CORR-RAD 

 ENGINEERING AND MARKETING

Pioneers in Pipeline Protection

CATHODIC PROTECTION - SUPPLY

1.     CATHODIC PROTECTION EQUIPMENTS

2.     CATHODIC PROTECTION INSTRUMENTS

1. SUPPLY OF EQUIPMENTS:

A. FOR IMPRESSED CURRENT CATHODIC PROTECTION SYSTEM:

a. TRANSFORMER RECTIFIER UNITS

 The Automatic Cathodic Protection unit is a compact, floor mounted, self contained, indoor/outdoor, natural air cooled/oil cooled: sheet steel unit. The unit has a front lockable door on which all indicating meters, lamps and controls are mounted. A careful layout of the power circuit and the control circuit inside the unit provides access to all components, enabling easy maintenance. The control circuit of the unit is assembled on plug-in type cards for easy servicing.

230 Volts single phase AC input and 50 Volts, 50 Amps, D.C Output, Manual / AVCC/ Automatic output controlled, Air-cooled, outdoor pedestal mounted type

 OUTSTANDING FEATURES:

        Three modes of operation

        Multi- reference feedback

        Unique fail-safe features

        Extremely fast auto control response

        Highly functional annunciation system

        Built-in overcurrent protection. 

b. ANODES AND ACCESSORIES

SILICON CHROMIUM CAST IRON ANODES:

1.      Impressed Current Cathodic Protection System is an efficient, economical and reliable method of protecting underground pipelines / structures from external corrosion on   long term basis

         High-Silicon-Chromium iron due to its inherent property of excellent     resistance to corrosion is being very widely used as " Anodes in Cathodic Protection  System".

 2.    Normal Composition :

            Silicon                        : 14 - 16%

Chromium                   : 4 - 6%

Carbon                        : 1.2% max

Manganese                : 0.85% max

1.   Ultimate tensile strength                               :    15000 PSI

Compressive strength                                  :    10000 PSI

Hardness                                                       :       500 BHN

Density                                                           :     7 GMS / CC

Specific Resistance                                     :    72 micro ohm cm at 20º  c

Co-efficient of expansion                             :     7.33 x 10 -6

2. Results of short term test of impressed current on High Silicon  - Chromium iron anodes in synthetic sea water at 25 Amp / m² current  density with constant air bubble agitation at Indian Institute of Technology  - Mumbai

Although anodes can be made of convenient sizes in terms of "Surface area to volume Ratio", the following sizes are readily available.

      50 mm dia x 750 mm long x 75 mm encapsualtion dia                  10.8 kgs.

      50 mm dia x 1000 mm long x 75 mm encapsulation dia                14.5 kgs.

      50 mm dia x 1550 mm long x 75 mm encapsulation dia                22.5 kgs.

      62 mm dia x 1000 mm long x 75 mm encapsulation dia                22.5 kgs. 

     75 mm dia x 1000 mm long x 75 mm encapsulation dia                 30.0 kgs.

1. For making Anode to tail cable connection suitable silver plated copper

connectors are available 

2. Centre connected tubular anodes are readily available in the following size

         50 mm I.D. X 75 mm O.D. X 1500 mm length, weighing 25 kg.

         This comes with our specially designed lead connector.

c. ANODE JUNCTION BOX

Anode Junction Box for horizontal anode ground bed shall be suitable and has the facility for :

- 1 incoming header cable

- 16 nos of circuit .

- 3 spare terminals for future use.

d. PERMANENT REFERENCE ELECTRODES

The permanent reference electrodes will be used for reference pipe to soil potential measurement for automatic control for permanent cathodic protection of various pipelines. It shall be Cu-CuSO4 type. Copper sulphate shall be of chemical grade. It should be non-polarising and should have the lowest possible internal resistance.

Cu/CuSO4 type or zinc reference electrode shall be used.

The cell shall be connected with reference cable and the cap shall be completely incapsulated with araldite for perfect insulation.

The reference cell shall be installed nearer to the pipeline and cable shall be connected to the proper terminal of the rectifier unit / test station.

e. CABLES

Stranded bare copper conductor PVC insulated GI wire armored PVC sheath cables of 650  / 1100 V Grade as per following specifications

a. 1 core 16 sq mm cable shall be used for main anode and cathode connections

b. 4 core 2.5 sq mm cable shall be used for test stations permanent pipe to soil measurement system for T.R.Unit and earthing.

c. 1 core 10 sq mm unarmored cable shall be used for anode tail cable.

f. INSULATING FLANGES

Insulating material shall be provided at all flanges where pipeline goes above ground and at all tap off points.

g. MISCELLANEOUS EQUIPMENT

All materials / equipments shall be of reputed and approved makes.

 B. FOR CATHODIC PROTECTION SYSTEM BY SACRIFICIAL ANODES METHOD: 

1. MAGNESIUM ANODES

High Manganese, magnesium alloy anodes, metallurgical composition shall conform to the following specifications :

Composition Of Backfill Chemical

2. ZINC ALLOY ANODES FOR CATHODIC PROTECTION ( 11 LBS TYPE )

Zinc anodes conform to the following specifications :

Composition Of Backfill Chemical

 SUPPLY OF CP INSTRUMENTS

The following are available with us for sale as and when required.

1. 4 PIN MEGGER
2. SINCORDER
3. CURRENT INTERRUPTER
4. PEARSON DETECTOR
5. HOLIDAY DETECTOR
6. LEAK DETECTOR.

QUARTZ CRYSTAL CONTROLLED

CURRENT INTERRUPTER

THE DIGITALLY CONTROLLED CURRENT INTERRUPTER

WITH EXACT TIMING RANGES HAS 60 AMPS CAPACITY

Corr-Rad’s all new quartz crystal controlled current interrupter allows synchronization of two or more current interrupters at separate Cathodic Protection Rectifier stations. The same accuracy can be expected as found in the high quality Quartz wrist watches. Simply select the desired time interval on the two digit digital display and start the unit.  THE MODEL QC WILL CONTINUOUSLY CYCLE PRECISELY.

The model QC Current Interrupter timing span extends from 0 to 99 seconds in exact one second increments for both the ON time as well as the OFF time.  The timing is easily selectable by a two button selector which also doubles as the start and stop switch for the interrupter.

The DIGITALLY CONTROLLED SYSTEM WHICH IS COMPLETELY SOLID STATE assures a long useful life under extreme field conditions.  Sixty hours of continuous use from a 12V 7AH maintenance free rechargable battery.  The instrument is housed in a rugged HEAVY DUTY ABS enclosure designed for easy battery access and a protective cover for the panel controls.

 SPECIFICATIONS

DELIVERY –                  From stock complete with battery, ready to operate.

TIMING RANGE –        Continuously selectable timing from 0 to 99 seconds ON

                                          Continuously selectable timing from 0 to 99 seconds OFF

RATINGS –                    DC 60 Amps – 26 Volts resistive load

                                          AC 50 Amps – 120 Volts resistive load

                                          AC 25 Amps  - 240 Volts resistive load

BATTERY -                    Optional - One 12 Volt 7AH Maintenance Free Rechargable Battery

DIMENSIONS –            179MM X 280MM X 129MM

Corr-Rad Engineering & Marketing

Gita 92, Sion East, Mumbai 400022. Tel : 91- 22- 2401 0308 / 31016711

Fax : 91- 22- 2401 0308, E-mail : corr_rad@vsnl.com

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