1.Method Statement for Passivation and Pickling

YANBU II POWER & WATER PROJECT PACKAGE: 3

METHOD STATEMENT FOR PASSIVATION AND PICKLING

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YANBU II POWER & WATER PROJECT METHOD STATEMENT FOR PASSIVATION AND PICKLING

Contract PO No.: Doc No. : Rev No. :

Date of Issue:28/03/2012 Page 2 of 6

METHOD STATEMENT FOR PASSIVATION AND PICKLING

Document No.

:

Project Name

: YANBU II POWER & WATER PROJECT

Contract No.

:

Client

:

EPIC CONTRACTOR Rev

Date

Description

Prepared by

Reviewed by

Approved by

YANBU II POWER & WATER PROJECT Contract PO No.: Doc No. : Rev No. :

METHOD STATEMENT FOR PASSIVATION AND PICKLING

Plant :

Date of Issue: Page 3 of 6

Document No. :

Rev.

Title :

METHOD STATEMENT FOR PASSIVATION AND PICKLING

REV.

DATE

Project :

Project Co. :

EPC Contractor :

DESCRIPTION

BY

CHK

APP

YANBU II POWER & WATER PROJECT Contract PO No.:

METHOD STATEMENT FOR PASSIVATION AND PICKLING

Doc No. : Rev No. :

Date of Issue: Page 4 of 6

CONTENTS 1.0 SCOPE 2.0 REFERENCE DOCUMENTS 3.0 SEQUENCE 4.0 DISCRIPTION OF PASSIVATION 5.0 INSPECTION 6.0 CHEMICAL COMPOSITION OF PICKLING MATERIAL

1.0 SCOPE This method statement is covering the requirements of pickling and passivation of stainless of

YANBU II POWER & WATER PROJECT Contract PO No.: Doc No. : Rev No. :

METHOD STATEMENT FOR PASSIVATION AND PICKLING

Date of Issue: Page 5 of 6

welding joint for Riyadh PP11 Project at Saudi Arabia. 2.0 REFERENCE DOCUMENTS The contractor shall apply the most recent edition of the following applicable standard and code as a part of the specifications. American Society for Testing and Materials (ASTM) ASTM A380: “Standard Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts” 3.0 SEQUENCE 1) Degreasing 2) Passivation Treatment 3) Water Rinsing 4) Drying 5) Protection 4.0 DISCRIPTION OF PASSIVATION 4.1 Degreasing a) Cleaning shall be done after fabrication, welding and heat treatment is completed. b) Scale produced as a result of heating and forming operation shall be removed by blasting with iron free girt (all oxide), aluminum grinder, stainless steel power brush, or chemical cleaning method approved by the Buyer. Residual grit shall be completely removed by blowing with clean, dry, oil-free air or steam. c) Solvent cleaning shall be used to remove oil, grease, or other soluble foreign matter. d) Any remaining greases, oil or foreign matters shall be removed by using aceton, alcohol or solvent. 4.2 Passivation Treatment 1) Acid pickling is carried out to remove residual contaminants and oxide firms, and to obtain a clear and uniform surface by means of acid solutions. 2) All scales and contaminants shall be removed by the pickling process. 4.3 Water Rinsing Wash pickling solution with fresh until the surface is free of acid solution. 4.4 Drying The water rinsed surface shall be dried in open air or with dry. 4.5 Protection Passivation and rinsed area for austenitic stainless steel shall be wrapped to ensure protection from further contamination. 5.0 INSPECTION 1) Visual inspection shall be carried out under a bright light, minimum 1,076 Lx.

YANBU II POWER & WATER PROJECT Contract PO No.:

METHOD STATEMENT FOR PASSIVATION AND PICKLING

Doc No. : Rev No. :

Date of Issue: Page 6 of 6

2) Items cleaned in accordance with this procedure shall be free of paint, oil, grease, welding flux, slag, heat-treating and hot-forming scale, dirt, trace, metal and abrasive particles and chips, and other gross contamination. 3) Visual inspection shall be conducted with borescopes, mirrors, and other aids, as necessary, to properly examine inaccessible or difficult-to-see surfaces. 4) Inspection shall be performed by white paper test after all works have finished. 6.0 CHEMICAL COMPOSITION OF PICKLING MATERIAL 1) Pickling & Passivation of Stainless steel Degreaser: HG-700 or COOLMIN K-100 or KS-100 or equivalent

Degreaser

Brand

HG-700

KS-100

COOLMIN K-100

Chemical Composition

Kinds Nitric Acid : 15%

Potassium Hydroxide : 44%

Potassium Hydroxide :

Phosphoric acid: 10%

Sodium : Hydroxide : 6%

35% Sodium D-gluconate : 5%

Surfactant : 15%

Polymer Compound : 12%

Surfactant : 2%

Nonionic surface activator :

Sodium Nitrite : 5%

Water : 58%

35% Others : 25%

Others : 33%

Kinds

Pickling Material

Brand

LD111(spray)

Chemical Composition

(2) Pickling & Passivation material of Stainless steel: LD-111 or equivalent

Nitric Acid : 25% Hydrofluoric Acid : 7% Alkali Ion Compound : 32% Ammonium Hydrogen-fluoride : 5% Water : 31%