Page 280 - Applied Process Design For Chemical And Petrochemical Plants Volume III

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242 Applied Process Design for Chemical and Petrochemical Plants

Heat transfer cements are quite useful for transferring the
nD o
Q ia U o 1T ap T a 2 (10-265)
12 heat from an external tracing when attached outside of the
Table 10-45 presents types of insulation material. Foo 223 process pipe, Figures 10-167 and 10-168. To determine the
number of heat transfer steam tracers, it is important to con-
gives insulation thermal conductivity, k, at 100°F mean as:
tact the manufacturer of the heat transfer cement. The illus-
trations here should be considered preliminary for
Calcium silicate 0.38 Btu/(hr)(ft)(F)
approximating purposes. The information/data that follows is
Foam glass 0.40
used with permission from Thermon ® Manufacturing
Mineral wool 0.28
Co./Cellex Div. Except for specific conditions, most applica-
tions represent the requirements to maintain a pipe (or vessel)
system temperature, not to raise or lower the temperature.

Figure 10-167. Tracer placement on pipe using heat transfer cement. (Used by permission: Bul T-109M ©1994. Thermon Manuifacturing
®
Co./Cellex Div.)
Table 10-45
Insulation Material and Thickness

Temp. Ranges, °F and Recommended Insulation Thicknesses, in.
Mineral Wool & Calcium Silicate Foam Glass

Pipe Size NPS 100—199 200—399 400—599 600—699 700—799 100—390 Up to 390
normal fire protn.
1
1
1
1 1 1 / 2 2 2 2 / 2 1 / 2 3
1 1 1 2 2 1 1 3
1 / 2 1 / 2 2 / 2 1 / 2
2 1 / 2 1 / 2 2 / 2 2 / 2 3 1 / 2 3
1
1
1
1
1
1
1
1
3 1 / 2 1 / 2 2 / 2 3 3 1 / 2 3
1
1
1
4 1 / 2 1 / 2 2 / 2 3 4 1 / 2 3
1
1
1
1
1
1
6 1 / 2 1 / 2 2 / 2 3 4 1 / 2 3
1
8 2 2 2 / 2 3 4 2 3
10 2 2 2 / 2 3 5 2 3
1
12 2 2 3 3 5 2 3
1
14 2 2 3 4 5 / 2 2 3
16 2 2 3 4 5 / 2 2 3
1
18 2 2 3 4 5 / 2 2 3
1
1
20 2 2 3 4 5 / 2 2 3
24 2 2 3 4 5 / 2 2 3
1
30 2 2 3 4 5 / 2 2 3
1
36 2 2 3 4 5 / 2 2 3
1
Used by permission: Foo, K. W. Hydrocarbon Processing, V. 73, No. 1, ©1994. Gulf Publishing Company. All rights reserved.)