FABRIC EXPANSION JOINT

Transcription

1 2011 FABRIC EXPANSION JOINT CATALOGUE FLYTECH ENGINEERING SDN BHD 1/1/2011

2 What do you have to consider before selecting PLACE TO INSTALL MOVEMENTS PRESSURE Is the place to install easily accessible? Is scaffold required to install the expansion joint? Is a crane or other equipment required to lift the expansion joint in place? Is the expansion joint should be supplied as complete unit or in kit form for site assembly? Axial compression Axial elongation Pressure has important influence to the design of expansion joint, types, materials and number of layers. The important pressure values to consider are: Positive pressure Negative pressure Pulsations Pressure surges Design/operating pressure MEDIUM TEMPERATURE The design and types of expansion joint is decided by the type of medium Air Clean Dust content Contents of soot or fly ashes Chemical load Humidity Liquid Clean Dust content Chemical load Angular offset Lateral offset In the same way as medium and pressure, temperature has important affect to the design of expansion joint, types, outer cover materials, and thickness. The important temperature values to consider are: Operating temperature Design temperature Variation in temperature Design temperature Excursion temperature Page 1

3 SLEEVE / BAFFLE an expansion joint? FABRIC EXPANSION JOINT SLEEVE/BAFFLE Use of sleeve / baffle ensures: Better flow efficiency Protection an abrasion Longer life to an expansion joint Fixation of insulation in expansion joint DUCT CONNECTIONS CONFIGURATIONS Belt expansion joint Single flow sleeve welded to duct end Flanged expansion joint Flat type Single flow sleeve fitted with expansion joint Belt/flanged expansion joint Convex type Single flow sleeve overlapping the opposite duct end Concave type Double-acting flow sleeve ARRANGEMENT OF DUCT Horizontal Vertical Diagonal Convoluted type Floating flow sleeve Page 2

4 FABRIC Expansion Joint The Fabric Expansion Joints offer a number of profits: MULTI-LAYER EXPANSION JOINTS By combining different materials and considering their thermal, chemical and mechanical resistance as well as their fatigue properties, we certify the best solution both in technical and economical respect. Basically the design of multi-layer expansion joints consist four groups of materials: They are able to receive movements in several directions coincidently They are easy to adapt to existing physical conditions They need little space to install They are easy to transport and to install They have almost no reactive forces OUTER COVER MATERIALS GAS BARRIER INSULATION MATERIALS Protect the expansion joint from pressure and temperature and ensure the stability. In most cases the material is coated or laminated and may also function as gas barrier. Stainless steel wire mesh and steel bands are further used for give added mechanical protection and dimension stability. Gas barrier is the actual sealing element, usually placed between fabric layers or integrated in the outer cover. TEMPERATURE-RESISTANT FABRICS Very strong and temperature resistance fabrics are use to protect the gas barrier and/ or the insulation materials. Protect both the gas barrier and the other expansion joint materials from high temperature of the medium Page 3

5 Arise from our modern production facilities, machinery and tools; we are able to manufacture the expansion joints of almost any form and design, independent of the size of the duct We use modern computer software and method for the design and construction of the expansion joints. SINGLE-LAYER EXPANSION JOINTS Single-layer expansion joints consist of one material layer only. According to the application area, the layer is manufactured from fabrics, elastomers or fluoropolymers with fabric reinforcement as composite materials. Single-layer expansion joints offer most tightness and chemical resistance. BASIC VERSION OF FABRICEXPANSION JOINT BOLSTER The main purpose of bolster is to: Reduce the temperature to the expansion joint and thermal sensitive layers Protect the expansion joint from fly ash Noise attenuation Support the expansion joint in case of pulsations in the duct And there are three forms of bolster techniques: Integrating in the actual expansion joint layer Insulation bolster bag Loose insulating materials resting between the expansion joint and the sleeve/baffle CLOSED END TYPE For all types of connection Complete preassembled units with all steel components, insulation etc. Single and multi-layer design Accurate dimensions required Usually supplied with holes punched Quick installation Can be supplied in sections and assembled on site OPEN END TYPE Closed on site Not usually supplied with holes Quick replacement and/or assembly in case of damage (repair work) Idea for stockkeeping as spare parts, in rolls Page 4

6 Flytech has the ability to supply fabric joints custom designed to suit a client's individual specifications or can offer a comprehensive range of standard products as specified below. Flytech can provide fabric joints complete with any associated steelwork for temperatures up to 1200 degrees Celsius. Flytech fabric joints are available with several external cover materials designed to withstand the most difficult atmospheric conditions. Flytech fabric joints can be manufactured to any size & transported to site as a complete unit or in kit form for site assembly. Townson Standard Range of Fabric Joints: FS 250 allowable working temperature 250 c FS 350 allowable working temperature 350 c FS 500 allowable working temperature 500 c FS 600 allowable working temperature 600 c F S 1000 allowable working temperature 1000 c F = Fabric Multilayered Joint S = Silicone coated fabric outer over material Other available materials T = Fluoroelastic Material V = FKM Viton or Fluorrel Material E = EPDM Effective length Axial compression Axial extension Lateral movement The allowable pressure rating of multilayered fabric joints will vary depending on various parameters. As a guide for general usage, use 0.15 bars as an allowable working pressure. Page 5

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