Thank You for Attending Today’s Webinar - Lesman · LumaStar EPL-100 LED Illuminator. Features:...
Transcript of Thank You for Attending Today’s Webinar - Lesman · LumaStar EPL-100 LED Illuminator. Features:...
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Instruments, Valves, and Controls
Thank You for Attending Today’s Webinar:
Glass Level Gages 101
Your HostMike DeLacluysePresidentLesman Instrument [email protected]
Featured SpeakerRob BolinProduct Manager Jerguson (Clark-Reliance)[email protected]
Follow the Conversation LIVE@Lesman_Inst #LesmanWebinar
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Level Gage & Valve Maintenance Training
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Why Use a Gage Glass?When systems fail…….”seeing is believing”
Even the most advanced fly-by-wire aircraft in the world have windows, would you fly blind?
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Why Use a Gage Glass?• Level Verification
• Start-Up• Operations Confirmation• Upset Condition• Plant Emergency
• Instrument Calibration• “Safety Valve” of Level
Measurement
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Gage Types• Reflex Glass
– Molded Prisms on One Side
– 1 piece of Glass per gage section
– Clean Service– Higher Pressure
Ratings– Economical Advantage– Silver / Black
Indication
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Reflex Gage Components
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Gage Types• Transparent Glass
– Glass is Flat, Ground & Polished on both sides
– 2 pieces of Glass per gage section
– May add shields– Allows User to See
Fluid Characteristics– Used for Interface
Applications
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Transparent Gage Components
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Glass Materials• Borosilicate
– Up to 600°F (315°C)– Up to 300 WSP– Over 300 WSP, Mica
Protected Transparent• HP Borosilicate
– Up to 600°F (315°C)– Higher Tolerances
• Aluminosilicate– Up to 800°F (426°C)
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Glass Sizes – Industry Std (34mm)• Size 1 thru 9
Size Length Typical Visible Range1 4‐1/2'' (115mm) 3‐3/4'' (95mm)2 5‐1/2'' (140mm) 4‐3/4'' (121mm)3 6‐1/2'' (165mm) 5‐3/4'' (146mm)4 7‐1/2'' (190mm) 6‐3/4'' (171mm)5 8‐5/8'' (220mm) 7‐7/8'' (200mm)6 9‐7/8'' (250mm) 9‐1/8'' (232mm)7 11'' (280mm) 10‐1/4'' (260mm)8 12‐5/8'' (320mm) 11‐7/8'' (302mm)9 13‐3/8'' (340mm) 12‐5/8'' (321mm)
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Gasket MaterialsSeal vs. Cushion Gasket– Seal Gasket is wetted &
must be compatible with the process conditions
– Cushion Gasket prevents metal-to-glass contact
– Cushion is IFG-5500 Material as Standard
• Many Customers Upgrade to Grafoil to Match Seal Gasket
– This eliminates the potential for errors during repairs
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Gage Lengths• Two methods to vary gage
length:• Change glass size• Add more sections
• Multiple Sections ALWAYS on one chamber
• Do not use pipe nipples to join multiple single section gages –this will result in failure!
(1) Section Gage
(3) Section Gage
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Jerguson Safety Ball Check Valves
• Also known as:– Automatic Shutoff Valve– Excess Flow Valve
• All 90-degree valves• Must be installed horizontal• Uses kinetic energy of fluid to
activate ball check• Engage at ~5 psi-differential
pressure
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Importance of Ball Check Valves• In the unlikely event of gasket
failure or glass breakage the pressure differential will cause the ball check to seat preventing gas/fluid from further leakage
• Minimizes the potential for physical injury, or loss of product
• Provides a means to isolate the gage from service
If properly maintained, a glass gage will provide reliable service.
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CommissioningSafety Ball Check Valves
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Ball Check Valve Operation• Partially open valves
prevent the ball check from seating
• Rapid opening of isolation valves can cause glass breakage • Valves should be
periodically inspected for build up which can prevent the ball check from seating properly
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Gage Inspection• Gages should be routinely
inspected for signs of wear:• Cloudy glass• Cracks or fractures • Pitted chambers / gasket surface• Excessive deterioration or rust
• Bolts torque is vital in ensuring proper operation of the gage • Gage should be isolated and
torques inspected periodically• Gaskets can relax over a period of
time and cause loss of torque
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Gage Glass & Mica Shields• Mica shields protect
transparent gages in steam service
• Glass can become steam etched which can lead to potential catastrophic failures
• High quality mica enables you to see the fluid more clearly
• Proper blowdown procedure is critical in determining life of a mica shield
• Excessive condensate formation results in reduced life of mica shield
Steam etching
High Quality Mica
Low Quality Mica
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Step 1Isolate gage from service, relieve internal
pressure and drain.
Disassembly
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Step 2Loosen end bolts first, then work towards the center,
alternating from top to bottom and following the
sequence for tightening in reverse.
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Step 3Removal and disposal of
componentsNever re-use gaskets or glass!
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Step 4Clean Chamber
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Step 5 Thorough Inspection
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Step 6Thoroughly inspect chamber gasket surface seating area. Remove any pitting damage, steam cuts, gouges, or scars on a milling
machine. The minimum dimension shown in Figure A must be maintained.
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Recessed Gasket Surface
No Recess Recessed
• Provides positive location of the seal gasket during both assembly and field repair
• Makes it possible to repair a Jerguson gage while it is mounted to a vessel
• Safety feature in the fact that it contains the gasket and helps prevent lateral movement which could lead to a gasket blow-out
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Reflex Gage Assembly
• Place seal gasket on recessed surface of chamber, and cushion gasket on cover
• Lay glass prism side up on top of the cover cushion gasket
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• Place chamber on top of reflex glass.
• Insert U-Bolts around chamber into the holes along the back of the cover, and carefully roll chamber over.
! Ensure gasket stays aligned throughout the process !
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• Finger tighten the nuts onto the U-Bolts. Ensure bearing face of nut is against the cover
• Working from the middle set of nuts alternate outward with torque wrench in 5-ft-lb increments.
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Transparent Gage Assembly • Lay back cover face up on
the table and insert T-Bolts into holes
• Flip the back cover over like shown
• Place seal gasket on recessed surface of chamber, cushion gasket on recessed surfaces of covers
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• Place transparent glass on the cover
• Place the chamber on top of the glass
• Place the second set of glass on top of the chamber
• Place front cover on top of T-Bolts
! Ensure gasket stays aligned throughout the process !
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• Finger tighten the nuts onto the T-Bolts. Ensure bearing face of nut is against the cover
• Working from the middle set of nuts alternate outward with torque wrench in 5-ft-lb increments. You will need to hold a wrench on the hex head for to prevent the nut from spinning.
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Glass Gage Maintenance
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LumaStar EPL-100 LED Illuminator
Features:• Cover up to 4 Sz. 9 Sections
with One Illuminator• LED’s have 10 year nominal
life rating• Easy clamp-on Installation• Maintenance Free – No bulb
changes• No Heat Generation• Fits Variety of Gages
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Safe+View• Personnel Protection
from glass failure• Impact Resistant• High Temperature or
Caustic Service• Fits Jerguson and other
gage glasses• Field Installable
• No disassembly required!
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Questions?
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Instruments, Valves, and Controls
Upcoming Webinar:
Webinar invitation e-mail coming soon…
What topics would you like us to cover?
• Pressure• Temperature• Level• Flow• Combustion• Process Valving
• Industrial Wireless
• Communications• Control Systems• Data Acquisition
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Instruments, Valves, and Controls
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