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MODEL 199

DIFFERENTIAL PRESSURE UNIT (DPU)

Standard and NACE Service

User Manual

Manual No. 9A-10030, Rev. 01

January 2008

CONTENTS

Section 1 - Introduction .................................................................. Page 3

Section 2 - Theory of Operation .................................................... Page 5

Section 3 - Installation/Operation ................................................ Page 9

Section 4 - Maintenance, Adjustment, & Calibration ................. Page 13

4-1. Tools Required for Maintenance and Calibration ............. Page 13

4-2. DPU Inspection and Cleaning............................................. Page 13

4-3. Calibration Setup .................................................................. Page 18

4-4. Torque Tube Rotation Check (Replacement Units) ......... Page 18

4-5. Range Change ....................................................................... Page 19

4-6. Setting Bellows Travel .......................................................... Page 22

4-7. Bellows Unit Assembly (BUA) Replacement .................... Page 22

4-8. Attaching Drive Arm to Torque Tube ................................. Page 24

4-9. Drive Arm Tightness Test .................................................... Page 24

4-10. Adjusting Pulsation Dampener ......................................... Page 25

4-11. Troubleshooting .................................................................. Page 25

Section 5 - Parts Drawing/List ....................................................... Page 27

Section 6 - Outline Dimension Drawings ..................................... Page 30

(This manual is for the DPU only.) Refer to the appropriate (separate)

instrument manual for information on the instrument being actuated.

Summary of Contents for Barton 199

Page 1: ...ng Page 13 4 3 Calibration Setup Page 18 4 4 Torque Tube Rotation Check Replacement Units Page 18 4 5 Range Change Page 19 4 6 Setting Bellows Travel Page 22 4 7 Bellows Unit Assembly BUA Replacement Page 22 4 8 Attaching Drive Arm to Torque Tube Page 24 4 9 Drive Arm Tightness Test Page 24 4 10 Adjusting Pulsation Dampener Page 25 4 11 Troubleshooting Page 25 Section 5 Parts Drawing List Page 27 ...

Page 2: ...Barton instrument is as stated on the back last ...

Page 3: ...e and a torque tube assembly Shaft The pressure housings are con nected by Pipe or tubing to the primary device located in the sys Mounting tem piping Variations in differen Bracket tial pressure within the pressure housings cause the bellows to expand or contract in a linear direction towards the side having the lowest pressure The linear movement of the bellows is converted into angular rotation...

Page 4: ...Low Pressure LP Head 35 575 cc 30 490 cc 35 575 cc 30 490 cc High Pressure HP Head 31 510 cc 26 425 cc 31 510 cc 26 425 cc Displacement in cu in cc for full scale travel 0 5 8 2 cc 1 5 25 cc 0 5 8 2 cc 1 5 25 cc NOTES Zero center or split ranges available on special order e g 0 50 w c 0 124 mbar range may be ordered 25 0 25 w c 62 0 62 mbar or 10 0 40 w c 25 0 99 mbar Intermediate DP ranges availa...

Page 5: ...e housing has two tapped connection ports one port is located in the top of the housing the other port is located in the bottom of the housing The pressure housings may be rotated 180 degrees to facilitate connection at the top of the housing for draining when used in gas service or at the bottom to provide venting when used in liquid service The housings enclose the bellows on each side of the ce...

Page 6: ...anges refer to Table 1 1 act with the bellows and torque tube to balance the differential pressure applied to the unit The number of springs used and their spring rate depends on the individual differential pressure range requirement Drive Arm Hole Plug DO NOT LOOSEN Retainer Screws Torque Tube Gland Nut DO NOT LOOSEN Range Spring Assembly Push Rod Torque Tube Lock Shaft Range Nut Springs 2 1 8 Be...

Page 7: ...he drive arm to the torque tube as a rotary motion Since the torque tube is attached to the center plate the tube must twist when subjected to torque The torque tube shaft which is freely supported within the torque tube at its outer end but connected to the torque tube and drive arm at its inner end rotates through the same angle as the differential pressure unit NOTE An extended torque tube is u...

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Page 9: ...ng Standard Practices A All Applications flow and liquid level 1 Shorten the distance between the primary device and the DPU as much as possible Distances exceeding 100 feet are not recommended For distances up to 50 feet use 1 4 inch or 3 8 inch pipe or tubing For runs of 50 to 100 feet use 1 2 inch pipe or tubing The recom mended limitation does not apply if an air purge or blow back system is u...

Page 10: ...uid will be required The special seal fluid media characteristics are such that the above conditions cannot be met a special reference leg seal fluid will be required The special seal fluid must not be volatile and must not be miscible with the process media Also the difference in the densities of the special seal fluid and the process media will require compensation in calculating the differentia...

