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)
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

1 ft (foot) = 0.3048 m
1 in (inch) = 25.4 mm

Condensate pipe lines - gravity capacity

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Gravity Return Condensate Pipes - Capacities

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

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