Liquid Level Gages & Valves FACTORY TRAINING GLASS-TRAC Liquid Level Gages & Valves 1960’s to 2001 Since 2001

QUEST-TEC JERGUSON PENBERTHY PRODUCT LINE STRENGTH POTTING COMPOUND ▀ LOW ▀ MEDIUM ▀ HP - 1-9/16” CHAMBER - RECESSED GASKET SEAT - INDUSTRY STD GLASS SZ - LED ILLUMINATOR - ALL SA-105 FORGED STEEL COVERS JERGUSON - - - - - - - - - ▀ MEDIUM (20 SERIES) ▀ HP (32 SERIES) - 1-9/16” CHAMBER - RECESSED GASKET SEAT - INDUSTRY STD GLASS SZ - LED ILLUMINATOR - NON STANDARD GLASS SIZE FOR LOW PRESSURE SERIES, 300L (SIZE 11 THRU 20 ) PENBERTHY ▀ LOW ▀ MEDIUM ▀ HP - 1-3/8” CHAMBER - NO GASKET SEAT - INDUSTRY STD GLASS SZ - BULB ILLUMINATOR POTTING COMPOUND

USERS MARKETS/APPLICATIONS WHAT TYPE OF FACILITIES AND CUSTOMERS BUY SIGHT GLASS? ▀ CRUDE OIL REFINING ▀ CHEMICAL PLANTS ▀ NATURAL GAS PROCESSING PLANTS ▀ NATURAL GAS COMPRESSOR STATIONS ▀ OEM FABRICATORS ▀ PULP & PAPER MANUFACTURING PLANTS ▀ MINING, MATERIAL PROCESSING ▀ ENGINEERING THAT SUPPORT THESE MARKETS

USERS MARKETS/APPLICATIONS CRUDE OIL REFINING & PETROCHEMICAL PLANTS ▀ PLANT EXPANSIONS ▀ TURNAROUNDS ▀ DEBOTTLENECKING ▀ LOW EMISSION UPGRADES ▀ EMERGENCY REPLACEMENTS ▀ REPAIR WORK ▀ REPLACEMENTS

USERS MARKETS/APPLICATIONS OEM FABRICATORS ING COMPOUND ▀ SEPARATOR SYSTEMS, PRODUCTION EQUIPMENT ▀ WATER PROCESSING, TREATMENT SYSTEMS ▀ GAS COMPRESSION SKIDS, GAS PROCESSING UNITS (GPU’s) ▀ MODULAR GAS PLANTS ▀ CHEMICAL INJECTION SKIDS ▀ OIL & GAS REFINING & PROCESS SYSTEMS ING COMPOUND

NATURAL GAS DELIVERY NETWORK MARKETS/APPLICATIONS

CRUDE OIL DELIVERY NETWORK MARKETS/APPLICATIONS POTTING COMPOUND

INTRODUCTION What is a sight glass? It is a transparent tube or window through which the level of liquid in a vessel can be checked visually.

What advantages does a sight glass have? INTRODUCTION What advantages does a sight glass have? ▀ Direct reading. ▀ No calibration. ▀ No power required. ▀ Suitable for fluctuation in specific gravity. ▀ 100% accuracy. ▀ Cost efficient level measurement. What are the different types of sight glass?

What types of sight glass are there? GAUGE TYPES What types of sight glass are there? ▀ Reflex ▀ Transparent ▀ Tubular ▀ Weld Pad ▀ Large Chamber Reflex / Transparent Tubular Weld Pad Large Chamber

What types of sight glass are there? GAUGE TYPES What types of sight glass are there? ▀ Reflex ▀ Transparent ▀ Tubular ▀ Weld Pad ▀ Large Chamber Transparent Low Medium High Reflex Low Medium High 500 to 1000 PSI 1000 to 2500 PSI 3000 PSI 1800 to 2400 PSI 3000 to 2250 PSI 4000 PSI

It’s all about the glass! MATERIALS It’s all about the glass! Borosilicate is a type of glass with silica and boron trioxide as the main glass forming ingredients. Tempered glass is about four times stronger than "ordinary," or annealed, glass. .6875” (17.5mm) Which one is Transparent? 1.3125” (34mm)

