The 9907-1248 is replaced by the 9907-1978 QuickTrip trip block assembly designed for use in steam, gas, and hydro turbine shutdown systems for quick and reliable dumping of the turbine’s trip oil header. This integrated trip block assembly is intended for use on mechanical-drive or generator-drive turbines that use low pressure (5–25 bar / 73–363 psi) hydraulic trip oil headers.
Integrated 2-Out-Of-3 Voting
The QuickTrip’s fault tolerant design makes it ideal for critical turbine applications, where turbine up-time and availability are essential. This trip block assembly’s 2-out-of-3 voting design provides users with a very high level of system reliability as well as compliance with industry standard API-670. This trip block assembly is housed in a fully integrated package which includes three patented, dirt-tolerant rotary trip valves. These valves are connected to provide two-out-of-three based voting to ensure that a failure of any one component (valve driver, valve, wiring, connector, etc.) does not result in a nuisance trip condition. The QuickTrip’s modular design also allows users to replace critical components (electrical module, solenoid, wiring, driver, etc.) while the turbine is operating on-line.
Robust Design
The QuickTrip’s robust design (corrosion resistant materials, three independent moving rotary valves, 25 lb chip shear force, and self-cleaning port design) makes it perfect for challenging applications where dirty or contaminated oil may be present. Specifically designed for steam turbine applications where turbine lube oil is also used to power the hydraulic turbine control valve actuator(s). Steam turbine applications can be extremely challenging for hydraulic trip block assemblies as dirt, metal shavings, water, and other contaminants (Babbitt metal, ammonia, etc.) are common in such oil systems. Also due to the high temperatures at which steam turbines operate, turbine oil breakdown is common, resulting in the creation of a sludge-type substance and the varnishing of internal system components.
Redundancy / Availability
Designed for use in critical steam turbine applications where turbine up-time is important, the QuickTrip uses three isolated solenoid valves designed to be driven by a triple modular redundant 2-out-of-3 voting based safety logic solver. Each isolated solenoid valve uses redundant power supply inputs to increase both system reliability and availability. Note: Only one power source is required to power/energize each of the isolated solenoid valves.
Valve Status (Local & Remote)
Valve Status (local & remote)—Each valve solenoid accepts power for one or two (redundant) power sources and has the following status indications to assist operators with understanding the status and health of each valve.
- Valve Open—Local LED
- Valve Open—Limit Switch
- Valve Closed—Local LED
- Valve Closed—Limit Switch
- Power Supply #1 Healthy – Local LED
- Power Supply #2 Healthy – Local LED
On-Line Repairable
The QuickTrip’s modular design allows repair/replacement of each valve’s driver solenoid, electrical module, and associated power supplies and wiring to increase both system reliability and availability.
Application Notes
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