1、 The following commercial specification is originally adopted from the military document. Revision A includes all known accepted revisions, amendments, notices, and Department of Defense (DoD) engineering changes previously developed for this item. Revision B and forward include changes adopted to r
2、eflect technology and design evolution. LENGTH PER UNIT WEIGHT; CORDAGE 1. SCOPE 1.1 This method is intended for determining the length-weight relationship of natural and synthetic fiber cordage. 2. TEST SPECIMEN 2.1 The test specimen size shall be as specified below: SPECIMEN SIZE Specimen Length (
3、Minimum) Feet Meters Cordage - less than 3 inches (76 mm) in circumference 10 3.0 Cordage - 3 inches (76 mm) to 6 inches (152 mm) inclusive in circumference 5 1.5 Cordage - over 6 inches (152 mm) in circumference 3 0.91 3. NUMBER OF DETERMINATIONS 3.1 Unless otherwise specified in the procurement do
4、cument, one determination shall be made on each sample unit. 4. APPARATUS 4.1 Tension apparatus. Any suitable device may be used for required load. 4.2 Balance. A balance capable of weighing the specimen to an accuracy of 0.25 percent of the specimen weight. 4.3 Measurement stick or metal tape. Yard
5、stick, meterstick, metal tape or other suitable measuring device graduated in increments of 1/16 inch (1 mm). PIA-TEST METHOD-6004C 25 November 2013 Superseding PIA-TEST METHOD-6004B 24 May 2010 DISTRIBUTION STATEMENT: All Rights Reserved. No Part of this publication may be reproduced without prior
6、written permission from Parachute Industry Association. Additional copies may be purchased on-line from PIA Specifications and Products at: . Copyright Protected: Do Not Copy!PIA-TEST METHOD-6004C 5. PROCEDURE 5.1 Care should be exercised in removing the specimen without alteration of the turns in t
7、wisted, braided or plaited construction. 5.2 Tension a suitable length of the cordage with a weight equal to 1 percent of the minimum breaking strength specified for the cordage. The appropriate length as specified in 2.1 shall be marked to the nearest 1/16 inch (1 mm) on the cordage within 2 minute
8、s of the application of tension. 5.3 Relax the tension on the cordage and cut out the specimen as marked. 5.4 The test specimen shall then be weighed to 0.25 percent of its weight and the weight “W” recorded. 5.5 Calculation. 5.5.1 Length per unit weight shall be calculated as follows: L = Length pe
9、r unit weight W Where: L = Length of specimen in yards, feet or meters, as applicable. W = Weight of specimen in pounds or kilograms, as applicable. 6. REPORT 6.1 The length per unit weight shall be reported to the same accuracy as the specified requirement. * Notice: This document has been adopted
10、from the original FED-STD-191 TEXTILE TEST METHOD of the same number, and is being maintained as a commercial specification by the Parachute Industry Association. Orders, inquires and comments should be addressed to PIA, Specification Committee via e-mail at: or to our website at: . Copyright 2005-
11、2013 Parachute Industry Association. Disclaimer: This document is published by the PIA to provide technical and engineering standards that can be used for reference by all those who may benefit from them. The use of this document is entirely voluntary, and its applicability and suitability for any p
12、articular use, including any patent or trademark infringement arising there from, is the sole responsibility of the user. The original Government document was scanned. The PIA reviews each technical publication periodically, at which it may be reaffirmed, revised, or canceled. The PIA invites your written comments and suggestions. Page 2 of 2 Copyright Protected: Do Not Copy!