GAUGE TYPES Transparent Reflex Prism Molded Glass Higher Pressure Ratings Less Cost vs. Transparent All liquids appear black - Not applicable for liquid/liquid interface Ideal for clear liquids Clear See-Thru Glass Lower Pressure Ratings Allows Operator To View Liquid Color Required for Liquid/Liquid Interface Allows a Backlight LED Illuminator

MATERIALS

TEMPERATURE CONSIDERATIONS MATERIALS STANDARD: TEMPERED BOROSILICATE OPTIONAL: TEMPERED ALUMINOSILICATE TEMPERATURE CONSIDERATIONS GLASS MATERIAL MAX. TEMP. BOROSILICATE 600 F ALUMINOSILICATE 800 F QUARTZ 1000 F ▀ TRANSPARENT ▀ REFLEX

GLASS, STANDARD DIMENSIONS SPECIFICATION Where do I find glass dimensions? Catalog Page 24

GLASS, STANDARD DIMENSIONS SPECIFICATION Where do I determine glass size? VISIBLE PER SECTION ▀ Industry standard glass is interchangeable ▀ If non-standard “oddball” glass size is discovered best practice is to replace with industry standard size

GASKETS & CUSHIONS OPTIONAL MATERIAL INDUSTRY STD SIZE 1 THRU 9 STANDARD: GARLOCK IFG 5500 INDUSTRY STD SIZE 1 THRU 9 OPTIONAL MATERIAL MATERIAL TYPE GRAFOIL GHR TEFLON (GLASS FILLED) GYLON 3510

SPECIFICATION GASKETS & CUSHIONS OPTIONAL MATERIAL A-194 2H NUTS STANDARD: A-193 B7 STUDS / CAP SCREWS A-194 2H NUTS ASTM MIN. TEMP RATING: -55 F OPTIONAL MATERIAL MATERIAL TYPE B8M 316 SST M GRADE

MODELS Glass Size 1 thru 9 No. of Sections 1 and up Glass Type Transparent ▀ Carbon Steel, LTCS, 316 Stainless. ▀ Other material per request. ▀ 500 PSI to 3000 PSI for Low/Medium/HP series. ▀ LED Illuminator option. ▀ Lower pressure rating vs. Reflex. ▀ Observe process fluid color 91-TL Glass Size 1 thru 9 No. of Sections 1 and up Glass Type Reflex or Transparent Pressure Series

Transparent Design Details MODELS Transparent Design Details ▀ Transparent glass allows use of a shield. ▀ PCTFE or Mica. ▀ Suitable for liquid/liquid interface. Why use a shield?

MODELS Gage Shields ▀ Protects the glass from process fluid/vapor. ▀ Hydrofluoric Acid ▀ Concentrated Phosphoric Acid ▀ Strong Alkali ▀ Medium to HP Steam

VAPOR OIL WATER MODELS Liquid / Liquid Interface ▀ Golden rule to liquid/liquid interface. ▀ Minimum one process connection per phase. ▀ Transparent gage with illuminator. ▀ White LED with clear LED cover. VAPOR OIL WATER

MODELS Glass Size 1 thru 9 No. of Sections 1 and up Glass Type Reflex ▀ Carbon Steel, LTCS, 316 Stainless. ▀ Other material per request. ▀ 1800 PSI to 4000 PSI for Low/Medium/HP series. ▀ No back light Illuminator option. ▀ Higher pressure rating vs. Transparent. ▀ High visual contrast between clear water / clear liquid. 94-RM Glass Size 1 thru 9 No. of Sections 1 and up Glass Type Reflex or Transparent Pressure Series

Success Stories Lone Star – Enterprise Products 5 Trains with 100K Magnetics and 470K+ Level Gages

MINIMUM TEMPERATURE RATINGS, CHAMBER/COVERS LOW TEMPERATURE SERVICE SPECIFICATION MINIMUM TEMPERATURE RATINGS, CHAMBER/COVERS LIQUID PROPANE REFRIGERATION SYSTEMS NATURAL GAS PROCESSING PLANTS MATERIAL MIN. TEMP. CARBON STEEL -20 F LOW TEMP CARBON STEEL -50 F 316 SST BELOW -50 F

TEMPERATURE RATINGS, LOW END LOW TEMPERATURE SERVICE SPECIFICATION TEMPERATURE RATINGS, LOW END PART MATERIAL GASKETS GRAFOIL NON-FROST EXTENSION 1-5/8" - 5-5/8" ' PMMA (LUCITE) CHAMBER/COVER/VALVE LTCS or 316 SST BOLTING STD or 316 SST

