Trunnions

Multi-Discipline Supports User Guide

Trunnions

A trunnion is designed to a standard. A standard trunnion can have associated ancillaries, which are themselves standards. For instance, a trunnion standard XTT06-Base ELL and Pipe Support Variable NPS 2-36, requires a reinforcing pad where it is welded to the pipe. This pad is added to the design as a standard general ancillary XAT05-Reinforcing Plate cut from pipe.

Special notes: regarding reinforcing plates for trunnions

1.

A plate is cut from an elbow of the same size and is itemised as extra material on the isometric drawing.

2.

To get the best graphical representation of the plate and trunnion in MODEL, set Holes On and Arctol = 1.

It is also possible to create just a trunnion branch (Create > Trunnion). This is a piece of tube (a new branch is created in the model), that can also have ancillaries associated with it (for example a u-bolt).

To create a standard trunnion, on the Supports tab, in the Create group, click Trunnions to display the Trunnions window.

Enter the name of the support to be created. The user can also use the auto-naming feature by clicking on the AutoName icon

Select the support type required.

At any time when the Trunnions window is displayed, the user can click View to see the engineering drawing corresponding to the selected support.

Click OK to display the Trunnion Creation window.

Refer to the MDS Trunnion Defaults window in the MDS Administrator Guide for further information.

In this example the user will create support type XTT04 using the name PS14721.

Select the component the trunnion is being added to using the icons at the top of the window:

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Tube (straight piece of pipe)

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Eccentric reducer

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Use the cursor to identify a respective branch member applicable to the icon chosen (in this case identify ELBO to create a base support).

At the prompt, identify the steelwork or panel the user wants to support from. The Select Trunnion Material window is displayed.

Select the piping specification of the trunnion material from a list of the available piping specifications in the current MDB. The default pipe specification of the parent pipe (the main branch) is highlighted by default.

If a trunnion is added to a reducer/elbow and no connection point is found, the current pipe specification is interrogated to find the appropriate reducer/elbow and the specification reference to the new reducer is reset.

If a trunnion is added to a tee, the tee changes to a cross and scans the current pipe specification for a suitable cross. This is required because a tee has one only connection reference.

If a trunnion is deleted, any element reselected is replaced with the original specification reference.

Click OK and the trunnion window shown previously, with Length and Trunnion Bore being active.

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