Section 2.
DESIGN CONSIDERATIONS
1.
SEQUENCE. The process of piping system design will normally proceed in
the order listed below. Many reiterations will be required before a
satisfactory system design is completed.
a.
System schematic.
b.
Fluid flow analysis and capacity.
c.
System pressures determination and preliminary assignment of hazard
category.
d.
Material selection (including economic factors).
e.
Structural adequacy.
f.
Vibration and fatigue.
g.
Maintenance (including cleaning).
h.
Special considerations.
2.
PROCEDURES.
a.
The system schematic diagram which can also be called the piping
network, is a single line diagram showing all the interconnecting pipes
required to move the gasses or liquids from their point of supply to the
storage location then to their usage site and finally the means of disposal,
if required.
b.
The fluid flow analysis will determine the fluid flow rates or
capacities, pressures, characteristics, approximate pipe lengths and inside
diameters, control valves and redundant or bypass piping required.
c.
System pressure analyses will use the maximum operating capacities
and pressures with maximum and minimum temperatures to determine the nominal
pipe wall thickness, pipe fittings, and valves required, and to initiate
hazard assignment.
d.
Material selection for pipes, fittings, and valves will be made
based upon consideration of the following factors.
(1)
System hazard category.
(2)
Experience with the materials.
(3)
Compatibility of materials with contained fluids.
(4)
Compatibility of pipe materials with adjoining materials.
(5)
Compatibility of materials with the environments.
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