Xylem Bell & Gossett e-82 Series, Инструкция пользователя

Страница: 6 / 12

3 Operation
3.1 Note on the packed pump operation
See P2004729, Series e-82 Instruction Manual Chapter 5 for more information.
Tighten the gland nuts
Before you start the pump, back off the packing gland nuts or screws until the gland is loose.
Hand tighten until the gland is snug against the first packing ring. Initially, water might freely
run from the packing. This is normal and should be allowed to continue for a period of time
before you continue to tighten the gland. Tighten the gland nuts slowly and one flat at a time.
Leakage rate
An adequate leakage rate is not one single value for all pumps and installations, but is the
amount required to provide adequate cooling and lubrication. The required leakage is
influenced by operating pressure, fluid temperature, shaft speed, and so forth. For fluid
temperatures in the range of 32°F to 190°F (0°C to 88°C), average leakage rates of 60 to 80
drops per minute are recommended. However, each individual pump and installation has
unique operating conditions that result in widely-variable leakage rate requirements.
Maximum fluid temperature
At fluid operating temperatures near the upper limit of 190°F (88°C), the maximum
temperature rise of the leakage is important. Never operate a packed pump with steam
forming at the gland. This limits the temperature rise to a maximum of about 20°F (-7°C). If
the formation of steam persists at higher leakage rates, you must provide cooling water by
means of an external supply, or a heat exchanger used to cool the bypass flush.
3 Operation
4 Series e-82 Packing Seal Instructions INSTRUCTION MANUAL