The LiMAR® Dual Circulating Sub is designed to provide a contingent circulating facility within a Coiled Tubing BHA when conventional circulation is inadvertently lost.

In the event that circulation is lost, a rupture disc within the Dual Circulating Sub is activated by applying pressure, thus regaining circulation. With the disc ruptured, a drop ball can be pumped down to the BHA for activating a hydraulic disconnect sub, or the secondary circulating piston within the
LiMAR® Dual Circulating Sub. The pressure at which the drop ball activates the circulating piston is determined by the number of shear screws used.

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  • To provide a contingent circulating facility within a Coil Tubing BHA


  • Selective shear pressure ratings
  • Standard Benoil rupture disc port
  • Large thru bore
  • Connection options to suit customer requirements
  • Simple, robust design ensuring ease of operation for the end user
  • Selected components QPQ treated
  • Hexagonal flats for safe make-up & break-out
  • Corrosion resistant materials
Assembly Part No. Actual OD Maximum ID Make up Length
112-1500-XXX-RX 1.500" 0.250" 7.35"
112-1687-XXX-RX 1.687" 0.437" 8.00"
112-1750-XXX-RX 1.750" 0.437" 8.00"
112-2125-XXX-RX 2.125" 0.562" 8.13"
112-2375-XXX-RX 2.375" 0.562" 8.23"
112-2875-XXX-RX 2.875" 0.937" 8.50"
112-3125-XXX-RX 3.125" 1.187" 11.06"

XXX - Last 3 digits of part number denotes connection type - Please refer to the connection code data sheet. For additional sizes or further information please contact sales

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