Designation: C 585 – 90 (Reapproved 2004)
Standard Practice for
Inner and Outer Diameters of Rigid Thermal Insulation for Nominal Sizes of Pipe and Tubing (NPS System) 1 This standard is issued under the fixed designation C 585; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript supers cript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Sco Scope pe
nest layers of different materials, or layers supplied by different manufacturers. Individual manufacturing processes may operate at slightly different tolerances. While the product will fit the pipe, it may not readily nest as the outer layer between the different dif ferent materials or with different manufacturers. Care should be exercised to determine these differences before specifying or ordering nesting sizes. 4.3 Dimensio Dimensions ns in acc accord ordanc ancee wit with h thi thiss pra practi ctice ce per permi mitt application of one thickness of pipe insulation over another (Nesting (Nest ing or Simp Simplifie lified d Dimen Dimensiona sionall Syste System), m), to obtai obtain n total thicknesses greater than those manufactured as single layer, or for multilayer application when desired.
1.1 This practice practice is intended as a dime dimension nsional al standard standard for preformed rigid thermal insulation for pipes and tubing. 1.2 This practice practice cover coverss insul insulatio ation n suppl supplied ied in cyli cylindric ndrical al sectio sec tions, ns, usu usuall ally y spl split it int into o hal half-s f-sect ection ions, s, and lis lists ts rec recomommended inner and outer diameters of insulation having nominal wall thicknesses from 1 to 5 in. (25 to 127 mm) to fit over standard sizes of pipe and tubing. 1.3 The values stated in in inch-pound units are to be regarded as the standard. The values stated in SI units are provided for information only. standard does not purpo purport rt to addr address ess the safet safetyy 1.4 This standard concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
5. Proc Procedur eduree NOTE 1—Sugges 1—Suggested ted toleran tolerances ces are shown for inform information ation purposes only.
5.1 Measurement : 5.1.1 Measurement Measurement of inner and outer diameters diameters shal shalll be 1 made to the nearest ⁄ 32 32 in. (0.8 mm) using a steel tape or rule. 5.1.1.1 Half Sections—The diameter reported for each halfsection shall be the average of six measurements taken at three locations including two near the ends and one near the center (see Fig. 1a and Fig. 2a). Three of the six readings shall be taken in the longitudinal plane of the flat, cut surface: the other three shall each be twice a half-diameter in the longitudinal plane at right angles to that of the first three (see Fig. 1b and Fig. 2b). 5.1.1.2 Hinged Sections—The diameter reported for each hinged section shall be the average of four measurements taken at both ends of the section (two per end) (see Fig. 3). The two measurements at each end shall be at right angles. 5.2 Recommended Inner Diameters: 5.2.1 Inner diameters and suggested suggested tolerances for nominal nominal sizes of insulation for pipe are shown in Table 1. Iron pipe in size si zess fo forr 41 ⁄ 2 , 5, 77-in in.. (1 (113 13,, 12 125, 5, 17 1755-mm mm), ), an and d la larg rger er odd-numbe oddnumbered red diameters diameters is not stan standard, dard, but insul insulatio ation n for these is included for multi-layer purposes. 5.2.2 Inner diameters and suggested suggested tolerances for nominal nominal sizes of tubing through 6 in. (150-mm) are shown in Table 2. 5.3 Recommended Outer Diameters:
2. Referenced Documents 2.1 ASTM Standards: 2 C 168 Ter Terminology minology Relating to Thermal Insulation 3. Terminology 3.1 Definitions—Definitions pertaining to insulation are defined in Terminology C 168. 4. Signi Significanc ficancee and Use 4.1 The purpose of this practice practice is to ensure satisfact satisfactory ory fit on standard sizes, to accommodate radial expansion of pipes and an d tu tube bess wh whic ich h ar aree he heat ated ed af afte terr be bein ing g in insu sula late ted, d, an and d to minimize the number of insulation sizes and thicknesses to be manufactured and stocked. 4.2 Whil Whilee insu insulati lation on may be manufactured manufactured to these recomrecommended dimensions, care should be exercised in attempting to 1
This practice is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.20 on Homogeneous Inorganic Thermal Insulations. Curren Cur rentt edi edition tion app approv roved ed Apr April il 1, 200 2004. 4. Pub Publish lished ed May 200 2004. 4. Orig Original inally ly approved in 1966 to replace C 312 and C 521. Last previous edition approved in 1998 as C 585 – 90 (1998). 2 For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@
[email protected] astm.org. g. For For Annual Annual Book of ASTM volume information, refer to the standard’s Document Summary page on Standards volume Standards the ASTM website website..
