API 575 - (8) Methods of Inspection

2 external

(FOR AST's ONLY) If water is not available, to determine leaks, an air test may be used under careful conditions at a pressure of ____" of water pressure. Snoop detection liquid would be applied to ______ seams.

preliminary roof bottom

A _______ internal visual inspection should be the first step. The steps are to first inspect the ________, then the shell and ________.

high low

A holiday test of internal tank linings uses _____ voltage, and ______ current.

100

A minimum ____ watt halogen light bulb is typically required for tank bottom inspection.

545 25

API _____ provides info concerning grounding of tanks. The resistance total from tank to earth should not exceed ______ ohms.

dissimilar

Aluminum floating-roof leg supports need to be adequately isolated from bare carbon steel, as per API Appendix H to avoid corrosion by _______ metals.

sunlight

Blisters occur in areas receiving the most _________.

hammer UT

Bolt condition can be verified by VT, tapping with a _________, or by _ _ examination.

freezing

Broken grounding cable between the roof and shell are most common in _______ climates.

hammer UT

Cast iron components of tank interiors should not be tested using a ________, nor with the _ _ NDT method.

150

Caustic corrosion thrives in tanks operating above ______°F.

seam leaks

Coating bond failure commonly occurs below _________ ________.

blister

Coating bond failure is not easily seen unless a _________ has formed or broken.

29 1910 146

Confined space entry is detailed in ______ CFR Part _ _ _ _ . _ _ _

hammer

Crevices can collect water and can be checked by picking with a knife/scraper or tapping them with a __________.

30 30 5 30 swing

Drain lines can be hydro-tested using a two stage hydro-pneumatic test. First stage is ___ lbf/in² for _____ minutes. Second stage is at ___lbf/in² for ____ minutes at to test the ____ joints.

high

During tank roof inspection, tank roof level should be as ______ as possible if volatile liquid is in the tank.

100 lumens

Hydrogen blister inspection should be aided by sufficient candlepower, of at least ______ ______.

prod techniques

If MT is used for detecting cracks while tanks are in-service, current flow (________ _________) should not be used due to danger of sparks.

flame arrestors

If an explosion happens in a tank, ________ _________s should be immediately checked for damage.

heating coils

If caustic or amine is stored in a tank, it should be checked around connections for internal _____ units or _________.

sink

If drains are blocked on floating roofs, it may cause the roof to _______.

pyrophoric

Inspectors should be aware of accumulation of dry _________ material (self-igniting material when exposed to ambient air).

shaded

Insulation core samples may be removed, especially on the ______ side of the tank, to determine condition.

sounding

Ladders, stairways and handrails may be checked by VT and by ____________ to determine safe use.

soil thin

MFL scanning is capable of detecting _____-side corrosion, even through _____ film coatings.

multi echo thin

Modern UT _______-_______ thickness scopes allow metal thickness readings to be taken through _______ film coatings.

liquid

On float-type gauges, the float should be inspected to ensure it doesn't contain _______.

hammer

Outside stiffeners and wind girders of a tank can be inspected by VT and by ________ testing.

tubular inside

Particular attention should be given to ________ handrails which may have corroded from the _________.

29 1910

Platforms, elevated walkways and external floating roof wind girders used as walkways should be evaluated per OSHA as detailed in _ _ CFR Part _ _ _ _

12 12 rounded

Roof coupons should be ___" x ___" in size, and have ________ corners.

saturate low frequency eddy current

SLOFEC stands for:

cfr 1910

Stairways and ladder inspection is detailed in 29 _ _ _ Part _ _ _ _

caliper UT

Steel columns can be measured with ___________s and checked against original thickness to determine corrosion or loss. However, ____ is more efficient and accurate.

UT MFL

Tank bottom inspection has advanced from coupon cutting, to _ _, coupon cutting, electronic profiling, and _ _ _ scanning methods.

2015 2016

Tank entry and re-entry are detailed in API _______ and API _________.

MFL

Tank floors should be inspected over its entire area. The most common method is _ _ _ scanning.

7

Tanks built to API 650 prior to the ___th (use digit) edition may have been built with incomplete penetration of circ shell weld seams.

hydro

Tanks that have been lifted should be ______ tested or subject to engineering evaluation.

first

The ______ outside valve on all connections should be inspected.

low air

The best way to find roof leaks is with a _____-pressure ____ test.

before

Thickness measurements on tank roofs should be done ________ the tank bottom has been cleaned.

0.2 10

Typically, ____% to ____% of a tank bottom should be scanned randomly.

nozzle

Visual or eccentric measurements should be performed on flanges and _________s.

24 uncoated

When obtaining shell thickness, special attention should be given to the upper ____" of ________ shells of floating roof tanks.

both sides

Why are the uppermost areas of the shell most susceptible to corrosion? Because they are exposed to the atmosphere on ______ ______.