API SPEC 15LR:2001(2013) pdf downlaod

API SPEC 15LR:2001(2013) pdf downlaod.Specification for Low Pressure Fiberglass Line Pipe.
This appendix covers method of test for the determination of the glass-resin ratio of fiberglass products.
A.2 Summary of Method
The Glass-Resin Ratio Test consists of cutting a 1 inch x I inch sample from the pipe wall, containing it in a crucible, igniting the material, and allowing it to burn until only ash and carbon remain. The carbonaceous residue is reduced to an ash by heating in a muffle furnace at 1050°F (565°C) cooled in a desiccator and weighed.
A.3 Equipment
a. Crucible, made of platinum or porcelain, approximately 30 ml capacity.
h. Electric Muffle Furnace, capable of maintaining a temperature of 10500 ± 50°F (565° ± 28°C).
A.4 Procedure
a. Heat a crucible at 932° to 1112°F (5(I to )0°C) 11r 10 minutes or more. Cool to room temperature in a desiccator and weigh to the nearest 1.0 mg.
b. Place approximately 5 g. of sample in the crucible and weigh to the nearest 1.0 mg. The maximum sue of the sample pieces shall be I in. x I in. x thickness (25.4 x 25.4 mm). Fleat the crucible and sample in a Bunsen flame until the contents ignite. Maintain such a temperature that the sample hums at a uniform and moderate rate until only ash and carbon remain when the burning ceases.
Note I: Ii is ottcn nsenicnt to usc samples obtained from specimens that hae been tested fur mechanical properties such as flexural or tensile strength. The samples must be dry and the fractured ueas removed, leaving square. uiifrayed faces, before these samples are weighed and ignited
Note 2: It is not absolutely necessary to ignite the sample in a Bunsen flame. Instead the crucible and contents can he placed in a muffle furnace at a temperature lower than 1050°F (565°C) and ignited. Care must be taken that there will he no mechanical lass of the noncombustible residue.
Note 3: lIthe “volatile” content of the sample is desired. detenninc the height loss of the crucible and contents after placing in an oven at 212°F (100°C) before ignition. The time ciucible and contents must remain in the oven is dependent on the type of “volatiles” present and the specimen geometry.
c. Heal the crucible and residue in the muffle furnace at 1050° ± 50°F (568° ± 28°C) until all carbonaceous material has disappeared. Cool the crucible to room temperature in adesiccator and weigh to the nearest 1.0 mg.
Note 4: The time for the carbonaceous residue to disappear is depen-dent largely on the sample geometry. It can be up to six hours but isusually much less.
d. Reheat the crucible at 1050°F(565C) for 10 to 20 min-utes,cool in a desiccator and reweigh. Repeat the heating andweighing until consecutive weighings differ by no more than1.0 mg.
e. Determine the ignition loss on at least two more portionsof the same reinforced resin sample.
A.5 Calculations
a.Calculate the ignition loss of the sample as follows.