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Pipe Sizing Overview

Sunday, July 1st, 2012

This page provides an overview of how pipe sizing works in Design Master Plumbing 4.0. The customization is setup so that you can size pipes using any sizing method.

Creating the pipe sizes, flow categories, and sizing tables can be complicated and will take some time. Once you have configured those to match your companies standards, you will be able to easily size pipes in your projects.

Creating Sizing Tables

There are three customization commands that are used to define the information needed to size pipes.

The DM Plumbing->Customization->Pipe Size command defines the pipe sizes that are available to be used for each pipe type.

The DM Plumbing->Customization->Pipe Flow Categories command defines the types of flow that are available for each pipe type. Flows that have diversity factors can be created using this command.

The DM Plumbing->Customization->Pipe Sizing Tables command defines the tables that are used to size the pipes. The sizing tables set a maximum flow value for each pipe size. Horizontal and vertical pipes can be sized to different values.

Pipe Sizes Dialog Box

Each pipe type is listed in the grid. All of the available pipe sizes are listed below the pipe type. Each pipe type has a separate set of sizes associated with it.

Label: The label that is displayed on the drawing for the pipe size. You can enter any text here that you want. It will be displayed exactly as entered.

Interior Diameter: The interior diameter of the pipe size. This value is not currently used in the software. Future sizing and velocity calculations will use this value.

Exterior Diameter: The exterior diameter of the pipe size, used when drawing the pipe in 3D.

Pipe Flow Categories Dialog Box

Each pipe type is listed in the grid. All of the available pipe flow categories are listed below the pipe type. Each pipe type has a separate set of flow categories associated with it. The order of the pipe flow categories is important.

The first flow category is the one used to size the pipe.  All the other flow categories are converted to the first category before it is sized.

When pipes of different types are connected, the flow is transferred between the different pipe types.  The flow categories are matched up in the order they are listed in this dialog box.

Category Name: The name of the category that is displayed in the pipe query dialog box. This is a display value for the user only. It is not printed on the drawing.

Label Prefix: A prefix that is added to the flow value when it is printed on the drawing.

Label Suffix: A prefix that is added to the flow value when it is printed on the drawing. Make sure to include a space at the beginning of the suffix if you want a space between the value and the label.

Conversion: The type of conversion used to convert the flow category to the first flow category. The first flow category cannot have the conversion set.

Multiplier: The value of the flow category is multiplied by this value to convert it to the first flow category.

Lookup Table: The value of the flow category is converted based upon a lookup table. The Flow Lookup dialog box will be displayed.

The flow is assumed to be a count of the number of fixtures of the type. For example, the displayed lookup table is for water closets with flushometer valves (UPC Table 6-7).

Fixtures: The number of fixtures.

Flow: The corresponding value to use when converting to the first flow category. Enter the total flow value here. In this example, the additional flow for the second fixture is 30 FU, but the total for the first two is 70 FU. The total of 70 FU is entered.

Minimum Pipe Size: The minimum pipe size that is used when the pipe contains the specified number of fixtures. The size can be larger than this if the flow from other fixtures requires it, but it will never be smaller.

Additional Multiplier: The final row is treated differently from the other rows. This is the additional flow that will be added for each additional fixture beyond the last value listed. Here, the flow value is the additional flow, not the total. In this example, each additional fixture adds 10 FU to the total.

Pipe Sizing Tables Dialog Box

The pipe sizing tables convert from the total flow value in a pipe to a pipe size. It is the link between the pipe sizes and the pipe flow categories.

Multiple sizing tables for each pipe type can be created in the grid on the left.

Active: Whether or not the sizing table is displayed when querying a pipe. You will want to define lots of sizing tables in your standards database, however they will not all apply to your current project. Limiting only a few sizing tables to be active will simply your choices when setting the sizing table for a pipe.

Name: The name of the sizing table that is displayed to the user. It is also used as a default for the sizing table schedule printed on the drawing, but can be customized if necessary.

The lookup table that converts a flow value to a pipe size is created in the grid on the right.

Vertical Flow Same as Horizontal Flow: Whether or not vertical pipes are sized the same as horizontal pipes. Check this box to size all pipes the same. Uncheck this box to size vertical pipes differently from horizontal pipes.

Size: Each size defined in the Pipe Sizes dialog box is listed here. These cannot be changed in this dialog box.

Flow, Horizontal: The maximum flow allowed in horizontal pipes of this size.

Flow, Vertical: The maximum flow allowed in vertical pipes of this size. This column will be disabled if the Vertical Flow Same as Horizontal Flow box is checked.

Enable: Whether or not this pipe size is used when sizing pipes automatically. If it is unchecked, this size will not be chosen when sizing pipes, and this size will not be displayed in the pipe sizing table printed on the drawing.

Sizing Pipes

To size the pipes, use the DM Plumbing->Pipes->Pipe Calculations command. Select a pipe in the system you want to size. Each flow category in the pipes will be totaled separately. The flow categories will all be converted to the first flow category. Then the pipe size is chosen based upon this total flow value using the pipe sizing table.

There are two fields in pipes related to sizing pipes. You can modify these values when inserting or modifying a pipe.

Size: Size is pulldown menu of pipe sizes defined in the Pipe Size command. The default value is Sized Automatically. When this is selected, the pipe size will be chosen based upon the flow values and sizing table.

A specific pipe size can be set by selecting a pipe size from the pulldown. The pipe size will not be changed during the calculations.

Custom pipe sizes cannot be entered. You must choose a size from the pipe size list. If you need a different size, add it to the pipe size list, then select it.

Sizing Table: The table used to size the pipe is selected here. All of the active sizing tables will be listed.

You can also choose Same as Previous. If this is selected, the pipe will be sized based upon the previous pipe.

Set the sizing table for the first pipe in the system, then set the rest to Same as Previous.

If the sizing table changes at any point in the system, for example a high pressure and low pressure part of the system, change the Sizing Table setting in the pipe where the change happens. All the pipes before the changed pipe will be sized based upon the Sizing Table setting in the first pipe, and all the pipes after the changed pipe will be based upon the Sizing Table setting in the changed pipe.

Inserting Sizing Tables on the Drawing

The DM Plumbing->Pipes->Insert Pipe Sizing Table command can be used to insert sizing tables on the drawing to document how the pipes are sized.

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