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Vaporizer Design Considerations
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Design Considerations - index
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Distributed Control Systems (DCSs)


DOE-HDBK-1132-99
Simple check valves without external actuation should never be used as stop
valves and should be used as flow reversal preventers.
Butterfly valves should be used for stop valves or for throttling purposes in water
systems.
Ball valves should be used for bubble-tight stop valves in relatively clean fluid
services.
Plug valves can be used for bubble-tight stop valves in a variety of fluid services.
Diaphragm valves are used as stop valves in variety of services from clean to
dirty fluids including liquids with suspended solids and scale-forming liquids.
4.
INSTRUMENTATION AND CONTROLS CONSIDERATIONS
This section contains design considerations useful to instrumentation and control design
personnel. Data and digital control systems are undergoing dramatic changes as
workstations and electronic storage media become less expensive. The guidance in this
section is based on experience with existing instrumentation and control systems. The
designers of new facilities should consider the use of " est available"proven technology
b
for new instrumentation and control systems.
4.1
Control Centers/Control Rooms . Control centers or control rooms play a vital role in
the operation of a facility. The following factors should be addressed in the design of a
control center or control room:
number of required operating personnel;
number and types of processes to be operated;
duties of operating personnel;
control panel and consoles arrangement;
operator man-machine interface;
instrument equipment functions;
testing considerations;
II-40


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