Instrumentation
Analyzer Pressure Regulation and
Vent Recovery System
Frank Ruiz, Ruiz & Associates
I F P A C S M - 2 0 0 1F i f t e e n t h I n t e r n a t i o n a l F o r u m
P r o c e s s A n a l y t i c a l C h e m i s t r y S M
J a n u a r y 2 1 - 2 4 , 2 0 0 1 ,A m e l i a I s l a n d , F l o r i d a , U . S . A
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
TopicsTopics CURRENT TECHNOLOGYCURRENT TECHNOLOGY
PROBLEMS CONTROLLING SAMPLE FLOW AND PROBLEMS CONTROLLING SAMPLE FLOW AND PRESSUREPRESSURE
PRESSURE REGULATORS AND FLOW PRESSURE REGULATORS AND FLOW CONTROLLERSCONTROLLERS
COMBINATION OF PRESSURE AND FLOW CONTROLCOMBINATION OF PRESSURE AND FLOW CONTROL
TEST RESULTSTEST RESULTS
SAMPLE SYSTEM WITH FLOW AND PRESSURE SAMPLE SYSTEM WITH FLOW AND PRESSURE REGULATIONREGULATION
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Typical Continuous Analyzer SystemTypical Continuous Analyzer System
PI PI0 100#
FLO
W ZERO
CALIBRATION
ANALYZER
BACKPRESSUREREGULATOR
FLOW ADJUST
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Typical Continuous Analyzer SystemTypical Continuous Analyzer System FLOW RATE CONTROLLEDFLOW RATE CONTROLLED
WITH A NEEDLE VALVEWITH A NEEDLE VALVE
FLOW RATE IS A FUNCTIONFLOW RATE IS A FUNCTION
OF OF P ACROSS VALVEP ACROSS VALVE
P VARIES WITH INLETP VARIES WITH INLET
PRESSURES CHANGESPRESSURES CHANGES
THEREFORE: FLOW VARIESTHEREFORE: FLOW VARIES
WITH INLET PRESSURE WITH INLET PRESSURE
CHANGESCHANGES
PI PI0 100#
FLOW
ZERO
CALIBRATION
ANALYZER
BACKPRESSUREREGULATOR
FLOW ADJUST
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
WHAT HAPPENS TO ANALYZER PRESSURE WHAT HAPPENS TO ANALYZER PRESSURE WHEN FLOW RATE VARIES?WHEN FLOW RATE VARIES?
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Control Pressure vs. FlowControl Pressure vs. Flow
Analyzer Function (Test 5- Constant Upstream Pressure / Downstream Vacuum)
11.30
11.40
11.50
11.60
11.70
11.80
11.90
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
Analyzer Flow (LPM)
An
aly
ze
r P
res
su
re (
PS
IA)
P2 / (PSIA)
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
How Can We Control Flow?How Can We Control Flow?
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Flow ControllersFlow Controllers
FLOW CONTROLLERWITH
UPSTREAM REFERENCE
FLOW CONTROLLERWITH
DOWNSTREAM STREAM REFERENCE
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Flow ControllersFlow Controllers FLOW CONTROLLERSFLOW CONTROLLERS
MAINTAIN A CONSTANT MAINTAIN A CONSTANT
PRESSURE DIFFERENTIAL PRESSURE DIFFERENTIAL
ACROSS A RESTRICTORACROSS A RESTRICTOR
ABILITY TO REFERENCE UPSTREAM OR DOWNSTREAM ABILITY TO REFERENCE UPSTREAM OR DOWNSTREAM PRESSUREPRESSURE
CONTROL VOLUMETRIC FLOW, CONTROL VOLUMETRIC FLOW, NOT MASS FLOW.NOT MASS FLOW.
IMPORTANT TO MAINTAIN A CONSTANT REFERENCE PRESSUREIMPORTANT TO MAINTAIN A CONSTANT REFERENCE PRESSURE
FLOW CONTROLLERWITH
UPSTREAM REFERENCE
FLOW CONTROLLERWITH
DOWNSTREAM STREAM REFERENCE
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
IF A PRESSURE REGULATOR IS USED TO MAINTAIN IF A PRESSURE REGULATOR IS USED TO MAINTAIN A CONSTANT REFERENCE PRESSURE TO THE A CONSTANT REFERENCE PRESSURE TO THE FLOW CONTROLLER, THE FLOW WILL REMAIN FLOW CONTROLLER, THE FLOW WILL REMAIN
CONSTANT.CONSTANT.
IF A FLOW CONTROLLER IS USED TO MAINTAIN A IF A FLOW CONTROLLER IS USED TO MAINTAIN A CONSTANT FLOW THROUGH THE PRESURE CONSTANT FLOW THROUGH THE PRESURE
REGULATOR, THE REGULATED PRESSURE WILL REGULATOR, THE REGULATED PRESSURE WILL REMAIN CONSTANT.REMAIN CONSTANT.
