GE MS6001B, Maintenance Instructions Manual

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Combustion Inspection — Inspection Procedures Inspection and Maintenance — GEK 107048
CI-I-7
**WARNING**
Cleaning solutions are extremely caustic. Wear pro-
tective clothing, gloves and face shield to prevent con-
tact with skin or eyes. If solution contacts skin or eyes,
irrigate thoroughly with clean water and immediately
obtain medical aid.
CAUTION
Depending on the cleaning solution, a rinse solution is fre-
quently required. Follow the manufacturer’s recommen-
dations for cleaning solution being used.
4. Remove the parts from the cleaning solution, and spray with water and steam to knock off loosened
carbon.
5. Rinse the parts, and coat them with either clean fuel oil or light machine oil.
6. Visually inspect all parts, keeping in mind that the contact surfaces of the fuel nozzle parts are ma-
chined to a fine finish so the flow rates of fuel oil or gas and atomizing air through the nozzle as-
sembly will be within specified limits. When inspecting parts, make sure there are no dents, burrs
or nicks on any surfaces which will result in an interference on reassembly. These types of defects
could affect fuel or air flow.
Special attention should be given to the condition of the swirl slots in the fuel nozzle pilot, and
the surfaces with which the nozzle pilot are in contact. If the swirl slots show any indication of
crushing, galling or erosion, or if the surfaces with which they are in contact are not flat and
smooth, the parts must be replaced.
CAUTION
Do not attempt to remachine damaged parts. This can
cause irregular fuel flow, erratic combustion system oper-
ation, and subsequent turbine damage.
7. Inspect the outer gas swirl tip for wear at the area normally in contact with the combustion liner
cap/collar. If wear in this area is 0.030 inch or more, contact your General Electric Company Field
Service Representative for information concerning repair of the outer gas swirl tip diameter.
8. Inspect the outer tip assembly to determine if parts have been adversely affected by erosion. In-
spect the condition of the gas fuel holes in the gas swirl tip assembly. They should be sharp, not
rounded or burred. If the inlet edges of the gas holes have eroded or have been rounded or nicked,
they will affect the flow test. Figure CI-I.3 shows the components of the typical fuel nozzle.