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GB2030963A - Liquid Sampling System - Google Patents

Liquid Sampling System Download PDF

Info

Publication number
GB2030963A
GB2030963A GB7929937A GB7929937A GB2030963A GB 2030963 A GB2030963 A GB 2030963A GB 7929937 A GB7929937 A GB 7929937A GB 7929937 A GB7929937 A GB 7929937A GB 2030963 A GB2030963 A GB 2030963A
Authority
GB
United Kingdom
Prior art keywords
transfer line
liquid
return loop
sample
outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7929937A
Other versions
GB2030963B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schlumberger UK Holdings Ltd
Original Assignee
Jiskoot Autocontrol Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiskoot Autocontrol Ltd filed Critical Jiskoot Autocontrol Ltd
Priority to GB7929937A priority Critical patent/GB2030963B/en
Publication of GB2030963A publication Critical patent/GB2030963A/en
Application granted granted Critical
Publication of GB2030963B publication Critical patent/GB2030963B/en
Expired legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/02Devices for withdrawing samples
    • G01N1/10Devices for withdrawing samples in the liquid or fluent state
    • G01N1/20Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
    • G01N1/2035Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/27Mixing by jetting components into a conduit for agitating its contents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/02Devices for withdrawing samples
    • G01N1/10Devices for withdrawing samples in the liquid or fluent state
    • G01N1/20Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
    • G01N1/2035Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping
    • G01N2001/2064Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping using a by-pass loop

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Liquid is removed from a liquid transfer line 1, for example a crude oil pipeline, through a sampling probe 2 and returned to the transfer line 1 via a return loop 3 and pump 5. At the outlet 4 of the return loop to the transfer line the returning liquid enters the liquid in the transfer line as a jet or jets which agitates the liquid to a substantially homogeneous mixture. The outlet 4 is upstream of probe 2 so that in operation the liquid entering the return loop 3 is uniformly mixed and a representative sample may be withdrawn from the return loop 3 into sample collector 11 through valves 9 and 10. To ensure mixing of sedimentary layers in the transfer line 1 the jet from outlet 4 is directed upwardly into the transfer line. In an alternative embodiment the sample is taken directly from the transfer line downstream of outlet 4 which is then not necessarily upstream of the inlet 2 to the return loop. <IMAGE>

