API 1604 Closure of Underground Petroleum Storage Tanks Flashcards by Jamie Mayhue

What are the symptoms of inhaling high concentrations of petroleum hydrocarbon vapors?
(API 1604, Section 1.3.1)

Dizziness to Excitement to Unconciousness

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What is the first step in treating the minor effects of exposure to petroleum hydrocarbon
vapors? (API 1604, Section 1.3.1)

Fresh Air, Oxygen

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List six safe work practices closure personnel should follow to reduce health risks at a
closure site. (API 1604, Section 1.3.1)

Avoid Contact with Skin
Keep away from Eyes and mouth
Use Soap and Water to Clean Skin
Wash Clothes
Keep Work area clean and ventilated
Clean up spills

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What component of leaded gasoline can cause diseases of the nervous system, the kidney
and the blood? (API 1604, Section 1.3.1.2)

tetraethyl Lead

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What is a major route of entry of tetraethyl lead into the body? (API 1604, Section 1.3.1.2)

Skin

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What are three types of precautions that must be taken to prevent the accidental ignition of
explosive vapors at a tank removal site? (API 1604, Section 1.3.2.1)

Restrict or Eliminate Ignition Source
Prevent Static Electricity
Prevent Accumulation of Vapors

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Under what circumstances is an UST considered to be temporarily out of service? (API
1604, Section 2.1)

Idle but will be returned to service

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How long can a UST that meets regulatory standards for a new or upgraded system remain
temporarily out of service? How long can a UST that does not meet regulatory standards
stay out of service? What is required for an out of service UST that does not meet
regulatory standards to obtain an extension of the out of service period? (API 1604,
Section 2.1)

12 Months

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What are six steps that should be taken to properly secure a tank that is to be temporarily
out of service? (API 1604, Section 2.2)

Cap and secure all openings
Signs or placards
Electric lock out
hydrostatic test
Registration

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How much product should be left in a tank in order to maintain a saturated vapor space
when a tank is being placed temporarily out of service? (API 1604, Section 2.2

1 inch

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What are four elements of a pre-closure evaluation that should be conducted prior to
permanent closure or change-in-service? (API 1604, Section 3.3.1)

30 days- potential contamination
Dewater required yes or no
Stockpiling area
Area for garbage

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During the closure operation, what should be done with the contents of the product
piping? (API 1604, Section 4.2.2

Vac out and flush

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If pumps are used to remove liquids and residues from an underground tank, what
precaution must be taken to prevent electrostatic ignition hazards? (API 1604,
Section 4.2.3

Bonding

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If a vacuum truck is used for removal of liquids or residues from an underground tank:
(API 1604, Section 4.2.3

The area of operation of the vacuum truck must be __vapor free_____ .
The truck should be located Down wind from the tank.
Vacuum pump exhaust gases should be discharged through a hose of adequate size and length Downwind of the truck and tank area

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When closing tanks, after all the liquid product has been removed, what is the next step?
(API 1604, Section 4.2.4)

Excavation top of tank

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After removing product and exposing the top of the tank, what is the next step in closing a
tank? (API 1604, Section 4.2.5)

Tank fixture removed

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Once the top of the tank has been excavated and tank fixtures removed, all tank openings
should be plugged except one. Which pipeline should remain connected to the tank? (API
1604, Section 4.2.5)

Vent LIne

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What is the definition of purging? (API 1604, Section 4.3.1)

Bringing fresh air into tank, Venturi compressor

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What is the definition of inerting? (API 1604, Section 4.3.1)

Pushes out flammable vapor, Use Dry Ice

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During purging and inerting flammable vapors are displaced from the tank. At what height
above grade should flammable vapors be vented? At what height above adjacent roof lines?
(API 1604, Section 4.3.2)

12 feet

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Under what circumstance should inerting NOT be used? (API 1604, Section 4.3.3)

when entering the tank

Why should inert gases should be introduced into tanks at low pressure? (API 1604,
Section 4.3.3)

moving vapors too fast will cause explosion

What is the maximum pressure allowed in the tank when using carbon dioxide or nitrogen
to inert the tank? (API 1604, Section 4.3.3

