1、Designation: C 450 08Standard Practice forFabrication of Thermal Insulating Fitting Covers for NPSPiping, and Vessel Lagging1This standard is issued under the fixed designation C 450; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 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 co
3、vers 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, a
4、nd 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 doe
5、s not applyto reflective-type insulation.1.2 This 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 ad
6、vantages 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, dependi
7、ng 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 only
8、and 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 limitati
9、ons prior to use.2. Referenced Documents2.1 ASTM Standards:2C 168 Terminology Relating to Thermal InsulationC 585 Practice for Inner and Outer Diameters of RigidThermal Insulation for Nominal Sizes of Pipe and Tubing(NPS System)2.2 ASTM Adjuncts:3ADJC0450 Recommended Dimensional Standards for Fab-ri
10、cation of Thermal Insulating Fitting Covers for NPSPiping and Vessel Lagging3. Terminology3.1 DefinitionsFor definitions used in this practice seeTerminology C 168.4. Significance and Use4.1 This system of dimensions provides a guide for formingthermal insulation in advance of field application. For
11、ming 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 P
12、ractice C 585 and to the BasicDimensional Standards for Pipe Insulation as given in Tables 1and Tables 2 of the ASTM Recommended Dimensional Stan-dards for Prefabrication and Field Fabrication of ThermalInsulation Fitting Covers for NPS Piping, and Vessel Lagging.31This practice is under the jurisdi
13、ction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.20 on HomogeneousInorganic Thermal Insulations.Current edition approved May 1, 2008. Published May 2008. Originallyapproved in 1960. Last previous edition approved in 2002 as C 450 02.2For reference
14、d 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 at a nominal cost from fromASTM International Headquarters. Orde
15、rAdjunct No. ADJC0450.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 The tables provide dimensions for insulation fittingcovers for installation on nominal pipe size (NPS) pipeoperating at high and low temperatures.5.3 Dimension
16、s 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 boltremoval is required, the covering
17、 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 th
18、e proper size andthickness.6.3 Where only one insulation type is required, and isavailable in sufficient thickness, multiple layers are not re-quired.6.4 Where two insulations of different temperature ratingsare required, each insulation type shall be assembled in itsproper location in the fitting u
19、sing double layer construction.6.5 Flat block, cut to proper curvature, may be used in placeof preformed pipe insulation. The user shall be informed whena change, for example, supplying a fabricated product insteadof a molded or preformed pipe insulation, that may causedifferences in the thermal or
20、mechanical performance charac-teristics of the end product.6.6 Where the body of the flange cover extends overadjacent pipe insulation, the portion of the cover shall befabricated using the pipe insulation as the body and adding aninsert collar. Another method, which has been used, is byadding an in
21、sert or section, commonly called a “dutchman,”made of block.6.7 Valves manufactured by various companies for the samepressure and nominal pipe size may not have the same bonnetdimensions, or height of bonnet flange above centerline ofvalve. Because of this, the valve insulation is designed to fit th
22、elargest valve of a size, type, and pressure. In some instances,additional insulation may be required to fill or build up theinsulation for proper fitting around the bonnet. In otherinstances it may be necessary to cut back insulation around thebonnet to provide access to the packing gland. Cutout f
23、or handwheel assembly and packing gland should be done at time ofapplication.7. Assembly and Tolerances7.1 All formed pieces shall fit tightly together so that bothsides and length of the insulation joint can close within amaximum of116 in. (1.6 mm).7.2 Low-temperature pipe insulation fabricated fro
24、m blockor board stock shall contain no more than four cemented“through” joints per full section of insulation, excluding thehalf section mating plane.7.3 Finished pieces shall be identified using tags, attachedstrip, etc. for ease of field installation.7.4 The inner and outer surface of vessel insul
25、ation sectionsshall be concentric with the outer surface. The deviation fromconcentricity shall not exceed316 in. (5 mm).7.5 Material (glue, adhesives, etc.) used in the fabrication offitting covers shall be those recommended by the manufacturerfor the specific application and exposure conditions.8.
26、 Field Application Sequence8.1 Insulation coverings for welded or screwed fittingsshould be applied before the pipe insulation.8.2 Pipe insulation should be installed up to all flanges,flanged fittings, and flanged valves. Provide sufficient space forfuture bolt removal where required.8.3 Covers for
27、 flanges, flanged fittings, and flanged valvesshould be installed so as to extend, not less than specifiedthickness, over adjacent pipe insulation or minimum 2 in.(50mm).8.4 Where required, the junction between the pipe insula-tion and flanged fittings covers can, by use of non-settingcements, seale
28、nts or other methods, also serve as an expansionor contraction joint.9. Keywords9.1 dimensions; thermal insulating materials; thermal insu-lating materialsfabrication; thermal insulating materialsfittings; thermal insulating materialspipeC450082ASTM International takes no position respecting the val
29、idity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is sub
30、ject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headqua
31、rters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standa
32、rd is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C450083