Description

SPECIFICATION Liquid sampling system This invention is concerned with a liquid sampling system, particularly for taking samples from crude oil pipelines.
The automatic collection of representative samples during liquid transfer operations has become increasingly important in recent years, both for batching operations, such as tanker unloading, and for pipeline operations, where the flow rate is variable but continuous. The collected samples, which are used for laboratory analysis or retained for reference, are particularly important to determine crude oil properties for fiscal purposes.
It is therefore important that the sample should be taken from a homogeneous liquid flow, but this is difficult with conventional sampling systems in which a sampling probe is inserted into the transfer line, because of layering of the liquid in the transfer line, which is particularly a feature of a crude oil pipeline flow. Static or mechanically driven mixers in the transfer line upstream of a sampling probe would be unsatisfactory, since static mixers can only be serviced during shut down and would not allow pigging, and mechanical mixers would have to be very substantially constructed to withstand the flow velocities, and so would be difficult to insert and withdraw.
According to one aspect of the present invention there is provided a method of obtaining a homogeneous sample from a liquid transfer line comprising removing liquid from the liquid transfer line and returning it to the transfer line through a return loop so that it re-enters the transfer line as a jet or jets of liquid which agitate the liquid in the transfer line to a substantially uniform mixture, and removing a sample from the uniform mixture.
The sample may be removed from the return loop, in which case the outlet of the return loop to the transfer line is upstream of the inlet to the return loop and the distance between the inlet and outlet and the flow velocity in the return loop are selected empirically to ensure that the liquid in the transfer line is uniformly mixed at the inlet to the return loop. The volume of the return loop and the upstream position of the mixing jet(s) provide an integrating feature which evens out longitudinal quality variations in the transfer line.
Alternatively the sample may be obtained conventionally directly from the transfer line down stream of the outlet of the return loop at any point at which the liquid remains a uniform mixture.
A pump will normally be provided in the return loop to achieve a flow velocity in the return loop which gives satisfactory agitation of the liquid in the transfer line. The pump may be of variable rate so as to achieve isokinetic sampling, if this is desired.
According to another aspect of the invention there is provided an installation for sampling liquid in a liquid transfer line comprising a return loop including a pump to remove liquid from the transfer line and return it to the transfer line upstream of the point of removal as a jet or jets which agitate the liquid in the transfer line to a' substantially homogeneous mixture, and means for taking a sample of liquid from the return loop.
According to a further aspect of the invention there is provided an installation for sampling liquid in a liquid transfer line comprising a return loop including a pump to remove liquid from the transfer line and return it to the transfer line as a jet or jets which agitate the liquid in the transfer line to a substantially homogeneous mixture, and means for taking a sample of liquid from the transfer line downstream of the outlet of the return loop.
In a crude oil pipe line, layers of water and sediment containing crude oil tend to flow at the bottom of the pipeline. To ensure satisfactory mixing of these layers the outlet of the return loop is preferably directed upwards into the transfer line and is flush with the. internal surface of the transfer line. The latter also is desirable to allow pigging, although a retractable nozzle could be used if desired. Under normal sampling practice, the inlet to a sampler is a probe inserted 1/3{ diameter into the transfer line, and so this probe is preferably retractable. However, as a result of the mixing provided by the return loop, such a probe is really no longer necessary, and sample inlet and return loop inlet (which acts as the sample inlet when the sample is removed from the return loop) can also be flush with the internal surface of the transfer line.
The sample of liquid taken from the return loop or the transfer line may be obtained by any conventional sampling system. For accurate sampling there is preferably used a precision rotary metering pump which is pressure balanced so that line pressure is maintained on both sides of the metering pump. The sampling system is normally associated with a flow meter in the transfer line to obtain a flow responsive mode of sampling. Alternatively a time proportional control may be used where the flow rate in the transfer line is practically constant.
The samples removed from the return loop or transfer line are -fed to a sample receiver for subsequent analysis. With crude oil this may be a pressurized sample receiver or a split phase collection system which separates the gaseous component and stores them in gas sample collectors separate from the liquid components.
The accompanying drawing indicates diagrammatically a sampling system in accordance with the present invention. Referring to the drawing, crude oil passing through a pipeline 1 is intercepted by a rectractable sampling probe 2 which forms the inlet for a return loop 3. Oil entering the return loop 3 is returned to the pipeline 1 through one or more mixing jet 4. The flow velocity in the return loop 3 is controlled by a pump 5 and, by suitable adjustment of the flow velocity and selection of the number and diameter of the mixing jets 4, the stream of oil re-entering the pipeline through the jets 4 from the return loop 3 agitates the crude oil in the pipeline 1 sufficiently to ensure that it is a homogeneous mixture when it reaches the probe 2 which is the inlet to the return loop 3.
Samples of the oil in the return loop 3 may be removed by conventional sampling procedure. The system shown in the drawing is a pressure.
balanced system in which a hydraulic equaliser 6 and sample collector 7 are both connected to the return loop 3 to that line pressure is maintained on both sides of a sample metering pump 8. The metering pump 8 operates at a known flow rate so that when a sampling valve 9 is opened for a known length of time an accurate volume of hydraulic oil can be transferred from the sample -collector 7 and discharged into the hydraulic equaliser 6, causing an equal volume of the crude oil sample to be injected into the sample collector via a non-retum valve 10. By reversing the flow of hydraulic oil from the hydraulic equalizer 6 to the sample collector 7 and altering the flow path through the valve 9, the sample is discharged through sample outlet 11 into a sample receiver.

Claims (9)

1. A method of obtaining a homogeneous sample from a liquid transfer line comprising removing liquid from the transfer line and returning it to the transfer line through a return loop so that it enters the transfer line as a jet or jets of liquid which agitate the liquid in the transfer line to a substantially uniform mixture, and removing a sample from the uniform mixture.
2. A method according to Claim 1 in which the outlet of the return loop to the transfer line is upstream of the inlet to the return loop and the sample is removed from the -liquid in the return loop.
3. A method according to Claim 1 in which the sample is removed from the liquid in the transfer line down stream of the outlet of the return loop to the transfer line.
4. A method according to any one of Claims 1 to 3 in which the jet or jets of liquid are introduced upwardly into the transfer line.
5. A method according to Claim 1 substantially as described herein with reference to the accompanying drawings.
6. An installation for sampling liquid in a liquid transfer line comprising a return loop including a pump to remove liquid from the transfer line and return it to the transfer line upstream of the point of removal as a jet or jets which agitate the liquid in the transfer line to a substantially homogeneous mixture, and means for taking a sample of liquid from the return loop.
7. An installation for sampling liquid in a liquid transfer line comprising a return loop including a pump to remove liquid from the transfer fine and return it to the transfer line as a jet or jets which agitate the liquid in the transfer line to a substantially homogeneous mixture, and means for taking a sample of liquid from the transfer line downstream of the outlet of the return loop.
8. An installation according to Claim 6 to 7 in which the outlet of the return loop to the transfer line is at the bottom of the transfer line and directed upwardly into the transfer line.
9. An installation according to Claim 6 substantially as described herein with reference to the accompanying drawings.
GB7929937A 1978-03-04 1979-08-29 Liquid sampling systems Expired GB2030963B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7929937A GB2030963B (en) 1978-03-04 1979-08-29 Liquid sampling systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB3554078 1978-03-04
GB7929937A GB2030963B (en) 1978-03-04 1979-08-29 Liquid sampling systems

