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SHE Code 33:
Safety of Pressure
and Vacuum Systems
Safety, Health and Environment
(SHE) Group
Who should use this
presentation & read the code
Managers of staff, visiting scientists;
STFC site tenants, and those responsible
for contractors on STFC sites who may
design, manufacture, build, install, use or
maintain:
a) Pressure Systems (excluding hydraulic
systems); or
b) Vacuum Systems.
STFC Safety, Health and
Environment (SHE) Group
SHE Code 33:
“Safety of
Pressure and
Vacuum
Systems”
Why a Pressure/Vacuum
safety code?
• A large number of Pressure and Vacuum
systems are in use on STFC sites. Failures in
such systems have the potential, and have
caused injury, damage to property and
consequent loss of time and money.
• Requirement of the ‘Pressure Systems Safety
Regulations’ (PSSR), for pressure systems,
and good practice for Vacuum Systems.
Key points
• Pressure Systems:
• containing steam; or
• fitted with Protective devices (pressure relief
valves); or
• with a Pressure*Volume of more than 250 bar
litres
• Vacuum systems fitted with Protective devices
(includes simple gas delivery systems because
the regulator functions as a protective device)
• Must be registered with your local SHE group as
they require regular examination by an
independent inspector.
Key points
• Designers of Pressure and Vacuum systems
should ensure that the design and consequent
assessment of safety is documented for any
Pressure/Vacuum system that they design.
• High risk maintenance work on pressure and
vacuum systems should be carried out under a
permit system.
• Systems bought in from outside should be
assessed thoroughly by a competent person to
ensure they are safe to use.
SHE Training
It is recognised that Pressure and Vacuum
Systems are a specialist area, and only those
with the relevant technical experience and
knowledge as detailed in Appendix 6 should
work with them.
No Code specific training courses are identified.
For help or advice with this code
contact your local SHE Group