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CDL · Outage and Loading

How does the amount of liquid in a tank affect how it should be loaded, considering legal weight limits and surge?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

The driver must consider the liquid's weight (some liquids are heavy — you may not be able to fill the tank without exceeding weight limits), the liquid's expansion (leave room called 'outage' for expansion), and surge — partially filled tanks have more surge

  1. A Always fill the tank completely
  2. B The driver must consider the liquid's weight (some liquids are heavy — you may not be able to fill the tank without exceeding weight limits), the liquid's expansion (leave room called 'outage' for expansion), and surge — partially filled tanks have more surge
  3. C Only fill tanks halfway always
  4. D Liquid amount doesn't matter

Why this is the answer

Tanker loading considerations: (1) WEIGHT: Liquids vary in density (weight per gallon) — heavy liquids mean you may NOT be able to fill the tank completely without exceeding legal gross/axle weight limits; you might carry a partial load of a dense liquid; (2) OUTAGE (expansion room): Liquids EXPAND when they warm up — you must leave room ('outage') so the expanding liquid doesn't rupture the tank or overflow; different liquids expand by different amounts; (3) SURGE: Partially filled tanks have MORE room for liquid to surge — affects handling; SO: The fill level depends on the liquid's weight, its expansion properties, and legal limits — it's a balance, not simply 'fill it up'; drivers must understand these factors to load legally and safely; some loads will be partial due to weight; outage must always be provided; the interplay of weight limits, expansion, and surge makes tanker loading more complex than dry freight; this is tested on the tanker endorsement.

Source: FMCSA CDL Manual — Tanker Loading, Weight Outage and Surge

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About this topic: Outage and Loading

Outage is the space left in a tank so the liquid can expand as it warms; loading questions ask how much to leave, why it depends on the product, and how weight limits can be reached before the tank is full. This is one of 11 Tanker questions on outage and loading, each with a full explanation on a single study page.

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