2000 Hook-up Book

Steam Tracing

this should be done in the hori zontal plane, Fig. 16b. Where it is essential to main tain the flow of heat to the product, the tracer should be taken up to the back of the flange Fig. 17, and the coupling should always be on the center line of the flanged joint. The same applies to an in line run where the tracer has to be jointed. This can be done in two ways, Fig. 18 or Fig. 19. Each of these is preferable to Fig. 20 which could produce a cold spot. Where two tracers are used it can be better to double back at a union or flange as Fig. 21, rather than jump over it. Expansion Expansion in tracer lines is often overlooked. Naturally the steam heated tracer will tend to expand more than the product line. Where the tracer has to pass around flanges, the bends are quite adequate to take care of the expansion, Fig. 22. But where this does not occur and there is a long run of uninter rupted tracer, it is essential to provide for expansion which can be done by forming a complete loop, Fig. 23.

Table 7: Steam Connection Size for Jacketed Lines Product Jacket Steam Line Diameter Connection 2-1/2" 65mm 4" 100mm 1/2" 15mm 3" 80mm 6" 150mm 3/4" 20mm 4" 100mm 6" 150mm 3/4" 20mm 6" 150mm 8" 200mm 3/4" 20mm 8" 200mm 10" 250mm 1" 25mm 10" 250mm 12" 300mm 1" 25mm

SYSTEM DESIGN

General Installation

Fall

Steam

Figure 13 Single and Multiple Tracing

Steam Trap

Steam Trap

Figure 12a Jacketed Lines, Drained Separately

Steam

Fall

13b

13a

13c

Steam

Steam Trap

Figure 12b Jacketed Lines, Connected

Steam Trap

Figure 14 Multiple Tracing

Figure 12c Incorrect Arrangement of Jacketed Lines

Figure 15 Vertical Tracing

Figure 17

Figure 21 Dual Tracer Double Back

15b

15a

Figure 18

Figure 22

Correct Arrangement Figure 19 for Tracer-line Joints

Figure 16a Incorrect Arrangement

Figure 23 Expansion Arrangements on Long Tracers

Figure 20 Incorrect Arrangement

Figure 16b Correct Arrangement

15