Page 11: ... the instrument 3 Check the manifold and piping for leaks as follows a Open the bypass valve s then open one shutoff valve to pressurize the instrument b Close the shutoff valve and the bypass valve c Any leakage will be indicated by pen or pointer movement up or down scale NOTE Be careful not to subject the DPU to unnecessary shock or over range pressure during operations 11 ...

Page 12: ... Blank Page 12 ...

Page 13: ...rque wrench Housing bolts 4 2 DPU Inspection and Cleaning WARNING High pressure Gas Installations with pressures greater than 200 psig HIGH PRESSURE GAS HAZARD ON DISASSEMBLY OF THE DPU TO PREVENT POSSIBLE SEVERE PERSONAL INJURY DEATH OR SUBSTANTIAL PROPERTY DAMAGE DUE TO THE RELEASE OF INTERNAL PRESSURE PERFORM THE PRESSURE CHECK PROCEDURE THAT FOLLOWS Step A BEFORE REMOVING THE DPU HOUSING BOLTS...

Page 14: ...T i g h t e nt h eb o l t s a n dr e t u r nt h eu n i t t ot h ef a c t o r yf o r r e p a i r ...

Page 15: ...1 2 20 x 7 12 0199 1001C Yes 105 180 Note 4 Steel Nut 1 2 20 24 0199 1002C 6000 Steel Bolt 1 2 20 x 6 12 0199 1346C Yes 105 180 Note 4 Steel Nut 1 2 20 12 0199 1002C NOTES 1 Lubricants Molykote G paste Teflon base pipe dope graphite base grease or similar lubricants Lube first 2 threads only Do not lube bearing surface 2 Torque on bolts is accomplished in 3 or 4 steps Tighten UNIFORMLY 3 Rotation ...

Page 16: ...teel Quantity 6 12 12 Bolt Part Number 0220 1075J S408 0064Z S408 0064Z Nut Part Number N A S408 0021Z S408 0021Z HSG Gasket 0001 1140R S528 0001Z S528 0001Z HSG O RIng 0001 1099R N A N A Torque ft lbs 55 60 55 60 55 60 SPECIAL NOTES 1 Lubricants Molykote G paste Teflon base pipe dope graphite base grease or similar lubricants Lube first 2 threads only Do not lube bearing surface 2 Torque on bolts...

Page 17: ...a Apply the parts and use the torque values for the 2000 PSI model Table 4 3 4 For DP units marked as 1500 PSI 10 3 MPa originally supplied with 6 point head bolts use a standard B7 alloy steel bolt that is suitable only for applications where the application environment is not deemed to be sour WIth the exception of 0199 0085C bolts apply the parts and use the torque values for the 2000 PSI model...

Page 18: ... replacement units or as actuators for other applications are checked for accuracy prior to shipment All Barton instruments using 199 DPU as actuator are calibrated at the factory All DPUs sold as replacement units or as actuators for other applications are checked for accuracy prior to shipment ...

Page 19: ...RY DEATH OR SUBSTANTIAL PROPERTY DAMAGE DUE TO BOLT FAILURE NOTICE The calibration range of the DPU was carefully set at the factory The following procedure maintains the original factory bellows travel setting while the range spring change is performed This procedure must be strictly followed while changing the range spring assembly or altering the adjustment To replace the range spring assembly ...

Page 20: ...and tighten the retainer nuts 5 Using a spanner wrench rotate the spring adjustment until the pointer is set at exact zero Replace and tighten the lock nut The pointer must remain at thezerosetting If the pointer shifts from zero loosen the lock nut and repeat this step 6 Replace the low pressure housing and bolts new gaskets are recom mended Use the toque values listed in Tables 4 2 through 4 4 R...

Page 21: ...and move the spud for the required clearance After the lock nut is tightened return the spud to the original position Figure 4 2 Kickoff Spring Assembly NOTE The lock nut requires a modified 7 16 12 point box wrench for tight ening Figure 4 3 Figure 4 3 Wrench Modification 9 Check the back clearance between the kickoff spring and the slot Use a wire feeler gage or comparable measuring device The c...

Page 22: ...e bellows travel requires that the DPU be attached to the actuated instrument and connected to a test pressure source The procedure for this adjustment is presented in the manual of the actuated instrument 4 7 Bellows Unit Assembly BUA Replacement See Figure 2 1 WARNING High pressure Gas Installations with pressures greater than 200 psig HIGH PRESSURE GAS HAZARD ON DISASSEMBLY OF THE DPU TO PREVEN...

