IEEE Std 515-2017 pdf download
IEEE Std 515-2017 pdf download.IEEE Standard for the Testing, Design,lnstallation, and Maintenance of Electrical Resistance Trace Heatingfor Industrial Applications.
The apparatus is intended to be located in a room temperature environment. The platen(s) shall be sized to expose all parts of the trace heater samples, which would be exposed under normal installation conditions, to the temperature levels required by this procedure. The test apparatus shall verify that the trace heater samples are in intimate contact with the platen. The test apparatus may be supplied with a sample mounting fixture. Offsets may be built into the fixture or platen(s) to accommodate end termination/power transition fittings/boots, if provided. where their size profile exceeds the trace heater profile. The apparatus shall allow energizing of the trace heater samples as required during the test procedure.
The samples shall be thermally insulated on the side not facing the platen so as to improve effective heat transfer from the platen to the trace heater samples.
The temperature of the platen(s) shall be uniformly controlled to a maximum tolerance of ±5 °C for platen temperatures less than 100 °C or 5% of the maximum continuous operating temperature if above 100 °C.
The platen described above may be a flat metal plate, a metal pipe, or a metal surfce typical of the majority of applications for the trace heater being tested.
The trace heater samples shall be within the upper half of the manufacturer’s declared thermal output tolerance, as determined by 4.1.11 b). For trace heaters that are irregular in shape, and for surface heaters, the sample shall consist ofat least one heating unit.
If the trace heaters are part of a trace heater product range, with common materials (with materials having the same performance ratings) and construction, that have different levels of rated voltages and power outputs, then three samples of each of the following shall be selected (for a total of six samples):
The lowest rated voltage level and the maximum rated power output
The highest rated voltage and the minimum rated power output
Trace heater samples may be conditioned, at the maximum rated voltage, for up to 150 h at the manufacturer’s declared maximum continuous operating temperature prior to starting the test.
The trace heater samples, having a minimum length of at least 0.3 m, shall be installed on the sample mounting fixture or directly applied to the platen. The samples shall be powered at the maximum rated voltage. The temperature of the platen shall be 23 ± 5 °C. The initial power output of the samples shall be determined by measuring voltage and current after the fixture has reached equilibrium.
The trace heater samples of continuous parallel construction, while still installed on the sample mounting fixture or platen and energized at the maximum rated voltage, shall be temperature cycled by alternately exposing the samples to platen(s) temperatures corresponding to 23 ± 5 °C and the maximum continuous operating temperature. The samples may be de-energized during the transition from the hot to the cold platen.
The trace heater samples of zone type parallel construct ion shall be temperature cycled in the same manner with the exception that the samples shall be de-energized when not being held at the maximum continuous operating temperature.
If the cycle temperature range exceeds 350 °C, the lower temperature may be set at 350 °C below the maximum continuous operating temperature.
4.1.7 Deformation test
A sample approximately 450 mm in length is placed on a rigid flat steel plate. A crushing force of 1500 N is then applied for 30 s, without shock, by means of a 6 mm diameter steel rod with hemispherical ends and a total length of 25 mm. For the test, the steel rod is laid flat on the sample at a right angle. In the case of a surface heater, the steel rod shall rest across the active element.
After the deformation load is applied for 30 s, conformity is verified by testing the electrical insulation in accordance with 4.1 . I and 4. 1.2 while the horizontal steel rod is still in place on the sample and the load applied.
4.1.8 Impacttests
Both of the impact tests in 4. 1 .8. 1 and 4. I .8.2 are required to be conducted on separate samples of trace heating devices approximately 450 mm in length and on any integral components assembled with the trace heating device.
4.1.8.1 Minimum temperature impact test
A sample is placed on a hardened steel plate (with a mass equal to or greater than 20 kg, 195 mm x 1 95 mm
70 mm). The plate is positioned on a rigid substrate such that the impact energy absorbed by the substrate is negligible. The assembly is then conditioned for a minimum of 4 h at the manufacturer’s minimum installation temperature. The apparatus used for this test is shown in Figure 2.
