NCC 2022 Volume One - Building Code of Australia Class 2 to 9 buildings
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30

Specification 30 Installation of boilers and pressure vessels

Specification 30 Installation of boilers and pressure vessels

Specification 30 only applies to the Deemed-to-Satisfy Provisions.
2019: Spec G2.2: 1
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To clarify that Specification 30 includes the requirements for the installation of boilers and pressure vessels.

2019: Spec G2.2: 2.1
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To specify the requirements for boilers and pressure vessels.

S30C2 provides requirements for the distance between the vent of any explosion relief device and any adjacent wall, roof, ceiling or other solid construction. Table S30C2 provides the minimum clearance required which is based on the volume of the space being vented. The minimum clearance is determined by a formula which includes the volume of the space being vented. The intention of the explosion relief provisions are that in the event of an explosion the extent of damage is limited.

The minimum clearance determined in the first row is 0.4 m from an adjacent wall or ceiling/roof. 
The minimum clearance determined in the second row is 0.6 m from two walls at right angles, or one wall and a ceiling/roof. This scenario poses a higher risk of damage from overpressure experienced during deflagration, therefore the clearance is increased.

Figure Spec 30

Explosion relief device clearance.

Image
Explosion relief device clearance.

Examples

Examples of compliance with Table S30C2.
V = Volume of space being vented (e.g. furnace to the flue connection)
For this example the volume is 5 m3
x = Clearance from adjacent wall or ceiling/roof
y = Clearance from two walls at right angles; or one wall and a ceiling/roof 

Example 1

x = 0.4(V/3)1/3 
x = 0.4(5/3)1/3 
x = 0.47 m
Therefore the minimum clearance is 0.47 m.

Example 2

y = 0.6(V/3)1/3 
y = 0.6(5/3)1/3 
y = 0.71 m
Therefore the minimum clearance is 0.71 m.

2019: Spec G2.2: 2.2
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S30C3 contains two parts. The first is to require the floor surface beneath the boiler or pressure vessel to be water resistant and the floor to be graded away from supports and structural building elements. The second is to ensure that where a safe tray is provided, it must be of a material that is resistant to corrosion from the contents of the boiler.

2019: Spec G2.2: 2.3
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For steel, concrete and timber elements, S30C4 requires the protection of these elements to prevent exposure to certain temperatures emitted by a boiler or pressure equipment.