How to calculate Width Piperack
Pipe Rack is one of key system in therefineries, power plant and
chemical plantsfor carrying thepiping, cable trays etc from one
unit to other units for plant connectivitys. Sopiperackplay very
important role whiledesigning of plant layout.
The width of pipe rack is calculated on the based on these
parameters.
1. Number of lines2. Electrical/instrument cable trays.3. Space
for future lines.Thewidth of a piperackmay be calculated using the
following method: First estimate number of lines as described. Add
up the number of lines up to 18 diameter in the densest section of
the piperack.The total width in meters (W) will be :W = ( f x N x S
) + A metersWhere f, safety factor = 1.5, if the lines have been
laid out as described in initial evaluation.Where f, safety factor
= 1.2, if the lines have been laid out as described under
development.N = number of lines below 18 diameterS = average
estimated spacing between lines in millimeters.
Usually - S = 300 mmUsually - S = 230 mm ( if lines in piperack
are smaller than 10 )
A = additional width required meters for:
1. Lines larger than 18.2. Future lines.3. Instrument and
electrical cable trays.4. Any slot forpump discharge lines500 mm -
1 meter.
The total width is thus obtained. If W is bigger than 9M usually
two piperack levels will be required.
Note : At the beginning of a job, `W` should usually include 30
- 40% of clear space for future lines.
The width of the piperack may be increased or determined by the
space requirement, and/or access to equipment arranged under
thepiperack.
