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SGB VLX A-Ex Series Documentation

Explosion-protected vacuum leak detector
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Documentation
Explosion-protected vacuum leak detector
VLX .. A-Ex
Working device –
operational in combination with leak indicating unit LAE, see documentation 605602
TÜV-A 19 ATEX 1119 X
Please read instructions prior to commencing any work
Issue: 01/2025
Art. No.: 602642

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  • Page 1 Documentation Explosion-protected vacuum leak detector VLX .. A-Ex Working device – operational in combination with leak indicating unit LAE, see documentation 605602 TÜV-A 19 ATEX 1119 X Please read instructions prior to commencing any work Issue: 01/2025 Art. No.: 602642...

  • Page 2: Table Of Contents

    Contents Table of contents General ................. 4 Information ..............4 Explanation of Symbols ..........4 Limitation of Liability ............4 Copyright ..............4 Warranty ............... 4 Customer Service ............5 Safety ..................5 Intended Use ..............5 Responsibility of the Operating Company ..... 6 Qualification ..............
  • Page 3 Contents Spare parts ................36 10. Accessories ................36 11. Disassembly and Disposal ..........37 11.1 Disassembly ..............37 11.2 Disposal ................ 37 12. Appendix ................38 12.1 Use of Interstitial Spaces That Are Filled with Leak Detector Fluid ............38 12.2 Dimensions and Drilling Pattern ........

  • Page 4: General

     Deployment of unqualified personnel  Unauthorized conversions  Connection to systems not approved by SGB Copyright The contents, texts, drawings, pictures, and any other representations  are protected by copyright and are subject to industrial property rights. Any misuse is a criminal offence.

  • Page 5: Safety

    Customer Service Our Customer Service department is available to provide you with in- formation. You can find information about contacts on the World Wide Web at sgb.de/en or on the rating plate of the leak detector. 2. Safety Intended Use ...

  • Page 6: Responsibility Of The Operating Company

    The personnel must be sufficiently qualified to recognize and avoid possible dangers on their own. Companies that put leak detectors into operation must be trained by SGB or an authorized representative. WARNING! National regulations must be complied with. Danger to people...

  • Page 7: Basic Hazards

    Safety 2.4.1 Personal protective equipment when working on systems which pose an explosion hazard The parts listed here apply in particular to safety when working on systems which pose an explosion hazard. If work is carried out in areas with a potentially explosive atmosphere, the following items of equipment are required as an absolute mini- mum: ...

  • Page 8: Technical Data Of The Leak Detector

    -700 mbar -37040 mbar -50040 mbar Special switching values can be agreed between the customer and SGB. * Classed as fulfilled for double-walled steel tanks. Lower values may occur with corresponding safety device, possibly when using a vac- uum valve.

  • Page 9: Field Of Application

    Technical Data 3.5.2 Max. operating pressure in case of error Leak detector: 5 bar Manifold 2…8: 25 bar Installation kit: 25 bar Field of Application 3.6.1 Tanks a) Single-walled horizontal (underground or overground) cylindrical tanks with leak protection lining or leak protecting jacket and suc- tion line leading to the low point Usage limits: none in terms of density and diameter b) Double-walled horizontal cylindrical (underground or overground)
  • Page 10 Technical Data c) Double-walled (or single-walled with leak protection lining or leak protecting jacket) vertical cylindrical tanks or troughs with a dished bottom (underground or overground) with a suction line leading to the low point (DIN 6618-2: 1989) Usage limits: Diameter Height [mm] Max.
  • Page 11 Technical Data e) Standing cylindrical tanks with double-layered floor made of metal (e.g., acc. to DIN 4119) - as before, but with leak protection lining (stiff or flexible) - standing cylindrical tanks made of plastic with double-layered floor Usage limits: none regarding density and diameter f) Tanks according to a) to d), which are operated with an inner over- lay pressure with up to 5 bar 3.6.2 Pipelines / hoses...

  • Page 12: Design And Function

    Design and Function 4. Design and Function Design The leak detector consists of a working device VLX .. A-Ex (shown below) and a leak indicating unit LAE. This associated leak indicating unit has separate documentation. In terms of the European standard, the working device is the leak de- tector.

  • Page 13: Normal Operating Condition

    Design and Function Normal Operating Condition The leak detector (working device) is connected to the interstitial space via suction, measuring and connection line(s). The vacuum generated by the pump is measured and controlled by a pressure switch. When the operating vacuum is reached (Pump OFF), the pump shuts off.

  • Page 14: Mounting The System

    Mounting 5. Mounting the System Basic Instructions - Prior to commencing work, the documentation must be read and understood. In case of ambiguities, please ask the manufacturer. - Observe the approvals of the manufacturer for the tank/pipeline and the interstitial space. - The safety instructions in this documentation must be adhered to.

