HHSRS VERSION 2

SEPTEMBER 2004

SULPHUR DIOXIDE

Vulnerable age

Related hazards

All ages

Carbon Monoxide, Nitrogen Dioxide

HHSRS VERSION 2

Multiple locations

Yes

No

Secondary hazards

Yes

No

Front elevation

Rear elevation

A) Solid fuel stove to side extension

DESCRIPTION OF HAZARDS

Dwelling: 19th century, stone cottage.

Background: This 19th century stone cottage has had some modernisation, but many of the

existing features, including the old cast iron kitchen stove, have been kept.

Solid fuel boiler: The solid fuel boiler provides space heating for the side extension and hot water for

domestic purposes. The dwelling is in an exposed rural area. When windy, smoke and fumes from the

flue are blown back into the room. A new door and window make the kitchen relatively air tight and

there is no permanent ventilation to the room.

LIST OF RELEVANT MATTERS

LIKELIHOOD & OUTCOMES

A

# Secondary hazards

A

1

Open flued appliances

2

-

None

-

a

Flueless appliances

-

b

Disrepair to appliance

-

c

Inadequate ventilation

3

d

Disrepair to ventilation

-

e

State of flues

-

f

Disrepair to flues

-

g

Flue outlet ssiting

2

Key

3

Seriously defective

h

Extractor fans

-

2

Defective

I

Ventilation lobby

-

1

Not satisfactory

j

Carbon monoxide detectors

-

-

Satisfactory/NA

A)

Average likelihood, outcomes and HHSRS score for sulphur dioxide poisoning for all pre

1920 houses.

HHSRS VERSION 2

SEPTEMBER 2004

HEALTH AND SAFETY RATING SYSTEM SCORES

Pre 1920 House

LIKELIHOOD

Low

High

Average: 5,126

< 4200 2400 1300 750 420 240 130

75

42

24

1 in

10

Example

10

13

7.5

4

2.5

1.5 >

Justification

OUTCOMES

Class I

Class II

Class III

Class IV

Justification

RATING

Because of the exposed position of the dwelling, the likelihood of sulphur dioxide fumes

and smoke being blown back into the room over the next twelve months is significantly

greater than the average.

%

Average: 0.0

0.0

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 0.1

0.1

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 9.1

10.0

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 90.8

89.9

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Score:

12

0.0

0.1

10.0

89.9

Although the likelihood of an occurrence increases, there is nothing to suggest the

average outcomes would change

Average: <1

A B C D E F G H

I

J

399

Score

RATING SCORES AFTER IMPROVEMENT

IMPROVE

Justification

NEW RATING

Av: Nos

Likelihood to

1 in 320

Outcomes to

0.0

0.1 10.0 89.9 %

The chimney height could be extended, but a better solution might be to provide a patent

cowl to minimise the chances of fumes being blown back into the room. Permanent

means of ventilation should also be installed. This should reduce the likelihood and

consequent risk to better than average.

Improved

A B C D E F G H

I

Av: <1

J