The risk assessment of fire damper installations

Transcription

The risk assessment
of
fire damper installations
June 2010
Paul White
OVERVIEW
OVERVIEW
2
The purpose of this presentation is to highlight
that fire dampers form a key part of the
passive fire protection within a building, but
are at best often overlooked, but at worst not
even recognised for the job that they might be
called on to do in the event of fire.
It seeks to clarify the regulatory requirements
and fill in the gaps left by the guides to the
RRFSO where fire dampers are installed in a
building
THE RISK ASSESSMENT OF FIRE DAMPER INSTALLATIONS
What is this?
FIRE DOORS
Everyone knows what a fire door is and most people see one every day
3
What is this?
FIRE DAMPERS
This is a fire damper and they are generally hidden above ceilings and
mounted in a ductwork run, most people don’t know that they exist
4
Ad hoc testing to BS476-20/22
FIRE
DAMPERS
BS476 -20/22
This shows a fire damper during the old style of ad hoc testing to BS 476
5
Test setup for EN 1366-2
FIRE
DAMPERS
BS EN1366-2
The fire damper is subjected to a 300pa pressure difference for the whole
of the test and the leakage recorded as a pass failure criteria
6
Fire and Leakage Rated Fire Dampers
FIRE
DAMPERS
BS EN 1366-2
Fire damper tests to EN 1366-2 in practice
7
Fire Dampers
Application and test details
FIRE DAMPERS
APPLICATION
AND TEST
DETAILS
8
For use in normal ventilation ducts at fire boundaries to maintain
compartmentation in the case of fire
Generally tested for Integrity (E), Insulation (I) (if required) and
Reduced Leakage (S) (again, if required)
Also considered are horizontal, vertical, fire from inside to
outside, fire from outside to inside, symmetry etc
Units are mounted in a supporting partition, such that would be
used in practice.
During the test, the damper must close, and is then subjected to
a 300Pa pressure differential.
E – Integrity – damper must not leak more than 360 m3/hr/m2
I – Insulation – thermocouples record temperature rise (140/180
°C max)
S – Leakage rating – damper must not leak more than 200
m3/hr/m2, at ambient and during the fire test. The smallest
example must also not leak more than 200 m3/hr/m2
Fire Damper Standards
Product standard
EN 15650: 2010 Fire dampers
Published (CEN TC156 WG9)
Test standard
EN 1366-2:1999: Fire resistance tests for service installations: Fire dampers
Published, but under review (CEN TC127 WG2 TG4)
Classification standard
FIRE DAMPERS
-2 –
STANDARDS
EN 13501-3:2005: Fire classification of construction products and building
elements - part 3: classification using data from fire resistance tests on
components of normal building service installations
Published (CEN TC127 WG7)
Extended field of application standard
prEN 15882-2: Extended applications of test results for fire resistance tests
for service installations : Dampers
Under development
9
(CEN TC127 WG2 TG4)
Regulation - ADB
APPROVED
DOCUMENT B
(1)
10
The following slides give a
snapshot of the requirements
in Approved Document B
It is strongly recommended
that anyone making risk
assessments carefully
considers the requirements in
this document and does not
rely purely on the information
given here
It is available as a free
download from
http://www.planningportal.gov.uk/ search on “approved
documents”
Regulation - ADB
APPROVED
DOCUMENT B
(2)
11
Mechanical ventilation and
air-conditioning systems –
Page 60 5.47 Para 2
“Where the ductwork
system serves more than
one part of a sub-divided
escape route, a fire
damper should be
provided where the duct
work enters each section
of the escape route
operated by a smoke
detector or suitable fire
detection system. The fire
dampers should close
when smoke is detected”
Regulation - ADB
APPROVED
DOCUMENT B
(3)
Mechanical ventilation and
air-conditioning systems –
Page 60 - 5.48 Note
“Fire dampers activated
only by fusible links are
not suitable for protecting
escape routes. However
an ES classified fire and
smoke damper which is
activated by a suitable fire
protection system may be
used”
12
Regulation - ADB
Ventilation ducts, flues etc. –
Page 86 - 10.9
APPROVED
DOCUMENT B
(5)
13
“Where air handling ducts
pass through fire separating
elements the integrity of
those elements should be
maintained
There are 3 basic methods
and these are:
Method 1: protection using
fire dampers;
fire resistant enclosures;
fire-resisting ductwork”
Regulation - ADB
APPROVED
DOCUMENT B
(6)
14
Ventilation ducts, flues etc.
– Page 86 - 10.10
“Method 1 (e.g. Dampers) is
not suitable for extract
ductwork serving kitchens.
This is due to the likely build
up of grease which can
adversely affect the
effectiveness of any
dampers.”
Regulation - ADB
APPROVED
DOCUMENT B
(7)
15
Fire dampers – Page 86 10.11
“Fire damper should be
situated within the thickness
of the fire separating
element and be securely
fixed. It is also necessary to
ensure that, in a fire,
expansion of the ductwork
would not push the fire
damper through the
structure.”
Regulation - ADB
APPROVED
DOCUMENT B
(8)
16
“Adequate means of access
should be provided to allow
inspection, testing and
maintenance of both the fire
damper and its actuating
mechanism.”
Regulation - ADB
APPROVED
DOCUMENT B
(9)
“Where the use of the
