ISODRAFT
User Guide
Symbol Keys
: Angled Fittings
Angled Fittings
It is possible to define two groups of types of angled fittings.
The first group of types of angled fitting may be defined as follows:
Component Type
SKEY
Angled Filter
FA**
Angled Instrument
IA**
Angled Trap
TA**
Angled Valve
AV**
Angled Valve
AX**
Angled Valve
AR**
Angled Instrument Valve
CA**
Angled Instrument Valve
SA**
Angled Instrument Valve
MA**
Angled Instrument Valve
HA**
Definition of these components is subject to the following constraints:
•
Both legs (In and Out) must be identical.
•
The legs must have a common pivot point and this pivot point must be at a closed end. (This excludes shapes similar to those currently used for the FA** range of SKEYs.)
•
The symbol shapes must be symmetrical about the X-axis.
For example:
The dotted legs are those which will be duplicated and mirrored automatically.
Unless the legs are symmetrical, it cannot be guaranteed that they will be duplicated in the correct plane when they are mirrored.
When defining an angled fitting, the start point for the defined shape will be the pipe connection point and the end definition point will be the closed (or pivot) point, thus:
A tee point must be positioned on the pivot point.
The ORIENTATION NONE option should be used when defining angled fittings.
The second group of angled fittings is the Y-types, so called because of the angle created between the main leg and the off legs.
Component Type
SKEY
Generic Y-type Cross with user-definable out- and off- legs
X@**
Generic Y-type Tee with user-definable out- and off- legs
Y@**
The Y-type Cross and Tee need to be set up in the catalogue before these symbols can be used. Use Paragon to define each symbol - requiring PTSEs (point sets), GMSEs (geometry sets), DTSEs (data sets) and SCOMs of generic type CROS and TEE. It is advised to use parameters and design parameters when setting up the data. Parameters are set on the SCOM and the design parameters are set on the component during design. For the PTSE it is advised to use PTAX or PTPOS for the in leg p-point and PTPOS for each out leg p-point. PTPOS must be used for the out legs as the PTAX element does not support the usage of design parameters.
By default the legs of the Y-type Cross and Tee are defined as variable width, rectangular, filled polygons overlapping at P0. In this way the pivot point will not be apparent.
Each leg corresponds to a symbol definition for X1**, X2**, X3**, X4** for the Y-type Cross and Y1**, Y2**, Y3** for the Y-type Tee. The correct symbol is automatically selected by ISODRAFT dependent upon the comparative bore sizes of the connections. The @ is replaced by a digit in the range 1-4 for the Cross and 1-3 for the Tee, with X1** / Y1** being allocated to the largest bore, and X4** / Y3** being allocated to the smallest bore. Each of the legs is redefinable so it is important to bear in mind the bore sizes when redefining the symbol of any leg. The end connections replacing the ** may be: FL (flanged), CP (compression), SC (screwed), BW (butt welded), SW (socket welded) or PL (plain).
Y-TYPE CROSS
Y-TYPE TEE
When the angles have been applied then the symbols appear as shown below.
Flanged connections on generic Y-type fittings are represented on the isometric on the tube only. This is due to the fact that the y-type fitting is user-definable and flanged representation on the component cannot be enforced.
1974 to current year.
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