Questions |
Response |
Comment/Action |
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Yes |
No |
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1.0
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Refrigerant Detection System & Detectors
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1.01
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Are Gas
Detectors installed at High Level (1)
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1.02
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Is there at
least 1 detector at ceiling level on a grid of 10m to 20m intervals? (2)
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1.03
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Are the detectors
above or to both sides of compressors or downwind in direction of
continuously operating extract fans? (1)
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1.04
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If the plant
room has deep ceiling beams are detectors installed between & under
beams? (1)
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1.05
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Is there an
emergency power supply, e.g. battery or UPS for the detection system?
(1)
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1.06
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Does the
detector provide a low level alarm at 500PPM (0.05%) & a high level alarm
at 30,000 PPM (3%) max
Detection
values for older systems will probably be Low 5,000 PPM (1/2%) High
10,000 PPM (1%)(1)
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If the
detection system has been installed since 2000.
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1.07
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Does the
Detector low-level alarm start the extract fans? (1)
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1.08
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Does the
Detector low level alarm activate an alarm in a supervised area? (1)
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1.09
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Does the
Detector low level Alarm activate an alarm local to the plant room? (1)
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1.10
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Does the
Detector High Level Alarm start extract fans? (1)
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1.11
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Does the
Detector High Level Alarm activate an alarm in a supervised area? (1)
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1.12
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Does the
Detector High Level Alarm activate an alarm local to plant room? (1)
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1.13
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Does the
Detector High Level Alarm cut all power to plant, controls & apparatus in
the plant room that are not rated for use in a hazardous area? (1)
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1.14
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Are Sounders
& Beacons fitted & operational? (1)
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2.0
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Ventilation |
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2.01
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Are there
plant room extract fans fitted? (1)
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2.02
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Is the fan
motor explosion proof type (Ex), or alternatively installed outside the plant
room & air stream? e.g. bifurcated fans. (1) (7)
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2.03
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Is there risk
that the fan construction & materials shall contribute to fire or
sparking? (1) (7)
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2.04
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Are there
sufficient fans installed? (1)
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Air extract of
15 air changes/hour or sized to BS EN 378-3-2000 section 5.5.3. (1)
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3.0
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Electrical Installation
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3.01
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Are there
switches to disconnect all electrical circuits & apparatus in plant room,
unless suitable for operation in a hazardous area? (1)
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3.02
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Does the
refrigerant detection alarm system automatically disconnect all electrical
circuits entering the plant room? (1) (7)
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Apart from
hazardous area circuits e.g. Ventilation Fans, Emergency Lighting & Alarm
Sounders & Beacons
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3.03
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Is the switch
room where control panels/power distribution panels are housed Positively Pressurised
with a fresh air supply? (1)
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Not required
if there is no door direct from Switch Room to Plant Room & dividing wall
is 60-minute fire rated & imperforate
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3.04
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Is adequate
emergency lighting provided to allow operation of controls & evacuation
of personnel when normal lighting fails or is disconnected? (1)
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3.05
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Is emergency
lighting that operates after a High Level Leak hazardous area rated? (1)
(7)
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4.0
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Plant Room
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4.01
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Is the area an
ear protection zone? (1)
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4.02
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Is there a
drench shower available adjacent to the plant room? (1)
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4.03
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Is there
eyewash available adjacent to the plant room? (1)
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4.04
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Are there
appropriate fire extinguishers in the area? (1) (7)
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4.05
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Is there an
emergency plan posted? (1) (7)
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4.06
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Is there a
supply of fresh water in, or near to, the plant room? (1)
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5.0
|
DSEAR & EPS |
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5.01
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Has the
Employer implemented a suitable Risk Assessment for the risks arising from
use of Ammonia? (3) (6)
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5.02
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Is there a
Permit to Work system? (3) (6)
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5.03
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Does the
customer have Safety Method Statements for maintenance, repair & service
available? (3) (6)
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5.04
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Has Explosion
relief been catered for? (1) (3) (4) (6)
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5.05
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Are Plant
Rooms separated from other parts of the premises by physical fire resistant
barriers? (1) (4)
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5.06
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Do Ammonia
Vent pipes discharge to a safe place? (1) (4) (8)
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5.07
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Do vessels
That may contain liquid ammonia have pressure relief valves? (1) (4) (7)
(8)
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5.08
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Has the Employer
carried out an assessment of all Ignition Sources within the plant room?
(3) (5)
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5.09
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Is there safe
access for emergency services for fire fighting & rescue? (3) (6)
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5.10
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Is there a
Manual override switch to shut down equipment? (3) (6)
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5.11
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If Plant Room
has Natural Ventilation only, is there at least 2 outside walls louvered?
(3) (5)
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5.12
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Is plant room
clear of waste than can be readily ignited or it is stored in a closed metal
bin? (3) (5)
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5.13
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Are all doors
in a physical barrier of fire resisting construction and self closing?
(1) (3) (5)
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5.14
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If fitted
glazed-viewing panels in doors confirm that they do not exceed 20% of door
area? (3) (5)
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5.15
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Are fire walls
& fire resisting structures that provide containment for leaks free of
perforations & openings? (3) (5)
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5.16
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The employers
Risk Assessment must include other areas where the Ammonia may spread?
(3)
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5.17
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Is there a
record of equipment intended to operate when a potentially explosive
atmosphere is present? (3)
|
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5.18
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Are there
maintenance records for the equipment? (3)
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5.19
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Is there a
record of maintenance for equipment located outside the hazardous area but
required for safety e.g. Leak Detection & it’s power supplies? (3)
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5.20
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Do the Plant
Rooms have warning signs at entry doors? (3)
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5.21
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Does the
Employer have an accident, incident & emergency plan? (1) (3)
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5.22
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Is First Aid
Equipment available? (1) (3)
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5.23
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Are site
emergency procedures displayed in a safe place? (3)
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5.24
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Is Equipment
intended to operate after an Ammonia leak
`Ex` rated – note this applies to Mechanical as well as Electrical
equipment? (3) (7)
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5.25
|
Do gas
detectors with Sensors inside & controllers outside the Plant Room comply
with EPS & CE mark including ATEX mark? (3) (4) (5) (7)
|
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REFERENCES
- (1) BS EN 378: 2000 Refrigerating Systems and Heat Pumps. Safety and environmental requirements.
- (2) HSE Guidance Note PM 81. Safe Management of ammonia refrigeration systems.
- (3) DSEAR, The Dangerous Substances and Explosive Atmospheres Regulations 2002. (Implements
ATEX 137). Also Approved Code of
Practice and Guidance L138.
- (4) DSEAR, Design of plant, equipment and workplaces, Approved Code of Practice and Guidance
L134.
- (5) DSEAR, Control and mitigation measures, Approved Code of Practice and Guidance L136.
- (6) DSEAR, Safe maintenance, repair and cleaning procedures, Approved Code of Practice and
Guidance L137.
- (7) EPS, The Equipment and Protective Systems for Use in Potentially Explosive Atmospheres
Regulations, 1996. (Implements ATEX
95).
- (8) The Pressure Systems Safety Regulations 2000.
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