LTHW preinsulated system, site 1

125 mm (5 in.) Supply

and Return Pipe

64 mm (2.5 in.)

Figure 7. Construction details for the

100 mm (4 in.) Concrete Slab

Silty Gravelly Sand

2.82 m (9.26 ft)

32 mm (1.25 in.)

Polyurethane Insulation

Figure 8. Construction details for the LTHW site 1.

LTHW preinsulated system, site 2

LTHW preinsulated system, site 1

The pre-insulated piping system used at Ft. Irwin

consists of schedule 40 steel pipes. At Ft. Irwin Site 1

Irwin Site 1, but is of a different size (Fig. 9). At Ft.

the supply and return pipes are of approximately

Irwin Site 2 the supply and return pipes are ap-

150-mm diameter (6-in. NPS). These pipes are insu-

proximately 75 mm in diameter (3-in. NPS). These

lated with a polyurethane foam insulation of ap-

pipes are insulated with a polyurethane foam insu-

proximately 32 mm (1.25-in.) thickness. Each insu-

lation of approximately 32-mm (1.25-in.) thickness.

lated pipe is encased in its own fiberglass-reinforced

Each insulated pipe is encased in its own fiberglass-

plastic (FRP) jacket, which is approximately 2.5 mm

reinforced plastic (FRP) jacket, which is approxi-

(0.10 in.) thick. The jacket has an outer diameter of

mately 2.5 mm (0.10 in.) thick. The jacket has an

approximately 240 mm (9.4 in.). The insulation was

outer diameter of approximately 160 mm (6.25 in.).

"foamed-in-place," thus allowing for no air space

Again the insulation was "foamed-in-place" so that

between the pipe insulation and inside of the jacket.

no air space exists between the pipe insulation and

Figure 8 shows the construction details of both of

inside of the jacket.

the LTHW sites.

14