QUEST-TEC PENBERTHY JERGUSON GAUGE COVER SPECIFICATION STANDARD: A-105 DROP FORGED STEEL (NO IRON CASTINGS, PENBERTHY) L SERIES: STANDARD SIDES M/H: SHROUDED SIDES OPTIONAL MATERIAL: 316, HASTELLOY C, DUPLEX SST MONEL, OTHER QUEST-TEC PENBERTHY JERGUSON SPECIFICATION INFLUENCE… QUEST-TEC IS THE ONLY USA MFG OFFERING A LOW PRESSURE SERIES USING FORGED SA-105 STEEL COVERS JERGUSON: ASTM A36 STRUCTURAL STEEL (300L) PENBERTHY: CAST DUCTILE IRON

GASKETS AND CUSHIONS SPECIFICATION WETTED PARTS NON-WETTED PARTS CHAMBER BOLTING CONNECTION NIPPLE (SCH.80) COVER VALVE BODY / TAIL PIECE VALVE UNION NUTS VALVE TRIM HAND WHEEL/NUT GAGE MATERIAL CAN BE SPECIFIED BASED ON: TEMPERATURE RATINGS FLUID COMPATIBILITY CORROSION RESISTANCE 4) OTHER CUSTOMER PREFERENCE/STANDARDS

VALVE DETAILS SPECIFICATION VALVE BODY FORGED STEEL, STD MATERIAL: CARBON STL OPTIONAL: 316, HASTELLOY C, MONEL, OTHER VALVE TRIM SEAT / STEM / BALL CHECK STD MATERIAL: 416 SST, OPTIONAL 316, HASTELLOY C, MONEL, OTHER VALVE PACKING STD MATERIAL: TFE TEMP: 450 F MAX OPTIONAL: GRAFOIL TEMP: 800 F MAX UNION NUTS / PACKING NUTS EXTERIOR NON-WETTED STD MATERIAL: CARBON STEEL, OPTIONAL 316, HASTELLOY C, MONEL, OTHER

VALVE DETAILS SPECIFICATION VALVE MODELS 1S INTEGRAL BONNET, SCREWED GAGE 2S UNION BONNET, SCREWED GAGE 1U INTEGRAL SEAT, UNION GAGE 2U UNION BONNET, UNION GAGE ALL TYPE 2, 4, 3, 4, 5, 7 HAVE REMOVABLE 416 SST SEAT ALL TYPE 1 VALVES HAVE A SEAT INTEGRAL TO THE VALVE BODY MATERIAL

VALVE DETAILS SPECIFICATION BALL CHECK

INSTALLATION, START-UP TECHNICAL DETAILS AFTER MOUNTING, INSTALLING, RETORQUE… ▀ THE GAGE GLASS SHOULD BE BROUGHT INTO SERVICE SLOWLY. TO AVOID EXCESSIVE THERMAL SHOCK OR MECHANICAL STRESS ON THE GLASS OR CHAMBERS, THE CONNECTING OR BLOCK VALVES MUST OPEN SLIGHTLY. THE GAGE TEMPERATURE AND PRESSURE ARE THEN ALLOWED TO SLOWLY EQUALIZE WITH THE VESSEL. ▀ THE GAGE VALVES SHOULD BE PARTIALLY OPENED BY 1/2” TURN TO PREVENT THE BALL CHECK FROM CHECKING AT THE SEAT. THIS WILL ALLOW THE GAGE GLASS TO FILL WITH LIQUID. UPON READINESS, THE VALVE MUST BE FULLY OPENED TO ACTIVATE THE AUTOMATIC BALL CHECKS. POTTING COMPOUND

VALVE DETAILS Offset Pattern vs. Straight Pattern ▀ Offset allows unobstructed path to clean gage inside. ▀ Valve stem interferes on straight pattern.

