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)

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