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Adjustable Support Bridge Assemblies for 17" Circular Base

Subject:
Engineering Calculations for Pipe Support Systems
as manufactured by Advanced Support Products, Inc.
Utilizing 17” Circular Base
August 12, 2003

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Report done by:
Moreno Engineering, Inc.
1521 Kingwood Drive, Suite 190
Kingwood, Texas 77339

(fig. 1) Pipe Support Design Uplift Resistance
(figs. 2, 3 & 4) Typical Roof Loads Due to Gravity Bearing Stresses
(fig. 2) Minimum Pipe Hanger Assembly
(fig. 3) Medium Pipe Hanger Assembly
(fig. 4) Maximum Pipe Hanger Assembly
(fig. 5) Product Information – 17" Circular Bases

After carefully reviewing the above mentioned products, we have concluded that the products as stipulated in this report meet or exceed the roof type pipe supports for similar applications.

The data utilized for these calculations was obtained from Unistrut for the structural assemblies and from Grinnell for the pipe hangers. The information for the 17” circular injected molding plastic base was obtained from Advanced Support Products, Inc. product data.

The calculations performed are limited and only indicate the static loads that would be exerted on a roof deck by the support assemblies including standard sections of single or multiple lengths of pipe conveying natural gas or water.

The piping and hanger assemblies mentioned herein are considered “dead” loads and should be taken into account during the structural design of the roof system. The hanger assembly loads in the attached tables are intended to be used by the structural designer and provide the information required to properly evaluate the complete roof system.

The products and their characteristics as noted herein were tested by Advanced Support Products, Inc. and represent the basis for our calculations. Roof membrane system analysis as well as long term performance of the products was not part of the calculation process. The following assumptions were taken into account for the calculations:

  • Placement of load on pipe supports was assumed to be symmetrical
  • Performance of the products at other than static loading was not part of the calculation process.
  • Hanger assemblies and piping were assumed to be placed on a horizontal surface and pipe supports are normal to piping.

Conclusions:

Based on our inspection and analysis of the product design, the load capacity values at each point of support of the pipe hanger assemblies, including the weight of piping are all less than the maximum allowable stresses for typical roof deck insulation types currently in use (5 psi maximum). Therefore, the Pipe Support Systems utilizing 17” circular bases as manufactured by Advanced Support Products, Inc. meet Factory Mutual Research Corporation’s recommendation stipulating that the design uplift resistance for an adhered base should not exceed half of the ultimate design uplift resistance of the roof cover system. The uplift resistance of any roof system is therefore dependent on the uplift rating of the roof cover system.

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(fig. 1) Pipe Hanger Design Uplift Resistance


Advanced Support Products, Inc.
Circular Base  Uplift Resistance
Base Size (inches) BASE AREA (SQ.IN.) FM Wind Uplift Rating (PSF)
    60 90 150 180
12” x 12” (ref.) 144 30 45 75 90
17" diameter 227 47 71 118 142
** FACTORY MUTUAL RATINGS (LBS PER SQ. FT.)

(fig. 2) Typical Roof Loads Due to Gravity Bearing Stresses

(Minimum Pipe Hanger Assembly) 4 Base System

17" Circular Base Area: 908 sq.in.
17" Circular Base Weight: 20.0 lbs.
Frame Weight: 29.0 lbs.
Hanger Weight: 08.0 lbs.
Assembly Weight: 57.0 lbs. 1 pipe
86.0 lbs. 2 pipes

Pipe Diameter Quantity Pipe Contents Pipe Support Spacing
6 feet 8 feet 10 feet
4 inch 1 water 155.0 lbs 187.0 lbs. 217.0 lbs
0.17 psi 0.21 psi 0.24 psi
2 water 282.0 lbs 346.0 lbs 406.0 lbs
0.31 psi 0.38 psi 0.45 psi
6 inch 1 water 247.0 lbs 307.0 lbs 367.0 lbs
0.27 psi 0.34 psi 0.40 psi
2 water 466.0 lbs 586.0 lbs 706.0 lbs
1.51 psi .65 psi 0.78 psi

The bearing stresses indicated above reflect utilization of an assembly consisting of 2 Cross Braces, 2 each Channel Legs and 2 each Cross Bars.

