ERT™ Power Section Specification (Metric)
962ERT6735
244.5 mm 6:7 Lobes 3.5 Stages
Rotor Specifications
Overall Length 5016.5 mm
Avg. Diameter 136.45 mm
Contour Length 4813.3 mm
Eccentricity 10.46 mm
Major Diameter 157.38 mm
Head Diameter 149.86 mm
Head Length 203.2 mm
Weight 544 kg
Thread Form 4" API FH
Stator Specifications
Overall Length 5334.0 mm
Tube OD 244.47 mm
Contour Length 4648.2 mm
Tube ID 157.73 mm
Rubber Cut-back
Side 1: 355.6 mm
Side 2: 355.6 mm
Weight 885 kg
Material Alloy Steel
Performance Specifications
Flow Range 2271-4542 LPM
Rev per Unit Volume 0.03 Rev/L
Speed Range 61-122 RPM
No Load Pressure Loss 1441 kPa
  POB XTH
Max Rec Press 6,440 kPa 6,900 kPa
Torque @ Max Press 33,340 N-m 35,720 N-m
Stall Pressure 11,780 kPa 12,630 kPa
Stall Torque 61,010 N-m 65,370 N-m
Stator Minors and Fit (mm) at 21°C
  XTH POB
Group Minor Fit Minor Fit
0 136.07 0.38 136.07 0.38
4 136.42 0.03 136.42 0.03
5 137.01 -0.56 137.01 -0.56
 
Reline Lengths (mm) Max 5334 Min 5182
Alt. Stator OD (mm)   285.8   -
Alt. Rotor Diameter (mm) - 136.068 - 135.611

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

Torque
Differential Pressure (kPa) 0 5,000 10,000 Torque (Nm) 0
Fit Increase
Change in Temperature (°C) 0 50 100 150 Fit Increase (mm) 0
Speed
Differential Pressure (kPa) 0 5,000 10,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 5,000 10,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 10,000 Torque (Nm) 0 10,000 20,000 30,000 40,000 50,000
Fit Increase
Change in Temperature (°C) 0 20 40 60 80 100 120 140 160 180 Fit Increase (mm) 0 0.5 1
Speed
2271 LPM 3407 LPM 4542 LPM Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 10,000 Speed (RPM) 0 50 100
Mechanical Power
2271 LPM 3407 LPM 4542 LPM Differential Pressure (kPa) 0 2,000 4,000 6,000 8,000 10,000 12,000 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.