTcr7857
177.8 mm 7:8 Lobes 5.7 Stages
Rotor Specifications
Overall Length 6397.8 mm
Avg. Diameter 105.42 mm
Contour Length 6220.0 mm
Eccentricity 6.25 mm
Major Diameter 117.93 mm
Head Diameter 101.60 mm
Head Length 177.8 mm
Weight 415 kg
Thread Form 2 7/8" API Reg
Stator Specifications
Overall Length 6604.0 mm
Tube OD 177.80 mm
Contour Length 6184.9 mm
Tube ID 123.32 mm
Rubber Cut-back
Side 1: 209.5 mm
Side 2: 209.5 mm
Weight 567 kg
Material Alloy Steel
Performance Specifications
Flow Range 1136-2839 LPM
Rev per Unit Volume 0.06 Rev/L
Speed Range 69-173 RPM
No Load Pressure Loss 1744 kPa
  POB XTH
Max Rec Press 10,890 kPa 11,650 kPa
Torque @ Max Press 24,340 N-m 26,030 N-m
Stall Pressure 19,940 kPa 21,320 kPa
Stall Torque 44,650 N-m 47,760 N-m
Stator Minors and Fit (mm) at 21°C
  XTH POB
Group Minor Fit Minor Fit
C 105.23 0.19 105.28 0.14
0 105.41 0.01 105.49 -0.06
1 105.71 -0.29
2 105.77 -0.34 105.74 -0.32
5 106.04 -0.62
 
Reline Lengths (mm) Max 6604 Min 6452
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 40,000
Fit Increase
Change in Temperature (°C) 0 20 40 60 80 100 120 140 160 180 Fit Increase (mm) 0 0.5 1
Speed
1136 LPM 1987 LPM 2839 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 Speed (RPM) 0 50 100 150 200
Mechanical Power
1136 LPM 1987 LPM 2839 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.