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3. EQUIPMENT DESCRIPTION
Six of the thirty-three valve test specimens utilized the Nicotef coating and were considered to be representative of the NS8300/8302 generic valve family.
TABLE 3.1 NS-2 TEST SPECIMENS WITH NICOTEF COATING
TEST VALVE NO. 2A 2B 2C
VALVE GENERIC FAMILY
VALVE CATALOG NO.
11A 11B 11C
AC, leaded molded coil, with alternate epoxy, steel body, explosion-proof/ watertight solenoid enclosure, normally open, direct acting 3-way construction with Nicotef metal seating DC, leaded molded coil, with alternate epoxy, brass body, watertight solenoid enclosure, normally closed, direct acting, 3-way construction, Nicotef metal seating, with Electronic Power Reduction module
4. TEST PROGRAM PROCEDURES AND RESULTS
The test items were constructed in accordance with standard ASCO Catalog NS-2 valve assembly and inspection procedures. Following a visual inspection which verified that the valves had not suffered any damage in handling during manufacture, they were subjected to initial baseline tests followed by the qualification test phases, as described below.
4.1 AGING SIMULATION PHASES
The aging portion of the qualification test program consisted of six sequential phases; designed to simulate the most severe expected levels of all potentially degrading conditions associated with both normal and abnormal service.
4.1.1 THERMAL AGING
The valves with the Nicotef coating system were installed in a non-circulating air oven and while energized were subjected to 140 °C for the following times: test specimens 2A and 2C – 2.4 days, test specimen 2B – 4.8 days, 11A and 11C – 11.9 days, and 11B – 23.8 days. Provision was made in the test set-up such that all valves could be energized and pressurized for cycling, as required in the test specification. Cycling during aging is described in section 4.1.2. When the valves were not being cycled, the solenoids were continuously energized at 120 Vac. In addition, maximum operating pressure differential was applied to each valve throughout this test phase.