9
GA0383P02 Rev. C
System Design Considerations
The GCM-A system consists of the detector unit (the GCM-A itself) and an associated air
sampling system. When designing a system for a particular application, one needs to
consider:
a) The configuration of the generator’s cooling system. In particular, it is important to
know whether the application is a single pass (open) or enclosed (closed) cooling circuit.
This will play a major role in the sampling system design layout. A cooling system
schematic and sectional views of the generator are valuable to this process and should
be provided to Environment One.
b) The mounting location of the GCM-A cabinet. The particular location of the GCM-A
cabinet will play a role in the sampling system design layout and electrical connections
and will also assist in identifying key mechanical installation considerations. For
example, if the GCM-A is to be mounted near or on the generator’s exterior case, the
generator OEM may need to be contacted for information, approval and/or instruction.
Consideration of these and other mechanical factors will facilitate installation.
c) The distance between the GCM-A cabinet and the farthest point the sampling
system will reach. This information is key to the transit time analysis of the sampling
system. Identification of physical obstacles and/or considerations that will impact the
specific piping layout will also be considered. Often, the cooling system schematic
referred to above will provide much of the information sought.
d) The preferred piping material to be used in the sampling system. The GCM-A’s
sampling system can employ a variety of pipe sizes and types. Environment One does
not supply the sampling system’s pipe, but will be interested in learning whether the
power plant has a preference for a particular material – for example, a plant may have a
supply of 1/2-inch conduit left over from electrical service installations throughout the
plant; this material could be viewed as the preferred sampling system pipe. Environment
One will ask the plant whether there is a preference in this regard. Typically, 3/8-inch
NPT is used in a GCM-A sampling system.
To Next Page
Loading...