VALVE DETAILS SPECIFICATION

VALVE DETAILS SPECIFICATION

VALVE DETAILS SPECIFICATION SAMPLE SPECIFICATION: VESSEL CONNECTION : 3/4“ M.NPT UNION x GAGE CONNECTION : 1/2“ F.NPT NON-UNION VENT/DRAIN CONNECTION : 1/2“ F.NPT CONDENSED: 3/4“ x 1/2“ x 1/2"

SAMPLE SPECIFICATION: VALVE DETAILS SPECIFICATION SAMPLE SPECIFICATION: VESSEL CONNECTION : 1-1/2” 300# RF WN SCH.160 FLANGE x GAGE CONNECTION : 1/2“ SW VENT/DRAIN CONNECTION : 1/2“ SW

GAGE CONNECTIONS SIDE CONNECTED END CONNECTED VENT GAGE CONNECTION (TOP & BOTTOM) GAGE CONNECTION (TOP & BOTTOM) DRAIN

GAUGE CONNECTIONS

STANDARD VIEWING ANGLE SPECIFICATION ▀ PLAN VIEW ORIENTATION ▀ STARTS AT 0 (VESSEL) ▀ ROTATE CLOCKWISE

STANDARD VIEWING ANGLE SPECIFICATION

VIEWING ANGLE SPECIFICATION 270 EXAMPLE

STANDARD VIEWING ANGLE SPECIFICATION 90 EXAMPLE

FEATURES, ADVANTAGES, BENEFITS LED ILLUMINATOR FEATURES, ADVANTAGES, BENEFITS SLI SERIES, STANDARD FEATURES ▀ NEMA 4X & 8 POWER SUPPLY ▀ CL.1 DIV. 1 RATED ▀ WEATHER PROOF, WATER TIGHT ▀ WRAP AROUND LANYARD MOUNTING TO GAGE ▀ BRIGHT GREEN, HIGH INTENSITY LED’S POTTING COMPOUND

LED ILLUMINATOR FEATURES, ADVANTAGES, BENEFITS POTTING COMPOUND

FEATURES, ADVANTAGES, BENEFITS SPECIALTY GAUGES FEATURES, ADVANTAGES, BENEFITS ▀ LARGE INTERNAL VOLUME ▀ ALLOWS LEVEL MEASUREMENT OF LIQUIDS THAT COULD FLASH AT CERTAIN TEMPERATURES IN DIRTY SERVICE POTTING COMPOUND

FEATURES, ADVANTAGES, BENEFITS SPECIALTY GAUGES FEATURES, ADVANTAGES, BENEFITS ▀ LARGE CHAMBER ▀ OPTION FOR FULL BORE, WITHOUT VALVES ▀ SPECIFY 2-1/8” BORE APPLICATIONS: FLASHING SERVICE LIQUID PROPANE POTTING COMPOUND

FEATURES, ADVANTAGES, BENEFITS SPECIALTY GAUGES FEATURES, ADVANTAGES, BENEFITS APPLICATION: LPG LIQUID PROPANE ALL 316 SST NON-FROST EXTENSIONS INSULATION JACKET $8,000.00 Each POTTING COMPOUND

SPECIALTY GAUGES FEATURES, ADVANTAGES, BENEFITS POTTING COMPOUND

QUEST-TEC JERGUSON PENBERTHY PRODUCT LINE STRENGTH FEATURES, ADVANTAGES, BENEFITS QUEST-TEC ▀ LOW ▀ MEDIUM ▀ HP - 1-9/16” CHAMBER - RECESSED GASKET SEAT - INDUSTRY STD GLASS SZ - LED ILLUMINATOR - ALL SA-105 FORGED STEEL COVERS JERGUSON - - - - - - - - - ▀ MEDIUM (20 SERIES) ▀ HP (32 SERIES) - 1-9/16” CHAMBER - RECESSED GASKET SEAT - INDUSTRY STD GLASS SZ - LED ILLUMINATOR - NON STANDARD GLASS SIZE FOR LOW PRESSURE SERIES, 300L (SIZE 11 THRU 20 ) PENBERTHY ▀ LOW ▀ MEDIUM ▀ HP - 1-3/8” CHAMBER - NO GASKET SEAT - INDUSTRY STD GLASS SZ - BULB ILLUMINATOR POTTING COMPOUND

RECESSED GASKET SEAT MACHINING FEATURES, ADVANTAGES, BENEFITS QUEST-TEC PENBERTHY POTTING COMPOUND

QUEST-TEC PENBERTHY JERGUSON 300L CHAMBER COMPARISON FEATURES, ADVANTAGES, BENEFITS QUEST-TEC PENBERTHY JERGUSON 300L POTTING COMPOUND WALL THICKNESS

PENBERTHY QUEST-TEC CHAMBER COMPARISON FEATURES, ADVANTAGES, BENEFITS POTTING COMPOUND HIGH STRESS, WEAK POINT HIGH STRESS, PROPER THICKNESS

LOW EMISSION VALVES FEATURES , ADVANTAGES, BENEFITS API 624 1st EDITION FEB. 2014 Type Testing of Rising Stem Valves Equipped with Flexible Graphite Packing for Fugitive Emissions. The standard specifies the requirements and acceptance criteria (100 ppmv) for fugitive emission type testing of rising and rising-rotating stem valves equipped with packing previously tested in accordance with API Standard 622.

