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The use of the highly dependable CCVTs for powering the many unattended and remotely located telecommunications control and protection systems has enhanced the reliability and operational integrity of the entire pipeline network.
Here, we describe some of the projects in Russia which use CCVTs.
This project utilizes 85 dual CCVT stations for telecommunications (170 units total) rated at either 400, 600, 800, or 1,200 watts, and fueled by kerosene or natural gas and 36 single natural gas-fired CCVTs rated 2,000 watts for cathodic protection.
Initially, the CCVTs for telecommunications all operated in hot standby to produce autonomous power, or where mains existed, these mains were so unreliable that the units were operated in hot standby to these mains.
To accommodate the project's fuel constraints, the CCVTs have dual fuel capability, enabling full interchangeability between kerosene and gas burners.
With 200 Ormat CCVTs supplied in 1993, the total number of such units operating on Gazprom projects exceeded 600.
These CCVTs are rated at 1,200 watts and are equipped for dual fuel operation from either natural gas or arctic diesel fuel.
Recently, 28 additional Ormat CCVTs have been ordered for the telecommunications system along the Tiumen-Surgut-Novyi Urengoy gas pipelines.
More than 600 CCVTs are operating in Russia with a high degree of reliability, many since 1973, in various telecommunications and gas pipeline cathodic protection and control applications.
The Ormat arctic-type CCVT and its associated non-electric closed-loop convection heating system was selected and has provided power systems that incorporate high reliability with maintenance requirements reduced to a visit only once every six to 12 months, as well as a solution to the equipment shelter internal temperature stabilization problem.
The CCVT power unit, other than the burner and controls, is sealed for life in a stainless steel "envelope", which does not require any periodic maintenance or overhaul.
To accomplish this task the Ormat CCVT incorporates a non-electric "cogeneration" system which uses thermal energy from the heat generated in the CCVT boiler (vapor generator), and delivers this energy in the form of heat directly into the equipment shelter.
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