Data sheet 120

Electrical Resistance (ER)Probes

CORROSION MONITORING PROBES

Features and AdvantagesElectrical resistance (ER) probes measurecorrosion rates as an increase in electricalresistance over time for a steel element inthe probe face. The increase in electricalresistance is proportional to theaccumulated corrosion in the exposureperiod.

The probes may be used in allrelevant environments, such as oil, waterand gas.

CorrOceans wide range of probedesigs and probe types let you choose theappropriate probe type and elementthickness depending on the application(corrosivity and required response time).

A special High Sensitivity ER probehas been developed for inhibitor testingor other situations where rapid responseis required (see data sheet 124).

Other EquipmentProbe data may be acquired by means ofthe hand held data acquisition terminalMultiCorr (see data sheet 155).

An system for continuous corrosionmonitoring is usually much more useful,and requires the use of CorrOceansMultiLog system (see data sheet 158). Thelogger can be off line (use MultiCorr toretreive data) or on-line using either 4-20mA current loop or CorrOceansproprietary FieldBus system (see datasheet 151).

The CorrOcean ER probes can beused both with CorrOceans patentedhydraulic access and retrieval system andwith any traditional 2" system.

REPRO AFlush Mounted ER Probe with Spiral ElementThe spiral design of the REPRO A allows thicksensing elements with an acceptable sensitivity. Thisgives the REPRO A considerably longer service lifethan traditional ER probes. The probe isrecommended for use where high corrosion ratesare expected, or where inspection is more sporadic.REPRO A probes are available both with fixed andadjustable length.

REPRO BFlush Mounted ER Probe with Strip ElementThe strip design of the REPRO B gives a highsensitivity. However, the probes service life will beshorter than for the REPRO A. The probe is thereforerecommended for use where corrosion rates areexpected to be low to moderate. REPRO B probesare available both with fixed and adjustable length.

TUBULAR T10 and T20Electrical Resistance Probes with Tubular ElementThe tubular probe design provides very goodsensitivity combined with good temperaturestability, as the probes reference element is locatedwithin the tubular element.

Protective shields for the tubular element areavailable and are supplied in the same material asthe probe element in order to avoid galvanic effects.

High Sensitivity ER ProbeThe high sensitivity ER probe (HS-ER) fromCorrOcean utilizes both optimized element designand instrument features. The HS-ER probe has beendeveloped to be a tool for activities like inhibitortesting. Its rapid response makes it an alternativeto electrochemical probes (see data sheet 124).

Other Probe DesignsAlternative probe designs are available fromCorrOcean, such as the projecting Repro C probe,designed for long life under extreme conditions.Please consult your nearest CorrOcean office formore information.

Subsea ER ProbesER probes for subsea erosion or corrosionmonitoring is a CorrOcean speciality. Contact yourCorrOcean dealer for more information.

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Technical SpecificationsConnector type:Pressure rating:Temperature rating:

Testing:

Body material:

Element material:Probe diameter:Probe packing:

How to order:Please state: Probe type Part number Probe length information

You do not need to use complicated formulas forlength calculations. CorrOcean will calculate therequired length based on a few simple facts - seeback page.

6 pin, 14S-6P, Amphenol420 bar (6090 psi)93 oC 1)at 420 bar(200F/6090psi)Tested at maximum pressureand temperature ratingAISI 316L(6Mo or Duplex on request)Carbon steel St 52-3N32 mm (1.26)Included

1)Temperature limit varies with pressure. For system temperaturesabove 93 C (200F) please contact CorrOcean

Probe typeProbe typeProbe typeProbe typeProbe type

Repro A

Repro B

Repro C

Tubular T10Tubular T20Tubular T30High Sensitivity ER-Probe

ElementElementElementElementElement

Flush SpiralFlush SpiralFlush SpiralFlush StripFlush Strip

Projecting spiralProjecting spiralTubularTubularTubularFlush Horseshoe

Element ThicknessElement ThicknessElement ThicknessElement ThicknessElement Thickness

1.0 mm / 39 mils2.0 mm / 79 mils4.0 mm / 157 mils0.25 mm / 10 mils0.5 mm / 19 mils

1.0 mm / 39 mils0.5 mm / 19 mils0.25 mm / 10 mils0.51 mm / 20 mils0.76 mm / 30 mils100 m / 4 mils