Publications (2)

Publication Number Publication Date
GB2030963A true GB2030963A (en) 1980-04-16
GB2030963B GB2030963B (en) 1982-10-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB7929937A Expired GB2030963B (en) 1978-03-04 1979-08-29 Liquid sampling systems

Country Status (1)

Country Link
GB (1) GB2030963B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044652A2 (en) * 1980-07-18 1982-01-27 Moore, Barrett &amp; Redwood Limited Method and apparatus for blending a fluid
EP0060634A1 (en) * 1981-03-13 1982-09-22 Moore, Barrett &amp; Redwood Limited Liquid sampling device
GB2164021A (en) * 1984-07-12 1986-03-12 Jiskoot Autocontrol Pipeline liquid sampling system
US4678639A (en) * 1984-03-02 1987-07-07 The Perkin-Elmer Corporation Apparatus for periodically monitoring the composition of a plurality of samples
GB2357710A (en) * 1999-12-24 2001-07-04 Jiskoot Autocontrol Ltd Mixing oil in a transfer line prior to sampling
NL2001803C2 (en) * 2008-07-14 2010-01-18 Kimman Process Solutions B V A device for homogenizing fluids.
WO2016023779A1 (en) * 2014-08-11 2016-02-18 Topnir Systems Sas Methods of determining properties of oil
CN106840769A (en) * 2017-02-24 2017-06-13 中国石油天然气集团公司 Oil pipeline on-line period device
CN111656185A (en) * 2017-09-25 2020-09-11 是能测量技术有限公司 Device for detecting the quality of a liquid in a supply pipe

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0044652A2 (en) * 1980-07-18 1982-01-27 Moore, Barrett &amp; Redwood Limited Method and apparatus for blending a fluid
EP0044652A3 (en) * 1980-07-18 1983-03-16 Moore, Barrett &amp; Redwood Limited Method and apparatus for blending a fluid
EP0060634A1 (en) * 1981-03-13 1982-09-22 Moore, Barrett &amp; Redwood Limited Liquid sampling device
US4678639A (en) * 1984-03-02 1987-07-07 The Perkin-Elmer Corporation Apparatus for periodically monitoring the composition of a plurality of samples
GB2164021A (en) * 1984-07-12 1986-03-12 Jiskoot Autocontrol Pipeline liquid sampling system
GB2357710B (en) * 1999-12-24 2003-03-12 Jiskoot Autocontrol Ltd Apparatus for mixing liquid in a pipeline
GB2357710A (en) * 1999-12-24 2001-07-04 Jiskoot Autocontrol Ltd Mixing oil in a transfer line prior to sampling
NL2001803C2 (en) * 2008-07-14 2010-01-18 Kimman Process Solutions B V A device for homogenizing fluids.
EP2145676A1 (en) * 2008-07-14 2010-01-20 Kimman Process Solutions B.V. Device and method for homogenizing fluids
WO2016023779A1 (en) * 2014-08-11 2016-02-18 Topnir Systems Sas Methods of determining properties of oil
US10191027B2 (en) 2014-08-11 2019-01-29 Topnir Systems Sas Methods of determining properties of oil
CN106840769A (en) * 2017-02-24 2017-06-13 中国石油天然气集团公司 Oil pipeline on-line period device
CN111656185A (en) * 2017-09-25 2020-09-11 是能测量技术有限公司 Device for detecting the quality of a liquid in a supply pipe
CN111656185B (en) * 2017-09-25 2022-12-23 是能测量技术有限公司 Device for detecting the quality of a liquid in a supply pipe

Also Published As

Publication number Publication date
GB2030963B (en) 1982-10-13

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Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19990828