Capstone Turbine Corporation • 16640 Stagg Street • Van Nuys • CA 91406 • USA
Installation Guide: Capstone C1000S/C800S/C600S with C1000 Series Controller
480064 Rev C (December 2018) Page 52 of 122
Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without
incurring any obligation either with respect to equipment previously sold or in the process of construction.
5.4.4.3. High H
2
S Installations
For high H
2
S Installations, common exhaust connection is prohibited due to the
risk of corrosive, sulfuric-acid-containing, condensation draining back into non-
operational microturbines. This corrosive condensation can damage equipment
in the microturbine and would not be covered by warranty.
The combustion of H
2
S creates sulfur oxide compounds which can combine with water to create
sulfuric acid. For this reason, all exhaust ducting and any heat recovery equipment must be
stainless steel. Increase the height of the exhaust stack to 10 feet minimum to improve dilution of
the sulfur oxides.
The use of condensate drains is required and they must be located such that all condensates are
prevented from collecting in the recuperator.
5.4.5. Common Exhaust Ducting
Stagger the entry points into a common exhaust header so that individual
microturbines are not directly opposite one another. Differences in exhaust flow
may create backpressure on a turbine and limit its performance or cause
damage.
See Figure 23 for an example installation using common exhaust ducting. Ducting the engine
exhaust of multiple microturbine bays requires the use of a backflow valve for each bay’s exhaust
duct. If there are no backflow valves installed, a wiring interlock mechanism must be installed
between bays to stop the operation of all systems if any individual ceases operation.
Silencers or baffles may be used, but pressure drop and temperature rise must be considered.
Pressure should be checked by placing a pressure sensor in a sampling port in the exhaust pipe
above the microturbine. Measure actual pressure to make sure that it is below the specified
maximum.
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