1.3. Example Piping Model Input

The following example input shows how to model this piping system:

!
! Sample piping data input
!
/FILNAM,EXAMPLE
/TITLE, EXAMPLE PIPING INPUT
/UNITS,BIN         ! A reminder that consistent units are U. S. Customary inches
!
/PREP7  
! Define material properties for pipe elements
MP,EX,1,30e6
MP,PRXY,1,0.3
MP,ALPX,1,8e-6  
MP,DENS,1,.283  
PUNIT,1            ! Units are read as ft+in+fraction and converted to
                   ! decimal inches
PSPEC,1,8,STD      ! 8" standard pipe
POPT,B31.1         ! Piping analysis standard: ANSI B31.1
PTEMP,200          ! Temperature = 200°
PPRES,1000         ! Internal pressure = 1000 psi
PDRAG,,,-.2        ! Drag = 0.2 psi in -Z direction at any height (Y)
BRANCH,1,0+12,0+12 ! Start first pipe run at (12",12",0")
RUN,,7+4           ! Run 7'-4" in +Y direction
RUN,9+5+1/2        ! Run 9'-5 1/2" in +X direction
RUN,,,-8+4         ! Run 8'-4" in -Z direction
RUN,,8+4           ! Run 8'-4" in +Y direction
/PNUM,NODE,1
/VIEW,1,1,2,3   
EPLOT              ! Identify node number at which 2nd run starts
BRANCH,4           ! Start second pipe run at node 4
RUN,6+2+1/2        ! Run 6'-2 1/2" in +X direction
TEE,4,WT           ! Insert a tee at node 4
/PNUM,DEFA
/PNUM,ELEM,1
EPLOT              ! Identify element numbers for bend and miter inserts
BEND,1,2,SR        ! Insert a "short-radius" bend between elements 1 and 2
MITER,2,3,LR,2     ! Insert a two-piece miter between elements 2 and 3
/PNUM,DEFA
/PNUM,NODE,1
! Zoom in on miter bend to identify nodes for spring hangers
/ZOOM,  1,  242.93    ,  206.62    , -39.059    ,  26.866    
PSPRNG,14,TRAN,1e4,,0+12     ! Insert Y-direction spring at node 14
PSPRNG,16,TRAN,1e4,,0+12     ! Insert Y-direction spring at node 16
! List and display interpreted input data
/AUTO
/PNUM,DEFA  
EPLOT
NLIST
ELIST
SFELIST
BFELIST
!

Although two hangers are provided, more restraints are needed before proceeding to the solution.