Working pressure 6 bar maximum, 1 bar minimum.
Particular reference should be made to BS. 6644, Guidance note BG01 “Guidance on safe operation
of boilers” and “INDG436 “Safe management of industrial steam and hot water boilers”, published by
the Health and Safety Executive.
The information and guidance given below is not intended to override any requirements of either of
the above publications or the requirements of the local authority, gas or water undertakings.
In general commercial closed pressurised systems are provided with either manual or automatic
water make up.
In both instances it will be necessary to t automatic controls intended to protect the boiler, circulating
system and ancillary equipment by shutting down the boiler plant if a potentially hazardous situation
should arise.
Examples of such situations are low water level and operating pressure or excessive pressure within the
system. Depending on circumstances, controls will need to be either manual or automatic reset. In
the event of a shutdown both visual and audible alarms may be necessary.
Expansion vessels used must comply with EN 13831 and must be sized on the basis of the total
system volume and initial charge pressure.
Initial minimum charge pressure should not be less than 1.0 bar (100 kPa) and must take account of
the static head and specication of the pressurising equipment.
When make up water is not provided automatically it will be necessary to t controls which shut down
the plant in the event of the maximum system pressure approaching to within 0.35 bar (35 kPa) of
the safety valve setting. Other British Standards applicable to commercial sealed systems are:
BS. 6880: Part 2 BS. 1212 BS. 6281: Part 1 BS. 6282: Part 1 BS. 6283: Part 4
2.11
SEALED SYSTEM REQUIREMENTS
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