introduction to the asd suppression actuation threshold (asat) calculator july 2007 13574_03_asat...

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





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





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





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

introduction to the asd suppression actuation threshold (asat) calculator july 2007 13574_03_asat...

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