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7/26/2019 Api Mpms 2B
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Manual of Petroleum
Measurement Standards
Chapter 2-Tank Calibration
Section 28-Calibration of Upright Cylindrical
Tanks Using the Optical
Reference Line Method
FIRST EDITION, MARCH 1989
REAFFIRMED MAY
1996
Reaffirmed 3/2002
I
I American Society for Testing and Materials ANSVASTM D4738-88
I American National Standards Institute ANSVASTM D4738-88 I
American
Petroleum
Institute
Helping
You
Get The Job
Done Righ t?
yright American Petroleum Instituteoduced by IHS under license with API Licensee=Ecopetrol/5915281003
Not for Resale, 07/01/2005 13:08:17 MDTeproduction or networking permitted without license from IHS
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` , , ,
` ,
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7/26/2019 Api Mpms 2B
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Manual
of
Petroleum
Measurement Standards
Chapter 2-Tank Calibration
Section 2B-Calibration of Upright Cylindrical
Tanks Using the Optical
Reference Line Method
Measurement Coordination Department
FIRST EDITION, MARCH 1989
REAFFIRMED,
MAY
1996
American
Petroleum
Institute
Helping
You
Get The
J o b
Done Right?
yright American Petroleum Instituteoduced by IHS under license with API Licensee=Ecopetrol/5915281003
Not for Resale, 07/01/2005 13:08:17 MDTeproduction or networking permitted without license from IHS
1. APT PUBLICATIONS NECESSARILY ADDRESS PROBLEMS OF A
GENERAL NATURE. WITH RESPECT TO PARTICULAR CIRCUM-
STANCES, LOCAL, STATE, AND FEDERAL LAWS AND REGULATIONS
SHOULD BE REVIEWED.
2. API IS NOT UNDERTAKINGTOMEET THE DUTIESOF EMPLOYERS,
MANUFACTURERS, OR SUPPLIERS TO WARN AND PROPERLY TRAIN
AND EQUIP THEIR EMPLOYEES, AND OTHERS EXPOSED, CON-
CERNING HEALTH AND SAFETY RISKS AND PRECAUTIONS, NOR
UNDERTAKING THEIR OBLIGATIONS UNDER LOCAL, STATE, OR
FEDERAL LAWS.
3.
INFORMATION CONCERNING SAFETY AND HEALTH RISKS AND
PROPER PRECAUTIONS WITW RESPECT
TO
PARTICULAR MATERIALS
AND CONDITIONS SHOULD BE OBTAINEDFROM THE EMPLOYER, THE
MANUFACïURER OR SUPPLIER OF
THAT MATERIAL, OR
THE
MATERIAL SAFETY DATA SHEET.
4.
NOTHING CONTAINED IN ANY API PUBLICATION IS TO BE
CONSTRUED AS GRANTING ANY RIGHT, BY IMPLICATION OR
OTHERWISE, FOR THE MANUFACTURE, SALE, OR USE OF
ANY
METHOD, APPARATUS, OR PRODUCT COVERED BY LETIERS PATF..MT.
NEITHER SHOULD ANYTHING CONTAINED IN
THE
PUBLICATION
BE
CONSTRUED
AS
INSURING ANYONE AGAINST
LIABILITY
FOR
INFRINGEMENT OF LETIERS PATENT.
5.
GENERALLY, API STANDARDS ARE REVIEWED AND REVISED,
REAFFIRMED, OR WITHDRAWN AT LEAST EVERY FIVE YEARS.
ADDED TO THIS REVIEW CYCLE. THIS PUBLICATION WILL NO
LONGER BE IN EFFECTFIVEYEARS AFTER ITS PUBLICATION DATE AS
A N
OPERATIVEAPI STANDARD OR, WHERE ANEXTNSIONHAS BEEN
GRANTED, UPON REPUBLICATION. STATUS OF THE PUBLICATION
CAN BE ASCERTAINED FROM
THE
API AUTHORING DEPARTMENT
MATERIALS
IS
PUBLISHED ANNUALLY AND UPDATED QUARTERLY
BY
API,
i220
L
STREET,
N.W.,
WASHINGTON, D.C.
20005.
SOMETIMES
A ONE-TIME EXTENSION OF UP TO TWO YEARS WILL BE
[TELEPHONE
(202) 682-SWIl.