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
C 585 – 90 (2004)
Fig. 1a
Fig. 1b
Three Meaurement Locations
Diameter and Half-Diameter Measurement Locations
FIG. 1 Inner Diameter Measurement
Fig. 2a
Fig. 2b
Three Measurement Locations
Diameter and Half-Diameter Measurement Locations
FIG. 2 Outer Diameter Measurement
6. Keywords
5.3.1 Nominal outer diameters for nominal sizes of pipe are shown in Table 3 and Table 4 and tubing in Table 5 and Table 6. It should be noted that these values for both pipe and tubing are identical with iron pipe outer diameters as shown in Columns 2 and 3 of Table 3 and Table 4. Table 3, Table 4, Table 5, and Table 6 are for nesting purposes only. When product is to be nested, it shall be so stated on order.
6.1 pipe thermal insulation diameter; pipe thermal insulation dimension; pipe thermal insulation thickness; thermal insulation; thermal insulating materials-pipe; thermal insulating materials-rigid; tubing thermal insulation thickness
5.3.2 Suggested maximum outer diameters for nominal sizes of pipe are shown in Table 7 and Table 8 and tubing in Table 9 and Table 10. Table 7, Table 8, Table 9, and Table 10 are for jacketing purposes only. 5.4 Approximate Insulation Wall Thickness : 5.4.1 For information purposes, the wall thicknesses of pipe insulation obtained by subtracting inner diameters in Table 1 from corresponding outer diameters in Table 3 and Table 4, and dividing the results by two, are shown in Table 11. Corresponding values for tubing are shown in Table 12.
2
C 585 – 90 (2004)
FIG. 3 Hinged Section Measurement Locations TABLE 1 Inner Diameter of Insulation for Nominal Pipe Size (NPS) Pipe Nominal Size in. ⁄ 2 ⁄ 4
1 3
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 41 ⁄ 2 5 6 7 8 9 10 11 12 14A A
Insulation
Outer Diameter
Tolerance
Inner Diameter
Minus
Plus
in.
mm
in.
mm
in.
mm
0.840 1.050 1.315 1.660 1.900 2.375 2.875 3.500 4.000 4.500 5.000 5.563 6.625 7.625 8.625 9.625 10.750 11.750 12.750 14.000
21.3 26.7 33.4 42.2 48.3 60.3 73.0 88.9 101.6 114.3 127.0 141.4 168.3 193.7 219.1 244.5 273.0 298.4 323.8 355.6
0.86 1.07 1.33 1.68 1.92 2.41 2.91 3.53 4.03 4.53 5.03 5.64 6.70 7.70 8.70 9.70 10.83 11.83 12.84 14.09
22 27 34 43 49 61 74 90 102 115 128 143 170 196 221 246 275 300 326 358
0 0 0 0 0 0 0 0 1 ⁄ 32 1 ⁄ 32 1 ⁄ 32 1 ⁄ 32 1 ⁄ 32 1 ⁄ 32 1 ⁄ 32 1 ⁄ 32 1 ⁄ 32 1 ⁄ 32 1 ⁄ 16 1 ⁄ 16
0 0 0 0 0 0 0 0 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 1.6 1.6
Larger sizes through 26 in., in 1-in. (25.4-mm) increments.
