underground pipe modeling input into triflex ® or how do i know that my pipe is underground?...

Underground Pipe Modeling INPUT into TRIFLEX ® or

How do I know that my Pipe is Underground?

TRIFLEX® WINDOWSPipingSolutions, Inc. 23 June 2004

1

Begin to build your Piping Model within TRIFLEX ®.


2

Note how there are NO “Whiskers” or “Heat Exchanger” marks on the pipe to indicate that

it is Underground.


3

Go to Setup, Case Definition to see that you have forgotten to check the “Soil Interaction”

box.


4

Checking Soil Interaction will then show the “Whiskers” or “Heat Exchanger” marks on the

piping model. See Next slide.


5

Checking Soil Interaction will then show the “Whiskers” or “Heat Exchanger” marks on the

piping model


6

Note the “Whiskers” or “Heat Exchanger” marks on the piping model.

Therefore the pipe is Underground up to Node Point 50.

Checking the full Piping Model we see the pipe is underground until Node Point 50. And we see the smaller 10 inch pipe underground at

Node point 125.


7

But what about the Vertical Supports shown on the Underground Piping. How do you Model

that?


8

The Vertical Support is in the Center of Two elements. These two elements have the Soil Tabs turned OFF (or None). While the rest of the Underground Piping Model

has the Soil Tabs turned ON.


9

Note that it says NONE.

The Vertical Support is in the Center of Two elements. These two elements have the Soil Tabs turned OFF.

While the rest of the Underground Piping Model has the Soil Tabs turned ON (or selected a soil approach).


10

Note I have selected the ASME B31.1 approach.

For the differences in Soil Modeling approaches. Contact PipingSolutions, Inc. Ph: (713)-849-3366Fax: (713)-849-3554Web: http://www.pipingsolutions.com

The Vertical Support is in the Center of Two elements. These two elements have the Soil Tabs turned OFF.

While the rest of the Underground Piping Model has the Soil Tabs turned ON (or selected a soil approach).


11

Note I have selected the User Defined approach.

For the differences in Soil Modeling approaches. Contact PipingSolutions, Inc. Ph: (713)-849-3366Fax: (713)-849-3554Web: http://www.pipingsolutions.com

But what about this SOILS TAB. And how do I use it?


12

Start with the depth of the Pipe. Here 3 ft. of cover, or 54” from grade to the centerline of the 36” pipe.

Grade

Pick the Soils tab, then select the B31.1 approach.


13

Depth to centerline

Density of Soil

Horizontal stiffness factor. This is the compaction of the Soil.

Backfill with Dry Sand

Trench width is one pipe dia. plus 24”. Or 60”

Axial Friction Coeff.

The Load Coeff. Here is zero. Or N/A since the pipe is less than 3 pipe diameters below the soil. If the pipe was 3 pipe diameters or greater then a value for the load coeff. Would be put in

automatically by TRIFLEX.

But what actual values are used for soil?


14

The eight values shown are the values that TRIFLEX uses for the Soil.

underground pipe modeling input into triflex ® or how do i know that my pipe is underground?...

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