ASTM C450-99e1

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: C 450 – 99
Standard Practice for
Prefabrication and Field Fabrication of Thermal Insulating
Fitting Covers for NPS Piping, Vessel Lagging, and Dished
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Head Segments
This standard is issued under the fixed designation C 450; 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 epsilon (e) indicates an editorial change since the last revision or reapproval.
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e NOTE—Table 1 was removed from the text in April 2001.
1. Scope may be done by cutting, grinding, milling, or molding, depend-
ing upon the method most suitable for the thermal insulation
1.1 This practice provides tables of dimensions of pre-
being fabricated. It is equally applicable for all temperature
formed insulation that may be used in fabricating covers for
ranges.
use on valves, ells, tees, flanges, and vessels in the pressure
range from 150 to 1500 psi (1 to 10 MPa). These tables, which
4. Apparatus
are part of this standard, are published separately as the ASTM
4.1 Thermal insulation can be formed into shapes by nu-
Recommended Dimensional Standards for Prefabrication and
merous methods. In general, insulations may be cut by circular
Field Fabrication of Thermal Insulation Fitting Covers for NPS
or band saws, shaped by grinders or millers, or molded. Each
Piping, Vessel Lagging, and Dished Head Segments. The tables
method has certain advantages and disadvantages, depending
provide dimensions for use in forming pipe fitting covers for
upon the material to be formed, number of cuts required,
NPS pipe operating at high temperature and low temperature
material waste permissible, and quantity of fittings being
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and NPS pipe heat traced with tubing up to ⁄8 in. (16 mm) in
produced. Adhesives and fabrication cements can be applied
outside diameter. The tables also include dimensions for use in
from dip pots, rollers, doctor blades, brush, or trowel, depend-
forming thermal insulation into curved segments, lagging, and
ing upon the materials being used. For these reasons, although
dished heads for application on vessels. This practice does not
standardized equipment may be devised for certain forming
apply to reflective-type insulation.
functions, no completely standardized equipment recommen-
1.2 This standard does not purport to address all of the
dation can be suggested.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Basis of Design
priate safety and health practices and determine the applica-
5.1 All dimensions presented are based on the use of pipe
bility of regulatory limitations prior to use.
insulation manufactured to Practice C 585 and to the Basic
1.3 The values stated in inch-pound units are to be regarded
Dimensional Standards for Pipe Insulation as given in Tables 1
as the standard. The values given in parentheses are provided
and Tables 2 of the ASTM Recommended Dimensional Stan-
for information purposes only.
dards for Prefabrication and Field Fabrication of Thermal
Insulation Fitting Covers for NPS Piping, Vessel Lagging, and
2. Referenced Documents
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Dished Head Segments.
2.1 ASTM Standards:
5.2 The tables provide dimensions for insulation fitting
C 585 Practice for Inner and Outer Diameters of Rigid
covers for installation on nominal pipe size (NPS) pipe
Thermal Insulation for Nominal Sizes of Pipe and Tubing
2 operating at high and low temperatures. Due to differences in
(NPS System)
application requirements in high and low temperature installa-
3. Significance and Use tions, it is necessary that fabrication of covers be different for
each.
3.1 This system of dimensions provides a guide for forming
5.3 An additional set of tables are provided for nominal pipe
thermal insulation in advance of field application. Forming
size (NPS) pipe that is heat traced with parallel tubing or
conduit attached to the pipe. This set of dimensions provides
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This practice is under the jurisdiction of ASTM Committee C16 on Thermal
space for either air convection method or high conductive
Insulation and is the direct responsibility of Subcommittee C16.20 on Homogeneous
Inorganic Thermal Insulations.
Current edition approved September 10, 1999. Published October 1999. Origi-
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nally published as C 450 – 60 T. Last previous edition C 450 – 94. Available at a nominal cost from ASTM Headquarters. Order Adjunct:
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Annual Book of ASTM Standards, Vol 04.06. ADJC0450.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.
...