ERT™ Power Section Specification
675ERTcr7829
6.75" 7:8 Lobes 2.9 Stages
Rotor Specifications
Overall Length 213.50 in
Avg. Diameter 3.808 in
Contour Length 206.50 in
Eccentricity 0.244 in
Major Diameter 4.296 in
Head Diameter 4.000 in
Head Length 7.00 in
Weight 637 lb
Thread Form 2 7/8" API Reg
Stator Specifications
Overall Length 220.00 in
Tube OD 6.75 in
Contour Length 204.00 in
Tube ID 4.528 in
Rubber Cut-back
Side 1: 8.00 in
Side 2: 8.00 in
Weight 820 lb
Material Alloy Steel
Performance Specifications
Flow Range 300-650 GPM
Rev per Unit Volume 0.16 Rev/Gal
Speed Range 47-102 RPM
No Load Pressure Loss 231 psi
  POB XTH
Max Rec Press 800 psi 860 psi
Torque @ Max Press 13,460 ft-lbs 14,420 ft-lbs
Stall Pressure 1,470 psi 1,570 psi
Stall Torque 24,640 ft-lbs 26,400 ft-lbs
Stator Minors and Fit (in) at 70°F
  XTH POB
Group Minor Fit Minor Fit
0 3.812 -0.004 3.812 -0.004
2 3.827 -0.019 3.827 -0.019
5 3.829 -0.021 3.829 -0.021
7 3.839 -0.031 3.839 -0.031
 
Reline Lengths (in) Max 220 Min 214
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) 0 500 1,000 Torque (ft-lb) 0
Fit Increase
Change in Temperature (°F) 0 100 200 300 Fit Increase (in) 0
Speed
Differential Pressure (psi) 0 500 1,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (psi) 0 500 1,000 Mechanical Power (hp) 0
Torque
Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 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
300 GPM 475 GPM 650 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 Speed (RPM) 0 50 100
Mechanical Power
300 GPM 475 GPM 650 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 1,200 1,400 Mechanical Power (hp) 0 100 200 300 400
©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.