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Table T2. Summary of instrumentation originally installed in ODP CORKs.

Leg/Hole Type/Year Pressure Temperature Fluid sampling Data logger Comments
139/857D CORK/1991 P1 20-conductor cables by CCC, with thermistors assembled by CCC 1/2 inch FEP tubing on temperature string RBR 12 bit temperature, 24 bit pressure, 1 h sampling Thermistor cables and sample tubing failed early at high temps
139/858G 1/2 inch PFA tubing on temperature string
146/889C CORK/1992 P1 20-conductor CCC cable with specified breakouts, thermistors assembled by PIs in grease-filled Teflon capsule (5 x 5/8 inch diameter) None RBR 12 bit temperature, 24 bit pressure, 12 bit tilt, 1 h sampling Most sensors failed on deployment in bad weather
146/892B Cable folded 4 times for short hole; worked well until failure at 1.5 y when hydrates froze in hole
156/948D CORK/1994 Integrated string with 3 PaineR gauges + 20 Pt RTD sensors, all with serial transmission of digital signals None Institut Francais de Recherche pour l'Exploration de la Mer, 1 h sampling String worked well but CORK body did not seal
156/949C CORK/1994 P2 20-conductor CCC cable; 10 thermistors in OD "GEO-01-01" epoxy casting attached by PIs 1 downhole OS RBR 12 bit temperature, 24 bit pressure, 1 h sampling Long cable folded twice to fit shorter hole; sensors failed below second fold; OS unit never recovered
168/1024C
168/1025C
168/1026B
168/1027C		 CORK/1996 P2 10-thermistor NT cable with MAW-2 connectors molded at breakouts; thermistors molded by SC in MAW-2 connectors assembled by PIs 1 downhole OS near bottom of each cable RBR 13 bit temperature, 24 bit pressure, 1 h sampling except for brief periods at higher rates 3 cables field-shortened by reterminating at top; cables worked well; 2 OS units recovered in 1999 but hole collapsed around other 2 OS units
169/857D
169/858G		 CORK/1996 P2 Cables as for 1992 CORKs in Holes 889C/892B None RBR 13 bit temperature, 24 bit pressure, 1 h sampling except for brief periods at higher rates Cables failed within months due to high temps
174B/395A CORK/1997 P2 Cables as for 1996 CORKs in Holes 1024C/1025C/1026B/1027C None RBR 13 bit temperature, 24 bit pressure, 1 h sampling except for brief periods at higher rates Borehole pressure readings flawed in least significant bits for undetermined reasons







195/1200C CORK/2001 P2 Recycled cable recovered from Hole 1024C in 1999 2 downhole OS RBR 13 bit temperature, 24 bit pressure, 1 h sampling except for brief periods at higher rates Cable folded multiple times; most conductors failed; OS units recovered 2003
196/1173B ACORK/2001 P6 None 1 special 1/8 inch stainless steel tube to manifold RBR no temperature, 24 bit pressure, 10 min sampling Instrumentation working well despite other installation flaws
196/808I P7
—/504B Wireline CORK/2001Roger Revelle P2 36-conductor cabling by South Bay Cable; OD encapsulated thermistors installed by PIs Special hydraulic tubing to manifold RBR 24 bit temperature at 1 h sampling, 24 bit pressure at 10 min sampling 504B installation worked well; logging at both sites terminated at ~1 y for unclear reasons (seawater leakage?)
—/896A P3
205/1253A CORK-II/2002 P3 Memory temperature loggers by Antares 2 downhole OS RBR 24 bit seafloor temperature at 1 h sampling, 24 global bit pressure at 10 min sampling OS and Antares units recovered and replaced 2004; worked well
205/1255A 1 downhole OS

Notes: For pressure monitoring in single-seal CORKs: P1 = single Paroscientific Digiquartz gauge in sealed interval, P2 = P1 plus second Paroscientific Digiquartz gauge for seafloor reference. For later multizone models: P# = seafloor reference gauge plus n = # – 1 Paroscientific Digiquartz gauges on seafloor manifold registering pressures of n zones. CCC = Cortland Cable Co., RBR = Richard Brancker Research, Ltd., NT = Neptune Technologies, OD = Ocean Design Inc., SC = Brantner/SeaCon. FEP and PFA are grades of Teflon. OS = OsmoSampler.

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