ISO TR 07507-6-1997.pdf

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TECHNICAL

REPORT

ISO/TR

7507-6

First edition

1997-11-01

Petroleum and liquid petroleum products —

Calibration of vertical cylindrical tanks —

Part 6:

Recommendations for monitoring, checking and

verification of tank calibration and capacity table

Pétrole et produits pétroliers liquides — Jaugeage des résevoirs cylindriques

verticaux —

Partie 6: Recommandations relatives à la surveillance, au contrôle et à la

vérification du jaugeage des réservoirs et des tables de jaugeage

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Reference number

ISO/TR 7507-6:1997(E)

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ISO/TR 7507-6:1997(E)

Contents

Page

Scope.............................................................................................

Normative reference ......................................................................

Definitions ......................................................................................

Recalibration and recalculation......................................................

Criteria for deciding significance of change ...................................

Recalibration of the tank ................................................................

Recalculation of the tank capacity tables due to operational

changes .........................................................................................

Annexes

Tank shell temperature determination ...........................................

Bibliography .................................................................................

or utilized in any form or by any means, electronic or mechanical, including photocopying and

microfilm, without permission in writing from the publisher.

International Organization for Standardization

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ISO

ISO/TR 7507-6:1997(E)

Foreword

ISO (the International Organization for Standardization) is a worldwide

federation of national standards bodies (ISO member bodies). The work of

preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which

a technical committee has been established has the right to be represented

on that committee. International organizations, governmental and non-

governmental, in liaison with ISO, also take part in the work. ISO

collaborates closely with the International Electrotechnical Commission

(IEC) on all matters of electrotechnical standardization.

The main task of technical committees is to prepare International

Standards, but in exceptional circumstances a technical committee may

propose the publication of a Technical Report of one of the following types:

— type 1, when the required support cannot be obtained for the

publication of an International Standard, despite repeated efforts;

— type 2, when the subject is still under technical development or where

for any other reason there is the future but not immediate possibility of

an agreement on an International Standard;

— type 3, when a technical committee has collected data of a different

kind from that which is normally published as an International Standard

(“state of the art”, for example).

Technical Reports of types 1 and 2 are subject to review within three years

of publication, to decide whether they can be transformed into International

Standards. Technical Reports of type 3 do not necessarily have to be

reviewed until the data they provide are considered to be no longer valid or

useful.

ISO/TR 7507-6, which is a Technical Report of type 2, was prepared by

Technical Committee ISO/TC 28,

Petroleum products and lubricants,

Subcommittee SC 3,

Static petroleum measurement.

It was decided to publish this document in the form of a Technical Report

(type 2) in order to gain wider experience with the use of the recommen-

dations. It is envisaged that, when ISO 7507-1 is reviewed, that these

recommendations will be included in it and this Technical Report withdrawn.

ISO 7507 consists of the following parts, under the general title

Petroleum

and liquid petroleum products — Calibration of vertical cylindrical tanks:

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—

Part 1: Strapping method

Part 2: Optical-reference-line method

Part 3: Optical-triangulation method

Part 4: Internal electro-optical distance-ranging method

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iii

Not for Resale

ISO/TR 7507-6:1997(E)

ISO

—

Part 5: External electro-optical distance-ranging method

Part 6: Recommendations for monitoring, checking and verification of

tank calibration and capacity table

Annex A forms an integral part of this part of ISO 7507. Annex B is for

information only.

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ISO

ISO/TR 7507-6:1997(E)

Introduction

Vertical cylindrical tanks are a type of tank in general use throughout the

world for the storage of petroleum and petroleum products. Measurement

of liquid levels and the use of the tank's capacity table permit the

assessment of volume of the liquid held in store or transferred. Vertical

cylindrical tanks, in common with other measurement devices, are subject

to alterations in their calibration. Previously, such alterations were

considered insignificant and their magnitude had never been seriously

assessed. This part of ISO 7507 is based on the results of an investigation

carried out in the United States of America ([1] in annex B).

Data currently available indicates that tanks are subject to a primary

settlement which generally occurs during the first 5 years to 10 years of

service. Secondary settlement can also occur but appears to spread over

the next 10 years to 20 years of the tank's life. Tanks can undergo gradual

changes in diameter, tank plate thickness and tilt throughout their service

life. These factors affect the calibration of the tank and consequently the

accuracy of any quantity assessments made using the tank capacity

tables.

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