ASTM_C_450_-_18.pdf

Designation:C45018Standard Practice forFabrication of Thermal Insulating Fitting Covers for NPSPiping,and Vessel Lagging1This standard is issued under the fixed designation C450;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice provides tables of dimensions of pre-formed pipe insulation that shall be used in fabricating insula-tion covers for use on valves,ells,tees,flanges,and vessels inthe pressure range from 150 to 1500 psi(1 to 10 MPa).Thesetables,which are part of this standard,are published separatelyas the ASTM Recommended Dimensional Standards for Fab-rication of Thermal Insulation Fitting Covers for NPS Pipingand Vessel Lagging.In addition,the ADJC0450A tables forShort Radius(SR)and Long Radius(LR)Elbows InsulationFitting Covers for piping are included in this practice.Thetables were developed to provide dimensions for shop fabrica-tion use in forming pipe insulation fitting covers on NPS pipeoperating at high temperature and low temperature.The tablesalso include dimensions for use in forming thermal insulationinto curved segments,and lagging,for application on vessels.This practice does not apply to reflective-type insulation,insulation on screwed elbows,Short Radius(SR)and LongRadius(LR)Elbows Fitting Covers for tubing,dutchman(extended leg)insulation fitting covers,double-layeredstaggered-joint pipe insulation fitting covers,flexible pre-formed pipe-tube elastomeric foam fitting covers in accordancewith Specification C534/C534M or polyolefin foam fittingcovers in accordance with Specification C1427.1.1.1 Refer to Guide C1710 when referring to insulationmaterials for fabrication of preformed flexible closed cellinsulated 90 elbows,tees,or similar products.1.2This practice does not specify fabrication methods.Thermal insulation for fitting covers is formed by numerousfabrication methods.In general,insulations are cut by circularor band saws,shaped by grinders or millers,or molded/preformed.Each method has certain advantages anddisadvantages,depending upon the material to be formed,number of cuts required,material waste permissible,andquantity of fittings being produced.Fitting parts are assembledusing adhesives and fabrication cements applied using dip pots,rollers,doctor blades,brush,or trowel,depending upon thematerials being used.Any specification of the fabricationtechniques is beyond the scope of this standard.1.3 The values stated in inch-pound units are to be regardedas standard.In a few parts of this practice,the values given inparentheses are mathematical conversions to SI units that areprovided for information only and are not considered standard.The dimensional standard tables with fractional inch-pound(I.P.)system provided from the adjunct and in this documentstables are currently not available in decimal and metricequivalents.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC534/C534M Specification for Preformed Flexible Elasto-meric Cellular Thermal Insulation in Sheet and TubularFormC585 Practice for Inner and Outer Diameters of ThermalInsulation for Nominal Sizes of Pipe and TubingC1427 Specification for Extruded Preformed Flexible Cel-lular Polyolefin Thermal Insulation in Sheet and TubularFormC1710 Guide for Installation of Flexible Closed Cell Pre-formed Insulation in Tube and Sheet Form1This practice is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.20 on HomogeneousInorganic Thermal Insulations.Current edition approved April 1,2018.Published April 2018.Originallyapproved in 1960.Last previous edition approved in 2017 as C450 17.DOI:10.1520/C0450-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization