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
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