User Manual

e1851a

Siemens Building Technologies

Cerberus Division

01.2002

1.3 Why these high costs?

D Even the slightest contamination can endanger processes and destroy an entire produc-

tion lot.

D Clean room systems must be continuously in operation. That means overpressure or

underpressure must be maintained at all times and this includes air recirculation and air

filtering. A breakdown can have catastrophic consequences for production.

D Even small fires can cause smoke and corrosion damage.

D Following contamination, the clean room must be painstakingly cleaned.

D Installations and equipment must be repaired, often even replaced.

D The entire filter installations must be cleaned, possibly replaced and requalified.

D The production downtime causes high costs and delivery bottlenecks can occur.

D Highly qualified personnel are temporarily unproductive.

D Customers buy from the competition.

D etc.

1.4 What are the likely causes of fire?

Factory Mutual lists the following causes:

– Many fires were of electrical origin, typically involving process liquid heating equipment

– Over two thirds occurred while the area was unoccupied.

1.5 The Cerberus fire protection concept

We recommend an air sampling smoke detection system with high sensitivity smoke

detectors for the monitoring of clean room areas in classes 10 – 1000. Areas of > class

1000, should supplement these measures with point-type smoke and flame detectors at

suitable locations.

We recommend individual solutions with suitable fire detectors and extinguishing systems

for the monitoring of process flow operations.

Prompt alerting of the works fire brigade and the relevant specialists is assured with an au-

tomatic fire detection system.

To limit damage we also recommend the selective use of extinguishing systems.

The enclosed planning guidelines were produced on the basis of experience with

actual installations. We now use the company’s own product „Titanus” for high-

sensitivity air sampling smoke detection systems. Corporate headquarters pro-

vides support in the planning of new systems.