Name: 9905-792 WOODWARD
Price: 6588 CNY
Availability: InStock

Description

Woodward 9905-792 Governor Operational Procedure‌

‌Applicable Systems:‌ Steam Turbines / Gas Compressors (ISO 10438 API Oil Systems)

‌Pre-Operational Checks‌

‌Hydraulic Fluid Verification‌
- Use ISO VG 32 turbine oil (MIL-PRF-6083 compliant)
- Oil cleanliness: NAS Class 7 max (β₅≥200)
- Reservoir level: Maintain between ¾ sight glass
‌Linkage Setup‌

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• Lever ratio: 2:1 (bellcrank to servo) • Neutral position: - Servo piston midway @ 50% stroke - Compensation needle valve 1.5 turns open • Friction torque: ≤0.15 Nm (validate with spring gauge)

‌Startup Sequence‌

‌Step 1: Priming‌

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1. Open bypass valve V-72 (counter-clockwise 8 turns)

2. Engage manual startup knob: Pull-rotate 90° CCW

3. Observe oil pressure:

   - Minimum 1.4 bar (20 psi) at 500 RPM

   - Operating 2.8-3.5 bar (40-50 psi)

4. Close bypass when RPM exceeds 15% of rated speed

‌Step 2: Synchronization‌

‌Control‌	‌Adjustment Range‌	‌Calibration Reference‌
Speed Droop	3-5%	42 RPM/V @ 3600 RPM
Compensation	0.8-1.2 sec	Dashpot oil viscosity 70 cSt
Speeder Spring	10% RPM/turn	Scale mark “7” = 105% overspeed

‌Dynamic Calibration‌

‌Procedure:‌

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1. Stabilize at 80% load:

   • Record natural frequency: Typical 2.1-2.4 Hz

2. Step load change test (25% → 75%):

   - Settling time: ≤4 sec (per API 612 Chap. 4.9)

   - Maximum overshoot: ±1.5% of setpoint

3. Compensation tuning:

   a. Close needle valve clockwise until hunting occurs

   b. Open ¼ turn counter-clockwise

   c. Verify stability under 100% load rejection

‌Critical Adjustments‌

‌Stability Tuning Limits‌

‌Parameter‌	‌Min‌	‌Max‌	‌Tool‌
Droop setting	3%	8%	Hex key 3/16″
Compensation rate	0.5 sec	4.0 sec	Flat screwdriver #2
Speeder preload	5%	15%	Torque wrench 6 lb-in

‌Prohibited Actions‌

Never operate with 9907-238 booster disconnected
Avoid continuous operation below 20% load
Do not exceed 115% overspeed trip setting

‌Troubleshooting Matrix‌

‌Symptom‌	‌Probable Cause‌	‌Corrective Action‌
Hunting (±5% RPM)	Air entrainment / Low oil level	Deaerate via vent plug P-88
Slow response (>8sec)	Worn servo piston ring	Replace seal kit SK-9905-72
Speed drift (1-2%/hr)	Compensation leak	Test dashpot O-ring (PN 10-1784)

‌Shutdown & Lockout‌

‌Normal Shutdown‌

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a. Reduce load to minimum b. Engage manual knob (CW rotation) c. Close isolation valve V-15 d. Drain oil at plug D-9 if ambient <0°C
‌Emergency Lockout‌

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[Mechanical Locking Procedure] 1. Install safety pin through hole L-86 2. Apply padlock (Shield PK-7900) 3. Tag-out per OSHA 1910.147

9905-792 WOODWARD pdF

9905-792 WOODWARD

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