Xylem Bell & Gossett Hoffman Speciality Series Engineering Data Manual page 33

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Piping connections for unit heaters (steam)
SUPPLY LINE
UNIT HEATER
SEDIMENT POCKET
Low pressure closed gravity system
SUPPLY LINE
UNIT HEATER
SEDIMENT POCKET
High pressure system
UNIT HEATER
VENT VALVE
AT LEAST 12" RETURN
CHECK VALVE
UNIT HEATER
VENT VALVE
BUCKET TRAP
STRAINER
SUPPLY MAIN
GATE VALVE
UNIT HEATER
MINIMUM COOLING LEG 5'-0" LONG
FULL SIZE
OF
TRAP
TAPPING
GRAVITY OR VACUUM DRY RETURN MAIN
GRAVITY VACUUM DRY RETURN MAIN
Unit heater connections for two pipe gravity or
vacuum system with supply branch dripped
through trap
SUPPLY LINE
UNIT HEATER
SEDIMENT
POCKET
STRAINER
Vacuum or low pressure open
gravity system
GATE VALVE
UNIT HEATER
SAME SIZE AS TRAP
MINIMUM COOLING LEG 5'-0" LONG
FULL SIZE
OF
TRAP
TAPPING
GRAVITY OR VACUUM DRY RETURN MAIN
GRAVITY VACUUM DRY RETURN MAIN
Unit heater connections for two pipe gravity
or vacuum system
TRAP
SAME SIZE AS TRAP
SUPPLY MAIN