3
in.
mm
⁄ 16 ⁄ 16 1 ⁄ 16 1 ⁄ 16 1 ⁄ 16 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32 5 ⁄ 32
1.6 1.6 1.6 1.6 1.6 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 2.4 4.0
1 1
C 585 – 90 (2004) TABLE 2 Inner Diameter of Insulation Tubes Tube Nominal Size
Insulation
Outer Diameter
in. ⁄ 8 ⁄ 2 3 ⁄ 4 3 1
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 5 6
Tolerance
Inner Diameter
Minus
Plus
in.
mm
in.
mm
in.
mm
0.500 0.625 0.875 1.125 1.375 1.625 2.125 2.625 3.125 3.625 4.125 5.125 6.125
12.7 15.9 22.2 28.6 34.9 41.3 54.0 66.7 79.4 92.1 104.8 130.2 155.6
0.52 0.64 0.89 1.14 1.39 1.64 2.16 2.66 3.16 3.66 4.16 5.16 6.20
13 16 23 29 35 42 55 68 80 93 106 131 157
0 0 0 0 0 0 0 0 0 0 1 ⁄ 32 1 ⁄ 32 1 ⁄ 32
0 0 0 0 0 0 0 0 0 0 0.8 0.8 0.8
in.
mm
⁄ 16 ⁄ 16 1 ⁄ 16 1 ⁄ 16 1 ⁄ 16 1 ⁄ 16 1 ⁄ 16 1 ⁄ 16 1 ⁄ 16 1 ⁄ 16 3 ⁄ 32 3 ⁄ 32 3 ⁄ 32
1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6 2.4 2.4 2.4
1 1
TABLE 3 Outer Diameters of Insulation for Nominal Pipe Sizes (NPS), in. Pipe Nominal Size
Insulation, Nominal Thickness in.
1
1 ⁄ 2
2
21 ⁄ 2
3
mm
25
38
51
64
76
1
⁄ 2 ⁄ 4
3
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 41 ⁄ 2 5 6 7 8 9 10 11 12 14B A B
4
41 ⁄ 2
5
89
102
114
127
8.62 8.62 8.62 8.62 9.62 9.62 10.75 10.75 11.75 11.75 12.75 12.75 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00
9.62 9.62 9.62 9.62 10.75 10.75 11.75 11.75 12.75 12.75 14.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00
10.75 10.75 10.75 10.75 11.75 11.75 12.75 12.75 12.75 14.00 14.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00
11.75 11.75 11.75 11.75 12.75 12.75 14.00 14.00 14.00 15.00 15.00 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00
A
in. 1
31 ⁄ 2
Outer Diameter, in. 2.88 2.88 3.50 3.50 4.00 4.50 5.00 5.56 6.62 6.62 7.62 7.62 8.62 ... ... ... ... ... ... ...
4.00 4.00 4.50 5.00 5.00 5.56 6.62 6.62 7.62 7.62 8.62 8.62 9.62 10.75 11.75 12.75 14.00 15.00 16.00 17.00
5.00 5.00 5.56 5.56 6.62 6.62 7.62 7.62 8.62 8.62 9.62 9.62 10.75 11.75 12.75 14.00 15.00 16.00 17.00 18.00
6.62 6.62 6.62 6.62 7.62 7.62 8.62 8.62 9.62 9.62 10.75 10.75 11.75 12.75 14.00 15.00 16.00 17.00 18.00 19.00
These are identical with pipe outer diameters (see Table 1, Columns 2 and 3). Larger sizes through 36 in., in 1-in. (25.4-mm) increments.
4
7.62 7.62 7.62 7.62 8.62 8.62 9.62 9.62 10.75 10.75 11.75 11.75 12.75 14.00 15.00 16.00 17.00 18.00 19.00 20.00
C 585 – 90 (2004) TABLE 4 Outer Diameters of Insulation for Nominal Pipe Sizes (NPS), mm Pipe Nominal Size
Insulation, Nominal Thickness in.
1
1 ⁄ 2
2
21 ⁄ 2
3
mm
25
38
51
64
76
1
in.