Part NumberPart NumberPart NumberPart NumberPart Number- Fixed length- Fixed length- Fixed length- Fixed length- Fixed length13000-L2)

13002-L2)

13001-L2)

13047-L2)

13046-L2)

13010-L2)

13011-L2)

13073-L2) 4)

13100-L2) 4)

13107-L2) 4)

13122-L2)

Part NumberPart NumberPart NumberPart NumberPart Number- Adjustable length- Adjustable length- Adjustable length- Adjustable length- Adjustable length13041-A3)

13042-A3)

13043-A3)

13049-A3)

13048-A3)

N/AN/AN/AN/AN/A13122-A3)

2)L in part number denotes the probe length in mm. Please refer to figures and formulas on last page for calculation of length.3)A in part number denotes the probe length interval for probes with adjustable length. See table below.4)For high temperature purposes, tubular probes can be delivered in a welded version. Welded tubular probes have bodies in carbon steelSt52-3. P/N is the same as above, but a W is added to the number, e.g. 13073W-L. Please contact CorrOcean for further information.

Available length intervals for adjustable probes:

Ordering Information

A1: 055 - 075 mmA2: 065 - 085 mmA3: 085 - 115 mm

A4: 110 - 150 mmA5: 150 - 190 mmA6: 190 - 230 mm

A7: 230 - 270 mmA8: 270 - 310 mmA9: 310 - 350 mmA10: 350 - 390 mmAccessories

DescriptionDescriptionDescriptionDescriptionDescriptionProtective shield for tubular probe T10Protective shield for tubular probe T20

MaterialMaterialMaterialMaterialMaterialCarbon steel St52-3

Carbon steel St52-3

Part NumberPart NumberPart NumberPart NumberPart Number13082

13088

Spare PartsThe primary packing must be replaced every time the plug is retrieved and reinstalled in the access fitting.

Spare PartSpare PartSpare PartSpare PartSpare PartProbe PackingPrimary PackingO-ring for probe shaft

MaterialMaterialMaterialMaterialMaterialGlass filled PTFEGlass filled PTFEViton

Part NumberPart NumberPart NumberPart NumberPart Number11554

1150525758

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CorrOcean ASATeglgrden7485 Trondheim, NorwayTel.: +47 73 82 50 00Fax: +47 73 82 50 50mail@corrocean.nowww.corrocean.com

CorrOcean Inc3300 Walnut Bend LaneHouston, Texas 77042, USATel.: +1 713 334 2222Fax: +1 713 266 0172info@corrocean.com

CorrOcean, RomeVia Tiburtina, 147000131 Roma, ItalyTel.: +39 06 4129 4201Fax: +39 06 4129 4198info@corrocean.it

Calculating Coupon Holder And Probe LengthFor coupon holders and probes used in flareweldor flanged access fittings; hydraulic or mechanical,the length L is calculated by CorrOcean based onthree easy steps.

When ordering, this information is required foreach fitting or tag no. Use Order Details Form 001to specify details. If you have any questions, pleasecontact your nearest CorrOcean representative.

1st Step: Position MONITORING POSITION, the position of the probe inthe pipe. Top of the line indicates that theprobe does not intrude (flush with pipe wall),while bottom of the line indicates that theprobe extends to the opposite pipe wall(irrespective of fitting position).

2 nd Step: Type of fitting 3. Flanged, for mechanical retrieval4. Flanged, for hydraulic retrieval

Position information consists of twoparts:FITTING POSITION, the position of the

fitting on the pipe, described as aclock position. 12 oclock (top) or 6oclock (bottom) are the mostcommon.

For most applications, the type of fittingwill be one out of four options:1. Flareweld, for mechanical retrieval2. Flareweld, for hydraulic retrieval

12

6

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If other types of fittings are used, this must be specifically indicated.

3 rd Step: MeasurementsALWAYS REQUIRED: OUTSIDE PIPE DIAMETER WALL THICKNESS ADITIONALLY, for flanged fittings: GASKET GAP(determined by flange pressure rating) DISTANCE FROM TOP OF FLANGETO OUTSIDE OF PIPE WALL

2.1. 3. 4.

Flareweld calculations include an assumed weld gapof 1.6 mm (0.063) (NORSOK standard). Indicate ifIf actual weld gap is known to be different.