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Baker Hughes

Problem

Possible Cause

Corrective Action

Valve does not

go into full lift

Upper ring positioned too high

A. A. Lower upper adjusting ring

Foreign material trapped between disc

holder & guide

B. Disassemble valve and correct any

abnormality. Inspect system for

cleanliness.

Failure to open

at set pressure

Simmer

Improper compression screw

adjustment

A. Adjust set pressure

Lower ring positioned too low.

B. Raise lower adjusting ring

Steam line vibrations

C. Investigate and correct cause

Valve Leaking

and/or exhibits

erratic popping

actions

Damaged seat

A. Disassemble valve, lap seating

surfaces, replace disc if required.

Part misalignment

B. Disassemble valve, inspect contact

area of disc and seat bushing, lower

spring washer or spindle, compression

screw, spindle straightness, etc.

Operating too close to set pressure

C. Lower operating pressure.

Discharge stack binding on valve

outlet

D. Correct source of binding

Hang-up, or

valve does not

close completely

Lower ring positioned too high

A. Move lower ring to the left one notch

per adjustment and test. Repeat until

problem is eliminated.

Foreign material

B. Disassemble valve and correct any

abnormal condition. Inspect system for

cleanliness.

Improper disc/guide clearance

C. Verify proper clearance

Excessive

blowdown

Upper ring positioned too low.

A. Raise upper adjusting ring

Built up back pressure excessive

B. Decrease exhaust pressure by

increasing discharge stack area.

Chatter or short

blowdown

Upper ring positioned too high

A. Lower upper adjusting ring

Excessive inlet piping pressure drop

B. Reduce inlet pressure drop to less

than one-half of required valve

blowdown by redesigning inlet piping.

Valve size improper for application

C. Verify valve sizing

XV. Trouble Shooting the 1511 Series Safety Valve

Содержание Consolidated 1511 Series

Страница 1: ...Consolidated 1511 Series Safety Valves Instruction Manual Rev E Baker Hughes Data Classification Public...

Страница 2: ...UIREMENTS FOR OPERATION OF OTHER EQUIPMENT AT THE SITE THESE INSTRUCTIONS DO NOT PURPORT TO COVER ALL DETAILS OR VARIATIONS IN EQUIPMENT NOR TO PROVIDE FOR EVERY POSSIBLE CONTINGENCY TO BE MET IN CONN...

Страница 3: ...ance All the United States Customary System USCS values are converted to metric values using the following conversion factors USCS Unit Conversion Factor Metric Unit in 25 4 mm lb 0 4535924 kg in2 6 4...

Страница 4: ...16 E Spindle Runout 16 F Spring and Spring Washers 17 G Lift Restrictor 17 XII Inspection and Part Replacement A General Information 17 B Specific Steps 17 XIII Reassembly 20 XIV Setting and Testing A...

Страница 5: ...nstructions if necessary on how to avoid the hazard The top panel of the format contains a signal word DANGER WARNING CAUTION or ATTENTION which communicates the level of hazard seriousness The center...

Страница 6: ...the valve is removed Exercise care when examining a safety valve for leakage Prior to each actuation assure that no personnel are near the valve Steam escaping from the valve during actuation can poss...

Страница 7: ...not so satisfied contact Baker Hughes if there are any questions relative to tools methods The installation and start up of valves and or valve products may involve proximity to fluids at extremely hi...

Страница 8: ...essure is the static pressure existing at the outlet of a safety valve device due to pressure in the discharge system Blowdown Blowdown is the difference between actual popping pressure of a safety va...

Страница 9: ...its function in holding one or more pressure containing members in position Rated Lift Rated lift is the design lift at which a valve attains its rated relieving capacity Safety Valve A safety valve...

Страница 10: ...ed to prevent dirt from entering the outlet port while bolting in place While hoisting to the installation care should be exercised to prevent bumping the valve against steel structures and other obje...

Страница 11: ...Pin 6 Upper Adj Ring 7 Upper Adj Ring Pin 8 Yoke 9 Yoke Cap Screws 10 Spindle Assembly 11 Spring Washer 12 Spring 13 Compression Screw 14 Compression Screw Nut 15 Cap 16 Cap Set Screw 17 Lever 18 Rele...

Страница 12: ...ing backward through the drip pan In no case should the pipe connected to the valve be of a smaller size than the valve outlet Know all valve exhaust leakage points to avoid possible severe personal i...

