Pump 2

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This model is only available in SysCAD 9.2 Build 133 and later.

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General Description

The Pump 2 model is mainly used in dynamic projects with Transfer mode. It allows users to set the pump speed or the pressure boost. The pump will NOT control the flow, but the user can use the pressure boost results to set the flow through the piping system.

The Pump has two main operating modes:

1. Simple - the user may NOT control the Pump speed, it acts as fixed pressure boost unit only.
2. Controlled - The user may control the Pump speed and the pressure boost from the Pump will vary accordingly.

The user may select a number of methods within these two modes for calculating the pressure boost:

1. Simple:
   • Fixed Boost - the pressure boost from the Pump is a fixed value, irrespective of flow;
   • Fixed Exit Pressure - the exit pressure from the Pump is a fixed value, irrespective of flow;
   • Fixed Atmospheric Pressure - the exit pressure from the Pump = Atmospheric pressure, irrespective of flow; and
   • Boost proportional to mass flow through the Pump - a simple linear function relating pressure boost to mass flow will be used. This method does not allow the user to set the Pump speed.
2. Controlled:
   • Boost proportional to Pump speed - a simple linear function relating pressure boost to Pump speed will be used;
   • Head proportional to Pump speed - a simple linear function relating Pump head to speed will be used; and
   • Pump Curves - The user may emulate pump curves where head is a function of flow.

Diagram

The diagram shows the default drawing of the Pump, with the required connecting streams. The unit will not operate unless all of the above streams are connected.

The physical location of the connections is not important, the user may connect the streams to any position on the drawing.

Inputs and Outputs

Label	Required Optional	Input Output	Number of Connections		Description
			Min	Max.
Input	Required	In	1	1	Input stream to pump.
Output	Required	Out	1	1	Output stream from pump.

Data Sections

The default access window consists of the following sections:

1. Pump2 tab - Allows the user to set the Pump Speed (if the appropriate operating mode has been chosen) and displays the calculated results.
2. Settings Tab - Allows the user to specify the Pump method and enter the required data.
3. Info tab - contains general settings for the unit and allows the user to include documentation about the unit and create Hyperlinks to external documents.
4. Links tab, contains a summary table for all the input and output streams.
5. Audit tab - contains summary information required for Mass and Energy balance. See Model Examples for enthalpy calculation Examples.

Class: Pump2 The first tab page in the access window will have this name.

Tag / Symbol	Input / Calc	Description/Calculated Variables
Common First Data Section
Options
On	Tick Box	This allows the user to disable the Pump. If the Pump is Off then the pressure boost from the Pump = 0.
Control This is only visible if the method chosen allows the Pump to be controlled.
Speed.Rqd	Input	The required Pump speed. Any value between 0 and 100%.
Speed.Actual	Display	The actual Pump speed. This is normally equal to the required speed. However, if the user has specified a stroke time, then the actual speed will lag the required speed by the stroke time.
Run Pump	Button	Clicking on this button will start the Pump at the required speed.
Stop Pump	Button	Clicking on this button will stop the pump (set the required speed to 0%).
Running	Tick Box	If this is True then the Pump is running.
RunningMax	Tick Box	If this is True then the Pump is running at 100%.
Stopped	Tick Box	If this is True then the Pump is stoppped.
Position.Changing	Tick Box	If this is True then the Pump speed is changing.
Results
Ti	Calc	The inlet temperature to the Pump.
Pi	Calc	The inlet pressure to the Pump.
dP	Calc	The pressure change across the Pump.
Po	Calc	The outlet pressure from the Pump.
EquivHead	Calc	The calculated equivalent head from the pump.
Total
Pump.dP	Calc	The total pressure change across the Pump.
dP	Calc	The total pressure change across the overall unit.
PBoost	Calc	The total pressure boost from the Pump.
Stream In and Out Summary
dP	Calc	The total pressure change across the Pump.
Qm	Calc	The mass flow rate through the Pump.
Ti	Calc	The inlet temperature to the Pump.
To	Calc	The outlet temperature from the Pump.
Pi	Calc	The inlet pressure to the Pump.
Po	Calc	The outlet pressure from the Pump.
Qvi	Calc	The volume flow into the Pump.
Qvo	Calc	The volume flow out of the Pump.
Vfi	Calc	The Inlet vapour fraction.
Vfo	Calc	The outlet vapour fraction.

