Fittings & Losses Library

The Edit Fittings & Losses panel can be accessed from the Library Menu and allows the user to review the Fittings & Losses data provided by default in xStream, and to add, edit or delete user defined Fitting & Losses in the AFT Default Internal Library.

Fittings & Losses can either be added by using the entry form in the window, or by importing a text file as described below. To enter a new Fitting/Loss item in the Edit Fittings & Losses panel click Create New Loss Item. Define the applicable category, type, geometry and loss model information then click Accept. The user-defined item will appear in the Fittings & Losses on the left under the relevant category/type with the source shown in parentheses as "U".

Custom fittings & losses are saved to the local user library. From there the user can move them to other libraries (see Library Manager).

Import From File

Fittings & Losses can be imported from a *.CSV type file, which can be created from any spreadsheet-type software, such as Excel.

The entries in the file should be in the order as shown in Figure 1, but with no headers in the workbook. If a header row or a blank row is used, xStream will present a warning, but give the user the option to still import the valid rows.

Figure 1: Example of import file setup for a custom elbow/bend. Headers should not be present in the file to import.

Valid options for each of the columns are listed below, with detailed options given in Table 1.

  • Category - Must match one of the values from Table 1. "Other" may be used if none of the specific fitting/loss categories fit.

  • Type - This field is required, any name/value may be entered. Types already existing in the library are shown in Table 1, and may be used if desired.

  • Sub Type - This field is optional. A sub-type may be chosen from Table 1, or any other name/value may be entered.

  • Geometry - This field is optional. A geometry type from Table 1 must be used if a geometry is entered. If the Geometry field is left blank, the Geometry Value will be ignored.

  • Geometry Value - This field is only required if a Geometry type has been entered. Any positive numerical value may be entered.

  • Loss Model - This field is required. The Loss Model must be either "K (constant)" or "K / fT (Crane)".

  • Loss Value - This field is required. Any positive numerical value may be entered for the loss value.

  • Reference/Notes - This field is optional. Any information may be entered here as needed.

Table 1: Valid Entries for each field. The Geometry Value and Loss Value fields will accept any numerical entry. The Reference/Notes field will accept any entry.

Category Type Sub Type Geometry Loss Model
Elbow/Bend
Standard Threaded
Mitre

Smooth Flanged

 

 

 

 

 

 

 

 

 

 

 

3-K (Darby)

 

 

General
General

r/D=1

r/D=1.5

r/D=2

r/D=3

r/D=4

r/D=6

r/D=8

r/D=10

r/D=12

r/D=14

r/D=16

r/D=20

90 deg

45 deg

180 deg

Angle (degrees)

Pipe Size (nominal)

None

K (constant)

k / fT (Crane)

Valve

Angle

 

 

 

Ball

Butterfly

 

 

 

 

 

 

 

 

 

 

Cylindrical

 

Gate

 

 

 

 

 

 

 

 

Globe

 

 

 

 

 

Plug

Poppet

 

 

Three-way

 

3-K (Darby)

 

 

 

 

 

Type 1

Type 2

Direct flow

General

None

Plane disk - AR=0.92

Plane disk

t/D=0.1

t/D=0.15

t/D=0.2

t/D=0.25

t/D=0.3

t/D=0.35

Type A

Type B

Type C

General

Rect. Tube

Wedge/Plug

Wedge

Disk w/o recess

Disk with recess

Disk

Wedge - Full Open 10 deg.

Wedge - Full Open 20 deg.

Sluice

Disk with recess

90 degree wall

45 degree wall

Standard 45 deg. wall

Standard 90 deg. wall

Standard

Y Type

Straight-way

W/D=.035

W/D=.07

No Seat Width

Through flow

Branch flow

Angle

Globe

Plug

Gate

Ball

Diaphragm

Angle (degrees)

Open Percentage

L/D

Pipe Size (nominal)

None

K (constant)

k / fT (Crane)

Check Valve

Swing

 

Lift

 

Tilting disc

Stop-check

 

 

3-K (Darby)

 

90 deg. seat

45 deg. seat

90 deg. wall

45 deg. wall

General

Globe 90 deg.

Globe 45 deg.

Globe thru flow

Swing Check

Lift Check

Angle (degrees)

None

K (constant)

k / fT (Crane)

Orifice
Sharp
Long
None
None

Area Ratio

None

K (constant)

k / fT (Crane)

Entrance/Exit

Entrance

 

 

Exit

Sharp

Reentrant

Rounded Flush

None

R/D

None

 
Other

Diff Flowmtr

 

 

 

 

Honeycomb cell

 

 

 

 

 

Screen

 

 

 

Tee

 

Orifice Plate

Nozzle

Venturi 7 deg.

Venturi 3 deg.

Dall Tube

L/D=2

L/D=4

L/D=6

L/D=8

L/D=10

L/D=12

Perforated Plate

Circular wire

Silk thread

Round wire or netting

Through flow (dead branch)

Branch flow (dead run)

Area Ratio

None

K (constant)

k / fT (Crane)

Flange Steel

150 lb.

300 lb.

None N/A

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