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THRUST BLOCK SIZING | Unnamed: 1 | Unnamed: 2 | Unnamed: 3 | Unnamed: 4 | Unnamed: 5 | Unnamed: 6 | Unnamed: 7 | Unnamed: 8 | Unnamed: 9 | Unnamed: 10 | Unnamed: 11 | protection password:  suz | Unnamed: 13 | Unnamed: 14 | Unnamed: 15 | Unnamed: 16 | Unnamed: 17 | Unnamed: 18 | Unnamed: 19 | Unnamed: 20 | Unnamed: 21
Thrust control. Abrupt changes in pipeline grade, horizontal alignment, or reduction in pipe size normally require an anchor or thrust blocks to absorb any axial thrust of the pipeline. Thrust control may also be needed at the end of the pipeline and at in-line control valves. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sound bedrock |  |  |  |  | pipe sizes
Thrust blocks and anchors must be large enough to withstand the forces tending to move the pipe, including those of momentum and pressure as well as forces due to expansion and contraction. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dense sand and gravel mixture (assumed 0=40°) |  |  |  |  | 0.5
The pipe manufacturer's recommendations for thrust control shall be followed. In absence of the pipe manufacturer's requirements, the following formula must be used in designing thrust blocks: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dense fine to coarse sand (assumed 0=35°) |  |  |  |  | 0.75
A=((98*H*(D^2))/B)*sin(a/2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Silt and clay mixture (assumed 0=25°) |  |  |  |  | 1
Where: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Soft clay and organic soils (assumed 0=10°) |  |  |  |  | 1.25
 | A = Area of thrust block required in square feet  H = Maximum working pressure in feet  D = Inside diameter of pipe in feet  B = Allowable passive pressure of soils in pounds per square feet  a = Deflective angle of pipe bend |  |  |  |  |  |  |  |  |  |  |  |  |  |  | dia. | normal | no hazard |  |  | 1.5
Area of thrust blocks for dead ends and tees shall be 0.7 times the area of block required for a 90-deflection angle of pipe bend. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 18 | 6 |  | normal | 2
If adequate soil tests are not available, the passive soil pressure may be estimated from Table 1. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.6 | 18 | 12 |  | no hazard | 2.5
Table 1. - Allowable soil bearing pressure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.6 | 24 | 12 |  |  | 3
 |  |  |  | Depth of cover to center of thrust block |  |  |  |  |  |  |  |  |  |  |  | 3.1 | 24 | 18 |  |  | 3.5
Natural soil material |  |  |  | 2 ft | 3 ft | 4 ft | 5 ft |  |  |  |  |  |  |  |  | 6 | 30 | 24 |  |  | 4
 |  |  |  | -------------lb/ft2---------- |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5
Sound bedrock |  |  |  | 8000 | 10000 | 10000 | 10000 |  | Project: | Living Seed 2 ([NAME]) |  |  |  |  |  |  |  |  |  |  | 6
Dense sand and gravel mixture (assumed 0=40°) |  |  |  | 1200 | 1800 | 2400 | 3000 |  | H = | 105 | psi |  |  |  |  | 18 | depth of cover in inches |  |  |  | 8
Dense fine to coarse sand (assumed 0=35°) |  |  |  | 800 | 1200 | 1650 | 2100 |  | Pipe Diameter = | 2 | in | normal |  |  |  | 1.5 | depth of cover in feet |  |  |  | 10
Silt and clay mixture (assumed 0=25°) |  |  |  | 500 | 700 | 950 | 1200 |  | Soil: | Silt and clay mixture (assumed 0=25°) |  |  |  |  |  |  |  |  |  |  | 12
Soft clay and organic soils (assumed 0=10°) |  |  |  | 200 | 300 | 400 | 500 |  | B = | 500 | lb/ft2
 |  |  |  |  |  |  |  |  | Depth of Cover = | 18 | in |  |  |  |  | depth of cover | sound bedrock | d=40° | d=35° | d=25° | d=10°
Thrust Block Sizing Table |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 8000 | 1200 | 800 | 500 | 200
 |  |  | T = 12" |  |  |  |  |  |  |  |  |  |  |  |  | 2.4 | 10000 | 1800 | 1200 | 700 | 300
Location |  | A (sf) | H=W (in) | W (in) | T (in) |  |  |  |  |  |  |  |  |  |  | 3.4 | 10000 | 2400 | 1650 | 950 | 400
90 degree Bend |  | 0.9337698598958952 | 11.59581216754605 | 12 | 11.20523831875074 |  |  |  |  |  |  |  |  |  |  | 4.4 | 10000 | 3000 | 2100 | 1200 | 500
45 degree Bend |  | 0.5053526066097193 | 8.53057884037183 | 12 | 6.064231279316632
Tee |  | 0.6536389019271266 | 9.70175251578323 | 12 | 7.843666823125519
[NAME]
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