ETSI TR 102 750 V1.1.1 (2008-07)

Electromagnetic compatibility and Radio spectrum Matters (ERM); Radar level gauging applications in still pipes

DTR/ERM-TGTLPR-0115

General Information

• Status: Published
• Publication Date: 29-Jul-2008
• Technical Committee: ERM TGTLPR - Tank Level Probing Radar
• Current Stage: 12 - Completion
• Due Date: 15-Aug-2008
• Completion Date: 30-Jul-2008

Standards Content (Sample)

ETSI TR 102 750 V1.1.1 (2008-07)
Technical Report


Electromagnetic compatibility
and Radio spectrum Matters (ERM);
Radar level gauging applications in still pipes

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2 ETSI TR 102 750 V1.1.1 (2008-07)



Reference
DTR/ERM-TGTLPR-0115
Keywords
UWB, radio
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3 ETSI TR 102 750 V1.1.1 (2008-07)
Contents
Intellectual Property Rights.4
Foreword.4
Introduction .4
1 Scope.5
2 References.5
2.1 Normative references.5
2.2 Informative references.5
3 Definitions, symbols and abbreviations .6
3.1 Definitions.6
3.2 Symbols.7
3.3 Abbreviations.7
4 Products considered in the present document .8
4.1 Examples of still pipe installations.8
4.1.1 Installation scenario.9
5 Concept of adherence to existing regulation for still pipe radars.10
5.1 Applicable regulations.10
5.2 Indoor-like shielding .10
5.3 Mitigation of EM interferences to victim radio devices.11
5.3.1 Low density of still pipe units.11
5.3.2 Shielding effects.11
5.3.2.1 Primary shielding.11
5.3.2.2 Secondary shielding.11
5.3.3 Frequency domain and time domain mitigation techniques.11
5.3.3.1 Frequency domain.11
5.3.3.2 Time domain .12
5.3.4 Reduction of transmit power.12
5.4 Thermal Radiation.12
5.5 Pulse Repetition Frequency (PRF) .12
6 Measurement examples .13
History .14

ETSI

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4 ETSI TR 102 750 V1.1.1 (2008-07)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Report (TR) has been produced by ETSI Technical Committee Electromagnetic compatibility and Radio
spectrum Matters (ERM).
Introduction
The present document describes the application of Tank Level Probing Radar for the use in a specific type of tank that
is not covered by the existing standard EN 302 372 [i.10] describing Tank Level Probing Radar installed in a closed
metallic tank. The present document describes an application of level probing radar used on a tank type called floating
roof tank, where the tank roof is floating on the surface of the tank content. The level in the tank is probed via a pipe
that is fixed at the bottom and top of the tank and extends through a hole in the floating roof. Figure 1 shows a typical
floating roof tank with the radar gauge mounted on top of the pipe. The pipe is usually referred to as a "still pipe".
Level probing radar
Still pipe
Floating roof


Figure 1: Floating roof tank with still pipe for level measuring.
This still pipe is perforated in order to enable the liquid to enter the pipe and to ensure that the level in the pipe is the
same as on the outside. Floating roof tanks are used in petroleum refineries and storage plants together with closed
metallic tanks.
The purpose of the present document is to describe the application and show that the radar energy propagating inside
the pipe has a limited leakage to the outside of the tanks, and conformance to applicable standards can be achieved.
ETSI

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5 ETSI TR 102 750 V1.1.1 (2008-07)
1 Scope
The present document provides guidance in resolving applications radar gauges installed on still pipe in external
floating roof tanks.
The still pipe equipment consists of a TLPR and a dedicated still pipe to be operated in defined installation scenarios.
The purpose of the present document is to give a survey of the background for a possible future ETSI test specification
for emissions from radar level gauging applications in still pipes that are not covered by EN 302 372 [i.10].
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably,
the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the
reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the
method of access to the referenced document and the full network address, with the same punctuation and use of upper
case and lower case letters.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
Not applicable.
2.2 Informative references
The following referenced documents are not essential to the use of the present document but they assist the user with
regard to a particular subject area. For non-specific references, the latest version of the referenced document (including
any amendments) applies.
[i.1] Directive 1999/5/EC of the European Parliament and of the Council of 9 March 1999 on radio
equipment and telecommunications terminal equipment and the mutual recognition of their
conformity.
[i.2] void.
[i.3] ECC Decision of 24 March 2006 amended 6 July 2007 at Constanta on the harmonized conditions
for devices using Ultra-Wideband (UWB) technology in bands below 10.6 GHz
(ECC/DEC/(06)04) amended 6 July 2007.
ETSI

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6 ETSI TR 102 750 V1.1.1 (2008-07)
[i.4] ISO 4266-1 (2002): "Petroleum and liquid petroleum products -- Measurement of level and
temperature in storage tanks by automatic methods -- Part 1: Measurement of level in atmospheric
tanks".
[i.5] ECC(07)116-Annex 13: "Definitions for peak/mean power under ECC regulations for specific
UWB applications".
[i.6] Commission Decision 2007/131/EC of 21 February 2007 on allowing the use of the radio
spectrum for equipment using ultra-wideband technology in a harmonized manner in the
Community.
[i.7] CISPR 16-1: "Specification for radio disturbance and immunity measuring apparatus and
methods - Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring apparatus".
[i.8] API MPMS 3.1A and 3.1B: "Manual of Petroleum Measurement Standards Chapter 3 - Tank
Gauging, Section 1A - Standard Practice for the Manual Gauging of Petroleum and Petroleum
Products, published on 1 of August 2005 / Tank Gauging Section 1B - Standard Practice for Level
Measurement of Liquid Hydrocarbons in Stationary Tanks by Automatic Tank Gauging, published
on 1 of June 2001".
[i.9] ITU-R Recommendation P.526-6 " Propagation by diffraction".
[i.10] ETSI EN 302 372-1: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Short
Range Devices (SRD); Equipment for Detection and Movement; Tank Level Probing Radar
(TLPR) operating in the frequency bands 5,8 GHz, 10 GHz, 25 GHz, 61 GHz and 77 GHz;
Part 1: Technical characteristics and test methods".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
dedicated antenna: antenna that is designed as an indispensable part of the equipment
dedicated still pipe: still pipe is always inserted inside the tank
NOTE: The pipe cannot be working alone or outside the tank like bypass pipe in process tank.
Device Under Test (DUT): TLPR under test without a test still pipe
duty cycle: ratio of the total on time of the transmitter to the total time in any one-hour period reflecting normal
operational mode for pulsed modulation system
emissions: signals that leaked or are scattered into the air within the frequency range (that includes harmonics) which
depend on equipment's frequency band of operation
NOTE: For TLPRs there is no
...