building involves sleeping
risk, such as an hotel or
residential care home, fire
dampers should be
actuated by smoke
detector-controlled
automatic release
mechanism, in addition to
being actuated by thermally
actuated devices......... (caveats
on certain types of alarm systems and abilities of
people to leave the area) ............
17
Regulation - ADB
APPROVED
DOCUMENT B
(12)
18
Fire dampers – Page 86 10.13 cont.
“Note: Fire dampers actuated
only by fusible links are not
suitable for protecting escape
routes. However, an ES
classified fire and smoke
damper which is activated by
a suitable fire detection
system may be used”
Regulation - ADB
APPROVED
DOCUMENT B
(14)
19
“Fire dampers should be
tested to BS EN 1366-2:1999
and be classified to BS EN
13501-3:2005. They should
have an E classification
equal to, or greater than, 60
minutes. Fire and smoke
dampers should also be
tested to BS EN 1366-2:1999
and be classified to BS EN
13501-3:2005. They should
have an ES classification
equal to, or greater than, 60
minutes.”
Regulation - ADB
APPROVED
DOCUMENT B
(15)
Fire dampers – Page 86 10.15 Note 1
“Note 1: Fire dampers tested
using ad-hoc procedures
based on BS476 may only be
used be appropriate for fanoff situations.
In all cases, fire dampers
should be installed as
tested.”
PW Note: You cannot get an E or
ES classification if you test to
BS476, so dampers for sleeping
risk areas and escape routes need
to be tested to EN1366-2
20
Regulation - ADB
APPROVED
DOCUMENT B
(1)
21
ADB refers to a lot of second tier
documents and also references
other guides.
This BS5588 series is referred to
and is still apparently valid,
although effectively withdrawn.
The department for
Communities and Local
Government (CLG) still says that
it contains good and safe
information. It is replaced by BS
9999 and this where we get
some clear guidance on
maintenance requirements (ex
BS 5588-12)
ADB also recommends the use
of third party certificated
products
Other publications - ASFP
ASFP Grey Book
ASFP
GREY BOOK
22
About to be published in
its second edition
Contains details of
regulation, standards
testing etc
Also gives some guidance
on project planning and
installation
It is planned that it will list
certificated products with
approved installation
methods
Also has sister documents
about fire rated dusts,
structural steel protection
and fire seals
Other publications - HVCA
HVCA DW144
and DW145
HVCA
DW144 &
DW145
23
DW144 is under
review for its
second edition
For dampers this
is supported by
DW145 which
will be referred
to for damper
installations
Other publications – Dept of Health
HTM 05-02
DEPARTMENT
OF HEALTH
HTM 02-05
(1)
24
Written to cover
healthcare premises
Describes fire dampers in
terms of BS EN 1366-2
classified E and ES
Fire and smoke dampers
classifed ES
Transfer grilles should be
fitted with fire and smoke
dampers
Where walls do not pass
the ceiling, ducts through
the ceiling should be
protected with fire
dampers
HTM 05-02 {cont}
DEPARTMENT
OF HEALTH
HTM 02-05
(2)
Fire & Smoke dampers in
compartment walls
motorised to close on
signal
Fire & Smoke dampers in
sub compartment walls link only
PW Note: motorised would
probably be better for regular
testing
Ducting serving fire
hazard rooms should be
protected with dampers, or
if duct is passing through,
no dampers, but fire
resisting duct
25
HTM 05-02 {cont}
DEPARTMENT
OF HEALTH
HTM 02-05
(3)
26
Installation
requirements are given,
but unfortunately this
does not say “use
manufacturers
instructions”, rather
what not to do, also a
requirement for ceilings
It requires details of all
dampers to be included
in the fire strategy and
drawings for complex
buildings
Other publications – Dept of C S F
BB100
DEPARTMENT
OF CHILDREN,
SCHOOLS &
FAMILIES
BB100
27
Generally as ADB
References the ASFP
Grey Book
Product certification –
“for property protection
fire dampers should
also satisfy LPS1162”
It requires details of all
dampers to be included
in the fire strategy and
drawings for complex
buildings
Certification standard - LPCB
CERTIFICATION
STANDARD
28
The LPCB run a certification
scheme for fire dampers. The
LPS 1162 document contains
all the tests that LPC require
the product to undergo, before
certification may be offered
It also states that to meet it, a
company must have full BS
EN ISO 9001 accreditation.
The LPCB visit the factory at
least once a year to confirm
by measurement that the
certificated products maintain
all the tested dimensions,
and confirm that the products
still comply with any
assessments that may have
been made
Regulatory Reform (Fire Safety) Order - RRFSO
RRFSO
RRFSO
-1-
There is a series of
published guides to meeting
the requirements of the
RRFSO
Information on fire dampers
is vague, but is generally as
follows:
1) laundry chutes (smoke and fire
dampers)
2) dampers in ducts should be correctly
installed
3) the fact that in cooking processes
ventilation ducts and dampers should
be considered.
29
RRFSO
However, fire dampers are
referred to indirectly as
follows:
RRFSO
-3-
30
1) In a checklist: Are any holes or
gaps in walls, ceilings and floors
properly sealed, e.g. where
services such as ventilation ducts
and electrical cables pass through
them?
2) Ventilation systems: Where
