Heat Losses From Bare and Insulated Pipe

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Heat Losses From Bare and Insulated Pipe

Heat Loss in Btu/h/ft Length of Fiberglass Insulation and Bare Pipe, ASJ Cover 150°F Temperature of Pipe Horizontal

NPS	½		¾		1		1¼		1½		2		2½		3		4		5		6		8
Thk	HL	BTU/h/ft length
Bare	36		44		54		67		75		92		110		131		165		200		235		299
½"	10	92	10	90	13	93	20	98	18	94	20	93	23	94	30	95	36	95	43	95	53	97	68	97
1"	7	86	8	87	9	86	11	88	11	87	13	87	15	88	18	88	22	88	27	89	32	89	38	89
1½"	5	84	6	84	7	84	8	84	9	85	10	85	10	84	14	85	17	86	20	86	23	86	28	8
2"	5	82	5	83	6	83	7	83	7	83	9	83	9	83	11	84	14	84	16	84	18	84	23	85

Vertical

Thk	½		¾		1		1¼		1½		2		2½		3		4		5		6		8
Thk	HL	BTU/h/ft length
Bare	32		40		49		61		69		84		100		120		152		185		217		277
½"	9	92	10	90	13	93	19	99	18	95	20	94	23	94	30	96	35	96	43	96	52	97	67	98
1"	7	86	8	87	9	86	11	88	11	87	13	88	15	88	18	89	22	89	26	89	31	90	38	89
1½"	5	84	6	84	7	84	8	84	9	85	10	85	10	84	14	86	16	86	20	86	23	87	28	8
2"	5	83	5	83	6	83	7	83	7	83	9	83	9	83	11	84	14	84	16	85	18	85	23	85

Source: Courtesy Owens/ Corning

Notes: 80 deg. Ambient Temperature, 0 wind velocity, 0.85 Bare surface emmittance, 0.90 Surface emmittance, HL = Heat Loss (BTU/h/ft length), ST = Surface temperature (deg. F), Bare = Bare pipe, iron pipe size, Thk = Thickness

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