Engineering Tables

MATERIAL PROPERTIES

CHARACTERISTIC
TEST
RESULTS
Color
Visual
Black
Hardness
ASTM D2240-84
(test averages)
(See Table 4)
at -30° Fahrenheit
D70.6
at 73° fahrenheit
D63.5
at 116° fahrenheit
D55.1
Ultimate Compressive Strength
ASTM D695-91
(test averages)
(See Table 5)
at -30° fahrenheit
5857 psi
at 73° fahrenheit
5505 psi
at 130° fahrenheit
5311 psi
Ultimate Flexural Strength (Yield)
ASTM D790-86
(test averages)
(Procedure B)
at -30° fahrenheit
4961 psi
at 73° fahrenheit
4240 psi
at 130° fahrenheit
2641 psi
Modules of Elasticity
(Averages based on Flexure)
at -30° fahrenheit
36.6×104 psi
at 73° fahrenheit
28.0×104 psi
at 130° fahrenheit
14.1×104 psi

psi: pounds per square inch

STANDARD BASES


SMALL BASE
MEDIUM BASE
LARGE BASE
Dimensions (inches)
9 3/4″x15 3/4″
12″x12″
18″x18″
Base Area
154 sq. inches
144 sq. inches
324 sq. inches
Weight (base only)
4.3 pounds
3.7 pounds
7.8 pounds

psi: pounds per square inch

MAXIMUM ALLOWABLE LOADING BY PIPE HANGER

DECK INSULATION
STRESS
SMALL BASE
MEDIUM BASE
LARGE BASE
Expanded Polystyrene
5 psi
770 pounds
720 pounds
1,620 pounds
Glass/Mineral Fiber
5 psi
770 pounds
720 pounds
1,620 pounds
Polyisocyanurate
5 psi
770 pounds
720 pounds
1,620 pounds
Extruded Polystyrene
6 psi
924 pounds
864 pounds
1,944 pounds
Fiber Board
6 psi
924 pounds
864 pounds
1,944 pounds
Perlite
7.5 psi
2,695 pounds
2,520 pounds
5,670 pounds
Cellular Glass
50 psi
7,700 pounds
7,200 pounds
16,200 pounds

Please note that the placement of individual bases must be reviewed by a Structural Engineer to ensure that the roof structure is not overloaded.

Based on a factor of safety of 2 against published minimum ultimate values of insulation compression strength (NRCA Commercial Low-Slope Roofing Materials Guide, 1994 Edition). Designer must also ensure adequacy against punching resistance and overall structural integrity of the roof on which the assembly is placed. Resultant stresses from lateral loads on pipes may result in higher stresses in substrate than plain gravity loads.

HARDNESS TEST VALUES

TEST NUMBER
TEST SPECIMEN TEMPERATURE
-30°F
73°F
130°F
1
70.4
63.6
55
2
70.8
63
55.6
3
70.6
63.8
54.8
Average
70.6
63.5
55.1

°F: degrees Fahrenheit

ULTIMATE COMPRESSION STRENGTHS Test Method: ASTM D695-91

TEST NUMBER
TEST SPECIMEN TEMPERATURE
-30°F
73°F
130°F
1
5,592 psi
5,524 psi
5,380 psi
2
5,880 psi
5,548 psi
5,212 psi
3
6,100 psi
5,444 psi
5,340 psi
Average
5,857 psi
5,505 psi
5,311 psi

°F: degrees Fahrenheit
psi: pounds per square inch

FLEXURAL STRESSES

TEMPERATURE DURING TEST
-30°F
73°F
130°F

Fb (psi)
Ex104 (psi)
Fb (psi)
Ex104 (psi)
Fb (psi)
Ex104 (psi)
1
5,210
36.2
4,485
35.2
3,031
14.8
2
4,608
35
4,030
22.5
2,497
18.5
3
5,064
38.6
4,205
26.3
2,394
9.1
Avg
4,961
36.6
4,240
28
2,641
14.1

°F: degrees Fahrenheit
psi: pounds per square inch
Avg: average
Failure as no increase in load capacity
Fb: Maximum Stress in Extreme Fiber in Bending
Fb: 3PmaxL/2bh3
L: span length (16 inches)
b: beam width (6 inches)
h: beam height (1.25 inches)
E: Modules of Elasticity
Lease values of tests

ULTIMATE PUNCHING SHEAR RESISTANCE LOADS (Pounds/Inch Deflection)

