بحث هذه المدونة الإلكترونية

الأحد، 1 مايو 2016

Ansaldo Gas Turbine_component_HCO_part2


  HCO   ( Hydraulic clearance optimization ) 
                 
    او RDS ( Rotor Displacement system)
Part_2


لمشاهدة الجزء الاول اضغط على هذا الرابط http://goo.gl/ypDQVu

فى هذا الجزء سوف نتناقش المشاكل اللى ممكن تواجهنا بالنسبه لتشغيل نظام HCO وكيفية التغلب عليها


The following events may occur:

1-    High pressure in the not‐loaded chamber: bearing stress condition
      When a channel is not activated, the pressure must be low. A pressure increase can indicate a
       Bearing stress and a damage.
      In case of pressure > P.HSO.07 all feed valves in the main and secondary channels are closed and the return valves opened. If 10s after opening the return valves, no pressure reduction still takes place, then a GT trip is issued and corresponding alarms issued

2-      High pressure in the loaded secondary chamber
      In case of special conditions during GT start up (cold bearing and cold lube oil), it is possible that
      Pressure in the secondary chamber increases due to thermal expansion of the lube oil.

       The following Actions must be taken:
      If the pressure is > P.HSO.100 for more than 10 s, the secondary return valve must be opened and The alarm issued. The valve is closed again when the pressure is < P.HSO.101.
      In case the pressure is > P.HSO.102 for more than 10 s, a GT Trip shall be issued for too high pressure in secondary chamber.


3-      Low pressure in the loaded chamber
      When a channel is activated, the pressure must be higher  than P.HSO.09 otherwise a defined axial position of the rotor is no more guaranteed.
      In case of pressure < P.HSO.09, an alarm is issued.
     GT trip occurs in case of fault to both (2v2) pressure transducers in return main line or in return secondary line.

Notes that:
1-    When low pressure is in the main channel (RDS ON), the RDS system shall be manually deselected by the operator
2-    When low pressure is in the secondary channel (RDS OFF), the RDS system shall be manually selected by the operator
3-      Warning: In case the RDS selection is not possible or not desired, the GT shall be operated       
                 as much as possible in a stable way (i.e. avoid sudden load change)
4-      The axial position of the shaft is monitored through the linear transducers MBA10CG101 /102.
5-      When the RDS is activated (main channel pressurized), the shaft shall reach the proper position G.HSO.02 within the time K.HSO.05 otherwise a deactivation of the RDS system occurs.
6-      in case the position is attained too quickly (<K.HSO.10) an alarm is issued but automatic
deselection of RDS does not occur
7-      When the RDS is de‐activated (secondary channel pressurized), the shaft shall reach the proper position G.HSO.01 within the time K.HSO.11 otherwise the RDS pre‐selection is reset and an alarm is issued.
8-      in case the null position is attained too quickly (<K.HSO.10) an alarm is issued and the RDS preselection is reset.
9-      Warning: In case of too quick movement of the shaft (to G.HSO.01 or G.HSO.02 position), a bearing damage can occur.

10-   Before any GT start up, the main and secondary channels are purged in order to remove any air via the return line to the lube oil tank.
11-   Warning: In case the shaft in not in the NULL position, it shall be brought to the NULL position (< G.HSO.01) before initiating the GT start up (manual command).
                              Activation of the RDS is possible only 1 hour after reaching FSNL 
                           condition (time K.HSO.04). Loading / unloading according to the allowed
                                gradients can be performed with the operating RDS system
اى يتم تشغيل HCO بعد مرور ساعه من وصول الوحده الى الـ  full speed  

فى الجزء الثالث سوف نتحدث عن وضع الـHCO  فى حالة الـ trip or shut dowun

                      


ليست هناك تعليقات:

إرسال تعليق