Aspen HYSYS Pipe Models

7/26/2019 Aspen HYSYS Pipe Models

http://slidepdf.com/reader/full/aspen-hysys-pipe-models 1/23

© 2010 Aspen Technology, Inc. All rights reserved

Wim Van Wassenhove, Aspentech

Aspen HYSYS pipemodelling options



© 2010 Aspen Technology, Inc. All rights reserved | 2

Summary of available Pipe options andlicenses

Pipe segment– Standard feature in HYSYS– Optional add-on license to use OLGA 2-phase, or 3-phase correlations in the

Pipe unit

Compressible Gas Pipe

Pipe included in Valve (shortcut option for Dynamics)– Requires HYSYS Dynamics license

PIPESYS– Requires separate PIPESYS license

Links to Pipesim and Prosper/Gap– Requires HYSYS Upstream license

Aspen Hydraulics– Requires HYSYS Upstream and/or HYSYS Upstream Dynamics license

Link to OLGA– Requires HYSYS Upstream Dynamics license




Capabilities

Three main capability differentiators– Steady State vs. Dynamic modelling (SS / DYN)– Single line piping vs. Network modelling (SL or NET)– Single phase vs. multiphase modelling (SP or MP)

Assess your needs in terms of these capabilities– See table on next slide




Capability overview

Operation SS/SL/SP SS/SL/MP SS/NET/SP SS/NET/MP DYN/SL/SP DYN/S

Pipe segment X X X XCompressible Gas Pipe (*)X X X

Pipe included in Valve X XPipesys X XLink to Pipesim, Prosper/GapX X X X

Aspen Hydraulics X X X X X X XLink to OLGA X X X X X(*) Only gas phase calculations




HYSYS Pipe Segment

Part of standard HYSYS Steady State & Dynamics formodelling process piping and transport pipelinesNeeds feed and product streams, plus an Energy streamRepresents “multi - segment” single lineSegments can be pipes (different lengths, elevations,diameters), or fittings

1 2 3

4

5

6 7 89




HYSYS Pipe Segment

Limited network capabilitiesFor a single pipe you can specify 2 out of P in , P out & Flow

Alternatively, give all 3 (P in , P out & Flow) and it will calculateLength (for single segment only)For a single branched system of 3 pipes could specify, say, P1 &the 2 flowsCalculates P2Set mixer to equalize pressures, therefore P3 = P2

Calculates P4 and then P5P1

flow

flow

P2

P3P4

P5


http://slidepdf.com/reader/full/aspen-hysys-pipe-models 7/23© 2010 Aspen Technology, Inc. All rights reserved | 7

HYSYS Pipe Segment

Limited network capabilities

A typical gathering network will have well flows that dependon the back pressure of the network and a dischargepressure.

Limited network models can be done with Adjust blocks tobalance pressures (use Simultaneous Adjusts)

A network that gathers more than five wells is usually slowto solve. Could do more wells with some flows fixed



HYSYS Pipe Segment

Can model single phase and multiphase– Wide choice of multi phase correlations (see documentation

for details)Can model heat loss in detail– Can estimate heat transfer coefficient with Fluid + metal + 1

layer of insulation– Ambient medium can be Air,

Ground or Water– Alternatively enter a coefficient

for pipe, or for each segment– Or, specify heat loss



HYSYS Pipe Segment

Runs in dynamics, but doesnot consider phase slipOption to use OLGA 2-phaseor 3-phase correlations inPIPE

The pipe modelcan predicttypical slug lengthand frequency



Compressible Gas pipe

Part of standard HYSYS Steady State & DynamicsRepresents single line piping, no fittingsCan only model single phase vapour

Can model the momentum balance

– Suitable for pressure surge calculationsSimple heat loss model

There is no reason to use this in Steady State– The pipe segment will do a better job– Only use in steady state as a start for dynamic model

Only do this if in dynamics the momentum balance is required



Pipe included in valve

Only works in dynamics

Used to add piping pressure loss with minimal effort

No multiphase correlations

No elevation profile possible



PIPESYS

Third party product fromNeotech (SPT Group)

Represents single line pipingand includes fittings

– No advantage over pipesegment for in-plant piping(e.g. less fittings)

– Alternative to PIPE formodelling transmissionpipelines

Not in main unit operationpalette

Use Flowsheet > AddOperation… then selectExtensions and PIPESYS



PIPESYS

More flexibility in the definition of the piping elevationprofile compared to Pipe segment

Can specify:– Horizontal distance

along pipe fromOrigin

– Run for each pipe– Length of each pipe

And– Rise (-ve = fall)– Elevation relative to

Origin– Angle of pipe

In PIPESYS, com-pressors, pumps,heaters, coolers can also be included in the pipe run.



PIPESYS

Can model single phase and multiphase– Wide choice of multi phase correlations– Can specify different correlations for horizontal, vertical and

inclined flow (currently not in Pipe Segment, will be in V7.3)

Can model heat loss in detail

– Fluid + metal + multiple layers of insulationSlug size estimation for pigging operationsPipeline cool down calculation for shut in pipe

Can also use OLGAS correlations in PIPESYSSame network limitations as standard HYSYS PIPE unit

examples




Links to Pipesim and Prosper/Gap

Part of the HYSYS Upstream Option

Useful if you already use one of these tools

Only the link is provided!

Tools provide capability to model single and multi phaseflow networks




Aspen Hydraulics

Requires an additional license– HYSYS Upstream in steady state– HYSYS Upstream Dynamics

Aimed at modelling pipelines and pipeline networks

– Limited choice of fittings (valve, swage)– Full range of fittings available in V7.3

Can model heat loss in detail– Fluid + metal + multiple layers of insulation

2 and 3 phase transient analysis

Pipeline cool down calculation for shut in pipe




Aspen Hydraulics Steady State

Topology– Straight Run– Convergent Branched– Looped/Divergent

Unit Operations– Pipe Segment (with/without Heat Transfer)– Valve– Mixer/Tee (Calculates Flow Direction and Pressure Drop)– Swage– Full range of fittings in V7.3

Composition Tracking– Fully Compositional Model using an Equation Of State– Black Oil




Aspen Hydraulics Transient

Topology– Straight Run– Convergent Branched– Looped/Divergent

Solver Technology– ProFES Two Phase Transient– ProFES Three Phase Transient– Two Phase Pigging Model– Slug Prediction

Terrain InducedFlow Induced

Liquid Holdup Profile During Pigging




Aspen Hydraulics

Use Flowsheet > Upstream Operations …. To display theUpstream palette

Select the Aspen Hydraulics icon




Aspen Hydraulics

This creates a sub-flowsheet for theAspen Hydraulicscalculations

Along with a palette ofunit ops allowed inAspen Hydraulics

A H d li




Aspen HydraulicsUnit Operations

Pipe (Single segment)Complex Pipe (Multi-segment)

Swage

Valve

Tee-junction (Mixer)

Tee-junction (Splitter)

Orifice

Bend




Aspen Hydraulics

P specified

P calculated

Typically use valveswith unspecifiedPressure drop to givecorrect degrees of

freedom

Aspen HYSYS Pipe Models

Documents

Transcript of Aspen HYSYS Pipe Models