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Table 1: Insulation thickness to BS 5422: 2001
Application	Steel pipe size NB (mm)	Kingspan Kooltherm	Kingspan Kooltherm zero odp	Mineral fibre
Environmental thickness (mm) of insulation	50	20	25	38
for non-domestic hot water	100	25	25	43
(60°C) to control heat loss.	200	30	30	47
Environmental thickness (mm) of insulation	50	20	25	38
for non-domestic heating installations (75°C)	100	25	25	42
to control heat loss.	200	30	30	45
Environmental thickness (mm) of insulation	50	20	25	48
for chilled water supplies (water at 0°C) to	100	25	35	63
control heat gain.	200	35	40	75