17-SAIP-50

Insp nspe ect ction ion Proc roce edur dure e 17-SAIP-50 Inspection Coverage of Cathodic Protection Deep Anode Beds Inspection Engineering Standards Committee Members

18 April 2009

Saudi Saudi Aramco Desk DeskTop Top Standards Standards Table Table of Cont ents

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Previous Issue: 31 August 2004

Scope................................. Scope............................................... ........................... ............... 2 Purpose................................. Purpose................................................ ......................... .......... 2 Abbreviations................................ Abbreviations.................. ........................... ................. .... 2 Applicable Standards and Specifications..... 2 Inspection Procedure.................... Procedure................................. ................. .... 3 Reporting Methods............................. Methods......................................... ............ 6

Next Planned Update: 18 April 2014 Page 1 of 6

Primary contact: Kakpovbia, Anthony E. on 966-3-8747226 Copyright©Saudi Aramco 2009. All rights reserved.

Document Responsibility: Inspection Engineering Standards Committee Issue Date: 18 April 2009 Next Planned Update: 18 April 2014

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17-SAIP-50 Inspection Coverage of Cathodic Protection Deep Anode Beds

Scope 1.1

This Inspection Procedure outlines inspection guidelines to be followed for the installation of Cathodic Protection Deep Anode Beds.

1.2

This SAIP is intended to establish a standardized methodology by Saudi Aramco inspection personnel in the implementation of inspection programs within Saudi Aramco facilities. The SAIP shall not be included in purchase order or contract documents issued to outside agencies.

Purpose To provide the relevant information and necessary procedures required to promote proficient and uniform inspection.

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Abbreviations SAEP

Saudi Aramco Engineering Procedure

SAIP

Saudi Aramco Inspection Procedure

SAES

Saudi Aramco Engineering Standard

SAMSS

Saudi Aramco Material System Specification

DC

Direct Current

Applicable Standards and Specifications Installation shall be inspected in accordance with, but not limited to, the requirements of the following documents: Saudi Aramco Engineering Standards SAES-X-400

Cathodic Protection of Buried Pipelines

SAES-X-600

Cathodic Protection of Plant Facilities

SAES-X-700

Cathodic Protection of Onshore Well Casings

Saudi Aramco General Instructions GI-0002.710

Mechanical Completion and Performance Acceptance of Facilities

Gl-0428.001

General Instruction Manual, C.P. Responsibilities

Saudi Aramco Engineering Procedure SAEP-1150

Inspection Coverage on Projects

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Saudi Aramco Standard Drawings

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AA-036132

Terminal Detail Cable Identification

AA-036347

20-Terminal Junction Box Details

AA-036349

3-Terminal Bond Box Details

AA-036350

2-Terminal Bond Box Details

AB-036351

Marker Plate Details

AA-036356

Aquifer Penetrating Anode Bed

AA-036378

Rectifier Installation Details (Sheets 1&2)

AA-036385

Deep Anode Bed without Anode Support Pipe

AB-036540

Junction Box Mounting Details

AA-036675

Direct Buried C.P. Cable Details

Inspection Procedure 5.1

5.2

Introduction 5.1.1

Deep anode beds are constructed vertically to depths which may approach 300 m, as determined by the specific job requirements. These beds contain carbonaceous back fill and casing along with selected anode material as specified on applicable drawings. They are constructed with a number of anodes connected in parallel, to minimize the anode-to-earth resistance.

5.1.2

Deep anode beds shall be installed in accordance with the approved Saudi Aramco Standard Drawings. The design shall be reviewed and approved prior to work commencement by the Groundwater Division of the Saudi Aramco Geological Department, Consulting Services Department, and the C.P. proponent representative.

5.1.3

Virtually all deep anode beds are irreparable once installed. It is vital that this increment of a Cathodic Protection S ystem be installed correctly.

Location 5.2.1

Deep anode beds are generally employed where surface soil resistivity is too high for normal anode bed design. Resistivity generally decreases considerably with depth.