(fig. 3) Typical Roof Loads Due to Gravity Bearing Stresses

(Medium Pipe Hanger Assembly) 4 Base System

17" Circular Base Area: 908 sq.in.
17" Circular Base Weight: 20.0 lbs.
Frame Weight: 29.0 lbs.
Hanger Weight: 08.0 lbs.
Assembly Weight: 57.0 lbs. 1 pipe
86.0 lbs. 2 pipes
112.0 lbs. 3 pipes

Pipe Diameter Quantity Pipe Contents Pipe Support Spacing
6 feet 8 feet 10 feet
4 inch 1 Gas lbs
psi 		122 143 167
0.13 0.16 0.18
Water lbs
psi 		155 187 217
0.17 0.21 0.24
2 Gas lbs
psi 		216 258 306
0.24 0.28 0.34
Water lbs
psi 		282 346 406
0.31 0.38 0.45
3 Gas lbs
psi 		307 370 442
0.34 0.41 0.49
Water lbs
psi 		406 502 592
0.45 0.55 0.65
6 inch 1 Gas lbs
psi 		167 207 247
0.18 0.23 0.27
Water lbs
psi 		247 307 367
0.27 0.34 0.40
2 Gas lbs
psi 		306 386 466
0.34 0.43 0.51
Water lbs
psi 		466 586 706
0.51 0.65 0.78
3 Gas lbs
psi 		442 563 682
0.49 0.62 0.75
Water lbs
psi 		682 862 1042
0.75 0.95 1.15

The bearing stresses indicated above reflect utilization of an adjustable support bridge assembly consisting of 2 each Cross Brace Bridges, 2 each Channel Legs and 2 each Cross Bars.

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(fig. 4) Typical Roof Loads Due to Gravity Bearing Stresses

(Maximum Pipe Hanger Assemblies) 4 Base System

17" Circular Base Area: 908 sq.in.
17" Circular Base Weight: 20.0 lbs.
Frame Weight: 29.0 lbs.
Hanger Weight: 08.0 lbs.
Assembly Weight: 57.0 lbs. 1 pipe
86.0 lbs. 2 pipes
112.0 lbs. 3 pipes



Pipe Diameter Quantity Pipe Contents Pipe Support Spacing
6 feet 8 feet 10 feet
4 inch



 1 Gas lbs
psi 		122 143 167
0.13 0.16 0.18
Water lbs
psi 		155 187 217
0.17 0.21 0.24
2

Gas lbs
psi 		216 258 306
0.24 0.28 0.34
Water lbs
psi 		282 346 406
0.31 0.38 0.45
3

Gas lbs
psi 		307 370 442
0.34 0.41 0.49
Water lbs
psi 		406 502 592
0.45 0.55 0.65
6 inch 1 Gas lbs
psi 		167 207 247
0.18 0.23 0.27
Water lbs
psi 		247 307 367
0.27 0.34 0.40
2 Gas lbs
psi 		306 386 466
0.34 0.43 0.51
Water lbs
psi 		466 586 706
0.51 0.65 0.78
3 Gas lbs
psi 		442 562 682
0.49 0.62 0.75
Water lbs
psi 		682 862 1042
0.75 0.95 1.15

8 inch

 1 Gas lbs
psi 		227 287 347
0.25 0.32 0.38
Water lbs
psi 		357 457 557
0.39 0.50 0.61
2 Gas lbs
psi 		426 546 666
0.47 0.60 0.73
Water lbs
psi 		686 886 1086
0.76 0.98 1.20

10 inch


 1 Gas lbs
psi 		297 377 467
0.33 0.42 0.51
Water lbs
psi 		507 657 807
0.56 0.72 0.89
2 Gas lbs
psi 		566 726 906
0.62 0.80 1.00
Water lbs
psi 		986 1286 1586
1.09 1.42 1.75
12 inch
 1 Gas lbs
psi 		357 457 557
0.39 0.509 0.61
Water lbs
psi 		647 847 1047
0.71 0.93 1.15

The bearing stresses indicated above reflect utilization of an adjustable support bridge consistingOf 2 each Cross Brace Bridges, 2 each channel legs and 2 each Adjustable Cross Bars.

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(fig. 5) Product Information - 17" Circular Bases


Standard Base Size(inches) Weight(lbs.) Area(sq. in.)
  17" diameter 7 lbs. 227
Base Area per Support Assembly Model
SS1000 Pipe Section
1 base    7 lbs. 227
Base Area per Adjustable Support Bridge Model
SS4000 Pipe Section
4 bases   28 lbs. 908
Base Area per Adjustable Support Bridge Model
SS6000 Pipe Section
6 bases   42 lbs. 1362
Base Area per Adjustable Support Bridge Model
SS8000 Pipe Section
8 bases   56 lbs. 1816