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Referrence Standard
DRAFT INTERNATIONAL STANDARD ISO/DIS 15589-2
ISO/TC 67/SC 2 Secretariat: NEN
Voting begins on Voting terminates on 2001-09-27 2002-02-27
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Petroleum and natural gas industries — Cathodic protection for pipeline transportation systems — Part 2: Offshore pipelines
Industries du pétrole et du gaz naturel — Protection cathodique pour systèmes de transport par conduites — Partie 2: Conduites en mer
ICS 75.200
I S O / C E N P A R A L L E L E N Q U I R Y The CEN Secretary-General has advised the ISO Secretary-General that this ISO/DIS covers a subject of interest to European standardization. In accordance with subclause 5.1 of the Vienna Agreement, consultation on this ISO/DIS has the same effect for CEN members as would a CEN enquiry on a draft European Standard. Should this draft be accepted, a final draft, established on the basis of comments received, will be submitted to a parallel two-month FDIS vote in ISO and formal vote in CEN.
To expedite distribution, this document is circulated as received from the committee secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au Secrétariat central de l'ISO au stade de publication.
In accordance with the provisions of Council Resolution 15/1993 this document is circulated in the English language only.
Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué en version anglaise seulement.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
© International Organization for Standardization, 2001
ISO/DIS 15589-2
© ISO 2001 – All rights reserved 13
gas holes and porosities shall be limited to maximum 2 % of the total cut surface area, and maximum 5 % of any individual cut surface area;
non-metallic inclusions shall be limited to maximum 1 % of the total cut surface area and maximum≤ 2 % of any individual cut surface area;
lack of bond (voids) shall be limited to maximum 10 % of the total tubular insert circumference and maximum 20 % of the circumference for any individual cut.
Bracelet anodes should be sectioned transversely and/or longitudinally by single cuts at 25 % and 50 % of nominal length, or at other agreed locations for a particular anode design. The cut faces, when examined visually without magnification, shall conform to the following criteria:
gas holes and porosities shall be limited to maximum 2 % of the total cut surface area, and maximum 5 % of any individual cut surface area;
non-metallic inclusions shall be limited to maximum 1 % of the total cut surface area and maximum 2 % of any individual cut surface area;
lack of bond (voids) adjacent to the insert shall be limited to maximum 10 % of the total insert perimeter and maximum 20 % of any individual cut.
The insert position within the anode shall be confirmed by measurement on the cut faces and conformed to specified requirements.
9.9 Electrochemical quality control testing
The following shall be tested:
closed circuit potential;
consumption rate;
visual examination of corrosion pattern (uneven consumption, intergranular attack, etc.).
One set of tests shall be carried out for each 15 tonnes of anodes produced. The electrochemical test data shall be included in the material certificate.
The closed circuit potential and the capacity shall comply with the criteria stated in Table 8. Alternative criteria derived from data obtained on testing of anode performance under specific operating conditions may be used. The test procedure should be according to annex C or equivalent. Testing shall be carried out in natural seawater or artificial seawater according to ASTM D1141 at representative temperatures.
Table 8 —Requirements to electrochemical performance (production testing) at all current densities
Anode type Electrochemical Capacity
Average (Ah/kg)
Closed circuit potential,
mV (Ag/AgCl Seawater)
Aluminium 2600a -1070
Zinc 780 -1030
a Single values of min. 2500 Ah/kg are acceptable.
ISO/DIS 15589-2
© ISO 2001 – All rights reserved 9
8.4 Aluminium anode materials
The aluminium anode material should be of the Al-Zn-In type. The chemical composition of the anodes shall be formulated to meet the potential and current capacity requirements of the project design. A typical chemical composition known to perform well in many conditions is given in Table 6. Other compositions may be used if testing demonstrates they meet the required anode performance. Caution should be used when any element falls outside the specified range, as anode performance may be less than the design requires.
Table 6 —Typical chemical composition of aluminium anode materials
Elementa Min. % Max. %
Zn 2,5 5,75
In 0,016 0,040
Fe - 0,09
Si 0,08 0,12
Cu - 0,003
Cd - 0,002
others 0,02 (each)
Al Remainder
a Under certain operating conditions such as deep water (>500m), cold water it may be necessary to select a narrower anode composition range than given in this table in order to obtain the required anode performance.
8.5 Zinc anode materials
A typical chemical composition of the zinc material is as follows:
Table 7 — Typical chemical composition of zinc anode materials
Element Min % Max %
Cu - 0,005
Al 0,10 0,50
Fe - 0,005
Cd 0,025 0,07
Pb 0,006
Zn Remainder
MelLng Furnace 1 BlasLng 2
Core Blowing Machine 5 Leak Test 6
Fasilitas Pabrik
PainLng 1 Thermocouple 2
MulLmeter 4 Spectrometer 5
Fasilitas Pabrik
Core Box
1
Mould
2
MelLng Proses
3
4 6
Proses Pembuatan Produk
5
Pengecekan Thermocouple Pouring Solidifikasi
Pengecekan dimensi
7
Pengecekan Berat
8
Uji Potensial
10
Uji Komposisi
9
Proses Pembuatan Produk
Uji Banding Tes Spectrometer
QC Sheet
NO : TGL : JUMLAH : KgDAPUR NO :
A. MATERIAL MASUK
JUMLAH
KgKggr
B. PROSES PELEBURAN
JAM
CATATAN :
OPERATOR : SUPERVISOR :
KETERANGAN
KETERANGAN
No. Dok :FK-7.4-16
Date : Revisi :
5678 Pouring / Casting
Pengambilan SampleMasukan IndiumTes Temperatur II ˚C
URAIANNO.
1234 Tes Temperatur I ˚C
Pemasukan ZincPemasukan Bahan AluminiumPemanasan Dapur
NAMA BAHAN
Ingot Aluminium TypeZinc IngotIndium
NO.
123
PELEBURAN ANODA ALUMINIUMMaterial 1. √ Al
Series No. 2. Zn
3. Mg
A. Dimensi & Berat
L T Berat (kg)
140 130 24,7 Kg
140 130 24,7 Kg
140 130 24,7 Kg
140 130 24,7 Kg
140 130 24,7 Kg
140 130 24,7 Kg
140 130 24,7 Kg
140 130 24,7 Kg
140 130 24,7 Kg
140 130 24,7 Kg
140 130 24,7 Kg
140 130 24,7 Kg
B. Anode Potential
1
12
0001
0012
-1150 mV
-1150 mV
425
0010
0009
0008
0007 425
425
425
425
425
425
425
425
425
425
425
0002
0003
0004
0005
0006
0012
0011
7
8
9
10
11
12
1
2
3
4
5
6
No. Dok : FK-8.2.4-04-01
Date : 12 / 09 / 2017
Revisi :
Specimen No. Batch No.
P
Anode Quality Control
: Al / Zn / Mg
:
Potential
mVolt/Ag AgCl
Sample No. Batch No.
0001
PEMERIKSAAN MUTU ANODA ALUMINIUM
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