ERT™ Power Section Specification (Metric)
700ERT6778
177.8 mm 6:7 Lobes 7.8 Stages
Rotor Specifications
Overall Length 6426.2 mm
Avg. Diameter 103.61 mm
Contour Length 6146.8 mm
Eccentricity 7.15 mm
Major Diameter 117.91 mm
Head Diameter 101.60 mm
Head Length 279.4 mm
Weight 418 kg
Thread Form 2 7/8" API Reg
Stator Specifications
Overall Length 6604.0 mm
Tube OD 177.80 mm
Contour Length 6096.0 mm
Tube ID 118.97 mm
Rubber Cut-back
Side 1: 203.2 mm
Side 2: 304.8 mm
Weight 542 kg
Material Alloy Steel
Performance Specifications
Flow Range 1514-2839 LPM
Rev per Unit Volume 0.09 Rev/L
Speed Range 129-242 RPM
No Load Pressure Loss 1469 kPa
  POB XTH
Max Rec Press 14,350 kPa 15,380 kPa
Torque @ Max Press 23,450 N-m 25,120 N-m
Stall Pressure 26,260 kPa 28,140 kPa
Stall Torque 42,910 N-m 45,970 N-m
Stator Minors and Fit (mm) at 21°C
  XTH POB
Group Minor Fit Minor Fit
B 103.56 0.05
0 103.78 -0.18 103.81 -0.20
3 103.89 -0.28 103.96 -0.36
7 104.19 -0.58
 
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 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 20,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 5,000 10,000 15,000 20,000 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 0.2 0.4 0.6 0.8 1
Speed
1514 LPM 2177 LPM 2839 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 20,000 Speed (RPM) 0 100 200 300
Mechanical Power
1514 LPM 2177 LPM 2839 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 20,000 25,000 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.