Pipelines
Mass property attributes for pipelines are: empty- and fluid-weight; empty- and fluid-center-of-gravity; as well as empty- and fluid-moments-of-inertia.
These values are determined as follows:
Weight
- Empty
- material length by unit weight value in the dpar-pipe-weights table; added to
- insulation length and thickness by density in the dpar-insulation properties table; added to
- the weights of the inline components (see Inline Component Weights, below)
- Missing empty weight will generate a warning on the pipeline
- Fluid
- density by interior volume of the pipeline
- interior volume is calculated based on the inner-diameter value in the dpar-pipe-weights table
- density is taken from the density column of the dpar-commodity properties table or the Project Setup variable for water (if water density is used instead of a known operating density, a warning will be generated on the pipeline)
Data tables used for pipeline mass
properties are:
| dpar-commodity-properties | density of each fluid used to calculate the weight of the contents of routed pipelines. |
| dpar-insulation-properties | density for insulation types use to calculate extra insulation weight. |
| dpar-pipe-weights | unit-weight and inner-diameter values by pipe class and nominal diameter used to calculate the weight of the routed pipelines. |
Inline Component Weights
Inline components are reported as part of the pipeline and are
weighted depending on the inline type:
- Control valves use the weight value in the dpar-control-valve-properties table.
- Reducers have the same weight per length as their pipelines; however, the diameter used to calculate the weight is the average of the up- and down-stream diameters.
- Tees and flow elements are treated as pipe.
- User Defined Inlines use the weight attribute defined in the library. If there is not a weight attribute, or if the weight is zero, a warning will be recorded on the pipeline.