41 ⁄ 2
5
89
102
114
127
219 219 219 219 244 244 273 273 298 298 324 324 356 381 406 432 457 483 508 533
244 244 244 244 273 273 298 298 324 324 356 356 381 406 432 457 483 508 533 559
273 273 273 273 298 298 324 324 356 356 381 381 406 432 457 483 508 533 559 584
298 298 298 298 324 324 356 356 381 381 406 406 432 457 483 508 533 559 584 610
Outer Diameter, mm
⁄ 2 ⁄ 4
73 73 89 89 102 114 127 141 168 168 194 194 219 ... ... ... ... ... ... ...
3
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 41 ⁄ 2 5 6 7 8 9 10 11 12 14B B
4
A
1
A
31 ⁄ 2
102 102 114 127 127 141 168 168 194 194 219 219 244 273 298 324 356 381 406 432
127 127 141 141 168 168 194 194 219 219 244 244 273 298 324 356 381 406 432 457
168 168 168 168 194 194 219 219 244 244 273 273 298 324 356 381 406 432 457 483
194 194 194 194 219 219 244 244 273 273 298 298 324 356 381 406 432 457 483 508
These are identical with pipe outer diameters (see Table 1, Columns 2 and 3). Larger sizes through 36 in., in 1-in. (25.4-mm) increments.
TABLE 5 Outer Diameters of Insulation for Tubes, in. Tube Nominal Size
Insulation, Nominal Thickness in.
1
11 ⁄ 2
2
21 ⁄ 2
3
mm
25
38
51
64
76
⁄ 8 ⁄ 2 3 ⁄ 4 1
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 5 6 A
4
41 ⁄ 2
5
89
102
114
127
... ... 8.62 8.62 8.62 8.62 9.62 9.62 10.75 10.75 11.75 12.75 14.00
... ... 9.62 9.62 9.62 9.62 10.75 10.75 11.75 11.75 12.75 14.00 15.00
... ... 10.75 10.75 10.75 10.75 11.75 11.75 12.75 12.75 14.00 15.00 16.00
... ... 11.75 11.75 11.75 11.75 12.75 12.75 14.00 14.00 15.00 16.00 17.00
A
in. 3
31 ⁄ 2
Outer Diameter, in. 2.38 2.88 2.88 2.88 3.50 3.50 4.00 4.50 5.00 5.56 6.62 7.62 8.62
3.50 3.50 4.00 4.00 4.50 4.50 5.00 5.56 6.62 6.62 7.62 8.62 9.62
4.50 4.50 5.00 5.00 5.56 5.56 6.62 6.62 7.62 7.62 8.62 9.62 10.75
5.56 5.56 6.62 6.62 6.62 6.62 7.62 7.62 8.62 8.62 9.62 10.75 11.75
These are identical with pipe outer diameters (see Table 1, Columns 2 and 3).
5
6.62 6.62 7.62 7.62 7.62 7.62 8.62 8.62 9.62 9.62 10.75 11.75 12.75
C 585 – 90 (2004) TABLE 6 Outer Diameters of Insulation for Tubes, mm Tube Nominal Size
Insulation, Nominal Thickness in.
1
1 ⁄ 2
2
21 ⁄ 2
3
mm
25
38
51
64
76
1
4
41 ⁄ 2
5
89
102
114
127
... ... 219 219 219 219 244 244 273 273 298 324 356
... ... 244 244 244 244 273 273 298 298 324 356 381
... ... 273 273 273 273 298 298 324 324 356 381 406
... ... 298 298 298 298 324 324 356 356 381 406 432
A
in.
Outer Diameter, mm
⁄ 8 ⁄ 2 3 ⁄ 4
60 73 73 73 89 89 102 114 127 141 168 194 219
3 1
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 5 6 A
31 ⁄ 2
89 89 102 102 114 114 127 141 168 168 194 219 244
114 114 127 127 141 141 168 168 194 194 219 244 273
141 141 168 168 168 168 194 194 219 219 244 273 298
168 168 194 194 194 194 219 219 244 244 273 298 324
These are identical with pipe outer diameters (see Table 1, Columns 2 and 3).
