MIL-HDBK-1003/8A
Change 2, 30 December 1991
Page
2.3.6.1
Heat Loss Formulas. . . . . . . . . . . . . .
.
.
.
.
.
8
2.3.6.2
Heat Loss and Cost Relationship . . . . . . .
.
.
.
.
.
10
2.4
Federal Agency Approved System Suppliers. . .
.
.
.
.
.
10
2.4.1
Class A, B, C, and D Ground Water Conditions.
.
.
.
.
.
10
2.4.2
Class B, C, and D Ground Water Conditions . .
.
.
.
.
.
10
3.1
Design Responsibilities for Underground
Pre-engineered Heat Distribution Systems. .
...
.
.
14
3.1.1
Design by Project Designer. . . . . . . . . .
...
.
.
14
3.1.2
Design by System Supplier . . . . . . . . . .
...
.
.
14
3.2
Distribution Site Location. . . . . . . . . .
...
.
.
15
3.2.1
Location Factors. . . . . . . . . . . . . . .
...
.
.
15
3.2.2
Subsurface Explorations . . . . . . . . . . .
...
.
.
15
3,2,2,1
Timing of Survey. . . . . . . . . . . . . . .
...
.
.
15
3.2.2.2
Time of Year. . . . . . . . . . . . . . . . .
...
.
.
15
3.2.2.3
Exploration Considerations. . . . . . . . . .
...
.
.
15
3.2.2.4
Test Explorations . . . . . . . . . . . . . .
...
.
.
15
3.2.2.5
Depth of Exploration. . . . . . . . . . . . .
...
.
.
19
3.2.2.6
Special Ground Considerations . . . . . . . .
...
.
.
19
3.2.2.7
Permeability Tests. . . . . . . . . . . . . .
...
.
.
19
3.2.2.8
Test Results. . . . . . . . . . . . . . . . .
...
.
.
19
3.2.2.9
Soil Resistivity. . . . . . . . . . . . . . .
...
.
.
19
3.2.2.10
Soil Corrosiveness Classification . . . . . .
...
.
.
20
3.2.2.11
Soil Stability. . . . . . . . . . . . . . . .
...
.
.
20
3.2.2.12
Soil Load-Bearing Capacity. . . . . . . . . .
...
.
.
20
3.2.3
Site Classification . . . . . . . . . . . . .
...
.
.
20
3.2.3.1
Class A, Severe . . . . . . . . . . . . . . .
...
.
.
20
3.2.3.2
Class B, Bad. . . . . . . . . . . . . . . . .
...
.
.
20
3.2.3.3
Class C, Moderate . . . . . . . . . . . . . .
...
.
.
21
3.2.3.4
Class D, Mild . . . . . . . . . . . . . . . .
...
.
.
21
3.2.4
Analyzing Site Classification for Application
of
Pre-Engineered Underground System . . . . .
...
. . 21
3.2.5
Analyzing Site Classification for Application
of
Shallow Concrete Trench System. . . . . . .
...
.
.
21
3.2.5.1
Soils . . . . . . . . . . . . . . . . . . . .
...
.
.
21
3.2.5.2
Settlement of Trenches. . . . . . . . . . . .
...
.
.
22
3.2.5.3
Under-Trench Drainage Systems . . . . . . . .
...
.
.
22
3.2.6
Reinforced Thermosetting Resin Plastic (RTRP)
Pipe.
.
.
23
3.3
Service and Loads . . . . . . . . . . . . . .
...
.
.
23
3.3.1
Alternate Routes. . . . . . . . . . . . . . .
...
.
.
23
3.3.2
Pressure Drop . . . . . . . . . . . . . . . .
...
.
.
23
3.3.3
Obstacles . . . . . . . . . . . . . . . . . .
...
.
.
23
3.3.4
Future Loads. . . . . . . . . . . . . . . . .
...
.
.
23
3.3.5
Distribution Circuits . . . . . . . . . . . .
...
.
.
24
3.3.6
Route Types . . . . . . . . . . . . . . . . .
...
.
.
24
3.3.6.1
Through Buildings . . . . . . . . . . . . . .
...
.
.
24
x
Previous Page
