Babbitt Liquid Level Gauge User Manual
Page 5
REMOVING THE GAGE FROM SERVICE
To remove the gage from service, the following steps should be followed carefully:
1.
Close the BOTTOM process connection vale to prevent further filling of the gage.
Then close the TOP process connection valve to completely isolate the gage from the
process pressure.
2.
Attach proper vapor collection equipment to the gage vent connection if required.
Open the top vent to relieve pressure in the gage and allow air to flow when the
bottom drain is opened.
3.
Attach the proper liquid collection equipment to the bottom drain and remove liquid. After
all process fluid is out of the gage, the gage is then ready to be removed from service.
ROUTINE MAINTENANCE
Standard Babbitt gages have 1/2 inch vent and drain plug in the top and bottom of the float
chamber to allow cleaning and removal of the process fluid as required.
Some gages are
connected by the customer to a solvent or steam line which allows them to decontaminated or
“blown down” periodically without taking the gage out of service or removing the drain flange and
float. Babbitt gages should be cleaned and inspected at least on an annual basis, or more
frequently depending on the severity of the process. To perform maintenance and clean gage,
follow these procedures:
1.
Block in the float and chamber with the process connection valves or wait until the
vessel is empty or out of service. Follow the steps on previous page for “Removing
The Gage From Service”.
2.
When all the fluid has been drained from the gage chamber, remove the drain flange
and let the float slide out of the chamber. Be sure to examine the float for excessive
wear and clean as required.
3.
Clean the inside wall of the chamber with a “bottle brush” or similar scrubbing tool.
Some processes may dictate the use of suitable solvent for cleaning.
4.
If the gage is located when the bottom drain is near the floor or other equipment
where it is difficult to reach, it is possible to order gages with a top flange in place of
the standard vent plug, or the drain flange may be mounted to the top instead of the
bottom. This allows the gage to be cleaned and serviced through the top end.
5.
After cleaning the chamber, replace the float and drain flange. A new flange gasket
may be required. (Note: Make sure to use gaskets compatible with the process fluid
if replaced.)