PtPSI Onshore Pipeline Impressed Current

8/3/2019 PtPSI Onshore Pipeline Impressed Current

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1.0 SCOPE

This specification shall govern the design, materials procurement, installation and

inspection requirements of Cathodic protection system for the steel pipe used as onshore

pipelines. The Work includes the furnishing all labor, materials, tools and equipment

and the performance of all operations, and incidentals necessary for the design and

installation of the system.

As used in this specification, the following definitions shall apply :

COMPANY - UNOCAL INDONESIA COMPANY

CONTRACTOR - PT. ASRI UTAMA TECHNICAL SERVICES

Cathodic Protection System Designer/Installer

CONTRACTOR shall obtain COMPANY written approval for any deviations fromthe requirements of this specification, applicable standards and referenced drawings.

This document is not intended to be all inclusive, and the use of the guidelines set forth

does not relieve the CONTRACTOR of his responsibility to complete the WORK.

2 0 CODES AND STANDARD



2 0 CODES AND STANDARD

3.2 Design Criteria

(a) The proposed of the Cathodic protection system is to protect the steel pipe

from external corrosion due to electrolyte and oxygen present surrounding

the pipe for a period of not less than 20 years.

(b) The Cathodic protection system for this steel pipe shall be an impressed

current type with a deep ground bed anode which

should be compatible with

existing C.P systems and with existing buried structures along the pipe route.

(c) The impressed current shall capable to supply current and DC Voltage

required by the pipe to maintain the potential of the pipe to the soil more

negative than - 850 mV versus copper/copper sulphate (Cu/Cu SO4)

reference cell.

(d) Facilities shall be included to monitor the effective operation of the system.

3.3 Impressed Current Cathodic Protection System

(a) Pipeline to be protected :

Total length : Refer to the drawing attached in the bid

document/contract

Material : API5L X52



(c) Anode ( + ) Junction Box :

Enclosure : Cast Aluminum enclosure , with IP 55 minimum rating.

Common DC Bus : Shall be designed to carry 100 Amperes of DC current

continuous , material Copper with Insulation post that

may with stand 2 KV DC test for 2 minutes.

The Terminal lug shall be minimum No: 50 sqmm

Branch Circuits : shall be designed to accommodat

e 10 circuits maximum ,

complete with 50mV/50A DC Shunt for each

circuit and No: 8AWG ( or 10 sqmm ) terminalLugs or equal.

(d) Cathode ( Negative ) Junction Box :

Enclosure : Cast Aluminum enclosure , with IP 55 minimum rating.

Common DC Bus : Shall be designed to carry 100 Amperes of DC current

continuous , material Copper with Insulation post that

may with stand 2 KV DC test for 2 minutes.

The Terminal lug shall be minimum No: 50 sqmm

Branch Circuits : shall be designed to accommodate maximum 5 circuits

complete with 50mV/50A DC Shunt for each

circuit and No: 1/0AWG ( or 50 sqmm ) terminal

Lugs or equal.

( ) DC C bl



(g) Transformer Rectifier

Type : Outdoor Type , oil filled with Shell Diala B

transformer Oil , Caltex BSI or equal.

Input voltage : 240 VAC/50 Hz , single phase or otherwise stated in the

detailed Engineering Drawing.

Output voltage : DC , adjustable voltage (coarse and fine)

Current interuptor : Adjustable time set-up

Metering : Analog Ampere meter and Analog DC Voltmeter

Lightning Protection : Both the DC side and the AC side of the Transformer

Rectifier shall be equipped with Surge / Lighting

Protection Overvoltage with minimum capacity as

follows :

- DC side : 100 KA

- AC side : 25 KA.

(h) Current Span Test Station :

Type :

Minimum span :

Requirement :

Wire size :

Four (4) wires per pipeline (see Attachment 2)

200 feet

Two (at both side of rectifier connection)

12 AWG ( or 4 sqmm minimal , single conductor,

d t l d d i l ti ith



4.2 Inspection and Approval

During installation of the system, all aspects of the installation process shall be made

available for inspection by COMPANY or its Representative. Any

equipment assembly not meeting the requirements of a this specification or

referenced documents may be rejected. Rejected assemblies are to be

dismantled and reassembled in compliance with the requirements of this

specification at CONTRACTOR expense.

5.0 INSTALLATION OF THE ELECTRICAL CONNECTIONS AND MONITORING

POINTS

5.1 Test Point Station :

One (1) electrical lead wire minimum shall be used for testing , and shall be installed

at every 500 m of pipeline. The size of the lead shall be at least 6 AWG or 25 sqmm

( single standed copper wire with HMWPE , N2XY_CV_XLPE/PVC insulationor equal The installation is to be typically as is shown at Attachment 3.

5.2 Current Spa

n Test Station :

Four (4) electrical lead wires used for corrosion control or current span measurement

shall be installed at each section of the pipeline at the location within COMPANY’s

Ri ht f W ( ROW ) Th i f l d i h ll b t l t 12 AWG 4



Cap Brand or equal epoxy encapsulation kit.

5.4 Corrosion Coat Repair

After the leads have been installed, the weld area shall be thoroughly cleaned with a

wire brush. All steel surfaces, including the pipe, bonding plates, etc., exposed for

welding purposes shall be repaired in accordance with General Specification for

Pipeline Corrosion Coating. Damage to the pipe corrosion coat for any reason shall

be repaired in accordance with COMPANY General Specification for Pipeline

Corrosion Coating.

5.5 Inspection and Approval

During installation of the current span and test point leads, all aspects of the

installation process shall be made available for inspection by COMPANY or its

Representative. Any lead assembly not meeting the requirements of this

specification or referenced documents may be rejected. Rejected assemblies are to

be dismantled and reassembled in compliance with the requirements of this

specification at CONTRACTOR expense.

6.0 INSPECTION OF THE CATHODIC PROTECTION SYSTEM

U l ti f th i l i th th di t ti t h ll b i t d d



UI-GS-OPLCP

2 of 5 Rev. B



UI-GS-OPLCP

3 of 5 Rev. B



UI-GS-OPLCP

4 of 5 Rev. B



UI-GS-OPLCP

5 of 5 Rev. B

PtPSI Onshore Pipeline Impressed Current

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