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Steam Pipes - Heat Loss over a Year

Yearly heat loss in amount of coal or oil consumption for insulated and uninsulated steam pipes at different dimensions and operation times

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Yearly heat loss per meter pipe line is estimated for steam pipes with pressure 6.5 bar (7.5 bar abs, 168^oC) and surrounding air temperature 20^oC.

Increasing the steam pressure increases the temperature and influences energy consumption and heat loss.

Pipe dimension (mm)	Heat Loss (W/m)	Production time (hours)	Fuel Consumption
			Coal (kg/m)		Oil (kg/m)
			Uninsulated	Insulated	Uninsulated	Insulated
25	313	2000	119	30	59	15
		6000	357	89	178	45
		8400	505	126	253	64
32	430	2000	166	42	82	21
		6000	500	125	265	62
		8400	699	174	349	88
50	529	2000	202	50	101	25
		6000	607	152	303	76
		8400	755	189	378	92
80	748	2000	297	74	149	37
		6000	892	223	446	111
		8400	1249	312	625	156
100	940	2000	327	82	164	42
		6000	981	245	491	131
		8400	1517	379	758	190

Steam properties
1 W/m = 1.04 Btu/h per ft
1 in = 25.4 mm

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