TABLE 7 Outer Diameters of Insulation for Nominal Pipe Sizes (NPS), maximum, in. Pipe Nominal Size
Insulation, Nominal Thickness in.
1
11 ⁄ 2
2
21 ⁄ 2
3
mm
25
38
51
64
76
⁄ 2 ⁄ 4
3
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 41 ⁄ 2 5 6 7 8 9 10 11 12 14B A B
4
41 ⁄ 2
5
89
102
114
127
9 9 9 9 10 10 11.13 11.13 12.13 12.13 13.13 13.13 14.38 15.38 16.38 17.38 18.38 19.38 20.38 21.50
10 10 10 10 11.13 11.13 12.13 12.13 13.13 13.13 14.38 14.38 15.38 16.38 17.38 18.38 19.38 20.38 21.38 22.50
11.13 11.13 11.13 11.13 12.13 12.13 13.13 13.13 13.13 14.38 14.38 15.38 16.38 17.38 18.38 19.38 20.38 21.38 22.38 23.50
12.13 12.13 12.13 12.13 13.13 13.13 14.38 14.38 14.38 15.38 15.38 16.38 17.38 18.38 19.38 20.38 21.38 22.38 23.38 24.50
A
in. 1
31 ⁄ 2
Outer Diameter, in. 3.25 3.25 3.88 3.88 4.38 4.88 5.38 6 7 7 8 9 9 ... ... ... ... ... ... ...
4.38 4.38 4.88 5.38 5.38 6 7 7 8 8 9 9 10 11.13 12.13 13.13 14.38 15.38 16.38 17.50
5.38 5.38 6 6 7 7 8 8 9 9 10 10 11.13 12.13 13.13 14.38 15.38 16.38 17.38 18.50
7 7 7 7 8 8 9 9 10 10 11.13 11.13 12.13 13.13 14.38 15.38 16.38 17.38 18.38 19.50
These are identical with pipe outer diameters (see Table 1, Columns 2 and 3). Larger sizes through 36 in., in 1-in. (25.4-mm) increments.
6
8 8 8 8 9 9 10 10 11.13 11.13 12.13 12.13 13.13 14.38 15.38 16.38 17.38 18.38 19.38 20.50
C 585 – 90 (2004) TABLE 8 Outer Diameters of Insulation for Nominal Pipe Sizes (NPS), maximum, mm Pipe Nominal Size
Insulation, Nominal Thickness in.
1
1 ⁄ 2
2
21 ⁄ 2
3
mm
25
38
51
64
76
1
in.
41 ⁄ 2
5
89
102
114
127
229 229 229 229 254 254 283 283 308 308 334 334 365 391 416 441 467 492 518 546
254 254 254 254 283 283 308 308 334 334 365 365 391 416 441 467 492 518 543 572
283 283 283 283 308 308 334 334 365 365 391 391 416 441 467 492 518 543 568 597
308 308 308 308 334 334 365 365 391 391 416 416 441 467 492 518 543 568 594 622
Outer Diameter, mm
⁄ 2 ⁄ 4
83 83 99 99 112 124 137 153 178 178 203 229 229 ... ... ... ... ... ... ...
3
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 41 ⁄ 2 5 6 7 8 9 10 11 12 14B B
4
A
1
A
31 ⁄ 2
112 112 124 137 137 153 178 178 203 203 229 229 254 283 308 334 365 391 416 445
137 137 153 153 178 178 203 203 229 229 254 254 283 308 334 365 391 416 441 470
178 178 178 178 203 203 229 229 254 254 283 283 308 334 365 391 416 441 467 495
203 203 203 203 229 229 254 254 283 283 308 308 334 365 391 416 441 467 492 521
These are identical with pipe outer diameters (see Table 1, Columns 2 and 3). Larger sizes through 36 in. in 1-in. (25.4-mm) increments.
TABLE 9 Outer Diameters of Insulation for Tubes, Maximum, in. Tube Nominal Size
Insulation, Nominal Thickness in.
