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is normal. Isolate the turbine case from the pressure source and monitor the
pressure decay. Typical pressure decay over a minute is 69-103 kPa (10-15
psig). A slight hissing sound may be audible from the GTS seals.
7.3
If the turbine operates at a higher back pressure, the turbine can be
pressurized accordingly if there is sufficient pressure source and the test
flanges, etc. are rated as such. It is normal for the pressure to decay more
quickly at higher pressures.
7.4
Conduct a rotational test of the turbine with back pressure on the seals set
at minimum 345 kPa (50 psig). The shaft speed should be a minimum 800
rpm for this test. Do not conduct the rotational test at less than 345 kPa
(50 psig), this could result in seal face contact and damage. Rotational
testing is generally a short duration to check overall equipment assembly.
7.5
After rotational testing, repeat step 6.2 and compare pressure decay
results. Pressure decay results should be equal.
8
Repairs
This product is a precision sealing device. The design and dimension tolerances
are critical to seal performance. Only parts supplied by Flowserve should be used
to repair a seal. To order replacement parts, refer to the part code and B/M
number. A spare backup seal should be stocked to reduce repair time.
When seals are returned to Flowserve for repair, decontaminate the seal
assembly and include an order marked "Repair or Replace." A signed
certificate of decontamination must be attached. A Material Safety Data
Sheet (MSDS) must be enclosed for any product that came in contact with
the seal. The seal assembly will be inspected and, if repairable, it will be rebuilt,
tested, and returned.
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