Appendix 1
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Issue date: 17 November 2006
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LFB image 250392
LFB image 250394
LFB image 250391
LFB image 250390
LFB image 250393
LFB image 250395
Appendix 1
– Working in hi-expansion foam
1
If a BA wearer has to make an entry into hi-expansion foam (Hi-Ex), a situation may arise where
the wearer may experience the LDV operating in constant flow. This is due to an ‘over pressure’
building up between the outer rubber casing and the constant flow button situated directly
beneath.
2
To overcome this phenomenon, the wearer is required to partially remove the outer rubber
casing so as to equalise the pressure on the constant flow button.
Removing the outer rubber protective casing
3
Insert finger under outer rubber casing on the opposite side to medium pressure supply hose
(see image 250392).
4
Using finger to lift the rubber casing away from the LDV body work round to bottom of LDV
taking care to carefully lift the rubber casing over the raised pin (see image 250394).
5
Push rubber casing away from LDV body (see image 250391) and leave rubber casing loose for
duration of the Hi-Ex wear (see image 250390).
Replacing the outer rubber protective casing
6
Hold the bottom of the outer rubber casing and lift over the raised pin (see image 250393) and
push into position ensure that the casing is locked into position (see image 250395).
