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

This Specification sets out the requirements for the installation of boilers and pressure vessels in buildings.

The distance between the vent of any explosion relief device for a boiler or pressure vessel and any adjacent wall, roof, ceiling or other solid construction shall be calculated in accordance with Table S30C2.

Table S30C2 Minimum clearances for explosion relief
Clearance from Minimum clearance (metres)
Adjacent wall or ceiling/roof
0.4(V/3)1/3MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaGimaiaac6 cacaaI0aGaaiikaiaadAfacaGGVaGaaG4maiaacMcadaahaaWcbeqa aiaaigdacaGGVaGaaG4maaaaaaa@3E1A@
or 0.4 m, whichever is the greater
Two walls at right angles; or one wall and a ceiling/roof
0.6(V/3)1/3MathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaaGimaiaac6 cacaaI2aGaaiikaiaadAfacaGGVaGaaG4maiaacMcadaahaaWcbeqa aiaaigdacaGGVaGaaG4maaaaaaa@3E1C@
or 0.6 m, whichever is the greater
Table Notes

VMathType@MTEF@5@5@+= feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOvaaaa@36CF@  
is the internal volume of the boiler or pressure vessel being vented up to the connection of the flue.

(1) Floor surfaces beneath boilers and pressure vessels shall be water resistant and formed to drain away from supports and structural building elements.

(2) Where a safe tray is provided to trap liquids, it must be manufactured from a material resistant to corrosion from the contents of the boiler or pressure vessel.

Building elements surrounding a boiler must be protected from any surface heat by refractory material or effective air spaces so that—

  1. steel elements do not exceed a temperature of more than 300°C; and
  2. concrete elements do not exceed a temperature of more than 200°C; and
  3. timber elements do not exceed a temperature of more than 150°C.