ERT™ Power Section Specification
700ERT6778
7" 6:7 Lobes 7.8 Stages
Rotor Specifications
Overall Length 253.00 in
Avg. Diameter 4.079 in
Contour Length 242.00 in
Eccentricity 0.282 in
Major Diameter 4.642 in
Head Diameter 4.000 in
Head Length 11.00 in
Weight 922 lb
Thread Form 2 7/8" API Reg
Stator Specifications
Overall Length 260.00 in
Tube OD 7.00 in
Contour Length 240.00 in
Tube ID 4.684 in
Rubber Cut-back
Side 1: 8.00 in
Side 2: 12.00 in
Weight 1195 lb
Material Alloy Steel
Performance Specifications
Flow Range 400-750 GPM
Rev per Unit Volume 0.32 Rev/Gal
Speed Range 129-242 RPM
No Load Pressure Loss 213 psi
  POB XTH
Max Rec Press 2,080 psi 2,230 psi
Torque @ Max Press 17,290 ft-lbs 18,530 ft-lbs
Stall Pressure 3,810 psi 4,080 psi
Stall Torque 31,650 ft-lbs 33,910 ft-lbs
Stator Minors and Fit (in) at 70°F
  XTH POB
Group Minor Fit Minor Fit
B 4.077 0.002
0 4.086 -0.007 4.087 -0.008
3 4.090 -0.011 4.093 -0.014
7 4.102 -0.023
 
Reline Lengths (in) Max 260 Min 254
Alt. Stator OD (in)   -   -
Alt. Rotor Diameter (in) - - - -

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

Torque
Differential Pressure (psi) 0 2,000 Torque (ft-lb) 0
Fit Increase
Change in Temperature (°F) 0 100 200 300 Fit Increase (in) 0
Speed
Differential Pressure (psi) 0 2,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (psi) 0 2,000 Mechanical Power (hp) 0
Torque
Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 3,000 3,500 Torque (ft-lb) 0 10,000 20,000
Fit Increase
Change in Temperature (°F) 0 50 100 150 200 250 300 Fit Increase (in) 0 0.01 0.02 0.03 0.04 0.05
Speed
400 GPM 575 GPM 750 GPM Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 3,000 3,500 Speed (RPM) 0 100 200 300
Mechanical Power
400 GPM 575 GPM 750 GPM Differential Pressure (psi) 0 500 1,000 1,500 2,000 2,500 3,000 3,500 Mechanical Power (hp) 0 200 400 600 800
©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.