Victaulic 768N FireLock NXT Series, Инструкция по установке, обслуживанию и испытаниям

Страница: 19 / 34

I-768N / Series 768N FireLock NXT ™ Dry Valve / Installation, Maintenance, and Testing Manual
Ball Drip
(Step 4)
Water Supply
Main Drain
Valve
(Steps 6 & 8)
REQUIRED MAIN DRAIN TEST
Perform the main drain test on a frequency required by the current
NFPA-25 code. The authority having jurisdiction in the area may require
these tests on a more frequent basis. Verify these requirements by
contacting the authority having jurisdiction in the affected area.
1.
Notify the authority having jurisdiction, remote station alarm
monitors, and those in the affected area that the main drain test
will be performed.
2. Confirm that sufficient drainage is available.
3.
Record the water supply pressure and system air pressure.
4. Confirm that there is no leakage from the intermediate valve
chamber. The ball drip on the alarm manifold assembly should not
be leaking water or air.
5. Verify that the system is at the proper air pressure for the local
water supply pressure.
CAUTION
• Use caution to prevent opening the system main drain valve
accidentally.
• Opening the system main drain valve will cause the valve to
operate.
Failure to pipe the system main drain valve to a proper wastewater
drain will result in property damage.
6. Open the water supply main drain valve fully to flush the water
supply of any contaminants.
7.
While the water supply main drain valve is fully open, record
the water supply pressure (from the water supply gauge) as the
r esidual pressure.
8. Close the water supply main drain valve slowly.
9. Record the water pressure established after closing the water
supply main drain valve.
10.
Compare the residual pressure reading to the residual pressure
readings taken in previous main drain tests. If there is degradation
in the residual water supply reading, restore the proper water
supply pressure.
11. Confirm that all valves are in their normal operating positions (refer
to the table below).
Valve Normal Operating Position
Water Supply Main Control Valve Open
Water Supply Main Drain Valve Closed
System Main Drain Valve Closed
Charge Line Ball Valve of the Priming Manifold Assembly Open
Alarm Test Ball Valve of the Priming Manifold Assembly Closed
Isolation Ball Valve for Series 746-LPA Dry Accelerator
(if applicable)
Open
1/4-Turn Vent Ball Valve for Series 746-LPA Dry Accelerator
(if applicable)
Closed
Slow-Fill Ball Valve of the Victaulic AMTA (if applicable) Open
Fast-Fill Ball Valve of the Victaulic AMTA (if applicable) Closed
12. Confirm that there is no leakage from the intermediate valve
chamber. The ball drip on the alarm manifold assembly should not
be leaking water or air.
13. Notify the authority having jurisdiction, remote station alarm
monitors, and those in the affected area that the valve is back in
service. Provide test results to the authority having jurisdiction, if
required.
I-768N_19 REV_C