Basic Concepts

Pipe Stress Interface XML Schema

XML Schema : Basic Concepts

The PSI parsing mechanism steps through a series of branches in the sequence of the stress pipe.

Note:

A stress pipe is a collection of branches which do not need to belong to the same real pipe.

The AVEVA E3D™ pipe structure is as follows:

A pipe is a collection of two ended segments called branches. In the example below there are two branches, the horizontal segment including the tee, bend and two flanges. The second branch is from the tee to the flange. A pipe may contain multiple branches.

Branches have a start and end point known as the head and tail. These define position, direction and many other attributes that define the branch.

The simplest form of a branch is one which runs directly from head to tail with no components other than the tube between them. Most branches do have components and these are contained in a list which exists below the branch, as shown below:

A branch can be summarised as a two ended container for components.The only important rule is that the components must be in sequence, in line and face in the correct direction. Individual branch components are defined in a piping catalogue and selected from a pipe specification. The list of components may be any of the following:


FLAN	Flange
ELBO	Elbow
TEE	Tee
REDU	Reducer
VALV	Valve
ATTA	Attachment Point
PCOM	Piping Component
FBLI	Blind Flange
BEND	Bend
OLET	Olet
COUP	Coupling
INST	Instrument
CAP	Cap
GASK	Gasket
FILT	Filter
WELD	Weld
CROS	Cross
UNIO	Union
VTWA	Three Way Valve
CLOS	Closure
TRAP	Trap
LJSE	Lap Joint Stub End
FTUB	Fixed Tube
VFWA	Four Way Valve
SHU	Standard Hook Up

Some of the listed types are obvious but others are less so, this not important for the xml description.

Components within a branch must have at least two connection points, called PPoints which define the component length and position. A tee and other multi-way components with other connection points which are connected to other branches.

The following is the pipe represented as a stress group showing the node numbers which appear in CAESAR.

What Goes in the .xml file

The body of the xml file is essentially a list. Every PPoint is listed, but only those with Node numbers are transferred to the CII file. The output contains other values but this list contains the essential attributes required to understand the concept.


Seq	NodeNo	Type	RefNo	Point	PPoint	Bore	Radius	Rigid	East	North	Up
1		BRAN	=676/3060	1	1	80mm	0.000	START	-2000mm	13800mm	0.000mm
2	10	FLAN	=676/3061	1	1	80mm	0.000		-2000mm	13800mm	0.000mm
3	20	FLAN	=676/3061	2	2	80mm	0.000	END	-2050mm	13800mm	0.000mm
4		TEE	=676/3062	1	1	80mm	0.000		-2913mm	13800mm	0.000mm
5		TEE	=676/3062	3	3	80mm	0.000		-2999mm	13800mm	86mm
6	30	TEE	=676/3062	0	0	80mm	0.000		-2999mm	13800mm	0.00mm
7		TEE	=676/3062	2	2	80mm	0.000		-3085mm	13800mm	0.00mm
8	40	FLAN	=676/3063	1	2	80mm	0.000	START	-3949mm	13800mm	0.0mm
9		FLAN	=676/3063	2	1	80mm	0.000		-3999mm	13800mm	0.0mm
10		GASK	=676/3064	1	1	80mm	0.000		-3999mm	13800mm	0.0mm
11		GASK	=676/3064	2	2	80mm	0.000		-4001mm	13800mm	0.0mm
12		FLAN	=676/3065	1	1	80mm	0.000		-4001mm	13800mm	0.0mm
13	50	FLAN	=676/3065	2	2	80mm	0.000	END	-4051mm	13800mm	0.0mm
14		BEND	=676/3066	1	1	80mm	210.00		-4790mm	13800mm	0.0mm
15	60	BEND	=676/3066	0	0	80mm	210.00		-5000mm	13800mm	0.0mm
16		BEND	=676/3066	2	2	80mm	210.00		-5000mm	13800mm	210mm
17	70	FLAN	=676/3067	1	2	80mm	0.000	START	-5000mm	13800mm	450mm
18		FLAN	=676/3067	2	1	80mm	0.000		-5000mm	13800mm	500mm
19	90	BRAN	=676/3060	2	2	80mm	0.000	END	-5000mm	13800mm	500mm
20	100	BRAN	=676/3068	1	1	80mm	0.000		-2999mm	13800mm	0.00mm
21	110	FLAN	=676/3069	1	2	80mm	0.000	START	-2999mm	13800mm	536mm
22		FLAN	=676/3069	2	1	80mm	0.000		-2999mm	13800mm	586mm
23	130	BRAN	=676/3068	2	2	80mm	0.000	END	-2999mm	13800mm	586mm

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