7.8103.3 Purging

Topic: 
Water Heating
Subtopic: 
Maintenance/Inspection
Desired Outcome: 
Damage to the equipment will be prevented by effectively removing all air from the water heating system
TitleSpecification(s)Objective(s)
7.8103.3a
System analysis

Water piping will be analyzed to identify air collection points (e.g., highpoints, deadheads, side-plumbed tanks, large pumps)

Ensure purging will be effective
7.8103.3b
Order

Purging will be done in the following order:

  • New equipment
  • Entire system
  • Verify equipment

Ensure purging will be effective
7.8103.3c
Purge new equipment

Equipment will be purged in accordance with manufacturer specifications

Effectively purge new equipment
7.8103.3d
Purge system

System will be manually purged using water pressure

Auto air vents will not be relied on for purging

Purging of air collection points (e.g., highpoints, deadheads, side-plumbed tanks, large pumps) will be verified

Effectively purge system
7.8103.3e
Verify purging of new equipment

Equipment will be purged in accordance with manufacturer specifications

Verify equipment is purged
7.8103.3f
Energize system

System will be energized and checked for air noise

Conduct final verification of purge