P&ID

A P&ID (piping and instrumentation diagram) shows the plant: tanks, pumps, valves, pipes and the instruments on them, as ISO 10628 and ISA 5.1 draw them. In the program it is a page of its own kind, and its devices are the devices of the schematic.

A P&ID page

Make one with New page… → Type: P&ID. It has the same frame and title block as a schematic. Give it the location of the plant (+FIELD): the devices on it then have the tags they have on the schematic.

On a P&ID page the Symbols tab opens its P&ID section, in the groups of ISO 10628-2:

• Valves: gate (open and normally closed), globe, ball, butterfly, plug, needle, diaphragm, knife gate, check, three-way, four-way, angle, float and safety valves, a valve with a handwheel, a rupture disc.
• Control valves: with a diaphragm (also failing open or closed), an electric, hydraulic or piston actuator, a solenoid; three-way control and solenoid valves; ball and butterfly valves with actuators; pressure, back pressure and temperature regulators.
• Pumps, compressors, fans: centrifugal, positive displacement, submersible, diaphragm, dosing and screw pumps, ejector, compressor, turbine, fan (radial, axial), motor.
• Vessels and tanks: vertical and horizontal vessels, vessel with a jacket, open tank, tanks with cone and floating roofs, sphere, column, silo, hopper, gas cylinder, sump.
• Heat transfer: shell and tube, plate and U-tube heat exchangers, air cooler, cooling tower, electric heater, heating coil, fired heater, boiler.
• Filters and separators: filter, strainer, bag, cartridge and sand filters, cyclone, centrifuge, oil/water separator, membrane unit, clarifier.
• Mixing and solids: agitator, static mixer, belt and screw conveyors, rotary valve.
• Instruments: the ISA bubbles (in the field, on the main or an auxiliary panel, behind the panel, function of the DCS or SCADA and of the PLC, at the operator or not, computer function) and the interlock diamond.
• Measuring elements: orifice plate, Venturi and Pitot tubes, flow meters (magnetic, turbine, vortex, Coriolis, ultrasonic, volume, variable area), level gauge, sight glass, thermowell, sample point, analyzer probe, weighing cell.
• Lines and fittings: reducer, flanges, end cap, spectacle blind, restriction orifice, expansion joint, steam trap, flame arrester, silencer, spray nozzle, funnel, quick coupling, drain, vent, hose, and the line to or from another page.

Pipes and signal lines

On a P&ID page the Wire tool (W) draws lines: from a nozzle, a junction or another line, with bends, to a nozzle or a line, as a wire is drawn. They are no circuits: they get no wire numbers and are not in the Connections table, the lengths or the reports.

The properties of a line:

• Kind: process line, main (thick, with an arrow of the flow), secondary (thin), heat traced (a dashed tracer beside it) or jacketed (an outline round it); a signal line, electric (dashed), pneumatic (double strokes), hydraulic, capillary or data link. New lines take the kind chosen last.
• A line has no colour or cross-section of a wire: double-click it for its own properties.
• Line number (101-W-DN65), DN, Medium and the Flow arrow (along the line as drawn, against it, none). The number is written over the longest piece of the line, once.

A valve, a filter or a flow meter put on a straight piece of a pipe goes into it: the pipe is cut there and goes on from each nozzle. Delete it, and the pipe grows back together.

Instruments

An ISA bubble shows its ISA letters (PT, LSH, FIC) over its Loop number (101): set both in its properties. Its device tag (-B3) is beside it; Show device tag leaves it out.

The same devices as on the schematic

A symbol on a P&ID is a picture of a device. With the tag of a device of the schematic it is that device: the pump -M1 on the P&ID and the motor -M1 on the schematic share their description, part and place. The picture is no function of its own: the device keeps one main function, and its part is counted once.

• Under the picture is where the device is on the schematic (=PS+CAB1/2.2). Go to cross-reference (F) goes there, and from the schematic back to the P&ID.
• PLC channel in the properties of a picture tells the channel its device is wired to: the pressure transmitter -B3 → -A1 AI0 · Pressure.
• A device only on the P&ID (a tank, a hand valve) is a device too, in the Devices table and the device list.

A line going on on another page ends at a Line to another page; it starts again at a Line from another page of the same name. Each shows the page of the other, and F goes there.

The example project (Help → Open example project) has a P&ID of its pump station.