  • Page 15: Pneumatic Connection Lines

    Mounting - To avoid excessive heating, the leak detector must not be installed directly next to a heat source. The ambient temperature must not exceed 60°C; appropriate measures may need to be taken (e.g., installation of a roof to pro- tect against sunlight, see chapter 10, accessories).
  • Page 16 Mounting - Exceptions to the return of the exhaust to the tank ventilation: Tanks with interior overlay pressure, tanks according to DIN 4119 with double-layered floor, double-walled pipes or comparable: o The exhaust line can lead outside to a safe area, outside of the explosion area: Provide a condensate trap and liquid stop valve at the end of the exhaust line.

  • Page 17: Completing Pneumatic Connections

    5.4.1 Assembling the connection to the tank’s interstitial space (1) Generally according to the tank manufacturer’s specifications. (2) SGB offers assembly kits with the various connection possibili- ties. 5.4.2 Assembling the connection to the pipelines interstitial space or test valves (1) Generally according to the pipelines/interstitial space manufactur- er's specifications.

  • Page 18: Installation Of Electric Connection Lines (Leak Detector - Leak Indicating Unit)

    Mounting 5.4.3.2 Clamping ring screw connection for metal and plastic pipes (1) Insert support sleeve (only plastic pipes) into end of the pipe (2) Insert pipe (with support sleeve) all the way to the stop (3) Tighten the screw connection by hand until resistance becomes noticeable, then tighten a further 1 ¾...

  • Page 19: Additional Instructions For Underground Tanks / Pipelines

    Mounting (4) Representation from the VLX .. A-Ex: Connecting line to LAE (Alarm, potential-free) Connecting line to LAE (Alarm, potential-free) Connecting line to LAE (Pump, phase) Connecting line to LAE (Pump, neutral wire) (5) Do not apply voltage until all electrical and pneumatic cables are connected and the housing cover is closed.
  • Page 20 Mounting 5.7.1 Block diagram Alarm switch Buzzer Pump switch Leak indicating unit Vacuum pump Leak detector - 20 - VACUUM LEAK DETECTOR VLX .. A-Ex 30/01/2025...

  • Page 21: Installation Examples

    Mounting Installation Examples 5.8.1 Horizontal cylindrical tank with leak protection lining and suction line to low point 230 V / 50 Hz Signal lamp „Alarm“, red Signal lamp “Power”, green Shut-off valve Vacuum pump Exhaust Suction line Vacuum switch Buzzer Detonation flame arrester “Mute”-Button Three-way valve in suction line...
  • Page 22 Mounting 5.8.2 Horizontal cylindrical tank, double-walled steel, without suction line to low point 230 V / 50 Hz Shut-off valve Measuring line Exhaust Suction line Detonation flame arrester Interstitial space Three-way valve in suction line Connection assembly pump Three-way valve in measuring line Leak detector Liquid stop valve - 22 -...
  • Page 23 Mounting 5.8.3 Vertical cylindrical tank acc. to DIN 6618-2 (downwards outside suction line) 230 V / 50 Hz Shut-off valve Measuring line Exhaust Suction line Detonation flame arrester Interstitial space Three-way valve in suction line Connection assembly pump Three-way valve in measuring line Leak detector Liquid stop valve Suction line to low point...

  • Page 24: Montage

    Montage 5.8.4 Tank with double bottom, exhaust opens in the open air 230 V / 50 Hz Shut-off valve Measuring line Exhaust Suction line Detonation flame arrester Interstitial space Three-way valve in suction line Connection assembly pump Three-way valve in measuring line Leak detector Liquid stop valve Suction line to low point...
  • Page 25 Mounting 5.8.5 Double-walled pipe, single, feed pressure up to 5 bar Shut-off valve Connection line Detonation flame arrester Connection assembly pump Liquid stop valve Double-walled pipe Measuring line Pressure compensation vessel Test valve Node point Suction line - 25 - VACUUM LEAK DETECTOR VLX ..
  • Page 26 Mounting 5.8.6 Double-walled pipe, connected in parallel, feed pressure up to 5 bar The liquid barri- ers (27*) con- nected in the op- posite direction to the flow direc- tion prevent the other interstitial spaces from be- ing filled with leakage liquid in the event of a leak in one pipe-...
  • Page 27 Mounting 5.8.7 Double-walled pipe, connected in series, feed pressure up to 5 bar Requirement: The volumes of the con- nected pipelines must comply with the following condition: 3  V > V ÜR 1 ÜR 1 ÜR 2 ÜR 3 ÜR 4 3 ...

  • Page 28: Commissioning

    Commissioning 6. Commissioning (1) Only perform commissioning once the steps in Section 5 “Mount- ing” have been completed (2) If a leak detector is operated on an interstitial space that is al- ready in operation, special protective measures must be taken (for example, testing for gas freedom in the leak detector and/or the interstitial space).
  • Page 29 Commissioning (7) After the operating vacuum of the leak detector has been reached (pump in leak detector shuts off), turn three-way valve 20 180°, switch off the assembly pump, and remove it. (8) Turn three-way valve 21 180° and remove the pressure measur- ing gauge.

