EN ISO 7278-2:1995
(Main)Liquid hydrocarbons - Dynamic measurement - Proving systems for volumetric meters - Part 2: Pipe provers (ISO 7278-2:1988)
Liquid hydrocarbons - Dynamic measurement - Proving systems for volumetric meters - Part 2: Pipe provers (ISO 7278-2:1988)
Provides guidance for the design, installation and calibration of these provers. Calculation techniques for use when calibrating and operating provers are detailed in ISO 4267-2. Most of the material is general in that it applies to provers for use with different liquids and types of meters and for proving them in different services. Does not apply to the newer "small volume" or "compact" provers.
Flüssige Kohlenwasserstoffe - Dynamische Messung - Prüfsysteme für volumetrische Meßgeräte - Teil 2: Rohrprüfer (ISO 7278-2:1988)
1.1 Dieser Teil von ISO 7278 behandelt Konstruktion, Installation und Kalibrierung von Rohrprüfern. Die Berechnungstechniken für das Kalibrieren und den Betrieb von Prüfern werden in ISO 4267-2 detailliert beschrieben. 1.2 Dieser Teil von ISO 7278 ist größtenteils allgemein gehalten im Hinblick auf Rohrprüfer, die bei unterschiedlichen Flüssigkeiten und Meßgerät-Typen benutzt und bei unterschiedlichen Betriebsabläufen geprüft werden können. Dieser Teil der Norm ISO 7278 bezieht sich nicht auf die neueren "Kleinvolumen" oder "Compact"Prüfer.
Hydrocarbures liquides - Mesurage dynamique - Systèmes d'étalonnage des compteurs volumétriques - Partie 2: Tubes étalons (ISO 7278-2:1988)
1.1 La présente partie de l'ISO 7278 donne des indications concernant la conception, l'installation et l'étalonnage des tubes étalons. Les calculs techniques nécessaires pour l'étalonnage et l'utilisation des tubes étalons sont détaillés dans l'ISO 4267-2. 1.2 La plupart des sujets abordés dans la présente partie de l'ISO 7278 sont de nature générale : ils s'appliquent aux tubes étalons destinés à être utilisés pour différents liquides et avec différents types de compteurs pour permettre un étalonnage dans différentes conditions de service. Cette méthode ne s'applique pas aux «petits volumes» ou appareils de vérification «compact» de conception récente. 1.3 Les conditions de référence pour la mesure des produits pétroliers sont la température à 15 °C et la pression égale à 101 325 Pa, telles que mentionnées dans l'ISO 5024.
NOTE -- Dans certains pays, d'autres températures de référence sont utilisées (par exemple 20 °C et 60 °F).
Tekoči ogljikovodiki - Dinamična meritev - Sistemi za overjanje volumetrov - 2. del: Naprave za overjanje cevovodov (ISO 7278-2:1988)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-1998
7HNRþLRJOMLNRYRGLNL'LQDPLþQDPHULWHY6LVWHPL]DRYHUMDQMHYROXPHWURYGHO
1DSUDYH]DRYHUMDQMHFHYRYRGRY ,62
Liquid hydrocarbons - Dynamic measurement - Proving systems for volumetric meters -
Part 2: Pipe provers (ISO 7278-2:1988)
Flüssige Kohlenwasserstoffe - Dynamische Messung - Prüfsysteme für volumetrische
Meßgeräte - Teil 2: Rohrprüfer (ISO 7278-2:1988)
Hydrocarbures liquides - Mesurage dynamique - Systemes d'étalonnage des compteurs
volumétriques - Partie 2: Tubes étalons (ISO 7278-2:1988)
Ta slovenski standard je istoveten z: EN ISO 7278-2:1995
ICS:
75.180.30 Oprema za merjenje Volumetric equipment and
prostornine in merjenje measurements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
ISO
INTERNATIONAL STANDARD
7278-2
First edition
1988-12-15
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION
ORGANISATION INTERNATIONALE DE NORMALISATION
MEXJ/YHAPOJJHAFl OPTAHM3A~Mfl I-IO CTAH,4APTM3A~MM
Liquid hydrocarbons - Dynamit measurement -
Proving Systems for volumetric meters -
Part 2:
Pipe provers
S ystkmes d% talonnage des comp teurs
Hydrocarbures liquides - Mesurage dynamique -
volume triques
Partie 2: Tubes t+talons
Reference number
ISO 7278-2 : 1988 (E)
ISO 7278-2 : 1988 (El
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards bodies (ISO member bodies). T.he work of preparing International
Standards is normally carried out through ISO technical committees. Esch 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, govern-
mental 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
International Standard ISO 7278-2 was prepared by Technical Committee ISO/TC 28,
Petroleum produc ts and lubrican ts.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
0 International Organkation for Standardkation, 1988
Printed in Switzerland
ii
ISO 7278-2 : 1988 (EI
Page
Contents
.........................................................
