Manual of Petroleum Measurement Standards Chapter 2—Tank Calibration

Section 2B—Calibration of Upright Cylindrical Tanks Using the Optical Reference Line Method

FIRST EDITION, MARCH 1989 REAFFIRMED, APRIL 2019

ADDENDUM 1, OCTOBER 2019

Date of Issue: October 2019

Affected Publication: API Manual of Petroleum Measurement Standards, Chapter 2.2B, Calibration of Upright Cylindrical Tanks Using the Optical Reference Line Method, First Edition, March 1989

Addendum 1

Foreword:

In the first paragraph, replace “API Standard 2550” with “API MPMS 2.2A.”

Section 2.2B.1:

In the first paragraph, replace “API Standard 2550” to “API MPMS 2.2A.”

Section 2.2B.2:

In the first and second paragraphs, replace “API Standard 2550” with “API MPMS 2.2A.”

Section 2.2B.4:

In the second paragraph, replace “API Standard 2550” with “API Manual of Petroleum Measurement Standards, Chapter 2.2A.”

Section 2.2B.6:

In the second paragraph, replace “API Standard 2550” with “API MPMS 2.2A.”

Section 2.2B.7.1:

In the first paragraph, replace “API Standard 2550” with “API MPMS 2.2A.”

Section 2.2B.7.4:

In the second paragraph, replace “API Standard 2550” with “API MPMS 2.2A.”

Section 2.2B.7.4:

In the eighth paragraph [item g)], replace “measurements shall be repreated” with “measurements shall be repeated.”

Section 2.2B.8:

In the first paragraph, replace “API Standard 2550” with “API MPMS 2.2A.”

Section 2.2B.9:

In the first paragraph, replace “API Standard 2550” with “API MPMS 2.2A.”

Special Notes

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Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. Sometimes, a one-year extension of up to two years will be added to this review cycle. This publication will no longer be in effect five years after its publication date as an operative API standard or, where an extension has been granted, upon republication. Status of the publication can be ascertained from the API authoring department [telephone (202) 682- 8000]. A catalog of API publications and materials is published annually and updated quarterly by API, 1220 L Street, NW, Washington, DC 20005.

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Copyright © 1989 American Petroleum Institute

Foreword

Chapter 2.2B of the Manual of Petroleum Measurement Standards should be used in conjunction with API MPMS 2.2A, Measurement and Calibration of Upright Cylindrical Tanks. API MPMS 2.2A is currently being revised and will eventually be published as Chapter 2.2A of the Manual of Petroleum Measurement Standards.

API publications may be used by anyone desiring to do so. Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them; however, the Institute makes no representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any federal, state, or municipal regulation with which this publication may conflict.

Suggested revisions are invited and should be submitted to the Standards Department, API, 1220 L Street, NW, Washington, DC 20005, standards@api.org.

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Contents

Page

2.2B.1 Introduction 1

2.2B.2 Scope 1

2.2B.3 Definitions 1

2.2B.4 Referenced Publications 1

2.2B.5 Significance 1

2.2B.6 Equipment 1

2.2B.7 Optical Calibration Procedure 2

2.2B.7.1 Tank Status Before Calibration 2

2.2B.7.2 Preparation 2

2.2B.7.3 Instrument Verification 2

2.2B.7.4 Calibration Procedures 2

2.2B.8 Calculation Procedure 5

2.2B.9 Development of Capacity Table 5

Figures

1. Tank Plan (Shown for Eight Horizontal Stations) 3

2. Tank Elevation 4

3. Optical Reference Line Method: Determination of Internal Radius (External Measurement) 6

4. Optical Reference Line Method: Determination of Internal Radius (Internal Measurement) 7

Table

1 Tank Diameter Versus Minimum Number of Horizontal Stations 2

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