5.3103.5 One-Pipe Steam System—Steam Air Vents

Topic: 
Hydronic Heating (Hot Water and Steam)
Subtopic: 
Piping (Distribution Installation)
Desired Outcome: 
Optimized steam system for even and rapid distribution
TitleSpecification(s)Objective(s)
5.3103.5a
Check for presence of asbestos-containing materials (ACMs)

Potential ACMs will be handled in accordance with SWS 2.0110.2 Potential Asbestos-Containing Materials

Ensure a safe work environment
5.3103.5b
Optimize system

Contractor will repair or replace steam air vents in building to ensure the system responds quickly and evenly

Proper pitch of radiator will be verified by a contractor

Ensure even heating distribution during peak and shoulder months
5.3103.5c
Steam main air vents

Air vents will be installed at end of steam mains

Number of vents required will be determined based on volume of air that needs to be displaced

Air vents will be installed minimum 15" from the end to minimize damage

Air vents will be installed on 6"–10" nipple from top of the steam piping

Air vents will be installed on vertical risers, 4"–6" below the top end

Ensure balanced heat distribution
5.3103.5d
Radiator air vents

Air vent size (venting capacity) will be determined by location of the terminal unit within distribution system and size of the terminal unit

Air vent will be installed in upright position

Discharge air for proper steam distribution
5.3103.5e
Education

Completed work will be reviewed with the building/property management team and operations staff

Building/property management team and operations staff will be educated on the safe and efficient operation and maintenance requirements of the installed item

Ensure building/property management team and operations staff is informed of the safe, efficient operation and maintenance requirements of the installed item