A CATALOG OF API PUBLICATIONS AND
Copyright
O
1989
American
Petroleum
institute
yright American Petroleum Institute
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FOREWORD
Chapter 2.2B of the Manual of Petroleum Measurement Srandards should
e
used in conjunction with API Standard 2550. Measuremenr and Calibration of
Upright Cylindrical Tanks. Standard 2550 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 director of the
Measurement Coordination Department, Amencan Petroleum Institute. 1220 L
Street, N.W., Washington. D.C. 20005.
iii
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oduced by IHS under license with API Licensee=Ecopetrol/5915281003Not for Resale, 07/01/2005 13:08:17 MDTeproduction or networking permitted without license from IHS
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S E C ” z ~ A l J B R A T I O N SING THE OPTIC L REFERENCEINE METHOD
5
measurements shall be repreated from the beginning
of the procedure.
When the wind’girder
is
located below the tank’s
maximum fill height, the tank circumference measure-
ments above the wind girder shall be performed by
the
MTSM.
2.2B.8
Calculation Procedure
The calculation procedure to determine the radius
of
each ring from the offset measurements and the
reference circumference measurement is presented in
Figures 3 and
4.
Once the ring radii are determined,
the capacity table shall be developed in accordance
with the procedures given in
API
Standard
2550.
2.28.9 Development of Capacity Table
he
ring circumferencedradii determined by the
ORLM
shall be used to develop the strapping table in
accordance with the procedures given in
API
Standard
2550. AI1
correction factors (for example, temperature
and tilt) shall be considered. in accordance with API
Standard 2550.
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- - ` , , ,
` , , ,
` ,
` ` , ,
` ` ` ,
` ` ` ` , , ,
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` ,
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6 CHAPTER ;-TANK CALIBRATION
CENTERUNE
FLUSH
optical
4
I
reference :
line
OUTSIDE
FLUSH
Note: Using external measurement. the calculation lo determine
internal radius
i s
performed as follows:
R ,
m ,
= R a
R ,
=
R
a - m ,
= R m , <i
=
(Ci )
- (ml u
For
n
horizontal stations.
R , = (CET) [nem, a)l /n
Similarly.
For
he bottom ring,
For he bottom of the second ring.
For
he top of the second ring.
R ? = (C/Zn) -
I I (m,
a ) l /n
R,
R
i ,
R ,
=
R t
- I :
Re3
=
RI2
t z
Where:
C =
reference outer circumference.
R
= reference outer radius bottom nng)
=
CDT.
R ] .
RIZ
=
ouler radii of second nng.
i , . i: = ring
thicknesses.
a = reference offset.
m, . m2 =
individual ring offsets-
R, reference intemal radius bottom ring)
R , ,
=
internal radius bottom of second ring).
RI
=
intemai
radius
top of second ring).
= l
A
similar calculation
shall
be performed for all other nngs.
INSIDE
FLUSH
Figure 3-Optical Reference Line Method: Determination of Internal Radius External Measurement)
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SECTION 2 ~ A l l B R A T l O N SING
THE
OPTICAL
REFERENCEINE
METHOD
7
Note: Using internal measurement. the calculation to determine
internal radius
is
performed as
follows:
RI,
-
n , =
R,-
u
R’,o= R,
rn ,
u
R’,,
[(C/2n> ]
+
IZ rn, a h
For n horizontal stations.
Similarly.
R‘,
=
[ CRn)
- i ]
IX(m2 a l/n
Where:
C = reference outer circumference.
R =
reference outer radius bottom ring)
t , =
thickness
of
bottom ring.
R,
= reference internai radius bottom ring)
u =
referenceoffset.
m,. rn, = individual ring offsets.
= C/ .
=
R
- i l .
R’,,
internal radius bottom of second ring).
R’,
=
internal
radius
top of second ring).
A
similar calculation shall
be
performed for all other rings.
CENTERUNE
FLUSH
reference ’ Tank
kntedine
OüTSlDE FLUSH
INSIDE FLUSH
Figure 4-Optical Reference Line Method: Determination of Internat Radius (Internal Measurement)
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- - ` , , ,
` , , ,
` ,
` ` , ,
` ` ` ,
` ` ` ` , , ,
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` , ,
` ,
` , ,
` - - -
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yright American Petroleum Instituteoduced by IHS under license with API Licensee=Ecopetrol/5915281003
Not for Resale, 07/01/2005 13:08:17 MDTeproduction or networking permitted without license from IHS