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Sanitation

Exam revision materials for Plumbing Level 2&3 and ACS Gas Safety test

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Crossflow

Crossflow Prevention

Vertical 'No Connection Zone'

  • Crossflow could happened if two brunch pipes were connected opposite each other
  • Crossflow can be prevented by using:
  • Vertical "No Connection Zone" - within which opposite branches should not be connectedStack System

Discharge pipe size

MIN “No connection zone”

Stuck Size

Swept Entries

<65 mm

110 mm

100 mm

No

<65 mm

250 mm

150 mm

No

>65 mm

200 mm

Any

Yes

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Angle Connection

Stack System

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Parallel Junctions

50mm Parallel Junctions (connected below the “no connection zone”)Stack System

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Soil Manifold

Stack System
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