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1216.1 Steam Traps
For other than one-pipe steam systems, each heat-distribution unit shall be supplied with a steam trap that is listed for the application.
1216.2 Sloping for Two-Pipe System
Two-pipe steam system piping and heat-distribution units shall be sloped down at not less than 1/8 inch per foot (10.4 mm/m) in the direction of the steam flow.
1216.3 Sloping for One-Pipe System
One-pipe steam system piping and heat-distribution units shall be sloped down at not less than 1/8 inch per foot (10.4 mm/m) towards the steam boiler, without trapping.
1216.4 Automatic Air Vents
Steam automatic air vents shall be installed to eliminate air pressure in heat-distribution units on gravity steam piping systems. Air vents shall not be used on a vacuum system.
1216.5 Condensate Flow
System piping shall be installed to allow condensate to flow to the condensate receiver or steam boiler either by gravity or pump-assisted.
1216.6 Steam-Distribution Piping
Where multi-row elements are installed in an enclosure, they shall be top fed and piped in parallel down to the steam trap. A single steam trap for each row of heating elements shall be installed. Where the size of the return header is increased by a minimum of one pipe size, a single steam trap shall be permitted to be installed for multiple rows. Where multiple steam unit heaters are installed, an individual steam trap for each unit shall be installed.

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