*Lines PIP

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*Lines PIP

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Purpose

To specify that two lines are connected in a pipe-in-pipe (or pipe-on-pipe) configuration.

Theory

Refer to Pipe-in-Pipe Configurations for further information on this feature.

Keyword Format

A block of lines defining connections between two lines. The block begins with a line defining the primary and secondary lines, the configuration type, and an optional offset term. This is optionally followed by one or more lines defining linear, non-linear or rigid connections between the lines at regular intervals in the axial direction. This line may be repeated as often as necessary to define all the required connections between the lines. The entire block of lines may be repeated as often as necessary to define all the required locations along lines in the model.

Line defining the primary and secondary lines, the configuration type, and an optional offset term:

PRIMARY=Primary Line Name, SECONDARY=Secondary Line Name, TYPE=Configuration [, OFFSET=Offset]

Optional lines defining linear, non-linear or rigid connections between the lines at regular intervals. Distances are measured from the start of the primary line. This line may be repeated as often as necessary to define all the required connections between the lines:

[STIFFNESS=Stiffness or CURVE=Curve Name or BULKHEAD, Spacing, Start Distance, End Distance]

The Primary Line Name and Secondary Line Name referenced must be defined under *LINES. Configuration may be PIP or POP. Offset defaults to zero if omitted. Any Curve Name referenced must be defined under *PIP STIFFNESS.

Pipe-In-Pipe Sections

Table Input

Input:

Description

Primary Line Name:

The name of the primary line.

Secondary Line  Name:

The name of the secondary line. 

Configuration Type:

The configuration type, whether Pipe-in-Pipe (the default) or Pipe-on-Pipe.

Connection Table:

The name of the relevant connection definition.  

Offset for Secondary Line:

The difference in length between (i) the distance of the first connection along the Primary Line and (ii) the distance of the first connection along the Secondary Line. This entry is optional and defaults to zero if omitted

Notes

(a)Refer to Line Mesh Generation for a detailed discussion of the automatic mesh creation facility.

(b)Any Primary Line Name or Secondary Line Name you reference must be defined in the Lines table.

(c)Any Connection Table you reference must be defined in the Lines - Pipe-in-Pipe Connections table.

(d)The Offset for Secondary Line input might be used in situations where the ends of the Primary Line and the Secondary Line are misaligned in the axial direction.  In this case, you may wish to specify an offset term in order to ensure that the actual connections are aligned in the axial direction.

Pipe-In-Pipe Connections

Table Input

Input:

Description

Table Name:

The name of the connection definition. This is referenced by the Lines - Pipe-in-Pipe Section table. See Note (b).

Type:

The connection type, whether Pipe-in-Pipe (the default) or Bulkhead

Spacing:

The spacing between successive connections. 

Start:

The distance along the line (measured from the start of the Primary line) to the first connection.  

End:

The distance along the line (measured from the start of the Primary line) to the last connection. 

Stiffness:

The linear stiffness of the connection between these nodes or the name of a non-linear force-deflection curve that defines this stiffness (defined via the Pipe-in-Pipe Stiffness table). This entry is not relevant to Bulkhead connections.

Notes

(a)Use as many rows as you need to completely define all the pipe-in-pipe connections within a particular set of connections. Simply leave Column 1 blank for the second and subsequent connections within that set. For subsequent sets, put the Table Name in Column 1 and specify the pipe-in-pipe connections in the same way.