Materials

• Copper [BS EN 1057] Table X
  • Copper is susceptible to corrosion when directly contacted with Galvanised LCS
  • Grade 3
• Galvanised LCS
• Polybutylene
• Chlorinated Polyvinyl-chloride (cPVC)
• uPVC (unplasticized) for cold water (brittle above 20°C)
• Cross-linked polyethylene (PE-X) – under-floor heating (tends to sag)
  
  

Thermal Movement Allowance

• Gland expansion joints
• Expansion loops
• Horseshoe expansion loops

Trace Heating

• frost and dead legs protection for industrial
  

Hydrauling Gradient

Secondary Circulation

• Return to 1/3 from the top of the vessel
• Bronze Pump MUST be used to avoid the pump rusting
• MIN return temperature is 50°C
• Controlled by a Time Switch
  
• MAX Length of HW pipework without secondary return
  • ≤22mm – 12m
  • ≤28 mm – 7.5m
  • >28mm – 3m
  • MAX 30 sec for HW to reach a tap