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US 12,165,784 B2Granted
Method for injecting strand-blocked cable
AssigneeNovinium, Inc.
InventorsWeston Philips Chapin Ford, Norman E. Keitges, James Steele
Life of this patent
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Abstract
A method for rejuvenating a strand-blocked cable having a conductor comprised of a plurality of conductor strands with interstitial volume therebetween blocked by a PIB based strand-block mastic, the conductor being surrounded by a polymeric cable insulation. The method including pre-injection of compressed gas into the conductor strands of the cable at a pressure less than the elastic limit of the cable insulation, and injection of a rejuvenation fluid into the conductor strands of the cable at a pressure less than the elastic limit of the cable insulation.
Claims17
A method for rejuvenating a strand-blocked cable, comprising:
- a. positioning a longitudinally strand-blocked cable having a conductor comprised of a plurality of conductor strands with interstitial volume therebetween longitudinally blocked by a polyisobutylene (PIB) based strand-block mastic and surrounded by a polymeric cable insulation to receive injection of a compressed carbon dioxide gas into the interstitial volume of the strand-blocked cable at a first cable location along the strand-blocked cable;
- b. next, injecting the compressed gas into the interstitial volume of the strand-blocked cable at a pressure that opens a continuous flow path along a length of the strand-blocked cable extending between the first cable location and a longitudinally separated second cable location along the strand-blocked cable and expand the continuous flow path by altering the physical properties and/or structure of the PIB based strand-block mastic through which a rejuvenation fluid can be injected to treat the strand-blocked cable, the pressure being less than the elastic limit of the cable insulation;
- c. after the continuous flow path is formed by the injection of the compressed gas, depressurizing at least a portion of the strand-blocked cable;
- and
- d. after depressurizing the portion of the strand-blocked cable, injecting the rejuvenation fluid into the conductor strands of the strand-blocked cable along the continuous flow path at a pressure less than the elastic limit of the cable insulation.
2 more elements
A method for rejuvenating a strand-blocked cable, comprising:
- a. positioning a longitudinally strand-blocked cable having a conductor comprised of a plurality of conductor strands with interstitial volume therebetween longitudinally blocked by a polyisobutylene (PIB) based strand-block mastic and surrounded by a polymeric cable insulation to receive injection of a compressed carbon dioxide gas into the interstitial volume of the strand-blocked cable;
- b. next, injecting the compressed gas into the interstitial volume of the strand-blocked cable at a pressure that opens a continuous flow path along a length of the strand-blocked cable by altering the physical properties and/or structure of the PIB based strand-block mastic through which a rejuvenation fluid can be injected to treat the strand-blocked cable, the pressure being less than the elastic limit of the cable insulation;
- c. after the continuous flow path is formed by the injection of the compressed gas, depressurizing at least a portion of the strand-blocked cable;
- d. repeating steps b and c at least one additional time to expand the continuous flow path by further altering the physical properties and/or structure of the PIB based strand-block mastic through which a rejuvenation fluid can be injected to treat the strand-blocked cable, the pressure being less than the elastic limit of the cable insulation;
- and
- e. after repeating steps b and c at least one additional time, injecting the rejuvenation fluid into the conductor strands of the strand-blocked cable along the continuous flow path at a pressure less than the elastic limit of the cable insulation.
3 more elements
A method for rejuvenating a strand-blocked cable, comprising:
- a. positioning a longitudinally strand-blocked cable having a conductor comprised of a plurality of conductor strands with interstitial volume therebetween longitudinally blocked by a polyisobutylene (PIB) based strand-block mastic and surrounded by a polymeric cable insulation to receive injection of a compressed carbon dioxide gas into the interstitial volume of the strand-blocked cable;
- b. next, injecting the compressed gas into the interstitial volume of the strand-blocked cable at a pressure that opens a continuous flow path along the entire length of the strand-blocked cable and expand the continuous flow path by altering the physical properties and/or structure of the PIB based strand-block mastic through which a rejuvenation fluid can be injected to treat the strand-blocked cable, the pressure being less than the elastic limit of the cable insulation;
- c. after the continuous flow path is formed by the injection of the compressed gas, depressurizing the entire length of the strand-blocked cable;
- and
- d. after depressurizing the entire length of the strand-blocked cable, injecting the rejuvenation fluid into the conductor strands of the strand-blocked cable along the continuous flow path at a pressure less than the elastic limit of the cable insulation.
2 more elements
Dependencies are inferred from the claim text.