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 59 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.
6.1.7. Microturbine Inlet Pressure Regulator
Fuel pressure regulation is required for each microturbine fuel inlet per the Capstone
MicroTurbine Fuel Requirements Technical Reference (Table 1), the O&I drawings, and the P&ID
drawings. This regulator will improve reliability by reducing the impact of fuel system pressure
dynamics on combustion stability.
6.1.8. Inlet Pressure Indicator
A pressure gauge, or indicator, at the microturbine fuel inlet provides a visual indication of fuel
pressure and stability, which helps in troubleshooting fuel delivery issues.
6.1.9. Purge Line
FLAMMABLE MATERIAL! Natural gas is flammable and explosive. The
discharge of any purge line must always be routed to a safe location, as per local
codes or regulations. Failure to observe this warning can result in personal injury
or equipment damage.
A purge line is used to remove dirt and particulates from the fuel line during installation or service
by allowing a temporary exit path for fuel. This same exit can also be used as a purge or vent
connection. The purge line should be installed right at the turbine inlet.
6.1.10. Flame Arrestor (Optional)
Installation of a flame arrestor is optional. Selection is dependent on the pipe size, fuel type, and
local code requirements. A flame arrestor dealer can help with sizing and selection if it is
determined that one is required.
6.1.11. Pressure Relief Valve
FLAMMABLE MATERIAL! Natural gas is flammable and explosive. The
discharge of any pressure relief valve must always be routed to a safe location,
as per local codes or regulations. Failure to observe this warning can result in
personal injury or equipment damage.
A certified pressure relief valve (set to 100 psig) is required near the fuel inlet of any microturbine
where the available fuel supply pressure may reach or exceed 1,034 kPag (150 psig) due to
existing upstream supply pressure or equipment failure. Fuel inlet pressures in excess of
689 kPag (100 psig) may prevent the microturbine from initiating a start attempt.
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