SOLID CONSTRUCTION PTFE STEP FACE GASKETS FOR IMPROVED SEALING PERFORMANCE IN MONDI PIPING
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1 SOLID CONSTRUCTION PTFE STEP FACE GASKETS FOR IMPROVED SEALING PERFORMANCE IN MONDI PIPING MIKE SHORTS, VP & GM TRIANGLE FLUID CONTROLS LTD. BELLEVILLE, ONTARIO, CANADA PHONE:
2 BACKGROUND SULFURIC ACID AND ITS BY-PRODUCTS ARE A SIGNIFICANT CONCERN TO THE DESIGN OF MATERIAL HANDLING EQUIPMENT MANY MATERIAL CONFIGURATIONS HAVE BEEN DEVELOPED IN ORDER TO HANDLE THESE PRODUCTS ONE OF THE MORE POPULAR HAS BEEN MONDI PIPING SYSTEMS
3 BACKGROUND MONDI PIPING SPECIAL ALLOY OF DUCTILE IRON (LOW YIELD STRENGTH) IMPROVES OVERALL CHEMICAL RESISTANCE OF PIPING SYSTEM WITHIN A REASONABLE ROI (COMPARED TO REGULAR DUCTILE IRON AND GRAY CAST IRON) TEMPERATURE RESISTANCE TO 149 O C (300 O F) SPECIAL FLANGE FACE DESIGN REQUIRES REDUCED CONTACT AREA GASKETS STEP RING GASKETS PHONOGRAPHIC FINISH IS A POTENTIAL LEAK PATH AND DIFFICULT FOR HARD MATERIALS TO SEAL
4 BACKGROUND STEP RING GASKETS REDUCES THE CONTACT AREA FOR BETTER CONCENTRATION OF AVAILABLE SEALING LOAD OEM STYLE GASKETS ARE SILICA-FILLED FAWN PTFE GASKETS WITH 2 LAYERS OF MATERIAL BONDED TOGETHER WITH 2-SIDED ADHESIVE TAPE PROVIDES AN EFFECTIVE SHORT-TERM SEAL FABRICATION PROCESS CAN RESULT IN UNCONTROLLED FINISHED GASKET THICKNESS AND LEAK PATHS FROM IMPRECISE ADHESIVE PREPARATION MULTILAYER APPROACH INCREASES CREEP
5 PHONOGRAPHIC (B) FLANGE FINISH CONTINUOUS PATH FOR POTENTIAL LEAKS HARDER TO SEAL THAN CONCENTRIC (A) GROOVE FINISH SOFTER MATERIALS ARE BETTER FOR SEALING (DEFORMATION INTO THE GROOVES) PRODUCT MANUFACTURING STYLE (CALENDERED, SKIVED, EXPANDED) IS NOT TYPICALLY A FACTOR
6 CREEP RELAXATION INDIVIDUAL COMPONENTS (SMALL AND LARGE RINGS) OF THE SILICA- FILLED FAWN GASKETS PROVIDES GOOD CREEP RESISTANCE MULTI-LAYERED STEP RING GASKETS INTRODUCE ADDITIONAL CREEP (FROM ADHESIVE) THAT CAN EXHIBIT PERFORMANCE CONCERNS LAYERS CAN SLIP ON EACH OTHER
7 ASTM F38 - Creep Relaxation CREEP RELAXATION (1/8 THICKNESS) 100% OEM CREEP >80% 50% SINGLE LAYER GLASS FILLED PTFE 55% SILICA FILLER COMPONENT OF OEM 0% 1/32" Single 1/8" Single 1/8" Multi- 1/8" Single GASKET IS AN IARC (INTERNATIONAL AGENCY FOR RESEARCH ON CANCER) GROUP 1 PRODUCT WHICH RESTRICTS Layer Fawn PTFE Layer Fawn PTFE (estimated) Layer Fawn PTFE Layer Blue PTFE THE ABILITY TO CONSTRUCT SINGLE- PIECE FAWN PTFE STEP RING GASKETS
8 LOAD RETENTION GASKET LOAD RETENTION FIXTURE ASSEMBLY WITH OEM PROCEDURES AND TORQUE SPECIFICATIONS (120 FT-LBS) REST PERIOD OF 24 HOURS BREAK TORQUE DETERMINED
9 LOAD RETENTION OEM FAWN PTFE GASKETS, 62.8% 65% LOAD LOSS (AVG) BLUE GLASS FILLED SOLID CONSTRUCTION GASKETS, 55.9% 60% LOAD LOSS (AVG) TIGHTER SEAL VS TIME FOR BLUE 55% GASKETS OEM GASKETS CAN SUFFER LAMINATE STRETCH AND RELEASE EXPOSING MORE ADHESIVE TO ACID 50% OEM Fawn PTFE Blue Glass Filled PTFE
10 ADHESIVE COMPATIBILITY OEM ADHESIVE IS THE WEAK LINK IN THE ENTIRE SEALING SYSTEM FAWN PTFE IS VERY RESISTANT TO SULFURIC ACID ADHESIVE MANUFACTURER DATA: INTENDED FOR LONG-TERM CONTINUOUS USE TO 149 O C (300 O F) RELATIVE (VERY GOOD) SOLVENT RESISTANCE SHELF LIFE OF 24 MONTHS FROM THE DATE OF MANUFACTURE AT 21 O C (70 O F) AND 50% R.H.
