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Introduction to the ASD Suppression Actuation Threshold (ASAT) Calculator
July 2007
13574_03_ASAT Calculator Sales and Marketing Introduction Presentation
Agenda
1.1. BackgroundBackground
2.2. Functions & Use Functions & Use
3.3. Benefits Benefits
4.4. Package & SupportPackage & Support
Background
Mission Critical Facilities Protection
Protection of mission critical facilities against a
fire event is achieved through:
- Early intervention (initiated by VEW)
- Suppression (initiated by VEW/EW)
Conventional practice for suppression system
actuation:
- Conventional spot-type smoke detectors
in a “Coincidence Detection” arrangement
Example of Conventional Coincidence Detection
Suppression actuation through Coincidence Detection of cross-
zoned spot-type smoke detectors
ASAT Calculator
Purpose:Recommend suitable VESDA Fire alarm threshold for suppression actuation, benchmarked against conventional spot-type smoke detectors configured for Coincidence Detection
ASAT Calculator is the first automated means of establishing equivalence between ASD and spot-type smoke detectors:1. Concept developed using CFD modelling tools2. Verified with extensive 3rd party empirical tests3. FM Approvals
FM Official Listing
ASAT Calculator is officially listed as an approved design tool in the FM Approval Guide, Chapter 14 (Electrical Signalling)
Agenda
1.1. BackgroundBackground
2.2. Functions & Use Functions & Use
3.3. Benefits Benefits
4.4. Package & SupportPackage & Support
Use of ASAT Calculator
ASAT Calculator is applicable for ceiling and floor void protection in enclosures with continuous or periodic air circulation with different airflow patterns and magnitudes
• Telecommunication facilities, base-stations
• Computer/server rooms
• Offices etc.
Use of ASAT Calculator
• ASAT Calculator Fire threshold value
– predominantly used for Suppression system actuation with a pre-engineered VESDA coincidence detection scheme
– But it may also be used for:
– Evacuation annunciation and procedure
– Fire Brigade notification
– HVAC system shutdown or conversion to smoke mode
– Automated equipment shutdown
VESDA Coincidence Detection Schemes
VESDA Detector 1 VESDA Detector 2
Alternating VESDA pipe
VESDA Detector 1
VESDA Detector 2
Coincidence Detection Cylinder
Coincidence Detection Detector
(CDD)
VESDA exhaust sampling
VESDA Detector
Hybrid detection
Normal Protection
Group Over Return Air
Vent
VESDA ceiling (floor void) / AHU
sampling
Single ASD detector with staged alarms
Design: ASAT Calculator
Required Inputs for the Calculator
1. Project name
2. Units (Metric or Imperial)
3. Entire enclosure floor area (m2 or ft2)
4. Average ceiling height (m or ft)
5. Floor void height (if applicable) (m or ft)
6. Spot-type smoke detector nominal sensitivity (%/m or %/ft)
7. VESDA sampling hole spacing (m or ft)
8. Enclosure air change rate (air change/hour)
9. Ventilation scheme
Design: ASAT Calculator Inputs & Outputs
Verification: System Commissioning Test
Test method to verify ASAT Fire thresholds during system commissioning
Agenda
1.1. BackgroundBackground
2.2. Functions & Use Functions & Use
3.3. Benefits Benefits
4.4. Package & SupportPackage & Support
Benefits of Using ASD for both VEWSD and Suppression Actuation
Detect smoke early enough to allow time to:Investigate and respond before disruption to
business continuity, loss of assets or risks to life Avoid costly suppression release Avoid the costs of nuisance alarms
Ensure the most timely and reliable actuation of suppression:High sensitivity overcomes the smoke detection
challenges presented by smoke dilution (air movement and the scrubbing of filters)
Cumulative sampling ensures reliable detection in high airflow environments
Active sampling of ASD ensures consistent performance in a range of airflows
Avoid duplication of detection schemes by using ASD for both very early detection of smoke in high airflow environments and the control of suppression release Avoid the current practice in Datacom facilities of
using ASD for VEWSD in addition to spot-type smoke detectors for suppression actuation
Benefits of Using the ASAT Calculator
Proven equivalence to industry-standard spot-type smoke detector sensitivities (but improved performance)
Thresholds calculated to specific environmental parameters
Supported as manufacturer’s recommendations and validated by verification procedure as part of commissioning
FM Approved method of calculating fire thresholds for suppression actuation
Agenda
1.1. BackgroundBackground
2.2. Functions & Use Functions & Use
3.3. Benefits Benefits
4.4. Package & SupportPackage & Support
Package
ASAT Calculator software tool (Microsoft Excel) Part No.: VSW-088 File No.: 13625
Technical Data Sheet – Part No.: 21188, DOC No.: 13583
ASAT Calculator Product Guide – Part No.: 21187, DOC No.: 12748
ASAT Verification & Commissioning Procedure DOC No.: 12746
Marketing White Paper – “What A Coincidence! – Very Early Warning Smoke Detection Together With Suppression Actuation” – DOC No.: 11843
Design Guide for Telecommunications and Data Processing Facilities – DOC No.: 11782
Detailed technical reports (available on request)
Availability & Support
Release of the ASAT Calculator to
channel partners and to end users by
request (August 2007)
Channel training by request
Applications Engineering Group (AEG)
support on major projects by request