3-6-101

pdf

School

University of the People *

*We aren’t endorsed by this school

Course

2021

Subject

Mechanical Engineering

Date

Nov 24, 2024

Type

pdf

Pages

Uploaded by engminamaged1991

SERVICE BULLETIN NOTICE: The Type of Change and Recommended Compliance specified reflects Solar’s best judgment regarding the Service Bulletin. All questions should be directed to your Solar Field Service Representative. Solar, Saturn, Centaur, Taurus, Mercury, Mars, Titan, SoLoNOx, and Turbotronic are trademarks of Solar Turbines Incorporated. Cat and Caterpillar are trademarks of Caterpillar Inc. Specifications subject to change without notice. NUMBER: 3.6/101 ISSUED: January 2001 REVISED: PRODUCT: Mars 90S/100S MODEL(S): ALL Specifics: Maintenance for Emissions Compliance SUBJECT: MAINTENANCE OF MARS GAS ONLY SOLONOX PACKAGES FOR EMISSIONS COMPLIANCE. Type of Change: Product Information Recommended Compliance: Information Purpose: To provide a set of guidelines for inspection and maintenance of SoLoNOx equipment to ensure emissions compliance. GENERAL INFORMATION: The SoLoNOx combustion system utilizes lean premix technology to maintain a uniform combus- tion temperature that minimizes CO and NOx formation. The SoLoNOx system is comprised of components located on the package skid and turbine engine that must work in concert under PLC control to obtain optimum combustion parameters. Periodic inspection and maintenance specific to the SoLoNOx system is necessary to assure proper function and emissions control. Recommen- dations are presented in this Service Bulletin that have been developed through Solar’s experience supporting, maintaining and operating Mars SoLoNOx turbine packages. SERVICE BULLETIN Page 1 of 4 NUMBER: 3.6/101

ACTION REQUIRED: The following inspection and maintenance procedures are recommended to be performed on a semi- annual basis. This Service Bulletin is meant as an addition to the Solar Installation and Maintenance manual under the Engine chapter. Inspection and Maintenance 1. Compressor Cleanliness A fouled compressor reduces mass flow and PCD (Pressure, Compressor Discharge), and can distort the airflow at the combustor inlet. These conditions adversely effect emissions. The compressor section of the turbine should be borescoped semi-annually to determine the level of fouling and effectiveness of cleaning and inlet air filtration. Compressor on crank cleaning is typically required at least semiannually to maintain desired performance. More frequent cleaning may be required. Instructions for Engine Compressor Ingestive Cleaning are in the Engine chapter of this manual. 2. Fuel system inspection Contaminants in the fuel can block the fuel injector spokes to cause improper fuel/air distribution and high emissions. Fuel must continuously comply with requirements de- scribed in Solar specification ES 9-98. At the semi-annual maintenance all fuel filters, on the package and off skid, should be inspected for signs of contamination and liquids in accordance with the Fuel chapter of this manual. The drain plugs on the bottom of the main and pilot fuel manifolds should be removed and checked to see if any liquids are present. Evidence of liquids in the gas system indicates the fuel treatment is inadequate and additional filtration or fuel heaters may be required. 3. Fuel injector inspection At the semi-annual maintenance, all injectors should be removed and inspected as de- scribed in the Engine chapter. The presence of plugging or contaminants indicates that off skid fuel filtration may be required to prevent reoccurrence. Consult the Solar Dis- trict Service Office for recommendations on cleaning fouled fuel injectors. 4. Trend of T5 Pattern Each engine has a unique T5 pattern that typically should not change significantly over the life of the engine. If this T5 pattern changes over time, plugged fuel injectors, or combustor liner distress may be the cause. The full load T5 pattern should be trended to identify any changes. At full load, T5 thermocouples relationship should not change. Figure 1 shows a plot of individual thermocouple temperature difference form the T5 average temperature. A change of 60 F or greater from the baseline on two or more ther- mocouples should prompt further investigation. In the example shown, the high temper- ature variation indicated fouled fuel injectors caused by fuel-born contaminants leading to elevated emissions levels. Page 2 of 4 SERVICE BULLETIN NUMBER: 3.6/101

Figure 1 Plot of Individual T5 Thermocouple Difference From Average 5. Gas System Pilot Fuel The pilot fuel system controls flame stability in non-SoLoNOx mode (below 50% load) and during load transients. The amount of pilot fuel is regulated through three separate pilot circuits, known as pilot 1, pilot 2, and pilot 3. At stable conditions over 50% load, the pilot 1 and pilot 3 should be closed. Prior to the shutdown for semiannual mainte- nance, verify the valve positions on both the control system display and physically on the package. Verify pilot 1 and 3 are closed when commanded by the PLC. SERVICE BULLETIN Page 3 of 4 NUMBER: 3.6/101

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

6. Bleed Valve Operation Bleed valve leakage during full load operation can elevate NOx emissions. Prior to the semiannual maintenance, verify at full load the bleed valve is closed. The bleed duct temperature indicates bleed valve leakage. After stabilization at full load for 45 minutes, bleed duct temperature should be under 250 F. Temperatures over 250 F indicate the bleed valve leakage. Refer to the Engine chapter of this manual for bleed valve removal and inspection procedures. Page 4 of 4 SERVICE BULLETIN NUMBER: 3.6/101