Settings

Tag / Symbol	Input / Calc	Description/Calculated Variables
Settings
On	Tick Box	This allows the user to disable the Pump. If the Pump is Off then the pressure boost from the Pump = 0.
EquipID	Input	This field is optional. The user may type in an unique ID for the Pump.
There are two different operating modes for the Pump: Simple Pumps - these are fixed speed pumps and the user has no control over the speed. Controlled Pumps - the Pump speed may be changed by the user and the pressure boost changes based on the Pump speed.
OpType	Fixed Boost (Simple)	The user may specify a fixed pressure boost from the Pump.
	Fixed ExitP (Simple)	The user may specify a fixed exit pressure from the Pump.
	Fixed AtmosP (Simple)	The exit pressure from the Pump = atmospheric pressure.
	Boost Prop to mass Flow (Simple)	The pressure boost from the Pump will be proportional to the mass flow through the Pump. The user may NOT set the Pump speed if this operating mode is used, as the mass flow is the only variable used to calculate pressure boost.
	Fixed Head (Simple)	The user may specify a fixed head from the Pump.
	Boost prop to Speed (Controlled)	The pressure boost from the Pump will be proportional to the user defined speed.
	Head prop to Speed (Controlled)	The head from the Pump will be proportional to the user defined speed.
	Pump Curves (Controlled)	The user may emulate either a single or a set of pump curves, where head is a function of mass flow.
Fixed Boost (Simple) The following field is visible with this mode.
FixedBoost	Input	The required pressure boost when the Pump is running.
Fixed ExitP (Simple) The following field is visible with this mode.
FixedP	Input	The required outlet pressure from the Pump when it is running.
Boost prop to MassFlow (Simple) The following 3 fields are visible with this mode.
PressBoost.NoFlowPBoost	Input	The required pressure boost when there in no flow through the Pump.
PressBoost.NominalFlow	Input	The required pressure boost when there is nominal flow (specified below) through the Pump.
NominalFlow	Input	The nominal flow through the Pump. Used for the pressure boost calculations.
Fixed Head (Simple) The following field is visible with this mode.
FixedHead	Input	The required pressure Head when the Pump is running.
Boost Proportional to Speed (Controlled) The following 2 fields are visible with this mode.
PressBoost.Running	Input	The required pressure boost when the Pump is running at 100%.
PressBoost.Stopped	Input	The required pressure boost when the Pump is stopped.
Head Proportional to Speed (Controlled) The following 2 fields are visible with this mode.
Head.Running	Input	The required head when the Pump is running at 100%.
Head.Stopped	Input	The required head when the Pump is stopped.
Pump Curves (Controlled) The following fields are visible with this mode.
CurveType	Hmax, Qmax	In this case the user enters the maximum head and the maximum flow values at a specific pump speed.
	Polynomial	The user may enter a number of head values on the Head vs flow curve.
Hmax, Qmax The following 3 fields are visible with this mode.
RPM.Curve	Input	The speed of the Pump at the defined values.
Max.Head	Input	The maximum Head that the Pump can deliver.
Max.Qv	Input	The maximum volumetric flow that the Pump can deliver.
Polynomial The following 5 fields are visible with this mode.
RPM.Curve	Input	The speed of the Pump at the defined values.
Ho	Input	The Head at zero flow.
H1	Input	The head at point 1.
H2	Input	The head at point 2.
H3	Input	The head at point 3.
With RPM The following fields are visible if this tick box is enabled.
RPM.Running	Input	The speed of the Pump in RPM for the values defined by the user (at 100%).
RPM.Stopped	Input	The speed of the Pump in RPM when the pump is at 0%.
Stroke Times The following fields are visible if a Controlled mode is chosen.
StrokeTimeMode	None	The actual Pump Speed will change to the required speed with no delay time.
	Single Stroke Time	There will be a fixed delay between setting the required Pump speed and when the Pump reaches the required speed.
	Open/Close Stroke Time	The delay between setting the required Pump speed and when the Pump reaches the required speed will be different for starting and stopping settings.
StrokeTime	Input	The required delay between setting the required Pump speed and when the Pump reaches the required speed. Visible if Single Stroke Time is selected.
OpenStrokeTime	Input	The required delay between setting the required Pump speed and when the Pump reaches the required speed, if the Pump is starting. Visible if Open/Close Stroke Time is selected.
CloseStrokeTime	Input	The required delay between setting the required Pump speed and when the Pump reaches the required speed, if the Pump is stopping. Visible if Open/Close Stroke Time is selected.

Adding this Model to a Project

Insert into Configuration file

Sort either by DLL or Group.

	DLL:	Basic2.dll	→	Units/Links	→	Process: Piping: Pump(2)
or	Group:	Mass Transfer	→	Units/Links	→	Process: Piping: Pump(2)

See Project Configuration for more information on adding models to the configuration file.

Insert into Project

Insert Unit

→

Process

→

Piping

→

Pump(2)

See Insert Unit for general information on inserting units.