  • Page 30: Functional Check And Maintenance

    Functional Check and Maintenance 7. Functional Check and Maintenance General (1) If the leak detection system has been properly installed and is free of leaks, trouble-free operation can be assumed. (2) Frequent switching on or continuous running of the pump indi- cates leaks, which should be corrected within a reasonable time.

  • Page 31: Functional Check

    - Testing the pump delivery pressure (7.3.5) - System tightness test (7.3.6) - A test report must be completed, confirming functional and opera- tional safety. (Test reports are available for download for the SGB website) 7.3.1 Checking and emptying the condensate traps, if required CAUTION: The condensate traps may contain the stored/conveyed product.
  • Page 32 Functional Check and Maintenance (2) For pipelines: Open the test valve at the end opposite the leak detector; in case of multiple pipe interstitial spaces, the test valves must be opened sequentially at the end opposite the leak detector. For tanks: Turn three-way valve 20 90°...
  • Page 33 Determine the test period for each interstitial space connected (and/or the entire monitored system) (calculate or use test re- ports prepared by SGB GmbH). (2) Attach the measuring gauge to the connection on three-way valve 21 and turn valve 180°.
  • Page 34 Functional Check and Maintenance (4) The test is considered passed if the vacuum does not drop by more than 1 mbar during the test period. Of course, a multiple of the test period can also be measured; in this case, the permissible vacuum drop is also a multiple. (5) Once the test is complete, return valves to their original positions and remove the measuring gauge.

  • Page 35: Malfunction (Alarm)

    Malfunction (Alarm) 8. Malfunction (Alarm) Alarm Description If an alarm goes off, one must assume that there is an explosive va- por-air mixture in the interstitial space. Take appropriate protective measures. (1) An alarm (vacuum loss) is indicated by the red “Alarm” signal lamp lighting up and the sounding of the audible signal, if availa- ble.

  • Page 36: Spare Parts

    Click at our B2B web shop to find out about spare parts: shop.sgb.de/en 10. Accessories For practical and helpful accessories, please refer to our website shop.sgb.de/en. The suitability for the respective application (re- sistances, Ex-groups, temperature classes etc.) must be observed! - Testing Device Art.no. 115395 - Electrical Separator Art.no.

  • Page 37: Disassembly And Disposal

    Disassembly and Disposal 11. Disassembly and Disposal 11.1 Disassembly Prior to and during works, make sure the unit is free of gas and the breathing air contains sufficient oxygen levels! Seal any openings through which an explosive atmosphere can carry over so they are gas-tight.

  • Page 38: Appendix

    Appendix 12. Appendix 12.1 Use of Interstitial Spaces That Are Filled with Leak Detector Fluid 12.1.1 Requirements (1) Only leak detectors with suitable alarm pressures which depend on the tank diameter and the density of the stored material may be used. (2) The procedure described below is intended for the horizontal cy- lindrical tanks (e.g., DIN 6608 or EN 12285-1).

  • Page 39: Dimensions And Drilling Pattern

    Appendix 12.2 Dimensions and Drilling Pattern Ø8,5 T=120 mm D = 120 mm VACUUM LEAK DETECTOR VLX .. A-Ex - 39 - 30/01/2025...

  • Page 40: Declaration Of Conformity

    Appendix 12.3 Declaration of Conformity SGB GmbH Hofstr. 10 57076 Siegen, Germany, hereby declare in sole responsibility that the leak detector VLX .. A-Ex is in conformity with the essential requirements of the EU directives / regulations / UK statutory requirements listed below.

  • Page 41: Declaration Of Performance

    Purpose of use: Class I vacuum leak detector for monitoring double-walled tanks and pipes Manufacturer: SGB GmbH, Hofstr. 10, 57076 Siegen, Germany Tel.: +49 271 48964-0, E-Mail: sgb@sgb.de Authorized representative: System for assessment and verification of constancy of performance: System 3...

  • Page 42: Ex-Approval

    Appendix 12.6 Ex-Approval - 42 - VACUUM LEAK DETECTOR VLX .. A-Ex 30/01/2025...
  • Page 43 Appendix VACUUM LEAK DETECTOR VLX .. A-Ex - 43 - 30/01/2025...
  • Page 44 Appendix - 44 - VACUUM LEAK DETECTOR VLX .. A-Ex 30/01/2025...
  • Page 45 Appendix VACUUM LEAK DETECTOR VLX .. A-Ex - 45 - 30/01/2025...

  • Page 46: Certificates Tüv-Nord

    Appendix 12.7 Certificates TÜV-Nord - 46 - VACUUM LEAK DETECTOR VLX .. A-Ex 30/01/2025...
  • Page 47 Appendix VACUUM LEAK DETECTOR VLX .. A-Ex - 47 - 30/01/2025...
  • Page 48 Hofstr. 10 Text 57076 Siegen Germany +49 271 48964-0 Photos and schemes are not binding for sgb@sgb.de the extend of delivery. Subject to changes. © SGB GmbH, 01/2025 - 48 - sgb.de | shop.sgb.de VACUUM LEAK DETECTOR VLX .. A-Ex 30/01/2025...

This manual is also suitable for:

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