HHSRS VERSION 2

SEPTEMBER 2004

UNCOMBUSTED FUEL GAS

HHSRS VERSION 2

Vulnerable age

Related hazards

All ages

Explosions, Carbon Monoxide etc

Multiple locations

Yes

No

Secondary hazards

Yes

No

Front elevation

A) Gas fire to ground floor front room

[Main photo stretched to fit exactly between

lines}

Rear elevation

Rear elevation

DESCRIPTION OF HAZARDS

Dwelling:

1920s semi-detached house

LIST OF RELEVANT MATTERS

LIKELIHOOD

A

OUTCOME

A

a

Gas supply

-

a

Gas detector provision

2

b

Gas installation

3

b

Defects to detectors

3

c Gas appliances

3

d

Maintenance defects

3

# Secondary hazard

A

e

Siting of appliances

3

-

None

-

Key

3

Seriously defective

1 Not satisfactory

2

Defective

- Satisfactory/NA

Gas pipe and fire: The gas fire fitted into the open fireplace in the front living room is old and

obsolete. The joint between the fire and the opening is unsealed. However, more relevant is that the

movement of the gas fire has loosened the joint between the pipe and the gas tap. There is no

permanent means of ventilation to the room. Neither the fire nor the gas installations have been

checked or serviced over the last five years.

A)

Improved

A B C D E F G H

I

Average likelihood, outcomes and HHSRS score for uncombusted fuel gas for all persons in

1920-45 houses.

Score

HHSRS VERSION 2

SEPTEMBER 2004

HEALTH AND SAFETY RATING SYSTEM SCORES

1920-45 House

1 in

10

LIKELIHOOD

Low

High

Average: 117,830

Example

10

< 4200 2400 1300 750 420 240 130

75

42

24

13

7.5

4

2.5

1.5 >

Justification

OUTCOMES

Class I

Class II

Class III

Class IV

Justification

RATING

Whether or not the fire is in use, there is a significant likelihood of uncombusted gas

leaking into the room. With no means of permanent ventilation (particularly at high level)

the gas will accummulate within the room.

%

Average: 1.2

1.0

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 2.3

2.2

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 41.4

46.4

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 55.1

50.4

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

14

1.0

2.2

46.4

50.4

There is nothing to suggest that the harm outcomes will differ from the average.

Example

B

Average: < 1

C D E F G H

I

J

A

2662

Score

RATING SCORES AFTER IMPROVEMENT

IMPROVE

Justification

NEW RATING

Av: Nos

Likelihood to

1 in 1,800

Outcomes to

1.0

2.2 46.4 50.4 %

The gas installations and this gas fire (and any other gas appliances) should be properly

tested and any works carried out. This would probably include renewal of the fire and of

the pipe work. In addition, permanent means of ventilation (at high level) should be

installed. These works would reduce the likelihood substantially but this would still

remain higher than average due to the presence of individual gas appliances in the

habitable rooms.

Av: <1

J