0 Introduction
..........................................
1 Scope and field of application
2 References .
3 Definitions. .
................................................
4 Description of Systems
....................................
5 Essential Performance requirements.
6 Equipment .
7 Design of pipe provers .
8 Installation .
9 Calibration .
Annexes
............................. 15
A The use of pipe provers with four detectors
........ 18
Example of the calculation of the design Parameters of a pipe prover
B
Figures
..........................
1 Typical unidirectional return-type prover System
....................
2 Typical bidirectional straight-type Piston prover System
.........................
3 Typical bidirectional U-type sphere prover System
..............
4 Simultaneous use of two counters with a four-detector prover
...................
5 Temnorarv connection of counters to measure nl and n7
. . .
Ill
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INTERNATIONAL STANDARD ISO 7278-2 : 1988 (E)
Dynamit measurement -
Liquid hydrocarbons -
Proving Systems for volumetric meters -
Part 2:
Pipe provers
1.2 Most of the material in this part of ISO 7278 is general in
0 IntroductioF
that it applies to pipe provers for use with different liquids and
types of meters and for proving them in different Services. This
Pipe provers are used as volume Standards for the calibration of
liquid meters. The purpose of this part of ISO 7278 is to outline part of ISO 7278 does not apply to the newer “small volume” or
“compact” provers.
the essential elements of a pipe prover, to provide speci-
fications for its Performance, and to give guidance on its
design, installation and calibration. Pipe provers discussed in
1.3 The Standard reference conditions for Petroleum
this part of ISO 7278 are of the running-start/running-stop
measurement are a temperature of 15 OC and a pressure of
type, in which flow is uninterrupted during proving, thus
101 325 Pa as specified in ISO 5024.
permitting the meter to be proved under its normal operating
conditions. This type of prover includes a calibrated section of
NOTE - In some countries other reference temperatures are used,
pipe in which a displacer travels, actuating detection devices e.g. 20 OC and 60 OF.
which produce electrical Signals as the displacer Passes each
end of the calibrated Portion. The displacer finally Stops at the
end of the run as it enters a region where the flow bypasses it.
2 References
ISO 2715, Liquid h ydrocarbons - Volumetric measurement b y
Both stationary and mobile provers may be constructed on this
turbine me ter s ys tems.
principle. The calibrated section of the prover may be straight
or folded (U-shaped), and the design may be such that the
ISO 4267-2, Petroleum and liquid Petroleum products -
displacer moves around a closed loop in only one direction
Calcula tion of oil quantities - Part 2: Dynamit
(unidirectional) or, alternatively, in both directions
measuremen t. 1)
(bidirectional) .
ISO 5024, Petroleum liquids and gases - Measuremen t -
ISO 7278 consists of the following Parts, under the general title
Standard reference conditions.
Liquid h ydrocarbons - D ynamic measuremen t - Pro ving
s ys tems for volume tric me ters :
ISO 7278-3, Liquid hydrocarbons - Dynamit measurement -
Proving s ystems for volumetric meters - Part 3: Pulse
- Part 7: General principles
in terpola tion techniques.
- Part 2: Pipe provers
ISO 8222, Petroleum measurement Systems - Calibration -
- Part 3: Pulse in terpolation techniques
Tempera ture corrections for use with volumetric reference
measuring s ystems.
Annex A forms an integral part of this part of ISO 7278.
Annex B is for information only.
3 Definitions
1 Scope and field of application For the purposes of this part of ISO 7278, the following
definitions apply:
1.1 This part of ISO 7278 provides guidance for the design,
Calculation 3.1 base volume: The volume of a prover calibrated
installation and calibration of pipe provers.
techniques for use when calibrating and sperating provers are section, i.e. the length between the detectors, at specified
detailed in ISO 4267-2. reference conditions of temperature and pressure.
1) At present at the Stage of draft.
ISO 7278-2 : 1988 (El
a) The manual-return unidirectional prover is an elemen-
3.2 K-factor: The ratio of the number of electrical pulses
tary form of in-line prover which uses a section of Pipeline
emitted by a meter during a proving run to the volume of liquid
as the prover section. The entire metered stream may flow
passed through the meter.
continuously through the prover even when the prover is
not being used for proving. Detectors are placed at selected
of the actual volu me of a liquid
3.3 meter factor: The ratio
Points which define the calibrated volume of the prover sec-
passed throu gh a meter to the volume indicated the meter.
bY
tion. A displacer launching device is upstream of the prover
section, and receiving facilities are installed at some Point
calibration : The procedure for determining the downstream of the prover section. Usually, conventional
34 prover
base volume of a prover. launching and receiving scraper traps are used for this pur-
pose. To make a proving run, a displacer (a sphere or
specially designed Piston) is launched, allowed to traverse
proof: The determination of the meter factor
3.5 proving;
the calibrated section, received downstream and then
or K-factor.
manually transported back to the launching site.
