ERT™ Power Section Specification (Metric)
962ERTcr7848
244.5 mm 7:8 Lobes 4.8 Stages
Rotor Specifications
Overall Length 5981.7 mm
Avg. Diameter 143.80 mm
Contour Length 5753.1 mm
Eccentricity 8.96 mm
Major Diameter 161.72 mm
Head Diameter 139.70 mm
Head Length 228.6 mm
Weight 674 kg
Thread Form 2 7/8" API Reg
Stator Specifications
Overall Length 6273.8 mm
Tube OD 244.47 mm
Contour Length 5638.8 mm
Tube ID 166.14 mm
Rubber Cut-back
Side 1: 317.5 mm
Side 2: 317.5 mm
Weight 1041 kg
Material Alloy Steel
Performance Specifications
Flow Range 2271-4542 LPM
Rev per Unit Volume 0.03 Rev/L
Speed Range 63-127 RPM
No Load Pressure Loss 1572 kPa
  POB XTH
Max Rec Press 9,150 kPa 9,800 kPa
Torque @ Max Press 44,710 N-m 47,900 N-m
Stall Pressure 16,750 kPa 17,940 kPa
Stall Torque 81,820 N-m 87,660 N-m
Stator Minors and Fit (mm) at 21°C
  XTH POB
Group Minor Fit Minor Fit
0 143.56 0.24 143.56 0.24
1 143.76 0.04 143.76 0.04
4 144.32 -0.52 144.32 -0.52
7 144.78 -0.98 144.78 -0.98
 
Reline Lengths (mm) Max 6274 Min 6121
Alt. Stator OD (mm)   285.8   -
Alt. Rotor Diameter (mm) - 143.053 - -

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 Torque (Nm) 0
Fit Increase
Change in Temperature (°C) 0 50 100 150 Fit Increase (mm) 0
Speed
Differential Pressure (kPa) 0 10,000 Speed (RPM) 0
Mechanical Power
Differential Pressure (kPa) 0 10,000 Mechanical Power (Kw) 0
Torque
Differential Pressure (kPa) 0 5,000 10,000 15,000 Torque (Nm) 0 20,000 40,000 60,000
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 5,000 10,000 15,000 Speed (RPM) 0 50 100 150
Mechanical Power
2271 LPM 3407 LPM 4542 LPM Differential Pressure (kPa) 0 5,000 10,000 15,000 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.