UFC 3-460-03
21 JANUARY 2003
8. Check welds on shell-mounted davit clips above
ٱ
152-mm (6-in) and larger valves.
Autogauge System
1. Inspect autogauge tape guide and lower sheave
ٱ
housing (floating swings) for leaks.
ٱ
2. Inspect autogauge head for damage.
3. Bump the checker on the autogauge head for proper
ٱ
movement of the tape.
4. Ask the operator if the tape tends to hang up during
ٱ
tank roof movement (floating roof tanks).
5. Compare actual product level to the autogauge reading
ٱ
(maximum allowable variation is 51 mm [2 in]).
6. On floating roof tanks, when the roof is in the lowest
ٱ
position, check that no more than 0.6 m (2 ft) of tape are
exposed at the end of the tape guide.
7. Inspect the condition of board and legibility of board-
ٱ
type autogauges.
ٱ
8. Test freedom of movement of marker and float.
Shell-Mounted Sample Station
1. Inspect sample lines for valve function and line
ٱ
plugging, including return-to-tank line drain.
2. Check circulation pump for leaks and operating
ٱ
problems.
3. Test bracing and supports for sample lines and
ٱ
equipment.
ROOFS
Deck Plate External Corrosion
Inspect roof deck for paint failure, holes, pitting, and
corrosion product.
Roof Deck Drainage
Look for evidence of standing water. (Significant sagging
of fixed-roof deck shows potential rafter failure. Large
ٱ
standing water areas on a floating roof show inadequate
drainage design, or, if to one side, a non-level roof with
possible leaking pontoons.)
Roof Insulation
1. Inspect for cracks or leaks in the insulation weather
ٱ
coat where runoff water could penetrate the insulation.
ٱ
2. Inspect for wet insulation under the weather coat.
151
Previous Page