1
11 ⁄ 2
2
21 ⁄ 2
3
mm
25
38
51
64
76
⁄ 8 ⁄ 2 3 ⁄ 4 1
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 5 6 A
89
4 102
41 ⁄ 2
5
114
127
... ... 11.13 11.13 11.13 11.13 12.13 12.13 13.13 13.13 14.38 15.38 16.38
... ... 12.13 12.13 12.13 12.13 13.13 13.13 14.38 14.38 15.38 16.38 17.38
A
in. 3
31 ⁄ 2
Outer Diameter, in. 2.75 3.25 3.25 3.25 3.88 3.88 4.38 4.88 5.38 5.88 7 8 9
3.88 3.88 4.38 4.38 4.88 4.88 5.38 5.88 7 7 8 9 10
4.88 4.88 5.38 5.38 5.88 5.88 7 7 8 8 9 10 11.13
5.88 5.88 7 7 7 7 8 8 9 9 10 11.13 12.13
These are identical with pipe outer diameters (see Table 1, Columns 2 and 3).
7
7 7 8 8 8 8 9 9 10 10 11.13 12.13 13.13
... ... 9 9 9 9 10 10 11.13 11.13 12.13 13.13 14.38
... ... 10 10 10 10 11.13 11.13 12.13 12.13 13.13 14.38 15.38
C 585 – 90 (2004) TABLE 10 Outer Diameters of Insulation for Tubes, Maximum, mm Tube
Insulation, Nominal Thickness
Nominal Size
in.
1
1 ⁄ 2
2
21 ⁄ 2
3
mm
25
38
51
64
76
1
4
41 ⁄ 2
5
89
102
114
127
... ... 229 229 229 229 254 254 283 283 308 334 365
... ... 254 254 254 254 283 283 308 308 334 365 391
... ... 283 283 283 283 308 308 334 334 365 391 416
... ... 308 308 308 308 334 334 365 365 391 416 441
A
in.
Outer Diameter, mm
⁄ 8 ⁄ 2 3 ⁄ 4
70 83 83 83 99 99 111 124 137 149 178 203 229
3 1
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 5 6 A
31 ⁄ 2
99 99 111 111 124 124 137 149 178 178 203 229 254
124 124 137 137 149 149 178 178 203 203 229 254 283
149 149 178 178 178 178 203 203 229 229 254 283 308
178 178 203 203 203 203 229 229 254 254 283 308 334
These are identical with pipe outer diameters (see Table 1, Columns 2 and 3).
TABLE 11 Approximate Wall Thickness of Insulation for Pipes Pipe Nominal Size
Insulation, Nominal Thickness in.
1
11 ⁄ 2
2
21 ⁄ 2
3
mm
25
38
51
64
76
31 ⁄ 2
4
89
41 ⁄ 2
102
5
114
127
Approximate Wall Thickness in.
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
⁄ 2 ⁄ 4
1.01 0.90 1.08 0.91 1.04 1.04 1.04 1.02 1.30 1.04 1.30 0.99 0.96 ... ... ... ... ... ... ...
26 23 27 23 26 26 26 26 33 26 33 25 24 ... ... ... ... ... ... ...
