Power Section Specification
800-91027
8" 9:10 Lobes 2.7 Stages
Rotor Specifications
Overall Length 262.00 in
Avg. Diameter 4.785 in
Contour Length 254.50 in
Eccentricity 0.240 in
Major Diameter 5.265 in
Head Diameter 4.850 in
Head Length 7.50 in
Weight 1350 lb
Thread Form 3 1/2" API IF
Stator Specifications
Overall Length 270.00 in
Tube OD 8.00 in
Contour Length 254.00 in
Tube ID 6.250 in
Rubber Cut-back
Side 1: 8.00 in
Side 2: 8.00 in
Weight 1588 lb
Material Alloy Steel
Performance Specifications
Flow Range 300-900 GPM
Rev per Unit Volume 0.07 Rev/Gal
Speed Range 21-63 RPM
No Load Pressure Loss 181 psi
  POB XTH PRR
Max Rec Press 680 psi 750 psi 680 psi
Torque @ Max Press 23,250 ft-lbs 25,580 ft-lbs 23,250 ft-lbs
Stall Pressure 1,030 psi 1,130 psi 1,030 psi
Stall Torque 34,880 ft-lbs 38,360 ft-lbs 34,880 ft-lbs
Stator Minors and Fit (in) at 70°F
  PRR POB XTH
Group Minor Fit Minor Fit Minor Fit
B 4.773 0.013
T 4.756 0.029 4.760 0.026 4.760 0.026
0 4.786 -0.000 4.786 -0.000 4.786 -0.000
Reline Lengths (in) Max 270 Min 264 Alternate Stator OD (in): - / -
Torque
Differential Pressure (psi) 0 500 Torque (ft-lb) 0
Fit Increase
Change in Temperature (°F) 0 100 200 300 Fit Increase (in) 0
Speed
Differential Pressure (psi) 0 500 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 Torque (ft-lb) 0 10,000 20,000 30,000
Fit Increase
Change in Temperature (°F) 0 50 100 150 200 250 300 350 Fit Increase (in) 0 0.02 0.04 0.06 0.08
Speed
300 GPM 600 GPM 900 GPM Differential Pressure (psi) 0 100 200 300 400 500 600 700 800 900 Speed (RPM) 0 20 40 60 80
Mechanical Power
300 GPM 600 GPM 900 GPM Differential Pressure (psi) 0 200 400 600 800 1,000 Mechanical Power (hp) 0 100 200 300
©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.