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5.2.2

5.3

5.4


Deep anode beds shall be installed according to the respective construction drawings, using suitable equipment. Information on the maximum allowable depth of the bed shall be obtained by the project from the Hydrology Division, Geological Department, and the exact location of the bed staked.

Materials 5.3.1

Review the Scope of Work for compliance with the applicable standards and construction techniques. Check the material take-off (MTO) list against the "Approved For Construction" drawings to determine consistency and that the material meets the applicable Saudi Aramco Materials System Specifications (SAMSSs).

5.3.2

Visit the contractor lay-down yard to spot check the material on hand. If graphite anodes are to be used, they should remain boxed or a sunshade provided. Some graphite anodes are susceptible to cracking if left in direct sunlight.

5.3.3

Visually check all anodes for apparent external damage to body or lead wires. Ensure that all anodes are stored in a location where they are not subjected to physical damage.

On Site Inspection 5.4.1

From the Scope of Work, note the maximum allowable anode to cable resistance value. No anode assembly should be used that has a higher resistance than the limit set by the Scope of Work. Witness a physical "pullout" test as determined by the Scope of Work. When the anodes pass the electrical and physical tests, they are ready to be installed.

5.4.2

Determine that the bore hole is of correct depth and that the resistance readings have been taken at the specified intervals and recorded by the designated site representative. Obtain copies of these readings. The bore hole depth may be less than the maximum allowable if the drill stem resistance is at or below that required b y the Scope of Work and the depth is sufficient for proper spacing of the anodes and their required over burden.

5.4.3

Witness the holiday detection of the anode cables immediately prior to installation. Check the holiday detector according to the manufacturer's instructions and make sure that have valid calibration sticker within six month before operation and set to 18,000 volts as prescribed in SAES-X-400, 5.4.3. If a holiday is detected, the entire anode/cable assembly shall be replaced. The contractor should take Page 4 of 6



precautions to ensure that the cables are not damaged on the way down the hole. 5.4.4

Check to ensure that the DC power supplies have an operating voltage rating not more than 100 Volts.

5.4.5

Check to ensure that the DC power supplies are not installed in hazardous locations.

5.4.6

As the anodes are installed, check that they are numbered sequentially, #1 being the first down the hole and so on. Labels should be attached to the ends of the cables that will be in the anode lead junction box.

5.4.7

Check to ensure that the vent pipe has the proper number and size holes drilled in it, and goes in the hole with the anodes.

5.4.8

Observe that the spacing from the bottom of the first anode to the bottom of the hole is correct. Also, that the spacing between anodes is correct. The contractor should utilize a cable counter or other suitable means to control these dimensions.

5.4.9

After determining that the anode column is installed and supported properly as shown in the relevant drawings, ensure that the anode cable tails are coiled up and out of harms way. This is particularly important during the coke breeze slurry pumping operation, as there is a lot of activity and the cables must not be walked on.

5.4.10

Count the drums of carbonaceous back fill on site to determine that the quantity agrees with the required calculated amount, and ensure that it is all placed down the hole. If the slurry is not thoroughly agitated in the mixing tub, large quantities can settle out. Coke Breeze slurry is normally pumped from the bottom of the hole up.

5.4.11

After the hole is filled to the minimum acceptable level over the top anode, obtain the total column to structure resistance (anodes paralleled). This reading may vary after the column settles.

5.4.12

The surface casing shall have means for providing strain relief of the anode cables. Ensure that this support (see specific installation drawings for details) is in place and being used before the cables are inserted into the conduit to the anode lead junction box.

5.4.13

Refer to the Standard Drawing and "approved for construction" drawings for specific installation details concerning anode lead junction boxes.

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Reporting Methods Any deficiencies in the above mentioned methods or procedures should be reported by one of the methods outlined in SAEP-1150, Inspection Coverage on Projects, or through the worksheet system in operating plants.

18 April 2009

Revision Summary Editorial revision to change primary contact. Revised the “Next Planned Update.”

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17-SAIP-50

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