ASTM_C_450_-_08_2014.pdf

Designation:C45008(Reapproved 2014)Standard 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 insulation that shall be used in fabricating covers foruse on valves,ells,tees,flanges,and vessels in the pressurerange from 150 to 1500 psi(1 to 10 MPa).These tables,whichare part of this standard,are published separately as the ASTMRecommended Dimensional Standards for Fabrication of Ther-mal Insulation Fitting Covers for NPS Piping,and VesselLagging.The tables provide dimensions for use in formingpipe fitting covers for NPS pipe operating at high temperatureand low temperature.The tables also include dimensions foruse in forming thermal insulation into curved segments,andlagging,for application on vessels.This practice does not applyto reflective-type insulation.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.Eachmethod has certain advantages and disadvantages,dependingupon the material to be formed,number of cuts required,material waste permissible,and quantity of fittings beingproduced.Fitting parts are assembled using adhesives andfabrication cements applied using dip pots,rollers,doctorblades,brush,or trowel,depending upon the materials beingused.Any specification of the fabrication techniques is beyondthe scope of this standard.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC585 Practice for Inner and Outer Diameters of ThermalInsulation for Nominal Sizes of Pipe and Tubing2.2 ASTM Adjuncts:3Fabrication of Thermal Insulating Covers for NPS Pipingand Vessel Lagging3.Terminology3.1 DefinitionsFor definitions used in this practice seeTerminology C168.4.Significance and Use4.1 This system of dimensions provides a guide for formingthermal insulation in advance of field application.Forming isdone by cutting,grinding,milling,or molding,depending uponthe method most suitable for the thermal insulation beingfabricated.It is equally applicable for all service temperatureranges.5.Basis of Design5.1 All dimensions presented are based on the use of pipeinsulation manufactured to Practice C585 and to the BasicDimensional Standards for Pipe Insulation as given in Tables 1and Tables 2 of the Fabrication of Thermal Insulating Coversfor NPS Piping and Vessel Lagging.35.2 The tables provide dimensions for insulation fittingcovers for installation on nominal pipe size(NPS)pipeoperating at high and low temperatures.5.3 Dimensions presented for cutting beveled blocks frompreformed thermal insulation(lags)are based on blocks 6 in.(152 mm)wide by the thickness required.5.4 Dimensions given for flanged pairs,flanged fittings,andflanged valves do not allow for flange bolt removal.When bolt1This 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 1,2014.Published April 2014.Originallyapproved in 1960.Last previous edition approved in 2008 as C450 08.DOI:10.1520/C0450-08R14.2For 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.3Available from ASTM International Headquarters.Order Adjunct No.ADJC0450A.Original adjunct produced in 1976.Adjunct last revised in 2002.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 removal is required,the covering length over the flange shallbe increased as specified by the purchaser.6.Fabrication6.1 Any method of forming may be used if the resultingfitting conforms to inside and outside the dimensions listed.6.2 The main body of the insulation fitting shall be cut fromstandard pipe size pipe covering of the proper size andthickness.6.3 Where only one insula