ERT™ Power Section Specification
500ERTcr7826
5" 7:8 Lobes 2.6 Stages
Rotor Specifications
Overall Length 220.00 in
Avg. Diameter 2.747 in
Contour Length 214.00 in
Eccentricity 0.174 in
Major Diameter 3.095 in
Head Diameter 2.750 in
Head Length 6.00 in
Weight 324 lb
Thread Form 2 3/8" HEF
Stator Specifications
Overall Length 229.25 in
Tube OD 5.00 in
Contour Length 213.00 in
Tube ID 3.365 in
Rubber Cut-back
Side 1: 8.12 in
Side 2: 8.12 in
Weight 600 lb
Material Alloy Steel
Performance Specifications
Flow Range 150-300 GPM
Rev per Unit Volume 0.27 Rev/Gal
Speed Range 40-80 RPM
No Load Pressure Loss 187 psi
  POB XTH
Max Rec Press 720 psi 770 psi
Torque @ Max Press 7,140 ft-lbs 7,650 ft-lbs
Stall Pressure 1,320 psi 1,410 psi
Stall Torque 13,070 ft-lbs 14,000 ft-lbs
Stator Minors and Fit (in) at 70°F
  XTH POB
Group Minor Fit Minor Fit
0 2.736 0.011 2.740 0.007
3 2.756 -0.009 2.760 -0.013
 
Reline Lengths (in) Max 229 Min 223
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 Torque (ft-lb) 0 2,000 4,000 6,000 8,000 10,000
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
150 GPM 225 GPM 300 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 Speed (RPM) 0 50 100
Mechanical Power
150 GPM 225 GPM 300 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 Mechanical Power (hp) 0 50 100 150
©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.