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Combining Pressure and Flow ControlCombining Pressure and Flow Control
FLOW CONTROLLERWITH
UPSTREAM REFERENCE
FLOW CONTROLLERWITH
DOWNSTREAM STREAM REFERENCE
ANALYZER
ANALYZER
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Test SetupTest Setup
FLOW CONTROLLERWITH
UPSTREAM REFERENCE
ANALYZER
FLOW CONTROLLERWITH
UPSTREAM REFERENCE
ANALYZER
VACUUM PUMP
VARY SUPPLYPRESSURE
VARY OUTLETPRESSURE
N2
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Test ObjectivesTest Objectives TEST PRESSURE AND FLOW STABILITY BY TEST PRESSURE AND FLOW STABILITY BY
VARYING SUPPLY PRESSURE FROM 15 TO 90 PSIG VARYING SUPPLY PRESSURE FROM 15 TO 90 PSIG WHILE KEEPING THE OUTLET PRESSURE WHILE KEEPING THE OUTLET PRESSURE CONSTANTCONSTANT
TEST STABILITY BY VARYING THE OUTLET TEST STABILITY BY VARYING THE OUTLET PRESSURE FROM 0 TO 30” Hg WHILE KEEPING PRESSURE FROM 0 TO 30” Hg WHILE KEEPING THE SUPPLY PRESSURE CONSTANTTHE SUPPLY PRESSURE CONSTANT
THE FLOW RATE WILL BE 1 LPM FOR ALL TESTSTHE FLOW RATE WILL BE 1 LPM FOR ALL TESTS
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Pressure Control Test #1Pressure Control Test #1 ANALYZERANALYZER
PRESSURE SET PRESSURE SET
@ 5 PSIG @ 5 PSIG
SUPPLY PRESSURE SUPPLY PRESSURE
VARIED 20 TO VARIED 20 TO
90 PSIG90 PSIG
-1
0
1
2
3
4
5
6
20 30 40 50 60 70 80 90
Inlet to IR4000 PSIG
PS
IG, L
PM
ANALYZER PRESS
Flow
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Pressure Control Test #2Pressure Control Test #2 ANALYZERANALYZER
PRESSURE SET PRESSURE SET
@ 20.5 PSIG @ 20.5 PSIG
SUPPLY PRESSURESUPPLY PRESSURE
VARIED 30 TOVARIED 30 TO
90 PSIG90 PSIG
0
5
10
15
20
30 40 50 60 70 80 90
Inlet to IR4000 PSIG
PS
IG, L
PM
ANALYZER PRESS.
Flow
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Pressure Control Test #3Pressure Control Test #3 ANALYZERANALYZER
PRESSURE SET PRESSURE SET
@ 30 PSIG@ 30 PSIG
SUPPLY PRESSURESUPPLY PRESSURE
SET @ 50 PSIGSET @ 50 PSIG
OUTLET PRESSURE OUTLET PRESSURE
VARIED 0 TO 30 PSIGVARIED 0 TO 30 PSIG
-10
0
10
20
30
40
50
60
0 5 10 15 20 25 27 28 29 30
Back Pressure PSIG
PS
IG, L
PM SUPPLY
ANALYZER
Flow
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Pressure Control Test #4Pressure Control Test #4 ANALYZERANALYZER
PRESSURE SET PRESSURE SET
@ 12.7 PSIA@ 12.7 PSIA
SUPPLY PRESSURESUPPLY PRESSURE
SET @ ATMOSPHERICSET @ ATMOSPHERIC
OUTLET PRESSURE OUTLET PRESSURE
VARIED 1 TO 11 PSIAVARIED 1 TO 11 PSIA
0
2
4
6
8
10
12
14
Downstream Pressure PSIA
PS
IA, L
PM SUPPLY (PSIA)
ANALYZER(PSIA)
Flow
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
CONCLUSIONCONCLUSION
The flow and pressure were held very steady with the combination of The flow and pressure were held very steady with the combination of Flow and Pressure RegulatorsFlow and Pressure Regulators
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
EVEN BETTER REGULATION IS ACHIEVED BY EVEN BETTER REGULATION IS ACHIEVED BY OPTIMIZING THE REGULATOR CONTROL RANGE OPTIMIZING THE REGULATOR CONTROL RANGE AND CvAND Cv
-15 -10 -5 0 5 10 15 20 25 30
NPR-4000
IR-4000
IR-4001
CONTROL RANGE PSIG
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Example SystemExample System
PROCESS LINE
ANALYZER
1/4 " TUBE100 FEET
Veriflo SC-423XL-SSFlow Controller
PUMP
By-Pass Flow
AnalyzerSample Flow
30 0in Hg
VENT RECOVERY HEADER
Fig. 1
IR-4001
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Continuous Analyzer Sample SystemContinuous Analyzer Sample System
ANALYZER
AIR
FLOWCONTROLLER
ZERO
PARKERSTREAM SWITCH
R-max
PI
PI
SAMPLE INLET
SAMPLE RETURN
RELIEF VENT
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Analyzer Pressure Regulation & Analyzer Pressure Regulation & Vent Recovery SystemVent Recovery System
Thank you!Thank you!
Questions?Questions?