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HVACR216 - HydronicsHVACR216 - Hydronics
Steam System ComponentsSteam System Components
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Steam System ComponentsSteam System Components
Air vents or vacuum breaks
• Allows the system to self purge• Lets air into the system on shut down• Mounted on radiator or return line (15’ from
system)• Opens and closes due to pressure
Air vents or vacuum breaks
• Allows the system to self purge• Lets air into the system on shut down• Mounted on radiator or return line (15’ from
system)• Opens and closes due to pressure
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Air vents & vacuum breaksAir vents & vacuum breaks
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Steam System ComponentsSteam System ComponentsGauge glass• To show water level in steam boiler system
Make up• Tubular high temperature glass• Two isolation valves• Can handle high pressures & temperatures
Normal level is ½ to ¾ full
Cleaned out of sediment when blow down is done through the low water cut off
Gauge glass• To show water level in steam boiler system
Make up• Tubular high temperature glass• Two isolation valves• Can handle high pressures & temperatures
Normal level is ½ to ¾ full
Cleaned out of sediment when blow down is done through the low water cut off
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Gauge glass & isolation valvesGauge glass & isolation valves
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Steam System ComponentsSteam System Components
Steam pressure gauge
• Pressure ranges from 0-30psi• Compound gauge
30”hg-15”
• Connected to system above the water line
• Mounted with a siphon loop
Steam pressure gauge
• Pressure ranges from 0-30psi• Compound gauge
30”hg-15”
• Connected to system above the water line
• Mounted with a siphon loop
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Steam System ComponentsSteam System Components
Pressure Relief Valve
• Code on all boilers• Mounted above water line• Preset at 15psi• Open on pressure rise• Discharge port should be piped 8”-10” from floor
Pressure Relief Valve
• Code on all boilers• Mounted above water line• Preset at 15psi• Open on pressure rise• Discharge port should be piped 8”-10” from floor
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Steam System ComponentsSteam System Components
Radiator valve
• Each radiator must be equipped with one
• At the bottom (inlet tapping)
Radiator valve
• Each radiator must be equipped with one
• At the bottom (inlet tapping)
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Steam System ComponentsSteam System Components
Supply main
• Carries steam to radiators
• Brings condensate back to the drip connection
• Steam and condensate flow in the same pipe
Supply main
• Carries steam to radiators
• Brings condensate back to the drip connection
• Steam and condensate flow in the same pipe
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Steam System ComponentsSteam System Components
Dry Return
• A portion of the return line is above the water level
• Good location for Main Vent
Dry Return
• A portion of the return line is above the water level
• Good location for Main Vent
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Steam System ComponentsSteam System Components
Drip Connection
• Vertical length of pipe
• Connects the Dry Return and the Wet Return
Drip Connection
• Vertical length of pipe
• Connects the Dry Return and the Wet Return
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Steam System ComponentsSteam System Components
Wet Return
• Carries the condensate back to the boiler
• Below the water line
• Stays full of water not allowing steam to return to the boiler.
Wet Return
• Carries the condensate back to the boiler
• Below the water line
• Stays full of water not allowing steam to return to the boiler.
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Steam System ComponentsSteam System Components
Hartford Loop
• A piping configuration designed as a safety feature
• Ensures water stays in the boiler in the even the Wet Return were to leak
• Works like a Plumbing Trap
Hartford Loop
• A piping configuration designed as a safety feature
• Ensures water stays in the boiler in the even the Wet Return were to leak
• Works like a Plumbing Trap
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Steam System ComponentsSteam System Components