AVEVA™ Unified Engineering

Symbol Keys

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Symbol Keys

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Last UpdatedAug 19, 2025
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Note: How to define symbol keys is described in Symbol Keys.

The following list of the symbol key (that is, the SKEY text attribute) and the plotted symbol used to identify each type of component on isometric drawings. There is a section for each generic type. The sections are in alphabetic order of generic type:

BEND (refer to ELBOw)	Refer to ELBO or BEND Symbol Keys.
CAP	Refer to CAP Symbol Keys.
CLOSure	Refer to CLOS Symbol Keys.
COUPling	Refer to COUP Symbol Keys.
CROSs	Refer to CROS Symbol Keys.
ELBOw	Refer to ELBO or BEND Symbol Keys.
FBLInd (Blind Flange)	Refer to FBLI Symbol Keys.
FILTer	Refer to FILT Symbol Keys.
FLANge	Refer to FLAN Symbol Keys.
FTUBe (Fixed-length Tube)	Refer to FTUB Symbol Keys.
INSTrument	Refer to INST Symbol Keys.
LJSEnd (Lap Joint, Stub End)	Refer to LJSE Symbol Keys.
OLET (refer to TEE)	Refer to TEE or OLET Symbol Keys.
PCOMponent (Pipe Component)	Refer to PCOM Symbol Keys
REDUcer	Refer to REDU Symbol Keys.
SHU	Refer to SHU Symbol Keys.
TEE	Refer to TEE or OLET Symbol Keys.
TRAP	Refer to TRAP Symbol Keys.
UNIOn	Refer to UNIO Symbol Keys.
UNIVersal	Refer to UNIVERSAL Symbol Key.
VALVe	Refer to VALV Symbol Keys.
VENT	Refer to VENT Symbol Keys.
VFWAy (Four-way Valve)	Refer to VFWA Symbol Keys.
VTWAy (Three-way valve)	Refer to VTWA Symbol Keys.
WELD	Refer to WELD Symbol Keys.
FLOR (Pipe through floor)	Refer to Floor Penetration ATTA Symbol.

Symbol Key Reference Index is an alphabetical list of symbol keys cross-referenced to the generic types of the components to which they refer. The following information is given for each SKEY:

Component description	The actual component description
SKEY	A four-letter identifier
Plotted symbol	The symbol plotted on isometrics, plus dimensions (in mm)
P-points	The position and direction of the P-points are defined with respect to the plotted symbol. P-points needed to specify components fully are shown against the symbols. P-points which are optional are not shown, but their effects are explained in the notes when appropriate.
Notes	The numbers in the right-hand column, refer to the notes at the end of each section.

P-points

When defining piping components in Paragon the user must remember the following rules so that Isodraft can produce isometrics correctly:

P0 is automatically set and defines the origin of the component.
For two-way components, the arrive and leave p-points must be numbered P1 and P2 (not necessarily in that order). For two-way valves, the spindle direction must be indicated by P3.
For three-way components, the offline leg must be indicated by P3. The spindle direction for three-way valves must be specified by using a p-point greater than P3, which must have its bore unset.
For four-way components, the two straight-through flows must have p-points P1/P2 and P3/P4. The spindle direction for four-way valves must be specified by using a p-point greater than P4, which must have its bore unset.
For eccentric reducers without a connection point, the flat side must be indicated by P3. Eccentric reducers with a connection point must use P3, with a valid bore set, to indicate the connection point and must use P9, with bore unset, for orientation of the flat side.
For U-bends (defined as bends of more than 135 degrees), the p-points must be set as shown for each symbol.

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Symbol Keys

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Symbol Keys

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