Polatrak ROV-II Operation Manual Download

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Deepwater Corrosion Services Inc.

13813 FM 529 Rd, Houston, TX 77041 USA

+1 (713) 983 7117

Email: [email protected]

polatrak.com

Corrosion testing probes

SMB-009 ROV-II Manual Rev. 1

2016 Deepwater Corrosion Services Inc. Specifications subject to change without notice

ROV-II™

CP probe

Operation manual

Twin reference

electrodes for

online calibration

Can be used with

ROVs or as a

diver-held probe

Works as either

a contact or

proximity probe

Use with Polatrak

Deep C Meter™

for subsea readout

Summary of Contents for ROV-II

Page 1: ...robes SMB 009 ROV II Manual Rev 1 2016 Deepwater Corrosion Services Inc Specifications subject to change without notice ROV II CP probe Operation manual Twin reference electrodes for online calibration Can be used with ROVs or as a diver held probe Works as either a contact or proximity probe Use with Polatrak Deep C Meter for subsea readout ...

Page 2: ...tion 8 6 1 Wet check 8 6 2 Recording cathodic protection potentials 8 7 Taking cathodic protection potential readings 9 8 Data interpretation 9 9 Maintenance and repair 10 9 1 Tip replacement 10 9 2 Reference electrode element replacement 10 10 Troubleshooting 11 List of figures Figure 1 Soft splicing the whip onto the comms cable 4 Figure 2 SEA CON RMG 3FS connector pin diagram 7 Figure 3 Identif...

Page 3: ...rovided with the ROV II The case can be filled with seawater so that the probe can be calibrated T handle probe mounts are available for use with ROVs There s a stainless steel version above right with a shock absorber to protect the probe during stabbing and another made of Delrin so inspection class ROVs can handle their weight Both are available with fish tail handles SEA CON RMG 3FS connector ...

Page 4: ...e subsea end In our experience the most suitable cable is the four 4 conductor armored spiral comms cable used by most divers for diver communications it has two twisted pairs and is very rugged A whip with this connector is provided with the probe and should be soft spliced onto the end of the comms cable see Fig 1 Ensure that the connection is taped back to the armored wire to provide strain rel...

Page 5: ...ed directly into a video annotator with an input imped ance of at least 1 MΩ 4 3 Cautionary notes Polatrak sintered silver silver chloride reference electrode elements are designed to be rugged but they are consumables that have a given operational life The life of these electrodes can be extended to several seasons if the following care is taken 4 3 1 Never allow the electrode elements to be dire...

Page 6: ...protection levels Other causes include one or more defective reference cell electrodes wire damage within the probe or mud that has gotten inside the probe Calibration can be used to quickly diagnose a defective reference electrode or cable damage and should be performed before during and after every use NOTE Company calibration specifications must be met but we strongly advise also using the at t...

Page 7: ...uickly detect any cable damage Diver surveys using the ROV II probe should have two topside multimeters connected to the dive cable ROV assisted surveys should have the Polatrak Deep C Meter along side the probe to provide a subsea LED readout of the voltages Wiring schematics for these two options can be seen in Figures 7 8 CAUTION NEVER submerge any unmated Seacon connectors 5 4 1 While the prob...

Page 8: ...ore than 3 mV check the platform ground wire connection 6 Operation Most companies have their own survey procedures to follow The following guidelines are given as guidance only 6 1 Wet check 6 1 1 When interfaced to an ROV it s important to perform a wet check before every dive Sig nal errors caused by umbilical power cable interference could introduce reading errors 6 1 2 With the probe wired to...

Page 9: ...eadings are within the range specified in Table 1 See troubleshooting section if problems persist NEVER operate the system with any of the connectors un mated unless the dummy plugs are installed 8 Data interpretation For carbon steel structures in seawater the readings obtained should be within the ranges in Table 1 Exceptions may occur if the probe is stabbed onto an isolated section of a corros...

Page 10: ...connector 9 2 2 Perform a zinc coupon bucket calibration as described in section 5 3 4 The faulty elec trode will be the one that gives the more positive reading 9 2 3 Ensure that the probe is drained of seawater 9 2 4 Take the probe unit to a clean area 9 2 5 DO NOT handle the small electrode pellet with bare hands 9 2 6 Remove the two screws securing the tail unit and gently pull out the tail un...

Page 11: ...ir can be made using ScotchKote sealant not included and splicing tape How ever prolonged operation in this manner is not recommended Order a new nose cone assembly as soon as possible 10 3 Recalibration After any replacement or repair recalibrate the instrument by performing a bucket calibration as described in section 5 3 Table 2 Troubleshooting quick guide Symptom Possible problem Action Instru...

Page 12: ...ual 12 SMB 009 ROV II Manual Rev 1 Figure 4 Cell to Zn coupon ROV II calibration wiring schematic Calibration voltmeter display at 2 Volts DC setting Seawater solution Non metallic bucket Step VE VE DC scale Expected result 01 Tip Pin 1 Reference electrode 2 Pin 3 2 V 1 030 to 1 070 02 Tip Pin 1 Reference electrode 1 Pin 2 2 V 1 030 to 1 070 Zn calibration coupon Readings should be within 0 005V o...

Page 13: ... to change without notice ROV II operation manual 13 SMB 009 ROV II Manual Rev 1 Figure 5 Cell to cell ROV II calibration wiring schematic Calibration voltmeter display at 200 mV DC setting Seawater solution Non metallic bucket Step VE VE DC scale Expected result 01 Pin 3 Reference electrode 1 Pin 2 200 mV 5 0 mV 02 Pin 2 Reference electrode 2 Pin 3 200 mV 5 0 mV ...

Page 14: ...o Ag AgCI master ROV II calibration wiring schematic Calibration voltmeter display at 200 mV DC setting Seawater solution Non metallic bucket Step VE VE DC scale Expected result 01 Master Reference electrode 1 Pin 2 200 mV 0 mV 5 0 mV 02 Master Reference electrode 2 Pin 3 200 mV 5 0 mV 03 Master Tip Pin 1 2 V 3 V 0 1 V Ag AgCI master electrode Note This calibration procedure is only performed by q...

Page 15: ...il sales stoprust com 2016 Deepwater Corrosion Services Inc Specifications subject to change without notice ROV II operation manual 15 SMB 009 ROV II Manual Rev 1 Figure 7 Wiring for diver assisted platform survey ROV II wiring schematic Survey voltmeter display at 2 Volts DC setting ...

Page 16: ... 2016 Deepwater Corrosion Services Inc Specifications subject to change without notice ROV II operation manual 16 SMB 009 ROV II Manual Rev 1 Figure 8 Wiring for Deep C Meter readout ROV II wiring schematic SEA CON connector Pin 1 Contact tip Pin 2 Reference electrode 1 R1 Pin 3 Reference electrode 2 R2 ...

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