1.57 1.46 1.58 1.66 1.54 1.58 1.86 1.54 1.80 1.54 1.80 1.49 1.46 1.52 1.52 1.52 1.58 1.58 1.58 1.46
40 37 40 42 39 40 47 39 46 39 46 38 37 39 39 39 40 40 40 37
2.07 1.96 2.12 1.94 2.35 2.10 2.36 2.04 2.30 2.04 2.30 1.99 2.02 2.02 2.02 2.15 2.08 2.08 2.08 1.96
53 50 54 49 60 53 60 52 58 52 58 51 51 51 51 55 53 53 53 50
2.88 2.78 2.64 2.47 2.85 2.60 2.86 2.54 2.80 2.54 2.86 2.56 2.52 2.52 2.65 2.65 2.58 2.58 2.58 2.46
73 71 67 63 72 66 73 65 71 65 73 65 64 64 67 67 66 66 66 62
3.38 3.28 3.14 2.97 3.35 3.10 3.36 3.04 3.36 3.11 3.36 3.06 3.02 3.15 3.15 3.15 3.08 3.08 3.08 2.96
86 83 80 75 85 79 85 77 85 79 85 78 77 80 80 80 78 78 78 75
3.88 3.78 3.64 3.47 3.85 3.60 3.92 3.61 3.86 3.61 3.86 3.56 3.65 3.65 3.65 3.65 3.58 3.58 3.58 3.46
99 96 92 88 98 91 100 92 98 92 98 90 93 93 93 93 91 91 91 88
4.38 4.28 4.14 3.97 4.42 4.17 4.42 4.11 4.36 4.11 4.48 4.18 4.15 4.15 4.15 4.15 4.08 4.08 4.08 3.96
111 109 105 101 112 106 112 104 111 104 114 106 105 105 105 105 104 104 104 101
4.95 4.84 4.71 4.54 4.92 4.67 4.92 4.61 4.36 4.74 4.49 4.68 4.65 4.65 4.65 4.65 4.60 4.60 4.58 4.46
126 123 120 115 125 119 125 117 111 120 114 119 118 118 118 118 117 117 116 113
5.45 5.34 5.21 5.04 5.42 5.17 5.55 5.24 4.99 5.24 4.99 5.18 5.15 5.15 5.15 5.15 5.10 5.10 5.08 4.96
138 136 132 128 138 131 141 133 127 133 127 132 131 131 131 131 127 127 129 126
1 3
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 41 ⁄ 2 5 6 7 8 9 10 11 12 14A A
Larger sizes through 36 in., same as for 14 in.
8
C 585 – 90 (2004) TABLE 12 Approximate Wall Thickness of Insulation for Tubes Tube Nominal Size
Insulation, Nominal Thickness in.
1
1 ⁄ 2
2
21 ⁄ 2
3
mm
25
38
51
64
76
1
31 ⁄ 2
4
89
41 ⁄ 2
102
5
114
127
Approximate Wall Thickness in. ⁄ 8 ⁄ 2 3 ⁄ 4 3 1
1 11 ⁄ 4 11 ⁄ 2 2 21 ⁄ 2 3 31 ⁄ 2 4 5 6
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
0.93 1.12 1.00 0.87 1.06 0.93 0.92 0.92 0.92 0.95 1.23 1.23 1.21
24 28 25 22 27 24 23 23 23 24 31 31 31
1.49 1.43 1.56 1.43 1.56 1.43 1.42 1.45 1.73 1.48 1.73 1.73 1.71
38 36 40 36 40 36 36 37 44 38 44 44 43
1.99 1.93 2.06 1.93 2.08 1.96 2.23 1.98 2.23 1.98 2.23 2.23 2.28
51 49 52 49 53 50 57 50 57 50 57 57 58
2.52 2.46 2.86 2.74 2.62 2.49 2.73 2.48 2.73 2.48 2.73 2.80 2.78
64 62 73 70 67 63 69 63 69 63 69 71 71
3.05 2.99 3.36 3.24 3.12 2.99 3.23 2.98 3.23 2.98 3.30 3.30 3.28
77 76 85 82 79 76 82 76 82 76 84 84 83
... ... 3.87 3.74 3.62 3.49 3.73 3.48 3.80 3.54 3.80 3.80 3.90
... ... 98 95 92 89 95 88 97 90 97 97 99
... ... 4.37 4.24 4.12 3.99 4.30 4.04 4.30 4.04 4.30 4.42 4.40
... ... 111 108 105 101 109 103 109 103 109 112 112
... ... 4.93 4.81 4.68 4.55 4.80 4.55 4.80 4.55 4.92 4.92 4.90
... ... 125 122 119 116 122 116 122 116 125 125 125
... ... 5.43 5.31 5.18 5.06 5.30 5.05 5.42 5.17 5.42 5.42 5.40
... ... 138 135 132 129 135 128 138 131 138 138 137
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