FED-STD-791D
the other to the pyrometer or temperature recorder.
Two bare-wire
thermocouples are provided for measuring "oil-in" temperature. One is
connected to the off-on temperature controller, the other to the pyrometer or
temperature recorder. One bare-wire thermocouple, connected to pyrometer or
temperature recorder, is provided for measuring "oil-out" temperature. A
thermocouple, design optional, is used to measure the test section air
temperature and is connected to the pyrometer or temperature recorder.
d.
Test section. The test section components and their approximate location are
shown in Figure 2. A schematic drawing of the entire rig is shown in Figure 3.
The test section components are mounted on a rack that can be removed from
the cabinet to permit easy disassembly for cleaning. A spare test section can be
advantageously utilized to keep down-time on the rig to a minimum
e.
Coking tube. The coking tube consists of an aluminum tube with a shrunk-in
1500-watt cartridge heater. Two thermocouple holes are provided. The
configuration and dimensions of the coking tube are shown in Figure 4.
f.
Line filter. The filter consists of a two-piece body, a 100-mesh stainless steel
screen, and a screen support. These components are shown assembled in Figure
5.
g.
Oil cooler. The oil cooler is designed for oil downflow through annular space
and water upflow through the inner tube. A continuous water bleed to waste is
taken through an orifice just ahead of the inlet to the cooler (see Figure 2, item
32). This acts as a drain for the cooler when the water flow is shut off by the
control, air being bled back into the cooler through a check valve (see Figure 2,
item 30).
4.2 Balance, capacity 500 g, sensitivity 10 mg.
4.3 Stop watch, accuracy 0.1 s.
4.4 Wet test gas meter.
4.5 Brushes, metal, special; 0.195 in diameter, 1/2 in B.P., 10 in; P.A. No. 22
single stem 0.0025 fill (Mill-Rose Co., 1985 East 59th Street, Cleveland, OH).
4.6 Holding fixture, coking-tube (for supporting coking tube by top end without
marring or distorting the tube).
4.7 Oven, 99 to 104.4C (210 to 220F).
4.8 Thermometer, platinum-resistance or a thermometer certified by the Bureau
of Standards (for weekly check of thermocouples at normal operating temperature).
4.9 Compressed-air source.
4.10 Millivoltmeter (precision potentiometer).
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