LOW EMISSION VALVES FEATURES, ADVANTAGES, BENEFITS   API 624 CERTIFIED LOW LEAKAGE VALVE MODELS All Type 3 Models Type 2 Pending TYPE 3 LEAKAGE RESULTS STATIC: 2ppmv (highest recording) DYNAMIC: 3ppmv (highest recording) TEADIT 2236 PACKING Previously tested to API 622 Graphite Packing

LOW EMISSION VALVES API 624 1st EDITION FEB. 2014 Type Testing of Rising Stem Valves Equipped with Flexible Graphite Packing for Fugitive Emissions. The standard specifies the requirements and acceptance criteria (100 ppmv) for fugitive emission type testing of rising and rising-rotating stem valves equipped with packing previously tested in accordance with API Standard 622.

LOW EMISSION VALVES TYPE 3 LEAKAGE RESULTS TEADIT 2236 PACKING STATIC: 2ppmv (highest recording) DYNAMIC: 3ppmv (highest recording) TEADIT 2236 PACKING Previously tested to API 622 Graphite Packing API 624 CERTIFIED LOW LEAKAGE GAGE VALVE Model: 3A-S-LE

LOW EMISSION VALVES FEATURES, ADVANTAGES, BENEFITS TEADIT 2236 PACKING

THREADED, & UNION EXAMPLE LOW-E VALVE + ALL WELDED FEATURES, ADVANTAGES, BENEFITS ALL WELDED ASSEMBLY ▀ No threaded connections ▀ No union fittings ▀ SW x NPT vent/drain gate valves ▀ Hydrotest after final assembly ▀ All NDE testing completed prior to final assembly ▀ Piping per site specifications ▀ Vent/Drain valves per site specification ▀ Gage valves per site specification ▀ Material origins per site specification ▀ Complete document package GAGE CONN THREADED, & UNION EXAMPLE

THREADED, & UNION EXAMPLE LOW-E VALVE + ALL WELDED FEATURES, ADVANTAGES, BENEFITS NUISANCE LEAK POINTS GAGE CONN THREADED, & UNION EXAMPLE

WELDING, CUSTOM ASSEMBLIES CAPABILITIES

WELDING, CUSTOM ASSEMBLIES CAPABILITIES

WELDING, CUSTOM ASSEMBLIES CAPABILITIES ▀ FULL SCALE FABRICATION ABILITIES ▀ IN-HOUSE PWHT, PT, VT, HB ▀ PMI, RT, UT, OTHER TESTING AVAILABLE ▀ DETAILED APPROVAL DRAWINGS ▀ THOROUGH WELD PROCEDURES, QUALIFICATION DOCUMENTS ▀ STANDARD & EXOTIC ALLOYS ▀ ESTABLISHED QA QC TO API ISO 9001 STANDARDS

93RM 39R-20 3RM9 QUEST-TEC JERGUSON PENBERTHY GAUGE MODELS MODEL CROSSOVER QUEST-TEC 93RM JERGUSON 39R-20 PENBERTHY 3RM9 SIZE 9 3 SECTIONS REFLEX MEDIUM PRESSURE

INSTALLATION, START-UP TECHNICAL DETAILS POTTING COMPOUND ▀ ALL PROCESS GAGES SHIP WITH A TORQUE TAG

INSTALLATION, START-UP TECHNICAL DETAILS AFTER MOUNTING, INSTALLING, RETORQUE… ▀ THE GAGE GLASS SHOULD BE BROUGHT INTO SERVICE SLOWLY. TO AVOID EXCESSIVE THERMAL SHOCK OR MECHANICAL STRESS ON THE GLASS OR CHAMBERS, THE CONNECTING OR BLOCK VALVES MUST OPEN SLIGHTLY. THE GAGE TEMPERATURE AND PRESSURE ARE THEN ALLOWED TO SLOWLY EQUALIZE WITH THE VESSEL. ▀ THE GAGE VALVES SHOULD BE PARTIALLY OPENED BY 1/2” TURN TO PREVENT THE BALL CHECK FROM CHECKING AT THE SEAT. THIS WILL ALLOW THE GAGE GLASS TO FILL WITH LIQUID. UPON READINESS, THE VALVE MUST BE FULLY OPENED TO ACTIVATE THE AUTOMATIC BALL CHECKS. POTTING COMPOUND

