Data description/conditions

Specification of polygon points of pipeline configuration through coordinate differences and height levels (Input Table)

Data description/conditions:

IDENT:

Identification name of polygon point (n)

Undefined / Required at start and end of a weak element (see also etyp below). Name must be unique.

ΔX-N:

X-coordinate difference between polygon point (n) and (n-1)

None / Required ¹

ΔY-N:

Y-coordinate difference between polygon point (n) and (n-1)

None / Required ¹

Z-N:

Z-coordinate of polygon point (n)

None / Required ¹

BENDRAD:

Radius of pipe bend at polygon point (n)

0. ¹

[Default: 0.]

(BENDRAD = 0. means a 'stiff' mitre bend (no bending stiffness reduction). At the last data line a BENDRAD value > 0. is ignored.)

ETYP:

Type of element/bend

Undefined / Prescribed names: Elastic / Weak / Odd Elements ¹

(Undefined: Normal bend (if BENDRAD > 0).
Prescribed names:
Elastic: Elastic bends to be specified in Geometric non-linear modules only.
Weak: Weak elements are elements / polygon lines without axial and flexural stiffness providing the possibility to specify branched connections. Points to be connected must have a unique IDENT.
Odd Elements: Odd Elements means that the number of elements generated in a bend is odd.)

BEND.EL:

Nominal bend element length in bend at polygon point (n)

> 0. / Undefined ¹  (for the recommended length see ²)

(The specified BEND ELEMENT LENGTH is the element length along the arc.)

PIPE.EL:

Nominal pipe element length on polygon line from point(n-1) to(n)

> 0. (for the recommended length see ²)

(Best practice element length is once or twice the pipe diameter.)

EXT:

Number of pipe elements with bend element length extending at both sides of the bend at polygon point (n)

> 0 / Undefined ¹

(In case available pipe length between bend tangent points is not sufficient for the bend extension(s) specified, the number of extension elements will be reduced automatically to match the available pipe length. Extension elements have straight pipe properties, unless the bend is specified to be elastic. In that case a curvature will be assigned to the extension elements decreasing linearly from 1/BENDRAD at the bend side to zero at the straight pipe side. Note: Coordinates remain unchanged!)

¹ see also DATA CONDITIONS at TABLE ERROR DESCRIPTION

² Recommended element length

maximum element length a = nmax* D
minimum length of pipeline at both sides A = mmin* D

(Example in graph: D = 500 mm, t = 10 mm, k = 10-2 N/mm3, E = 2.1 105 N/mm2 : kD/E = 2.4 10-5 )
 

Recommended element length

 

 


H200121, last changed: 27/06/2017

See also:

Table description

Table error description