WELDED STEEL TANKS INSPECTION

WELDED STEEL TANKS INSPECTION

0. INTRODUCTION

This Standard specification gives the amendments and supplements to API standard 650, Tenth Edition Nov. 1998 with Addendum 1, January 2000 and Addendum 2, November 2001 “welded steel tanks for oil storage”

It is intended that API standard together with this Standard shall be used for “welded steel tanks for oil storage” for use in oil refineries, chemical plants, gas plants and where applicable, in exploration and production and new ventures.

For ease of reference, the clause or section numbering of API standard 650 has been used throughout this Standard.

All Clauses in API standard 650 that are not mentioned here in this Standard remain unaltered and shall be considered as part of this Standard.

Guidance for use of this Standard:

The following annotations as specified here under, have been used at the bottom right hand side of each clause or paragraph to indicate the type of change made to the equivalent clause or paragraph of reference standards.

Sub. (Substitution): The API standard clause is deleted and replaced by a new clause.

Del. (Deletion): The API standard clause is deleted without any replacement.

Add. (Addition): A new clause with a new number is added.

Mod. (Modification): Part of the API standard clause is modified and/or a new description and/or condition is added to that clause.

1. SCOPE

1.1 General

1.1.1 Atmospheric storage tanks are those designed to operate at ambient temperature and above and from 0.6 kPa (6mBar) vacuum up to 5.6 kPa (56mBar=22in H2O). (Mod)

1.1.2 This standard covers atmospheric storage tanks with fixed (cone and dome) and floating (pontoon and double deck) roofs. Storage tanks with internal floating roof are not covered here. (Mod)

1.1.3 International system of unit (SI) in accordance with XXX and appendices X & Y of this standard shall be used wherever reference is made to API/ASME or shall be substituted by any other standard equivalent SI unit system for dimensions, fasteners and flanges. (Sub)

1.4 Referenced Publications

Throughout this Standard the following standards, in addition to the referenced codes and standards mentioned in API standard 650, are referred to. The editions of these standards and codes that are in effect at the time of publication of this Standard shall, to the extent specified herein, form a part of this Standard. The applicability of changes in standards and codes that occur after the date of this Standard shall be mutually agreed upon by the Company and the Vendor. (Mod)

BSI (BRITISH STANDARDS INSTITUTION)

BS 2654 “Manufacture of vertical steel welded non-refrigerated storage tanks with butt welded shell for petroleum industry”

ASME (AMERICAN SOCIETY OF MECHANICAL ENGINEERS)

ASME B1.1 “Unified Inch Screw Threads”

ASSE (AMERICAN SOCIETY OF SAFETY ENGINEERS)

ASSE A14.3 “Safety Requirements for Fixed Ladders”

1.5 Conflicting Requirements

In case of conflict between documents relating to the inquiry or purchase order the following priority of documents, shall apply:

- First priority: purchase order (including attachments) and variations thereto.

- Second priority: data-requisition sheets and drawings.

- Third priority: this specification

All conflicting requirements shall be referred to the purchaser in writing. The purchaser will issue conforming documentation if needed for clarification.

WELDED STEEL TANKS INSPECTION -will be continued

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