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HPT Stack Piston

Movement

Reciprocating

Static

Duty

High Pressure
High Impact

Action

Single/Double

Description:

The HPT Stack is a three piece, high pressure, double acting piston or rod seal. Specifically designed for a sliding sleeve tool and very commonly used as a VTR/ATR seal stack replacement. The HPT Stack has proven to be a superior alternative to your standard multi-v stack configurations and offers excellent adaptation possibilities for diverse temperatures and media by selection of suitable materials.

For high impact applications, such as a sliding sleeve. The shifts of the port from open to close is done by some significant force. This impact can cause catastrophic failure to the sealing lips on the individual v’s, whereas the HPT Stack has a very unique geometry, making its ability to absorb these forces quite significant.

Features:
  • Significant reduction in cost when compared with VTR/ATR Sealing Stacks
  • 3 piece design with split guiding elements enables easy installation
  • Allows for reduced groove width (min. width 1.00”, depth 0.25”)
  • Proven to operate at 15,000 psi
  • Design of sealing element with large “lead-in” reduces risk of damage while traversing ports
  • Can be incorporated into new tool design to customer specification
  • Pre-load can be modified to suit customer requirements 
Applications:
  • High pressure applications
  • Sliding sleeves
  • Frac ports
  • ATR/VTR stack replacements
  • Many more
Technical Data

Sealing Element:

Material:

Nitrile/FKM/HNBR

Material Code:

0101/0201/0120

Note: Alternative materials are available upon request

Back-up Rings:

Material:

PEEK/Unfilled PTFE

Material Code:

5001/1001

Note: Alternative materials are available upon request

Temperature:

-40°C to +204°C
-40°F to +400°F

Note: Temperature can vary depending on material chosen, as well as extrinsic factors.

Speed:

3 ft/s

Pressure:

20,000 psi

Media:

Chemical compatibility chart

Note: All parameters can vary depending on the specific application, please take the above information as a general guideline. Should you have any concerns please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it.

hpt stack1

HPT vs VTR Finite Element Analysis
VTR Stack Simulation

 

hpt stack vtr

Parameters
  • Stack retained by housing at B
  • 15,000 PSI exerted from A
  • 1000 PSI exerted from B
  • Ambient Temperature 
Materials
  • Ryton Headers
  • 2 off Moly/Glass PTFE VEE per side
  • 1 Viton 90 VEE per side
  • Viton 90 O Ring as the reversing ring 
Conclusion

Vees on side A of simulation have high stress points as expected due to pressure blow-by. Vees on side B have similar stress characteristics due to high pressure differential causing potential failure. Deformation of Vees in both directions may potentially cause failure due to fouling on ports when in operation.

HPT Stack Simulation

hpt stack simulation

Parameters
  • Stack retained by housing at B
  • 15,000 PSI exerted from A
  • 1000 PSI exerted from B
  • Ambient Temperature
Materials
  • Nitrile 90 Sealing Element with PEEK Backups
Conclusion

Minimal deformation of sealing element causes no significant stress points. Stress concentrated at face of backup.

Hardware Design Guidelines & Part Numbers

Please contact a member of our team for information regarding Hardware design guidelines for the piston HPT Stack. This email address is being protected from spambots. You need JavaScript enabled to view it.