Seeflex Gauge Installation, Operating and Maintenance Instructions. Issue 4. 17.03.2008. G31INS
PAGE 9 OF 24
SEETRU LTD.
ALBION DOCKSIDE WORKS, HANOVER PLACE, BRISTOL BS1 6UT. ENGLAND.
TEL. 0117 927 9204. FAX 0117 929 8193.
INSTALLATION OPERATING &
MAINTENANCE INSTRUCTIONS
NATIONAL
ACCREDITATION
OF CERTIFICATION
BODIES
INSTALLATION INSTRUCTIONS
READ ALL INSTALLATION INSTRUCTIONS BEFORE COMMENCING WORK.
Important note
The Seeflex liquid level gauge is designed to be securely fitted to the side of a tank. Before the gauge is
mounted on the tank it is fragile and must be handled with care. Do not pick the gauge up from one end, when
lifting support the gauge along its entire length. If working on a bench the gauge must be rigidly supported at
least every 1000mm.
Tank Preparation.
Choose a position on the tank which is flat and unobstructed vertically to mount the gauge.
Carefully unpack the gauge and check the valve centre distance (if applicable)
For gauges with a valve at the bottom and either a valve or valveless fitting at the top, mark out two holes on the
tank wall at the same centre distance as the gauge centres. If your gauge has a valve at the bottom only,
mark the bottom hole only. These holes will locate the gauge and so must be positioned vertically.
The bottom hole must be above any known or suspected sludge levels.
Drill a 42mm diameter hole at each marked position.
Remove from the gauge valves from the tank bosses supplied.
Insert the bosses into the holes in the tank and weld into position.
Check that the boss bores are free of weld spatter. These bores may be protected with silicon grease prior to
welding.
Use Arosta 316L-150 (or equivalent) welding rods for mild steel tanks.
All welding must be to the satisfaction of classification surveyor.
Gauge
(see Figure 10 on page 13 and Figure 11 on page 14)
Remove the isolation valves from the gauge by unscrewing the retaining nuts. Take care not to damage the collar
seals.
Screw the isolation valves into the tank bosses after first checking that the bosses are cold.
Support the gauge vertically, slide the gauge collars over the isolation valves (now protruding from the tank).
If the gauge valve centre distance is in excess of 1000mm intermediate supports are supplied. These require
packing plates (supplied) to be welded to the tank.
If present, equally space the support pads along the gauge at not more than 1000mm centres. Tack weld the
pads to the tank.
Loosen the support brackets and remove the gauge from the tank.
Complete the welding of the support pads.
Mount the gauge on the tank and tighten the support brackets. Check collar inner 'O' rings are in position.
Fit the outside ‘O’ rings to the top and bottom isolation valves, screw on the retaining nuts and tighten.
It is possible to adjust the gauge isolation valve centre distance on closed circuit gauges by plus or minus 5mm
by sliding the top gauge collar in or out.
If the top gauge collar is removed completely DO NOT PUSH IT BACK THROUGH THE GLAND, this would
damage the internal seals. If the gauge collar is pulled out follow this procedure;
Remove the gland nut, P.T.F.E. spacer, and ‘O’ ring from the gauge collar housing. Assemble these components
onto the gauge collar stem in this sequence: first, metal gland nut; second, white P.T.F.E. spacer; third, 'O' ring.
Then fit this assembly ino the gauge collar housing. When the collar is in the correct position screw the gland nut
in hand tight.