ventilation systems might assist
the spread of flames, smoke and
hot gases from a fire it will be
necessary to take steps to safe
guard the means of escape
against this hazard.
RRFSO
RRFSO
-3-
31
Unfortunately, fire dampers
are not referred to in the
maintenance check list
section, which is a key area
where they should be, or in
the frequency of checking
section, also key.
Therefore we need to turn
to BS9999 for further
guidance
BS9999
BS9999
-1-
32
Annex V (normative): Routine
inspection and maintenance of
fire safety installations
This requires smoke control
systems and their components
to be tested as often as
weekly, however it is not clear
what constitute smoke
dampers. This could possibly
refer to dampers that are used
to protect escape routes and
areas with sleeping risk. This
should be considered by the
designer and perhaps the risk
assessor.
BS9999
BS9999
-2-
33
Annex W (normative): Routine
inspection and maintenance of
ventilation and air conditioning
ductwork
This requires simple fire
dampers (spring operated – so
probably curtain fire dampers)
to be tested every two years or
more often if conditions are
such that they get dirty quicker.
Both annexes should be
looked at in their entirety
before drawing any
conclusions, and consideration
given to the rest of the
document
Risk assessment
Considerations/Key areas
RISK
ASSESSMENT
-1-
34
The positioning of the product
The application of the product (fire, or fire
and smoke)
The supporting construction into which the
damper is fitted
What testing has been undertaken?
What assessment information is available?
What maintenance regimes are in place?
Risk assessment
Positioning of the product
RISK
ASSESSMENT
-2-
Is it known where all the fire, and fire and smoke, dampers are installed schedule and drawing
Is there clear access, both outside and inside for cleaning and maintenance
Are there any gaps around the damper between it and the supporting
construction?
Is the fire damper mounted within the wall?
The last might be allowed if the duct and the joint with the wall are installed using
a tested method
Application – escape route or area with sleeping
risk
Does the fire damper have an ES classification (or equivalency through
assessment) when mounted in the supporting construction being used – e.g.
masonry, dry wall, batt, other fire stopping etc?
Has the damper been installed to the manufacturers instructions or at least to the
documented satisfaction of the BCA?
Note to get an ES classification, the damper must have been tested (or assessed
for equivalency) to BS EN 1366-2, BS 476 cannot confirm the S low leakage
criteria
35
Risk assessment
Application – are the fans immediately turned
off in the event of a fire incident
RISK
ASSESSMENT
-3-
36
Dampers tested ad hoc to BS 476 may be acceptable if the fans are turned
off.
Dampers having an E classification are, however, recommended and must
be used if the fans are left on.
If the fans are left on, curtain fire dampers are not recommended as they
may be held open by residual airflow
Does the fire damper have an E classification (or equivalency through
assessment) when mounted in the supporting construction being used – e.g.
masonry, dry wall, batt, other fire stopping etc?
Has the damper been installed to the manufacturers instructions or at least
to the documented satisfaction of the BCA?
Note to get an E classification, the damper must have been tested (or
assessed for equivalency) to BS EN 1366-2
Risk assessment
Maintenance regime
RISK
ASSESSMENT
-4-
37
Does this exist for the fire dampers?
Is the responsible person aware of this
requirement?
Do adequate records of testing and
inspection exist?
Do the records note any and all remedial
action to the fire damper and to the seal
between it and the supporting construction
Refer to Annex V and Annex W of BS9999
Summary
SUMMARY
38
The requirements for the risk assessment of fire
dampers are not clear from the RRFSO
However, through reference to ADB and BS9999, a
clear path can be drawn
Additional help is given in the ASFP Grey Book and
HVCA DW145
There must be clear records of where dampers are
positioned, that they are installed correctly and that
they are maintained correctly, including the state of
any seal around the damper at the interface between
it and the supporting construction
WRONG
WRONG
-1-
The damper is not in the plane of the wall and the duct is not protected.
Has the damper been tested in association with batt? If fire resisting, is the
duct supported around its outside at its joint with the wall
39
WRONG
WRONG
-2-
The dampers are not in the plane of the wall, the duct is not protected
and it is unlikely that the dampers have been tested passing through a
hole in a steel beam
40
WRONG
WRONG
-3-
!
41
RIGHT
RIGHT
-1-
The damper is within the plane of the wall, the installation is complete and
without any damage to the seal around the damper.
Note: However, it needs to be checked that damper has been tested in a batt
installation, especially for ES requirements
42
The risk assessment of fire
damper installations
THANK YOU FOR LISTENING

The risk assessment of fire damper installations

Transcription

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