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Safety and environmental standards for fuel storage sites
Final report
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Figure 9
Designs for pipe penetrations through bund walls
203 Where the operator does not consider the existing joints to be fire resistant or leak tight,
one upgrade option would be to bolt on a steel protection ring (split for installation) sealed with
fire/chemical resistant sealant. This is similar in principle to the steel plates for expansion joints
covered in the next section. Slit plates can be installed by cold methods without the need for
removing the pipeline from service for modification and welding.
204 For existing pipes running through bund walls there are genuine concerns regarding possible
corrosion crevices between the pipe and the wall. An upgrade option which has been used is
to reduce the pipe size (only local to the penetration) and use the existing pipe as a sleeve with
the BSTG puddle flange arrangement. This then allows various options to seal between the
sleeve and bund wall without concerns for thinning of the product pipe (primary containment).
Regular inspection is still required to ensure that long-term corrosion of the sleeve (secondary
containment) does not provide a leak path from the bund.
205 Figure 10 provides a detail for a sealed sleeve upgrade option.
Puddle
flange
Upgrade option if existing
penetrations are not fire
resistant or leak tight
Steel protection plates bolted
to bund wall and sealed with
fire/chemical resistant sealant
EXISTING
PENETRATIONS
Sleeved
penetration