UFC 3-460-03
21 JANUARY 2003
3. Remove small test sections of insulation and check
ٱ
roof deck for corrosion and holes near the edge of the
insulated area.
ROOF APPURTENANCES
Sample Hatch
1. Inspect condition and functioning of sample hatch
ٱ
cover.
2. On tanks governed by Air Quality Monitoring District
ٱ
rules, check the condition of the inside hatch cover seal.
3. Check thief and hatch gauge cover for corrosion and
ٱ
plugging.
4. Where a sample hatch is used to reel gauge stock level,
ٱ
check for marker and tab stating hold-off distance.
5. Check reinforcing pad where sample hatch pipe
ٱ
penetrates the roof deck.
6. On floating roof sample hatch and recoil systems,
ٱ
inspect operation of recoil reel and condition of rope.
ٱ
7. Test system operation.
Gauge Well
1. Inspect visible portion of the gauge well for thinning,
ٱ
size of slots, and cover condition.
2. Check for hold-off distance marker and tab with hold-
ٱ
off distance (legible).
3. On floating roofs, inspect condition of roof guide for
ٱ
gauge well, particularly the condition of the rollers for
grooving.
4. If accessible, check the distance from the gauge well
ٱ
pipe to the tank shell at different levels.
5. If tank has a gauge well washer, check valve for leaks
ٱ
and for presence of a bull plug or blind flange.
Fixed Roof Scaffold Support
Inspect scaffold support for corrosion, wear, and
ٱ
structural soundness.
Autogauge Inspection Hatch and Guides (Fixed Roof)
ٱ
1. Check the hatch for corrosion and missing bolts.
2. Look for wire anchor corrosion on the tape guide and
ٱ
float guide.
Autogauge Float Well Cover
ٱ
1. Inspect for corrosion.
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