BASE TYPE
TEST #
TEMPERATURE OF TEST SPECIMEN
-30°F
73°F
130°F
Small Base
Posts 1
4,980/.20
9,910/.23
8,560/.6
(15 3/4″x9 3/4″)
Pipe Support 2
6,180/.30
9,850/.21
9,640/.6
at -30° fahrenheit
3
5,270/.23
9,870/.22
7,740/.6
Medium Base
1
9,980/.43
9,000/.63
7,630/.10
(12″x12″)
2
9,910/.43
9,670/.63
7,480/.10
at -30° fahrenheit
3
9,930/.34
9,960/.58
9,340/.10
Large Base
1
7,700/.71
6,400/1.1
4,810/1.0
(18″x18″)
2
9,350/.96
6,550/.96
6,130/1.42
(test averages)
3
8,810/.82
7,220/1.38
5,580/1.28
Small Base
Roller 1
4,030/.16
3,510/.15
3,180/.22
(15 3/4″x9 3/4″)
Pipe Support 2
3,550/.26
4,110/.18
2,790/.21
3
3,580/.20
3,890/.16
3,280/.26
Small Base
Roller 1
3,060/.23
3,070/.36
2,900/.50
(15 3/4″x9 3/4″)
Pipe Support 2
3,420/.24
3,220/.24
2,900/.46
3
2,960/.30
2,960/.31
3,000/.44

NOTE: The deflection noted in the values for the roller and beam pipe support are a combination of deflection of the pipe support assembly and the pipe hanger base.

#: Number
°F: degrees Fahrenheit

TYPICAL ROOF LOADS AND RESULTING GRAVITY (Only Bearing Stresses)

Small Size Portable Pipe Hanger Assembly

Base Dimensions: 9 3/4″x15 3/4″
Base Weight: 4.3 lb each, measured
Frame Weight: 9 lb, assumed
Pipe Hanger Weight: (4 to 6″): 4 lb each
PIPE SIZE
# OF PIPES
CONTENTS
OF PIPE
SPACING OF PIPE SUPPORTS
6 FOOT
8 FOOT
10 FOOT
4 inch
2
WATER
115 lb. (0.75 psi)
147 lb. (0.96 psi)
177 lb. (1.15 psi)
6 inch
2
WATER
207.3 lb. (1.35 psi)
267.3 lb. (1.74 psi)
327.3 lb. (2.13 psi)

psi: pounds per square inch
lb: pounds

TYPICAL ROOF LOADS AND RESULTING GRAVITY (Only Bearing Stresses)

Medium Size Portable Pipe Hanger Assembly

Base Dimensions: 12″x12″
Base Weight: 8 lb each assumed, 3.71 lb measured, 16 lb per assembly
Frame Weight: 9 lb
Pipe Hanger Weight: (4 to 6″): 4 lb each
PIPE SIZE
# OF PIPES
CONTENTS
OF PIPE
SPACING OF PIPE SUPPORTS
6 FOOT
8 FOOT
10 FOOT
4 inch
1
GAS
94 lb. (0.36 psi)
115 lb. (0.44 psi)
139 lb. (0.53 psi)
WATER
127 lb. (0.49 psi)
159 lb. (0.61 psi)
189 lb. (0.73 psi)
2
GAS
163 lb. (0.63 psi)
205 lb. (0.79 psi)
253 lb. (0.97 psi)
WATER
229 lb. (0.88 psi)
293 lb. (1.1psi)
353 lb. (1.4 psi)
3
GAS
232 lb. (0.89 psi)
295 lb. (1.1 psi)
367 lb. (1.4 psi)
WATER
331 lb. (1.3 psi)
427 lb. (1.7 psi)
519 lb. (2.0 psi)
6 inch
1
GAS
139 lb. (0.53 psi)
179 lb. (0.69 psi)
219 lb. (0.84 psi)
WATER
219 lb. (0.84 psi)
279 lb. (1.1 psi)
339 lb. (1.3 psi)
2
GAS
253 lb. (0.97 psi)
333 lb. (1.3 psi)
413 lb. (1.6 psi)
WATER
413 lb. (1.6 psi)
533 lb. (2.1 psi)
653 lb. (2.51 psi)
3
GAS
376 lb. (1.4 psi)
487 lb. (1.9 psi)
607 lb. (2.3 psi)
WATER
607 lb. (2.33 psi)
787 lb. (3.0 psi)
967 lb. (3.7 psi)

