3-1-105

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2020

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Mechanical Engineering

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Nov 24, 2024

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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: 3.1/105 ISSUED: April 1990 REVISED: PRODUCT: Mars MODEL(S): All Specifics: SUBJECT: MARS PRIMARY AND SECONDARY GAS FUEL OPERATOR VALVES Type of Change: Product Reliability Recommended Compliance: Earliest Convenience Purpose: To recommend inspection of primary and secondary gas valves to assure proper operator-valve is installed, and provide instructions for improved piping arrangement for the secondary gas-valve operator. GENERAL INFORMATION: In some instances, difficulty has been experienced with the operator valve for the primary and sec- ondary gas shutoff-valves when the O-Rings on the spool were not retained in the O-Ring grooves. Accordingly, improved design O-Ring retention has been incorporated on factory units for several years. However, there is concern that there maybe units in the field that have not been modified. The improved design involves a change from perpendicular to dovetail-shaped O-Ring grooves on the valve spool. Factory testing and field experience to date indicate that this modification has resolved the problem. Also, gas supply piping to the secondary shutoff valve can have different configurations. Some configurations may not provide adequate supply of gas to the valve (see Figure 1). SERVICE BULLETIN Page 1 of 3 NUMBER: 3.1/105
ACTION REQUIRED: Visually inspect existing primary and secondary operator valves to confirm that the latest vendor design/part number changes have been incorporated. The primary operator-valve is part of the pri- mary shutoff valve assembly (Solar P/N 916115C3) and is base-plate mounted. The secondary operator-valve (Solar P/N 916154C2) uses NPT connections. Inspect and modify gas supply piping to secondary operator-valve if not in conformance with re- quirement specified herein. Procedures: 1. Check Mars turbine units in the field that have primary shutoff valve P/N 916115C3 and secondary operator-valve P/N 916154C2 to ensure that the operator valves are the latest configuration. If these valves are not of the latest configuration, proceed to steps 2 and 3 below; otherwise go to step 4. 2. Remove Vendor P/N RPA-4339-159-3322V, part of primary shutoff valve (Solar P/N 916115C3) and replace with Solar P/N 186327-1 (Vendor P/N RPA-4339-159-3322X). 3. Remove secondary shutoff valve operator (Solar P/N 916154C1) and install secondary shutoff valve operator, Solar P/N 91654C2 (Vendor P/N RPA-4329-159-3327). 4. Improve gas supply to the secondary shutoff pilot valve as indicated (see Figure 1). 5. Visually check the secondary shutoff operator valve (Solar P/N 916154C2) supply plumbing. 6. If the operator valve supply plumbing is connected downstream of the pilot filter, FS 932 (Solar P/N 916121C1), remove plumbing as shown in Figure 1. Refer to Table 1 for required parts. 7. The operator valve supply plumbing must be connected only to the sensing line of S342 as shown in Figure 1. Table 1 Parts for Plumbing Changes Solar P/N Description Quantity 915319C1 Cap, 0.375 2 24036R1 Union, 0.375 1 24715R1 Elbow, MF, 0.375 1 24022R1 Elbow, MM, 0.375 4 23900R1 Tee, 0.375 1 952674C1 Tubing, 0.375 6 Feet Page 2 of 3 SERVICE BULLETIN NUMBER: 3.1/105
Table 1 Parts for Plumbing Changes (Cont’d) Solar P/N Description Quantity 24073R1 B-Nut, 0.375 10 24082R1 Sleeve, 0.375 10 Figure 1 Gas Valve Control Plumbing SERVICE BULLETIN Page 3 of 3 NUMBER: 3.1/105
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