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NC HazMat 12/2017 > Pipelines > Flashcards

Flashcards in Pipelines Deck (11)
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External Floating Roof Tank

Characterized by ladder present on side and sometimes seen across the top of full tanks.


Internal Floating Roof Tank

Characterized by cone or dome roof usually with overflow vents around top of sidewall.


Pipeline right of way markers

  1. Product being pumped through pipeline
  2. Owner/Operator
  3. Emergency Phone Number


Spherical storage tank

High pressure gases.

Pressure relief valve at top.

Lack of pressure relief valve may indicate cryogenic liquid


Vertical Cryogenic

Tank in tank.

Liquefied gases.

Set on legs on concrete pad.

Usually a radiator is present nearby the tank to help maintain auto refrigeration.


Ordinary (Cone) roof.

May also be geodesic dome. 

Weak seam construction- Roofs are weakly welded to sidewalls as safety precaution in event of fire/explosion.


Lines colored Red vs. Lines colored Yellow

Red = Liquid Line

Yellow = Vapor

Color codes may be industry or site specific NOT federal or state laws


7 safety features and devices found at fixed bulk storage facilities

  1. Tank spacing
  2. Drainage control system
  3. Venting systems
  4. Atmospheric monitoring and leak detection
  5. Fire protection systems
  6. Transfer and flaring operations
  7. Remote emergency shut off valves and switches


Three ways products in pipelines can be separated.

  1. Shipped as mixed (commingled) and re-separated at the point of use. MOST COMMON
  2. Separated by a plug (pig) or sphere (ball)
  3. May be separated by a quantity of water


T/F- Vents for underground tanks must extend above the roofline of any structure located on site.



T/F- Underground pipes for underground tanks may be double walled.