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Publication Title | C200/C1000 Series Backflow Valve Inspection

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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Telephone: (818) 734-5300 • Fax: (818) 734-5320 • Web:

Service Bulletin SB0119

Date: From: Subject:

October 2013

Capstone Technical Support

C200/C1000 Series Backflow Valve Inspection

Systems Affected

All C200/C1000 Series (C600/C800/C1000) systems listed in Table 1, and any other C200/C1000 Series systems operating with a common exhaust duct with Capstone backflow valves (524248-100 or 524248-101) that have been in operation for over one year, even if not identified in Table 1.


Backflow valve malfunction or component failure on two or more microturbine systems sharing a common exhaust duct may allow hot exhaust from an operating microturbine unit to flow backwards through a non-operating microturbine unit. This may cause overheating of the generator and engine inlet components, with resulting extensive damage to those components.

This Service Bulletin specifies an inspection procedure to determine any possible conditions leading to Capstone backflow valve malfunction or imminent backflow valve component failure.

Required Action

Capstone requires an exhaust system inspection of all systems within the scope of this bulletin as described in Systems Affected section above. This inspection must be done by 30 November 2013.

The inspection consists of two separate procedures:

1. A visual inspection of the backflow valve installation and components.

2. Thermal measurement with a thermocouple inserted in the engine exhaust ducting upstream of the backflow valve, with associated measurement instruments.

Perform the inspection as directed in Work Instruction 440334.

450127 Rev A (October 2013) Page 1 of 3

This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the product specifications, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. Copy is uncontrolled; user is responsible for verifying current revision.

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