WORKING PRESSURES

Maximum working pressures for Ø 28 to Ø 102 versus borehole diameter

Maximum working pressures for Ø 130 to Ø 170 versus diameter

Example of selection:

For permeability testing in a Ø 3" bore-hole (76mm). three packers' diameters are theoretically suitable: Ø 42mm, Ø 56mm or Ø 72mm. The maximum respective working pressures in a Ø 76mm bore-hole are given by the above graph:

• 40 bar (580 psi) for the Ø 42mm packer
• 80 bar (1160 psi) for the Ø 56mm packer
• 100 bar (1450 psi) for the Ø 72mm packer

The packer diameter is chosen according to the maximum working pressure needed for each application.

Do not use the packer at the limits of its expansion. Always allow a reasonable distance between the at-rest packer diameter and the bore-hole. For instance, a Ø 72mm packer should not be used in a 76mm bore-hole.