ASTM D5251-98a
(Practice)Standard Practice for the Operation of the Tetrapod Walker Drum Tester
Standard Practice for the Operation of the Tetrapod Walker Drum Tester
SCOPE
1.1 This practice describes the equipment and operation of the tetrapod Walker for testing pile floor coverings with a thickness of 20 mm (0.8 in.) or less.
1.2 This practice is only applicable to unused pile floor covering of all types which are tested under standard textile conditions.
1.3 This practice may be used by mutual agreement between purchaser and supplier to set purchasing specifications.
1.4 The values stated in inch-pound units are to be regarded as the standard for all measurements except mass. The SI (metric) values for all measurements except mass are provided for information purposes only.
1.5 This practice does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this practice to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D 5251 – 98a
Standard Practice for
the Operation of the Tetrapod Walker Drum Tester
This standard is issued under the fixed designation D 5251; 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.
1. Scope as it is tumbled in the drum. The drum is rotated about its
longitudinal axis for a specified number of revolutions.
1.1 This practice describes the equipment and operation of
the Tetrapod Walker for testing pile floor coverings with a
5. Significance and Use
thickness of 20 mm (0.8 in.) or less because thicker materials
5.1 This equipment may be used to bring about the changes
impede proper operation of the tumbler.
in texture on the surface of pile floor covering caused by
1.2 This practice is applicable for use in testing unused pile
mechanical action.
floor covering of all types. It is not applicable for use in testing
used pile floor covering.
6. Apparatus, Material, and Reagent
1.3 The values stated in either acceptable SI units or in other
6.1 Tetrapod Tumbler Tester
units shall be regarded separately as the standard. The values
6.1.1 Drum—Constructed of a rigid material and capped by
stated in each system may not be exact equivalents; therefore,
a lid that is firmly secured. Each drum is equipped with two
each system must be used independently of the others, without
springs to hold the test specimen in place during testing. The
combining values in any way. In case of referee decisions, the
inner dimensions of the drum are as follows:
SI units shall prevail.
Diameter = 2056 5 mm (8.0 6 0.2 in.)
1.4 This practice does not purport to address all of the
Height = 190 6 5 mm (7.6 6 0.2 in.)
safety concerns, if any, associated with its use. It is the
6.1.2 Tetrapod Walker—A metal casting, tetrahedral in
responsibility of the user of this practice to establish appro-
shape, with four legs placed equidistant from one another. For
priate safety and health practices and determine the applica-
example, the outermost points correspond to the points on an
bility of regulatory limitations prior to use.
equilateral tetrahedron and the large angle between any two
2. Referenced Documents
legs is 2 rad (109.5°). Each leg shall have a replaceable plastic
foot at the end. The free standing height of the tetrapod with 3
2.1 ASTM Standards:
of the 4 plastic feet in one plane is 125 6 2mm(5 6 0.1 in.).
D 123 Terminology Relating to Textiles
The total mass of the tetrapod including the feet is 1000 6 2.5
D 418 Methods of Testing Pile Yarn Floor Covering Con-
g (2.25 6 0.21 lb). The minimum hardness of the plastic feet
struction
supplied by the manufacturer shall be 75 6 5 Type A
D 1776 Practice for Conditioning Textiles for Testing
durometer.
D 5684 Terminology Relating to Pile Floor Coverings
6.1.3 Driving System—Cradles a drum on rollers and keeps
3. Terminology
the axis of the drum level, rotates at 5.2 6 0.2 rad/s (50 6 2
rpm) and has a counter that can be preset to stop the drum after
3.1 Definitions—For definitions of pile yarn floor covering
related terms used in this practice, refer to Terminology any number of revolutions. Drive systems that do not reverse
shall have the direction of rotation shown on the drum.
D 5684. For definitions of other textile terms used in this
practice, refer to Terminology D 123. 6.2 Vacuum Cleaner, upright-type with beater bar.
6.3 Solvent, either ethyl alcohol (CH CH CHOH), or iso-
3 2
4. Summary of Practice
propyl alcohol, [(CH ) CHOH] technical grade.
3 2
4.1 The specimen is secured as the lining of a rotatable
7. Preparation of Specimen
drum with the pile surface exposed. A four legged metal
casting (tetrapod) 8walks’ on the pile surface of the specimen 7.1 Marking the Specimen—Before cutting out the test
specimen, mark on the secondary backing of each specimen the
direction of the pile lay and the direction of the tetrapod“
walk”.
Precision and Bias This practice is under the jurisdiction of ASTM Committee
D-13 on Textiles and is the direct responsibility of Subcommittee D13.21 on Pile
Floor Coverings.
Current edition approved April 10, 1998. Published September 1998. Originally Suitable apparatus is available from the Wira In
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