11 ADHESIVE COMPATIBILITY INDEPENDENT LAB TESTING OF ADHESIVE IN 96% SULFURIC ACID AT AMBIENT TEMPERATURE EVALUATED AT: 24 HOURS 48 HOURS 72 HOURS SIGNIFICANT DEGRADATION AFTER ONLY 24 HOURS AND NEARLY DISSOLVED AFTER 72 HOURS
12 SEALABILITY STANDARD FIXTURES ARE NOT GENERALLY EQUIPPED TO TEST THESE TYPES OF GASKETS CUSTOM FIXTURE BUILT FOR THIS EVALUATION SAMPLE SIZE IN ACCORDANCE WITH ASTM F2378 WITH N PSIG GASKET LOAD OF 60.8 MPA (8,823 PSI) ACCORDING TO OEM RECOMMENDATIONS
13 SEALABILITY 3 SETS OF TESTS WERE CONDUCTED MULTI-LAYER OEM FAWN GASKET SOLID CONSTRUCTION BLUE GASKET MULTI-LAYER OEM GASKET WITHOUT ADHESIVE NEW CONDITION (OEM AND BLUE) PERFORM VERY WELL (AS EXPECTED) SAMPLE REPRESENTING CHEMICAL ATTACK OF ADHESIVE EXHIBITED CRITICAL LEAKAGE Test Sample Description Multi-layer fawn PTFE with adhesive Single layer blue glass Filled PTFE Multi-layer fawn PTFE with no adhesive Leakage (cc/min) >1,149
14 CONCLUSIONS MONDI PIPING REQUIRES REDUCED CONTACT AREA GASKETS OEM STEP RING STYLE IS A VERY GOOD DESIGN CREEP RELAXATION OEM FAWN PTFE HAS HIGHER CREEP THAN SINGLE CONSTRUCTION BLUE GLASS FILLED PTFE LOAD RETENTION BLUE GLASS FILLED PTFE GASKET EXPERIENCES LESS LOAD LOSS AFTER 24 HOURS THAN OEM FAWN GASKET
15 CONCLUSIONS CHEMICAL RESISTANCE OEM FAWN MULTI-LAYER GASKET USES AN ADHESIVE WHICH WAS DETERMINED IS NOT COMPATIBLE WITH SULFURIC ACID BLUE GLASS FILLED PTFE GASKET IS ONE PIECE AND EXHIBITS EXCELLENT H 2 SO 4 RESISTANCE SEALABILITY ORIGINAL CONDITION OEM FAWN GASKET SEALS VERY WELL BUT EXPOSURE TO H 2 SO 4 AFTER A VERY SHORT PERIOD OF TIME COMPROMISES THE INTEGRITY OF THE SEAL LONG-TERM DURATION OF ADHESIVE DURING ASSEMBLY WAS OUTSIDE THE SCOPE OF THIS PAPER BUT OUTSIDE PIPING INFLUENCES CAN CAUSE ACCELERATED EXPOSURE TO THE ACID CAUSING CATASTROPHIC FAILURE SINGLE PIECE CONSTRUCTION BLUE GLASS FILLED PTFE GASKET DOES NOT SUFFER FROM ACID ATTACK AND WILL MAINTAIN A SEAL (GIVEN OTHER TESTED FACTORS) BETTER AND LONGER THAN OEM FAWN GASKET
16 THANK YOU MIKE SHORTS VICE PRESIDENT & GENERAL MANAGER TRIANGLE FLUID CONTROLS LTD. BELLEVILLE, ONTARIO, CANADA PHONE:
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