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Saint-Gobain's ISO Compliant OmniSeal Single Stem Sealing Solutions for Reducing Fugitive Emissions
Saint-Gobain Seals Develops ISO 15848-1 Compliant, OmniSeal® Single Stem Sealing Solution for Quarter-turn Valves, Reducing Fugitive Emissions
By: Saint-Gobain Seals
In order to meet future challenges for fugitive emissions, Saint-Gobain Seals began the process quite some time ago with the development of their low fugitive emission (LFE) seals. The objective was to develop a single stem sealing solution for ON/OFF valves that passed leakage tightness of Class BH and endurance class CO1 (500 cycles) from -50°C to 160°C according to the ISO 15848 quality standard. Since each valve can have up to four or more possible emissions centers: a bonnet gasket, two flange gaskets and a valve stem (which is the main emission source for valves), their main focus became concentrated on engineering a solution with the valve stem.
In order to achieve this, Saint-Gobain Seals invested in a test rig that solely operated according to the ISO 15848-1 criteria. Their first step was to study the impact of jacket and spring designs on LFE leakage performance. They also selected materials that optimized leakage performance by limitation of permeation. The next step was to optimize the design of their V-packing component to improve leakage performance with the help of FEA analysis. Based on testing data and past experience and knowledge, they developed different design concepts using their well-established and proven OmniSeal® spring-energized product to pass the specification. To validate the new OmniSeal® designs, Saint-Gobain Seals Research & Development used helium as test fluid while the measurement was conducted in a close chamber under vacuum with a mass spectrometer for detection to give the highest accuracy.
Compared to other sealing solutions for low fugitive emissions such as compression packings, the OmniSeal® spring-energized seal offers the following benefits:
• Compliant with ISO 15848-1 Class B, from -50°C to +160°C, endurance class CO1 (500 cycles)
• No need for secondary seal
• High Pressure, High Temperature combinations
• Easier installation compared to compression packings
• Does not need to be compressed axially
• Lower operating torques / forces
• Long life
In order to reach the best performance, it is also important to follow specific installation guidelines. Polymer spring-energized seals must be handled with extreme care and must not be unpacked and put down on dirty surfaces before installation. All mating surfaces must be clean and without any scratches and corrosion, and the roughness of sealing surfaces must comply with OEM recommendations.
Saint-Gobain Seals has been successful in providing sealing and polymer solutions in other areas of the oil and gas industry, having their OmniSeal® seals certified for the axial control valves portion of the first subsea gas compression system that will go on stream at a water depth of 3,000m in Norway in 2015, frequent use of their OmniSeal® RACO™ seal for offshore LNG (liquefied natural gas) transfer in dynamic conditions, and selection of their Meldin® 5000 series product for packing kit backup rings in a hydraulic drilling jar (down hole drilling application)
They recently contributed an article in Valve World magazine (November 2014 issue) with a more in-depth discussion on their new single-stem sealing solution. They will also be launching this new product at Valve World 2014 (Hall 3, Booth B88), which is being held from December 2 to 4, 2014, in Düsseldorf, Germany.
About Saint-Gobain Seals (www.seals.saint-
Saint-Gobain Seals is a strategic business unit under Saint-Gobain Performance Plastics’ Engineered Components SOA (sector of activity); our parent company, Saint-Gobain, is one of the world’s top 100 industrial groups. With more than 50 years of manufacturing experience and an established global presence (with strategic sites in Garden Grove, California, USA; Kontich, Belgium; and Minhang, Shanghai, China), we offer a diverse range of innovative sealing and polymer solutions:
• OmniSeal® Spring–Energized Seals
• OmniLip™ PTFE Rotary Shaft Seals
• OmniFlex™ Fluoroelastomer Seals
• Rulon® High-Performance Fluoropolymer Compounds
• Meldin® 7000 Thermoset Polyimide Materials
• Meldin® HT High-Performance Thermoplastic Materials
Other products include Fluoroloy® (high-performance custom-formulated compounds), cup seals, hydraulic seals, metal seals, v-packings, piston rings, Marathon® (valves and vacuum pump diaphragms), Rulon® fluoropolymer compounds, polymer bearings and stock shapes. The majority of seals and polymer components manufactured are custom designed and matched with the best materials to optimize their performance in various applications and markets.
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