Страница 13: ...e preventing variation in the set pressure Valves must be readjusted if insulation is installed Weather shielding should be used to protect the spring and to minimize rain or snow from entering the va...

Страница 14: ...ight up to remove the disc from the valve body Engage the drop through threads of the disc and unscrew it from the spindle 11 Measure from the top of the combination guide and upper ring to the top of...

Страница 15: ...procedure for reconditioning the seating surfaces of the disc and seat bushing is outlined in Section XI C C Lapping Procedures 1 General While the finer points of lapping may be considered a mechani...

Страница 16: ...rface is flat clear and mirror like wipe all traces of grinding compound from the part and begin reconditioning the other seat Note Do not place the disc in a vice to accomplish lapping procedures as...

Страница 17: ...F Spring and Spring Washers Spring wire that is irregularly spaced or the ends are not parallel are sufficient causes for replacement The spring washers are machined to fit the ends of the spring the...

Страница 18: ...ection Dimensions Orifice F 002 003 in 0 05 0 08 mm 1 G in mm in mm H 028 0 71 062 007 1 57 0 18 J 028 0 71 062 005 1 57 0 13 K 028 0 71 062 007 1 57 0 18 L 028 0 71 062 007 1 57 0 18 M 028 0 71 062 0...

Страница 19: ...e disc and upper adjusting ring Instructions Section XI B When the E dimension is reduced by machining or lapping to the minimum given in Table 8b the valve seat bushing should be remachined to the gi...

Страница 20: ...asher and spindle to disc pocket should each be ground together to attain a perfect match This is done by applying a lapping and grinding compound of about 500 grit on one of the surfaces and rubbing...

Страница 21: ...duct two more verification tests b If in raising the boiler pressure the valve does not pop open within 3 percent overpressure for ASME Section I valves or 10 percent overpressure for ASME Section VII...

Страница 22: ...notch that provides a minimum of simmer and does not interfere with the blowdown of the valve f If the valve pops open then drops out of lift like it was going to close but remains open at a very low...

Страница 23: ...in Table 9 8 Once the valve has tested in compliance with the appropriate standard conduct two more verification tests All external adjustments should be sealed after completing final setting 9 Proce...

Страница 24: ...Section I of the ASME Code and should be adjusted for the particular application C Presetting the Adjusting Rings B 2 Application of Test Gags All Pressures 1 Refer to Figures 1 2 on Section VIII Remo...

Страница 25: ...o 13 Notches Q 60 48 Down Two Turns Down 9 to 15 Notches Periodic tests may be required for verification of valve set pressure The Consolidated EVT provides for this capability However set pressure is...

Страница 26: ...spindle straightness etc C Operating too close to set pressure C Lower operating pressure D Discharge stack binding on valve outlet D Correct source of binding Hang up or valve does not close complet...

Страница 27: ...Ball End Spindle Washer Bearing Radius Compression Screw Bearing End Lapping Compounds Brand Grade Grit Lapping Function Size Container Part No 1 Clover 1A 320 General 4 oz 1993 2 Clover 3A 500 Finish...

Страница 28: ...ation PART CLASSIFICATION REPLACEMENT FREQUENCY PREDICTED AVAILABILITY CLASS I MOST FREQUENT 70 percent CLASS II LESS FREQUENT BUT CRITICAL 85 percent CLASS III SELDOM REPLACED 95 percent CLASS IV HAR...

Страница 29: ...the serial number is stamped on the top edge of the outlet flange Be sure to include the one or two letters preceding the figures in the serial number A typical valve nameplate is shown in Figure 11 C...

Страница 30: ...11 Spring Washers 2 1 Set 5 1 Set 3 12 Spring 1 5 1 3 13 Compression Screw 1 5 1 3 IV 9 Yoke Cap Screws 1 5 1 3 99 percent 14 Compression Screw Nut 1 5 1 3 15 Cap 1 5 1 3 16 Cap Set Screw 1 5 1 3 17 L...

Страница 31: ...to perform specialized repairs and product modi cations e g bushing replacements hydroset calibrations electromatic relief valve repairs code welding pilot replacement etc For further information plea...

Страница 32: ...t information The Baker Hughes logo Consolidated EVT and Green Tag are trademarks of Baker Hughes Company Other company names and product names used in this document are the registered trademarks or t...

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