Home>ASTM Standards>ASTM F1804-08(R2020) pdf free download

ASTM F1804-08(R2020) pdf free download

ASTM F1804-08(R2020) pdf free download.Standard Practice for Determining Allowable Tensile Load for Polyethylene (PE) Gas Pipe During Pull-In Installation
1. Scope
1.1 This practice provides a means to determine an allow- able tensile load (ATL) value for a polyethylene gas pipe that is to be installed underground using methods that pull the pipe into a trench (cut or plowed), bore hole, casing pipe, or the like. The ATL value takes into account pipe size, tensile yield strength, pipe temperature, and pulling load duration. 1.2 The ATL is used to set the break-away strength for a “weak-link” device, or as a limit setting for other devices that control the maximum pulling force exerted by equipment used to pull polyethylene gas pipe into an underground location, or to determine if pulling equipment can extert pulling force greater than the ATL value for the gas pipe being installed. A weak-link device is installed where the pipe pulling equipment is connected to the polyethylene gas pipe. If pulling load exceeds the ATL limit, the device de-couples the pipe from the pulling equipment. Other measures or equipment that limit the pulling force on the pipe are also used. When the ATL value is compared to the pulling force developed by the pull-in instal- lation equipment and equipment cannot extert pulling force greater than the ATL value, a weak-link or other device for limiting the pulling force is not necessary. 1.3 This practice does not address weak-link device design or requirements, nor does it address the design or requirements for other equipment or procedures used to limit the pulling force applied to polyethylene gas pipe during pull-in installa- tion. 1.4 This practice does not address installation methods or procedures employed for pull-in of polyethylene gas pipe. 1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.7 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Unless otherwise indicated, abbreviations are in accor- dance with Terminology D1600, and terms are in accordance with Terminology F412. 3.2 allowable tensile load (ATL), n—The maximum tensile load applied to a polyethylene gas pipe during pull-in instal- lation that does not result in an unrecoverable tensile elonga- tion of the pipe. N OTE 1—Polyethylene gas pipe materials are visco-elastic, that is, they exhibit properties associated with both elastic materials such as rubber, and viscous materials such as wax or clay. When subjected to a tensile load that is significant, but less than the yield strength, polyethylene will elongate or stretch. If the load is then removed, polyethylene will, over time, recover all or part of the elongation, depending upon the magnitude of the load, and the length of time the load was applied. For the purposes of this practice, elongation that is not completely recovered in about 24 h after the load is released, is considered unrecoverable.
5. Procedure
5.1 The following information about the polyethylene gas pipe is required: size (outside diameter), dimension ratio, material tensile yield strength, the approximate temperature of the pipe at the time of installation, and the approximate time under tension during installation. 5.1.1 Pipe size, dimension ratio, and material shall be in accordance with Specification D2513. 5.1.2 The pipe material tensile yield strength per Test Method D638 at 2 in./min (50.8 mm/min) and 73 6 3 °F (23 6 1.8 °C) is obtained from the pipe manufacturer, or is deter- mined by testing representative samples of the pipe material in accordance with Test Method D638.

Maybe you like

Standards Tags