Copyright 2010© All Rights Reserved This is the Official Website of Gasket Factory Branch of AL-IMAN Factories Co.  Graphics Designs, Animation, and Scripting are copyrighted by the author.   http://www.imangaskets.com SPIRAL WOUND  Spiral Wound Type Gaskets are suitable for a wide  range of operating conditions and can be adapted to  suit almost all applications. The gaskets can seal  fluid pressures up to 250 bar and temperature range  of -200°C to 1000°C. The gasket is easy to install and remove    and will not cause damage to the flange surfaces. A  combination of winding materials and metals are available  which enable the gasket to meet the requirements of varied  operating conditions.  ISW1 AL-IMAN SPIRAL WOUND GASKET  The ISW1  AL-IMAN Spiral Wound gasket has no metal  ring. This style is suitable for tongue and groove face  connection and sometimes for male and female face  connection but not suitable for ordinary pipe flange of  raised face. This style is commonly used for valve bonnet,  pressure vessels, etc. ISW2 AL-IMAN SPIRAL WOUND GASKET  The ISW2 AL-IMAN Spiral Wound gasket has a metal  inner ring. As inner ring works as reinforcement to prevent  internal extrusion or inward buckling of gasket windings  caused by compression, this style is suitable for male and  female face connection but not suitable for ordinary pipe  flange of raised face. ISW3 AL-IMAN SPIRAL WOUND GASKET  The ISW3 AL-IMAN Spiral Wound gasket has outer metal  ring. TheOuter ring works as: 1. centering a gasket properly between the flanges,  2. limiting bolt load at proper compression,  3. preventing external expansion by compression.  For PTFE filler gasket, this style is basically not  recommended due to possibility of inward buckling during  compression.This style is most common for ordinary pipe  flange of raised face. ISW4 AL-IMAN SPIRAL WOUND GASKET  The ISW4 AL-IMAN Spiral Wound gasket has both metal  outer and inner ring. As inner ring works to prevent  internal extrusion or inward buckling, this style is  especially recommended for the following cases.  1. For flanges NPS 24 and larger in class 900, NPS  12 and larger in class 1500 and NPS 4 and larger  in class 2500 #.  2. PTFE filler material.  3. For socket welding, lapped, welding neck and  integral flanges. This style is suitable for pipe or  pressure vessels using raised face flange  connection.  General Characteristics and Applications SPIRAL WOUND