ERT™ Power Section Specification
669ERTcr5682
6.688 5:6 Lobes 8.2 Stages
Rotor Specifications
Overall Length 233.00 in
Avg. Diameter 3.702 in
Contour Length 226.00 in
Eccentricity 0.335 in
Major Diameter 4.371 in
Head Diameter 4.000 in
Head Length 7.00 in
Weight 683 lb
Thread Form 2.750 NOIHT
Stator Specifications
Overall Length 246.00 in
Tube OD 7.00 in
Contour Length 224.00 in
Tube ID 4.360 in
Rubber Cut-back
Side 1: 11.00 in
Side 2: 11.00 in
Weight 1048 lb
Material Alloy Steel
Performance Specifications
Flow Range 450-750 GPM
Rev per Unit Volume 0.40 Rev/Gal
Speed Range 180-300 RPM
No Load Pressure Loss 190 psi
  POB XTH
Max Rec Press 2,110 psi 2,260 psi
Torque @ Max Press 14,540 ft-lbs 15,580 ft-lbs
Stall Pressure 3,860 psi 4,140 psi
Stall Torque 26,610 ft-lbs 28,510 ft-lbs
Stator Minors and Fit (in) at 70°F
  XTH POB
Group Minor Fit Minor Fit
1 3.706 -0.004 3.706 -0.004
 
Reline Lengths (in) Max 246 Min 240
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 5,000 10,000 15,000 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
450 GPM 600 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
450 GPM 600 GPM 750 GPM Differential Pressure (psi) 0 1,000 2,000 3,000 Mechanical Power (hp) 0 200 400 600 800 1,000
©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.