psi: pounds per square inch
lb: pounds

TYPICAL ROOF LOADS

Large Size Portable Pipe Hanger Assembly

Nominal Base Dimensions: 18″x18″ (calculations based on 17″x17″)
Base Weight: 13 lb each, 26 per assembly
Frame Weight: 16 lb
Pipe Hanger Weight: 4 lb each (4 and 6″); 16 lb each (8″); 20 lb each (est) (10″ and 12″)
PIPE SIZE
# OF PIPES
CONTENTS
OF PIPE
SPACING OF PIPE SUPPORTS
6 FEET
8 FEET
10 FEET
4 inch
1
GAS
111 lb. (0.19 psi)
132 lb. (0.23 psi)
156 lb. (0.27 psi)
WATER
144 lb. (0.25 psi)
176 lb. (0.31 psi)
206 lb. (0.36 psi)
2
GAS
180 lb. (0.32 psi)
222 lb. (0.39 psi)
270 lb. (0.47 psi)
WATER
264 lb. (0.43 psi)
310 lb. (0.54 psi)
376 lb. (0.65 psi)
3
GAS
249 lb. (0.44 psi)
312 lb. (0.55 psi)
384 lb. (0.67 psi)
WATER
348 lb. (0.61 psi)
444 lb. (0.78 psi)
534 lb. (0.94 psi)
6 inch
1
GAS
156 lb. (0.27 psi)
196 lb. (0.34 psi)
236 lb. (0.41 psi)
WATER
236 lb. (0.41 psi)
296 lb. (0.52 psi)
356 lb. (0.62 psi)
2
GAS
270 lb. (0.47 psi)
350 lb. (0.61 psi)
430 lb. (0.75 psi)
WATER
430 lb. (0.75 psi)
550 lb. (0.96 psi)
670 lb. (1.2 psi)
3
GAS
384 lb. (0.67 psi)
504 lb. (0.88 psi)
624 lb. (1.1 psi)
WATER
624 lb. (1.1 psi)
804 lb. (1.4 psi)
984 lb. (1.7 psi)
8 inch
1
GAS
228 lb. (0.40 psi)
288 lb. (0.51 psi)
348 lb. (0.61 psi)
WATER
358 lb. (0.63 psi)
458 lb. (0.80 psi)
558 lb. (0.98 psi)
2
GAS
414 lb. (0.73 psi)
534 lb. (0.94 psi)
654 lb. (1.2 psi)
WATER
674 lb. (1.2 psi)
874 lb. (1.5 psi)
1,074 lb. (1.9 psi)
10 inch
1
GAS
302 lb. (0.53 psi)
382 lb. (0.67 psi)
472 lb. (0.83 psi)
WATER
512 lb. (0.90 psi)
662 lb. (1.2 psi)
812 lb. (1.4 psi)
2
GAS
562 lb. (0.99 psi)
722 lb. (1.3 psi
902 lb. (1.6 psi)
WATER
982 lb. (1.7 psi)
1,282 lb. (2.2 psi)
1,582 lb. (2.8 psi)
12 inch
1
GAS
362 lb. (0.64 psi)
462 lb. (0.81 psi)
562 lb. (0.99 psi)
WATER
652 lb. (1.1 psi)
852 lb. (1.5 psi)
1,052 lb. (1.8 psi)

psi: pounds per square inch
lb: pounds

LOADS: STANDARD GALVANIZED PIPE

PIPE DIAMETER (NOMINAL)
CONTENTS
WEIGHT
(pipe and contents only)
SPACING OF PIPE SUPPORTS
6 FEET
8 FEET
10 FEET
4 inch
GAS
10.79 plf
65 lb
86 lb
110 lb
WATER
16.30 plf
98 lb
130 lb
160 lb
5 inch
GAS
14.62 plf
88 lb
117 lb
150 lb
WATER
23.28 plf
140 lb
190 lb
230 lb
6 inch
GAS
18.98 plf
110 lb
150 lb
190 lb
WATER
31.49 plf
190 lb
250 lb
310 lb
8 inch
GAS
28.56 plf
170 lb
230 lb
290 lb
WATER
50.24 plf
300 lb
400 lb
500 lb
10 inch
GAS
40.50 plf
240 lb
320 lb
410 lb
WATER
74.60 plf
450 lb
500 lb
750 lb
12 inch
GAS
49.60 plf
300 lb
400 lb
500 lb
WATER
98.60 plf
590 lb
790 lb
990 lb

ROOF DECK INSULATION COMPRESSION STRENGTH

INSULATION TYPE
UNIT WEIGHT
COMPRESSIVE STRENGTH
Expanded Polystyrene
1.0 pcf
10 to 14 psi
1.25 pcf
13 to 18 psi
1.5 pcf
15 to 21 psi
2.0 pcf
25 to 33 psi
Extruded Polystyrene
1.3 to 4.1 pcf
12 to 60 psi
Glass Fiber/Mineral Fiber
10 to 15 pcf
10 psi
Cellular Glass
8.5 pcf
100 psi
Fiberboard
12 to 18 psi
Perlite
10 to 13 pcf
35 to 40 psi
Polyisocyanurate
10 to 25 psi

Source: National Roofing Contractors Association, Commercial-Low Slope Roofing Materials Guide, 1994 Edition

psi: pounds per square inch
pcf: pounds per cubic foot