ASTM G10-10(R2019) pdf free download

ASTM G10-10(R2019) pdf free download.Standard Test Method for Specific Bendability of Pipeline Coatings
1. Scope
1.1 This test method covers the specific determination ofthe effect of short-radius bends on coatings applied to 33.4-mm (1-in. nominal) diameter pipe. 1.2 The values stated in SI units to three significant deci- mals are to be regarded as the standard. The values given in parentheses are for information only. 1.3 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. 1.4 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.
4. Significance and Use
4.1 This test will provide information on the ability of coatings applied to pipe to resist cracking, disbonding, or other mechanical damage as a result of bending. Because the test is applied to coated pipe from commercial production, the results can be directly used in the selection of similar materials for service. The test also has application as a quality control method when variations in coating application or material formulation will affect bending performance.
5. Apparatus
5.1 The bending apparatus shall be essentially as shown in Figs. 1-3 and shall include the following: 5.1.1 Variable-Radius Mandrel, constructed from four 19-mm (0.75-in.) thick pieces of plywood, bolted together and conforming to the geometric shape shown in Fig. 1. The geometric construction is accomplished by laying out along the outer edge of the mandrel a series of seven consecutive arcs at decreasing radii of 610, 530, 460, 380, 300, and 230 mm (24, 21, 18, 15, 12, and 9 in.). The first five arcs shall be carried through a 45-deg angle to the next point of tangency. A 45-deg V-notch shall be cut into the edge ofthe mandrel for seating the pipe specimen. Holes shall be drilled at appropriate locations in the mandrel face for positioning the lever arm and fastening pipe clamps. 5.1.2 Lever Arm-Roller Assembly—A 1.83-m (72-in.) lever arm with nylon roller supplies the mechanical advantage necessary to bend the pipe specimen. The lever arm shall contain a series of holes which are used to maintain proper clearance between the roller and pipe sample during the bending operation. 5.2 Thickness Gage—Measurements of coating thickness will be required for this test. This shall be done in accordance with Test Method G12. 5.3 Holiday Detector—A low-voltage d-c holiday detector of the wet-sponge type, specified in Test Method G6, shall be used to locate breaks in the coating film.
8. Procedure
8.1 Perform the test at a room temperature of21 to 25°C (70 to 77°F). 8.2 Measure the applied coating thickness of each specimen in accordance with Test Method G12. 8.3 The time to execute the test at a uniform velocity should be agreed upon by the producer and the user. 8.4 Place the conditioned test specimen into the V-notch. Secure the pipe in place with clamp No. 1 and tighten the thumb screw. Remove the threaded handle from clamp No. 1 to allow for clearance of the lever arm. With the steel pivot pin at hole A of the lever arm (see Fig. 3), insert the pin into the socket on the bed of the bending jig. Place the nylon roller at position C on the lever arm. Apply the roller to the pipe specimen, and with a constant, even force with the lever handle, bend the pipe around the mandrel until the 460-mm (18-in.) radius bend has been made. Insert and secure pipe clamp No. 2. Continue bending the pipe until the 300-mm (12-in.) radius has been reached. Insert and secure pipe clamp No. 3. Reposition the lever arm by moving the pivot pin to the 25-mm (1-in.) diameter hole in the mandrel surface. Move the nylon roller to position B on the lever arm. Apply the roller to the pipe and complete the bending operation by forming the specimen through the 230-mm (9-in.) radius.