3.6 range: The differente between the highest and the
b) The automatic-return unidirectional (endless loop)
lowest values within a batch of results.
prover has evolved from the prover described in 4.2.1 a) and
is shown in figure 1. In this endless loop, the piping is
arranged so that the downstream end of the looped section
crosses over and above the upstream end of the loop. The
4 Description of Systems
interchange is the means whereby the displacer is transfer-
red from the downstream end to the upstream end of the
4.1 General
loop without removing it from the prover. The displacer
detectors are located at a suitable distance from the inter-
Change inside the looped Portion. Such endless prover
4.1.1 There are several types of pipe prover, all of which are
loops may be manually operated or they may be automated
relatively simple and commercially available. All types operate
so that the entire sequence for proving a meter tan be ac-
on a common principle, namely the precisely measured
tuated by a Single action. The metered stream may be per-
displacement of a volume of liquid in a calibrated section of
mitted to run through the prover when the prover is not
pipe between two signalling detectors, by means of a displacer
being used for proving, and the prover need not be isolated
(a slightly oversized sphere or Piston) being driven along the
from the carrier line unless desired. This permits the move-
pipe by the liquid stream being metered. While the displacer is
ment of several different types of liquid in succession
travelling between the two detectors, the output of the meter is
through the prover, and affords a self-flushing action which
recorded automatically. Pipe provers may be operated auto-
minimizes intermixing between them, as well as providing
matically or manually.
temperature stabilization.
4.1.2 A meter being proved on a continuous-flow basis shall,
at the time of proof, be connected to a counter which tan be
4.2.2 A meter proof run in a unidirectional prover consists of a
started or stopped instantly by the signalling detectors. The
Single one-way run, therefore the base volume of a unidirec-
counter is usually of the electronie-pulse-counting type. The
tional prover is the volume of liquid, corrected to Standard
counter is started and stopped by the displacing device ac-
temperature and pressure conditions, displaced between the
tuating the detector at each extremity of the calibrated section.
detectors during a Single trip sf the displacer.
4.1.3 There are two main types of pipe prover: unidirectional
and bidirectional. The unidirectional prover allows the displacer
to travel in only one direction through the proving section, and
4.3 Bidirectional provers
has a transfer arrangement for returning the displacer to its
starting Position. The bidirectional type allows the displacer to
The bidirectional prover has a Sength of pipe in which the
move first in one direction, then in the other. lt therefore incor-
displacer travels back and forth, actuating a detector at each
porates a means of reversing the flow through the pipe prover.
end of the calibrated section and stopping at the end of each
(See figures 1, 2 and 3.)
run when it emers a region where the flow tan bypass it or
when the action of a valve diverts the flow. Suitable sup-
plementary pipework and a reversing valve, or valve assembly,
4.1.4 Both unidirectional and bidirectional provers shall be
constructed so that the full flow through the meter being either manually or automatically operated, make possible the
reversal of the flow through the prover. The main body of the
proved Passes through the prover.
prover is often a straight piece of pipe (see figure 21, but it may
be contoured or folded (sec figure 3) so as to fit in a limited
4.2 Unidirectional provers
space or to make it more readily mobile. Normally, a sphere is
used as the displacer in the folded or contoured type and a
Piston is used in the straight-pipe type. A meter proof run
4.2.1 Unidirectional provers may be subdivided into two
usually consists of a “round trip” of the displacer, and the
categories depending on the manner in which the displacer is
displaced volume in this type of prover is expressed as the sum
handled, namely the manual-return in-line type sometimes
of the displaced volumes in two consecutive one-way trips in
referred to as a “measured distance” type, and the automatic-
opposite directions.
return or circulating type, often called the “endless loop” type.
ISO 7278-2 : 1988 (EI
and the design shall provide
5 Essential Performance requirements ab, for this requiremen t. All
weld ing shall be in accordance with applicable Codes.
shall ensure that the followi ng per-
The design of a pipe prover
formante requirements are met.
6.1.3 Internal coating of the prover section with a material
which will provide a hard, smooth, long-lasting finish will
reduce corrosion and wear and will prolong the life of the
5.1 Short-term repeatability
displacer and prover. Experience has shown that internal
coatings are particularly useful whe
...
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