INSTALLATION, START-UP TECHNICAL DETAILS POTTING COMPOUND

INSTALLATION, START-UP TECHNICAL DETAILS POTTING COMPOUND

SUMMARY WHAT MAKES QTS DIFFERENT… ▀ OUR COMMITMENT TO PROVIDE QUALITY EQUIPMENT, AND TO SATISFY CUSTOMER REQUIREMENTS ▀ QTS IS AN INDEPENDENTLY OWNED COMPANY SOLELY FOCUSED ON LIQUID LEVEL MEASUREMENT EQUIPMENT ▀ UPPER MANAGEMENT AT QTS HAS EXTENSIVE LEVEL GAGE INDUSTRY EXPERIENCE ▀ QTS PRODUCT OFFERING COVERS A WIDE RANGE OF LIQUID LEVEL MEASUREMENT PRODUCTS. POTTING COMPOUND

Group Exercises

SIZING GAUGE GLASS SPECIFICATION BASIC METHODS 1) SELECT SIZE BASED ON: - VESSEL C-C - CHAMBER CONNECTION TYPE - VALVE MODEL 2) SELECT SIZE BASED ON: - VISIBLE RANGE

SIZING SIGHT GLASS WITH VISIBLE RANGE GLASS-TRAC LIQUID LEVEL GAGES & VALVES SIZING SIGHT GLASS WITH VISIBLE RANGE END CONNECT SLIDE TO 40-7/8” …GAGE SIZE 93 1/2“ NPT 1S VALVE MODEL DROP DOWN TO APPROPRIATE COLUMN EXAMPLE USING 40.00” VISIBLE RANGE or “VISIBLE GLASS” WHAT IS THE MINIMUM C-C?

93TM SIZING SIGHT GLASS WITH VISIBLE RANGE ROUND UP? GLASS-TRAC LIQUID LEVEL GAGES & VALVES SIZING SIGHT GLASS WITH VISIBLE RANGE END CONNECT SLIDE TO 40-7/8” …GAGE SIZE 93 1/2“ NPT 1S VALVE MODEL DROP DOWN COLUMN: 45-5/8” EXAMPLE USING 40.00” VISIBLE RANGE or “VISIBLE GLASS” 93TM MIN C-C: 45-5/8” VISIBLE RANGE: 40-7/8” ROUND UP? WHAT IF 45-5/8” IS TOO LONG?

93TM 93TM-CH SIZING SIGHT GLASS WITH VISIBLE RANGE GLASS-TRAC LIQUID LEVEL GAGES & VALVES SIZING SIGHT GLASS WITH VISIBLE RANGE END CONNECT SLIDE TO 40-7/8” …GAGE SIZE 93 1/2“ NPT 1S VALVE MODEL DROP DOWN COLUMN: 45-5/8” EXAMPLE USING 40.00” VISIBLE RANGE or “VISIBLE GLASS” 93TM MIN C-C: 45-5/8” VISIBLE RANGE: 40-7/8” SIDE CONNECT SLIDE TO 40-7/8” …GAGE SIZE 93 1/2“ NPT 1S VALVE MODEL, OFFSET INSIDE DROP DOWN COLUMN: 40-5/8” (MINIMUM) EXAMPLE USING 40.00” VISIBLE RANGE, C-C LESS THAN 44” 93TM-CH SPECIFICATION C-C: 44” VISIBLE RANGE: 40-7/8”

Level ARC Program Advantages to Rep

MODELS Glass Size 1 thru 9 No. of Sections 1 and up Glass Type Weld Pad ▀ Carbon Steel, LTCS, 316 Stainless. ▀ Reflex or Transparent glass. ▀ Other material per request. ▀ No pressure rating. ▀ Flat chamber or curved chamber for vessel radius. ▀ Customer welds the chamber pad to the vessel wall. 91-RWP Glass Size 1 thru 9 No. of Sections 1 and up Glass Type Reflex or Transparent Gage Purpose