ASTM C320-55

Specification for 85 Percent Magnesia Thermal Insulation (Withdrawn 1962)

General Information

• Status: Withdrawn
• Technical Committee: C16 - Thermal Insulation

Standards Content (Sample)

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Standard Specifications for
85 PER CENT MAGNESIA MOLDED-TYPE THERMAL
1
INSULATION FOR PIPES
•
ASTM Designation: C 320 - 55
ADOPTED, 1955.2
This Standard of the American Society for Testing Materials is issued under
the fixed designation C 320; the final number indicates the year of original
adoption as standard or, in the case of revision, the year of last revision.
Scope pipes shall contain not less than 85 per
cent by weight of hydrated basic mag­
1. These speci:fi.ca tions cover the com­
nesium carbonate, reinforced with min­
position, sizes, dimensions, and chemical_
eral fiber.
and physical properties of 85 per cent
magnesia molded-type thermal insula­
Physical Requirements
tion for pipes intended for use on-surfaces
operating at temperatures up to ap­
4. The insulation shall conform to the
proximately 600 F. For specific applica­
following physical requirements:
tions, the actual temperature limit shall
Density (average), max, lb per cu ft . 14.0
be agreed upon between the manufac­
Thermal conductivity (average), max,
turer and the purchaser.
Btu in. per hr sq ft deg Fahr:
At mean temperature of 200 F. . . . . . . 0 .46
Definitions
At mean temperature of 300 F. . . . . . . 0. 50
2. The Standard Definitions of Terms
At mean temperature of 400 F. . . . . . 0. 53
Linear shrinkage (average), after heat
Relating to Thermal Insulating Ma­
soaking, max, per cent. . . . . . . . . . . . 2. 0
3
terials (ASTM Designation: C 168) shall
be considered as applying to the terms
NOTE.-If :flexural strength or compressive
used in these specifications. strength values are required, approximate values
may be secured by testing block from the same
Chemical Requirements
shipment a·s the pipe insulation. The specified
limits for these properties and the methods of
cent magnesia
3. Eighty-five per
test shall conform to the Standard Specifications
molded-type thermal insulation for
for 85 Per Cent Magnesia Block-Type Thermal
1 Under the standardization procedure of the
Insulation (ASTM Designation: C 319).a
Society, these specifications are under the juris­
diction of the ASTM Committee C-16 on
Standard Shapes, Sizes, and Dimensions
Thermal Insulating Materials.
2 Prior to adoption as standard, these specifi~
5. (a) Eighty-:G.ve per cent magnesia
(lations were 'published as tentative from 1953 to
1955. molded-type thermal insulation for
3 Appears in this publication, see Contents
pipes shall be supplied either as hollow,
in Numeric Sequence of ASTM Designations at
cylindrical' shapes split in half length-
front of book.
988

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MAGNESIA T~RMAL INSULATION FOR PIPES (C 320 - SS) 989
wise (in a plane including the cylip.drical
lot. The following table shows the num­
axis) or as curved segments.
ber of pieces to ·be selected from ship­
(b) The pipe insulation shall be fur­
men ts of various sizes:
nished in a length of 36 in. to fit nominal
Number of Pieces
Number of Pieces
pipe sizes ! to 33 in. in diameter. In­
in Shipment to be Selected
dividual dimensions shall conform to
Oto 100 . 0
those specified by the manufacturer.
101 to 500. 1
501 to 1 000. 2
1 001 to 8 000 . . . . . . . . . . . . . . . . 10
· Dimensional Tolerances
8 001 to 27 000. ~ . . . . . . . . . . . . . . 15
27 001 to 64 000 . , . 20
6. The average measured length,
inside diameter, and thickness of any
Additional pieces may be selected at the
individual shape or segment of the
discretion of the inspector, at the pur­
insulation shall not differ from the
chaser's expense. When a lot contains
manufacturer's standard dimensions by
material of more than one size, a repre­
more than ±l in.
sentative choice of sizes and thicknesses
Finish shall be included among the pieces
selected.
7. Cotton jackets shall be furnished
. (c) Sampling Small Lots.-Testing of
on all orders, unless another finish · is
small lots is at the discretion of the pur­
specified by the purchaser.
chaser; however, one half the number of
pieces selected on larger lots will be
Workmanship
sufficient to test for other requirements.
8. Since several requirements for this
(d) ldentiftcation.-Each sample piece
rµaterial are not easily defined by a
shall be marked so that it may be iden­
numerical value but affect the work­
tified at any time.
manship of a finished job, the insulation
shall not have visual defects that will
Methods of Test
adversely affect the service quality. For
example, air holes, cracks, warpage, and 10. The properties enumerated in
bad ends, when excessive, shall be these specifications shall be determined
avoided. in accordance with the following
methods:
Sampling
(a) Conditioning.-Preceding a test,
the test specimens shall be conditioned
9. (a) From each shipment of the
by dr)r
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