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© 2018, Design by REMARS - Consulting Engineers Team
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Insulation thicknesses – pipework, ductwork

1. LTHW Heating, Condenser Cooling Water, Dry Cooler Circuits (up to 85°C)

THICKNESS BASED ON BS5422 TABLES 12 & 13
NOMINAL PIPE SIZE (mm)MINERAL WOOL THICKNESS (mm)
1525
2025
2525
3230
4030
5030
6530
8030
10030
12540
15040
20040
25040
300 and above40
flat surfaces40

2. Domestic Hot Water Services

THICKNESS BASED ON BS5422 TABLES 15
NOMINAL PIPE SIZE (mm)MINERAL WOOL THICKNESS (mm)
1525
2030
2530
3230
4030
5030
6540
8040
10040
12540
15040
flat surfaces50

3. Internal Cold Water Services, Chilled Water Services and Fire Protection Services - Protection from Freezing, Including Cold Water Feeds and Vents

THICKNESS BASED ON BS5422 TABLES 12 & 13
NOMINAL PIPE SIZE (mm)MINERAL WOOL THICKNESS (mm) INDOORS (1 & 2)
1560
2050
2530
3230
4030
5030
6530
8030
10025
12525
15025
20025
25025
300 and above25
flat surfaces25

• Indoor installations include roof spaces, ventilated ground floor voids and unheated basements etc.;

• Also includes hot services that operate intermittently located in spaces in (1) above.

The above thicknesses comply with or exceed the requirements of Byelaw 49 of the Water Supply Byelaws ad BS 6700 1987.

4. Internal Cold Water Services, Chilled Water Services and Rainwater Pipes to Prevent Condensation

THICKNESS BASED ON BS 5422 TABLE 7
NOMINAL PIPEMINERAL WOOL THICKNESS (mm)
SIZE (mm)10OC*5OC*0OC*
15202530
20202530
25203040
32203040
40203040
50253040
65253040
80253040
100304050
125304050
150305060
200305060
250405060
300405060
flat surfaces406080

* Temperature and contents

10ºC – Cold water services

5ºC – Chilled water services

0ºC – Rainwater pipes

Cold water storage tanks, including feed and expansion tanks.

• All flat sided tanks – 50mm thick;

• All externally flanged tanks – 80mm thick applied in two layers, each 40mm thick.

5. Ductwork Carrying Warm Air

THICKNESS BASED ON BS 5422 TABLE 16
TEMPERATURE DIFFERENCE BETWEEN AIR IN DUCT AND AMBIENT STILL AIRMINERAL WOOL THICKNESS (mm)
+10K40
+25K50
+20K60

6. Ductwork Carrying Chilled Air (Condensation Control)

THICKNESS BASED ON BS 5422 TABLE 17
MINIMUM AIR TEMPERATURE INSIDE DUCTMINERAL WOOL THICKNESS (mm)
150C – 200C25
100C – 140C40
50C – 90C60
00C – 40C70

7. Refrigeration Pipework for Condensation Control

APPLICATIONREFRIGERANT
PIPE O/D
ARMAFLEX INSULATION THICKNESS (mm) THICKNESS BASED ON BS 5422 TABLE 2 FO
NORMAL CONDITIONS.
MILD CONDITIONS AMBIENT 20ºC   R.H 60%NORMAL CONDITIONS AMBIENT 20ºC R.H 70%*SERVE CONDITIONS AMBIENT 25ºC R.H 80%
Down to minus 18ºC15 to 114mm191932
 Above 114mm and other flat sheet applications 19192545
Down to -30oC15 to 114mm193238
 Above 114mm and other flat sheet applications 19193264
Down to -40oC15 to 114mm253249
 Above 114mm and other flat sheet applications 25324173

* Unless otherwise indicated, normal conditions are to be applied.

• Liquid refrigeration pipes external to buildings and subject to solar radiation shall have a reflective or light coloured finish applied to the “Armaflex” insulation.

At REMARS, we use industry standards, regulations to help measure effective insulation thicknesses of pipework / ductwork. Call us or send us email to help you properly size insulation thicknesses.

Get in touch…

we can help you get an accurate Insulation Thicknesses of ductwork / pipework for your next project.

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