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Heat Loss from Steam Pipes

Amount of condensate generated in steam pipes depends on the heat loss from the pipe to the surroundings

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The heat loss is a function of the pipe size and insulation quality, the steam temperature (pressure) and the surrounding temperature.

Heat loss steam coil - chart

The table below and figure above can be used for estimating heat loss from bare uninsulated horizontal steam pipes - still air conditions - air temperature ranging 50^oF to 70^oF.

Steam Pipes - Heat Loss (W/m)

Heat Loss (Btu/h per ft)
Temperature Difference between Steam and Surrounding Air (^oF)	Dimension (inches)
	1/2	3/4	1	1 1/4	1 1/2	2	2 1/2	3	4	6
100	56	68	82	107	113	138	163	194	243	337
120	71	85	104	127	142	175	206	246	308	427
140	86	104	127	155	173	212	251	300	375	521
160	103	125	152	186	213	256	301	360	451	626
180	121	146	176	217	243	297	351	417	522	725
200	139	171	206	251	282	346	408	488	622	850
225	166	199	243	297	334	410	483	578	726	1009
250	192	233	284	347	389	478	563	674	849	1180
275	220	266	326	398	447	550	649	778	978	1360
300	251	304	372	455	510	628	742	888	1140	1557
325	285	343	425	520	580	705	843	1010	1240	1730
350	322	388	480	590	660	790	945	1130	1358	1930

1 Btu/h per ft = 0.96 W/m

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Related Topics

Steam and Condensate - Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more
Steam - Heat Loss and Insulation - Steam and condensate pipes - heat loss uninsulated and insulated pipes, insulation thickness and more
Heat Loss and Insulation - Heat loss from pipes, tubes and tanks - with and without insulation - foam, fiberglass, rockwool and more

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