Gravity Return Condensate Pipes - Capacities

Max. capacities (lb/hour) in gravity condensate return lines.

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The table below can be used for vented pipe lines where condensate is recovered by gravity.

Values are calculated with Manning's Formula for Gravity Flow with roughness coefficient 0.015 and 50% filled ANSI Schedule 40 steel pipes. Note that the capacities for 100% filled pressurized condensate pipes are higher.

Maximum Condensate Capacity for Gravity Returns (lb/hr) Load Calculator!
Nominal Pipe Size (inches)	Pitch of pipe (ft/100 ft* of length, m/100 m of length)*
Nominal Pipe Size (inches)	0.5	1	2	3	5	10	20
1	371	524	741	908	1172	1657	2344
1 1/4	768	1087	1537	1882	2430	3437	4860
1 1/2	1155	1634	2311	2830	3654	5167	7307
2	2260	3196	4520	5536	7147	10107	14293
3	6462	9139	12925	15929	20436	28901	40872
4	13215	18689	26430	32370	41790	59100	83580
5	24212	34241	48424	59307	76565	108280	153131
6	39646	56067	79291	97111	125370	177300
8	82819	117123	165637	202863	261896	370376
10	152141	215160	304182	372668	481112
12	240983	340801	481965	590285	762054

Condensate Generated in Cold Steam Pipes - SI Units - Huge amounts of condensate are generated when cold steam pipes are heated up must be drained from the pipes.
Condensate Generated in Cold Steam Pipes - Sizing of Steam Traps - When cold steam pipes are heated up they generate huge amounts of condensate that must be drained away from the pipe through steam traps - in Imperial Units.
Condensate Pipe Lines - Capacities (kW) - Maximum capacities for condensate pipe lines in kW steam consumption.
Condensate Pipe Lines - Friction Resistance Imperial Units - Friction or major resistance in condensate pipe lines.
Condensate Pipe Lines - Sizing - Flow and pressure loss in condensate return lines - SI Units.
Condensate Pipes - Flash Steam Generated - Calculate flash steam generation in condensate pipe lines.
Condensate Pumping - High temperatures and danger of impeller cavitation is the major challenge for condensate pumping in steam systems.
Insulated Steam Pipes - Condensate Generated - Heat loss from steam pipes generates condensate which must be drained from the system - imperial units.
Insulated Steam Pipes - Condensate Generated (kg/h per 100m) - Heat loss from steam pipes generates condensate which must be drained from the system.
Steam Pipes - Installation of Drip Legs - Properly draining steam pipes for condensate.