ASTM-C335 2010

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C335/C335M-10e1 Standard Test Method for Steady-State Heat Transfer Properties of Pipe Insulation

Published By	Publication Date	Number of Pages
ASTM	2010	14

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Categories: 91.100.60 - Thermal and sound insulating materials, ASTM

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Description

1.1 This test method covers the measurement of the steady-state heat transfer properties of pipe insulations. Specimen types include rigid, flexible, and loose fill; homogeneous and nonhomogeneous; isotropic and nonisotropic; circular or non-circular cross section. Measurement of metallic reflective insulation and mass insulations with metal jackets or other elements of high axial conductance is included; however, additional precautions must be taken and specified special procedures must be followed.

1.2 The test apparatus for this purpose is a guarded-end or calibrated-end pipe apparatus. The guarded-end apparatus is a primary (or absolute) method. The guarded-end method is comparable, but not identical to ISO 8497.

1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.4 When appropriate, or as required by specifications or other test methods, the following thermal transfer properties for the specimen can be calculated from the measured data (see 3.2):

1.4.1 The pipe insulation lineal thermal resistance and conductance,

1.4.2 The pipe insulation lineal thermal transference,

1.4.3 The surface areal resistance and heat transfer coefficient,

1.4.4 The thermal resistivity and conductivity,

1.4.5 The areal thermal resistance and conductance, and

1.4.6 The areal thermal transference.

Note 1In this test method the preferred resistance, conductance, and transference are the lineal values computed for a unit length of pipe. These must not be confused with the corresponding areal properties computed on a unit area basis which are more applicable to flat slab geometry. If these areal properties are computed, the area used in their computation must be reported.

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PDF Pages	PDF Title
1	Scope
2	Referenced Documents TABLE 1
3	Terminology
4	Significance and Use
5	Apparatus FIG. 1
6	FIG. 2
7	Test Specimen
8	Conditioning
9	Procedure End Cap Corrections
10	Calculation Report
11	Precision and Bias Keywords A1. MEASUREMENT UNCERTAINTY A1.1
12	A1.2 Error Components A1.3 Effect of Drift of the Metered Area Heater A1.4 Power Determination Error A1.5 Temperature and Temperature Difference
13	REFERENCES

Additional information

Standard Title	C335/C335M-10e1 Standard Test Method for Steady-State Heat Transfer Properties of Pipe Insulation
Published Code	ASTM
Publication Date	2010
Pages Count	14
ICS Codes	91.100.60 - Thermal and sound insulating materials

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ASTM-C335 2010

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