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Summary of Contents for Xtralis VESDA-E VEP-1P
- Page 1 DUCTS APPLICATION NOTE February 2021 Doc. No. 35424_02...
- Page 2 Ducts Application Note VESDA-E Preface Xtralis has designed an air sampling smoke detection system specifically for use in ventilation ducts. The information contained in this document will assist you when designing VESDA-E systems for this type of application. Note! This system is not suitable for use in flexible ducts.
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Page 3: Table Of Contents
Ducts Application Note VESDA-E Contents VESDA-E System Design ........................1 Sampling Pipe Configuration in Small Ducts ................1 1.1.1 VESDA-E VEP-1P ......................1 1.1.2 VESDA-E VEA ......................... 2 Sampling Pipe Configuration in Large Ducts ................3 1.2.1 VESDA-E VEP-1P ......................3 Key Design Considerations ....................... -
Page 4: Vesda-E System Design
Small ducts are defined as those of width less than 1 m (3.28 ft). The figure below (Figure 1) shows a side view of a duct section with the insertion positions for the VESDA-E VEP-1P detector inlet and exhaust pipes. -
Page 5: Vesda-E Vea
Ducts Application Note VESDA-E Table 1: Sampling hole requirements for a VESDA-E VEP-1P detector with 5 m (16.4 ft.) inlet pipe and 2 m (6.56 ft.) exhaust pipe in small ducts. Duct width (m) {ft} Number of Holes Hole Ø (mm) {in}... -
Page 6: Sampling Pipe Configuration In Large Ducts
Nominal sampling point spacing is 0.2 m (0.66 ft.). Sampling Pipe Configuration in Large Ducts 1.2.1 VESDA-E VEP-1P Large ducts are defined as those with widths of 1 to 2 m (3.28 to 6.56 ft). For these ventilation ducts, it is recommended that the inlet pipe of the smoke detector be in two branches. - Page 7 Figure 6: Cross-section view of the inlet pipe sampling hole setup and exhaust pipe in large ducts. Table 2: Sampling hole requirements for a VESDA-E VEP-1P detector with 5 m (16.4 ft) inlet pipes and 2 m (6.56 ft) exhaust pipe in a large duct.
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Page 8: Key Design Considerations
Ducts Application Note VESDA-E Key Design Considerations 1.3.1 VESDA-E VEP-1P The following should be considered when designing a VESDA-E VEP-1P for duct protection: • All inlet and exhaust pipes must be sealed at their far end with an end-cap. •... -
Page 9: Vesda-E System Installation
One solution for combating condensation is to mount the detector on its side (Figure 7). This places the laser chamber higher than the aspirator so that any water in the inlet pipe does not reach the detector chamber. Figure 7: VESDA-E VEP-1P detector sideways mounting solution, to combat condensation. -
Page 10: Vesda-E Vea
Ducts Application Note VESDA-E If you have any doubts about the installation, seek support from your local Xtralis office or VESDA distributor. 2.1.2 VESDA-E VEA Ensure duct environmental conditions do not lead to water condensation inside the tube. Key Installation Considerations You must consider the following when installing a VESDA-E system for duct protection: •... -
Page 11: Vesda-E System Commissioning
VESDA-E System Commissioning Hole Orientation Adjustment 3.1.1 VESDA-E VEP-1P The differential pressure across the inlet and exhaust pipes must be kept within ±20 Pa to ensure the normal operation of the smoke detector. Differential pressure is created by the orientation of the holes on both pipes in relation to the duct flow. - Page 12 Ducts Application Note VESDA-E Figure 8: Manometer set-up for hole orientation adjustment Method 3 is the same as Method 2, except that it does not require the manometer but uses a clear, flexible U-tube. Step Action Instead of a manometer, connect the ends of inlet and exhaust pipes to a clear U-shaped flexible tube containing water as shown (Figure 9), ensuring all connections are airtight.
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Page 13: System Performance Verification
Proceed to Step 9. Check all pipe connections and repeat Steps 5-8. If necessary, contact your local distributor or Xtralis office. Complete any additional tests required to verify compliance with local codes and standards. -
Page 14: System Maintenance
In addition to the above, the following procedure needs to be carried out during each site visit for pipe maintenance. Step Action (VESDA-E VEP-1P) Disconnect inlet and exhaust pipes from the smoke detector. Remove the end caps from the inlet and exhaust pipes. Back-flush with compressed air. -
Page 15: Disclaimer On The Provision Of General System Design Recommendations
Disclaimer On The Provision Of General System Design Recommendations Any recommendation on system design provided by Xtralis is an indication only of what is considered to be the most suitable solution to meet the needs of the common application environments described.
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