5 psi

Why must the device that discharges an inert gas into an underground tank be grounded?
(API 1604, Section 4.3.3)

Explosion

Why should carbon dioxide fire extinguishers not be used to inert underground tanks? (API 1604, Section 4.3.3)

Vapors Rise

What is the minimum amount of solid carbon dioxide (dry ice) that should be used to inert a tank? (API 1604, Section 4.3.4)

15 to 20lbs per 1000 gal

When inerting a tank with dry ice, what should be done to promote rapid evaporation of the dry ice? (API 1604, Section 4.3.4)

Crushing and spreading evenly

What are three general techniques for freeing a tank of flammable vapors? (API 1604, Section 4.3.5, 4.3.6 and 4.3.7

Inerting, purging, filling with water

Which method of tank purging requires that a drop tube be in place during the procedure? What does the drop tube ensure? (API 1604, Section 4.3.5)

Venturi purging

When purging a tank using a diffused air blower, what must be done to prevent the discharge of a spark? (API 1604, Section 4.3.5)

Ground

What is the maximum allowable pressure in an underground tank when using a diffused air blower? (API 1604, Section 4.3.5)

5 PSI

Until what point in the tank removal process should combustible vapor concentrations be measured in the tank and the excavation area? (API 1604, Section 4.4.1)

at beginning

At what level in a tank should combustible vapor concentrations be measured? (API 1604, Section 4.4.2)

Bottom, Middle , Top

What lower explosive limit (LEL) readings must be obtained before a tank is considered safe for removal from the ground? (API 1604, Section 4.4.2)

10 or Lower

Under what circumstances should closure in place be considered? (API 1604, Section 4.5.1)

Tank Location ( Adjacent structures may be damamaged or weakened Removal may be physically impossible Local Regulations and available equipment

What type of material should be used to fill a tank that is being closed in place? (API 1604, Section 4.5.4)

Inert Material

After a tank that is being closed in place is filled with inert material, what is the next step? (API 1604, Section 4.5.5)

Fill and cap opening

When closing a tank in place, what is the last tank connection to be disconnected? (API 1604, Section 4.5.6)

Vent

What should be done after a tank has been freed of vapors and before it is removed from the excavation? (API 1604, Section 4.6.1)

Plug all opening 1/8 invent

After a tank has been freed of vapors, it should be sealed except for a 1/8 inch vent hole. Where should this vent hole be located during subsequent storage and transport? (API 1604, Section 4.6.1)

Top facing up

What should be used to prevent movement of a tank after it has been removed from the ground and prior to moving it off site? (API 1604, Section 4.6.2)

Chock it and strap it

What should be used to plug any corrosion holes in a tank that has been removed from the ground? (API 1604, Section 4.6.2)

Screws, Boilers plug

At what point during the removal process should a tank label listing precautions regarding used petroleum storage tanks be affixed to the tank? What is the minimum recommended size of letters on this label? (API 1604, Section 4.6.4)

Before transport 9 inches

What four items of information should be included in the tank label? (API 1604, Section 4.6.4)

Contents, Vapor state, vapor freeing treatment and date, Do not Reuse

“Lead vapors may be released if heat is applied to the tank shell.” These words should be part of the label applied to what tanks? (API 1604, Section 4.6.5)

Leaded Gasoline

For safety sake, what measurement should be made before a tank is removed from a site? (API 1604, Section 4.6.6.1)

LEL

What size vent hole is required for tanks that are in storage? What should be done to all other tank openings? (API 1604, Section 5.2.1)

1/8, plug

Where should used tanks be stored? (API 1604, Section 5.2.2)

Safely on property in secured area

Before being sold for scrap or otherwise disposed of, what should be done to an underground tank? (API 1604, Section 7.1.1)

Vapor Free and cleaned of all liquids

Prior to re-use, tanks must be recertified by

Manufacturer