This keyword is used to define the pipe directory used for dimensioning of one or more pipes. This keyword must come before the pipe keyword.
FORMAT:
*DIAM <krit1 krit2 LIM “typ”
“typ1” d1 v1 k1
“typ2” d2 v2 k2
. . . .
“typ20” d20 v20 k20 >
Where:
krit1: is the velocity criterion in m/s.
krit2: is the gradient in Pa/m.
LIM: is the pipe diameter in mm below which the velocity criterion
and above which the gradient are to be applied.
Typ: The default pipe type is used for a possible flow route
through a ring connection. The dimension is used only when all pipes in a ring connection have unknown dimensions. In this case, the type will be specified as “typ” regardless of the dimensioning criterion. The possible flow route is indicated by * in the input data element of the printout.
typ1: name of the pipe type (max. 8 characters enclosed in inverted commas)
d1: the internal diameter for the pipe type (mm)
v1: heat transfer coefficient (W/(°C × m))
k1: roughness for the pipe type (mm)
This list may include up to 20 different pipe types. If fewer than 20 types are specified, the table must be ended with a “/” (slash).
Note that if e.g. the velocity criterion (1 m/s) is to be used for all diameters, krit1, krit2 and LIM must be 1.0, * and * respectively. Similarly, if the gradient criterion of 103 Pa/m is to be used for all diameters, krit1, krit2 and LIM must be *, 103.0 and * respectively.
Example:
*DIAM Velocity criterion 3.0 m/s
Gradient criterion 1.0 Pa/m
Limit 75.0 mm
Default pipe type “N200”
Type I.Diam v k
-----------------------------------
“N050” 48.7 0.330 0.05
“N100” 89.3 0.350 0.05
“N125” 114.7 0.320 0.05
“N150” 156.8 0.340 0.05
“N200” 189.6 0.550 0.05
“N250” 215.4 0.440 0.05
“N300” 313.4 0.550 0.05
/