Page 23: ...adapter bracket screws 10 11 and remove the adapter bracket 13 5 Remove the three mounting bracket screws and remove the case mounting bracket 18 6 Remove the pressure housings bolts and pressure housings 26 7 Place the pressure housings 26 on the replacement bellows unit assembly 1 and insert and start only the pressure housing bolts 8 Attach the case mounting bracket 18 to the replacement assemb...

Page 24: ... to apply pressure slowly as torque is being applied to the connection through the torque tube drive shaft and not the torque tube itself With pointer at normal 0 torque tube rotation position max minimum scale position or 0 on a normal 0 to 100 scale unit adjust drive arm stop bracket or use alternate means to prevent pointer from moving stop bracket interferres with drive arm movement Note On re...

Page 25: ... level Density changes in process Refill reference leg media or reference leg with same density liquid as process media Piping from Pressure tap holes plugged Clean out piping Primary Element to DPU Bypass valve open or leaking Close bypass valve s or repair leaks Liquids or gases trapped Vent piping in piping Block or shutoff valves Open block or shut closed off valves Piping leaks HP side Repair...

Page 26: ...Loose links or movements Repair or replace Out of calibration Calibrate Erratic Primary Flow pulsating Install dampening Indication device upstream of DPU run Piping from Liquid trapped in gas Remove see Startup Primary Element piping or gas bubble in Procedure Section 3 to DPU liquid piping Vapor generator incorrectly Repipe installed Reference leg gassy or See piping instruc liquid vaporizing ti...

Page 27: ...SECTION 5 PARTS DRAWING LIST 5 1 General The parts list and parts identification drawing s for the DPU are presented in the separate DPU Manual Figure 5 1 199 DPU Parts Drawing 27 ...

Page 28: ... 0199 0191C 2 8 PLUG PIPE 1 2 NPT STEEL 0199 0192C 2 9 BOLT HOUSING STANDARD UNITS STAINLESS STEEL 1000 PSI UNITS STEEL 2500 3000 4500 PSI UNITS STUD ALLOY STEEL 1 2 20 X 7 FOR 6000 PSI UNITS NOT SHOWN BOLT FOR 6000 PSI UNITS NOT SHOWN 0199 1345C 0199 0085C 0199 1001C 0199 1346C A R 10 SCREW PIPE MOUNT ADAPTER 3 8 16 X 3 4 0210 0012J 1 11 SCREW SCH CAP STEEL 3 8 16 X 1 1 2 LG 0220 1102J 2 12 SCREW...

Page 29: ...7C 0199 0027C 0199 0184C 2 26 HOUSING PRESSURE SPECIFY 2 27 WASHER LOCK 3 8 USED WITH ITEMS 10 AND 11 0275 0049C 1 28 NOT USED 29 NUT 1 2 20 6000 3000 PSI MONEL UNITS USED WITH ITEM 9 0199 1002C A R 30 PLUG DAMPENER VALVE NOT SHOWN BD HD 1 4 28 X 1 4 SST 0199 0036C 1 31 NOT USED 32 WRENCH RANGE SPRING ADJUSTMENT 0199 0142C 1 33 KEYS SET OF HEX NOT SHOWN 0016 0013T 1 NOTES INDICATES RECOMMENDED SPA...

Page 30: ...SECTION 6 OUTLINE DIMENSION DRAWINGS Figure 6 1 199 DPU Dimension Drawing Part 1 of 2 30 ...

Page 31: ...50 8 2 9 64 54 4 6 3 000 20 7 FORGED STNL ST 316 1 2 NPT Note 1 1 4 NPT Note 1 Ø 7 177 8 2 50 8 2 9 64 54 4 12 4 500 31 0 FORGED ALLOY ST 4142 1 2 NPT Note 1 1 4 NPT Note 1 Ø 7 177 8 2 50 8 2 9 64 54 4 12 6 000 41 4 FORGED ALLOY ST 4142 FORGED STNL ST 17 4 PH 9 16 18 UNF Note 2 9 16 18 UNF Note 2 Ø 7 177 8 2 50 8 2 50 8 12 FORGED ALLOY ST 4142 FORGED STNL ST 17 4 PH 1 2 NPT Note 1 1 4 NPT Note 1 Ø...

Page 32: ... made by the manufacturer of that product and Cameron assumes no responsibility for the performance or reliability of the unit as a whole 3 In no event shall Cameron be liable for indirect incidental or consequential dam ages nor shall the liability of Cameron arising in connection with any products sold hereunder whether such liability arises from a claim based on contract warranty tort or otherw...

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