Expansion tanks when used in a ship's low...

Question 1 of 2921866636eee28f7522a1c51e8cd

Expansion tanks when used in a ship's low temperature hot water heating system may be of the open or closed type. Referring to the illustrated central-station hookup for a hot water heating system drawing, what would be the normal temperature range of the water? Illustration GS-0151

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Question 1 of 29218

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🔍 Key Concepts

• Difference between low temperature hot water (LTHW) and high temperature hot water (HTHW) systems • Effect of an open expansion tank operating at (or near) atmospheric pressure on the maximum safe water temperature • Typical heating coil / convector operating temperatures for accommodation-space heating on ships

💭 Think About

• Look at the words in the question: if the system is specifically called a low temperature hot water system, which of the choices still makes sense as a “low” temperature for water? • If the expansion tank is of the open type and therefore near atmospheric pressure, what happens to water as you approach and then exceed its normal boiling point? Which answer choices would cause problems in that open tank? • Consider crew safety and equipment materials in fan-coil units and convectors shown in the illustration. Which temperature range is commonly used to heat spaces without scorching dust or creating excessive surface temperatures?

✅ Before You Answer

• Eliminate any ranges that are well above the normal boiling point of water at atmospheric pressure (212°F) for an open-tank system. • Ask whether the remaining temperature range(s) are consistent with the term “low temperature hot water heating” as used in marine heating practice. • Confirm that the selected range would provide comfortable space heating using the convectors and duct heaters shown in the GS-0151 diagram, not process steam-like temperatures.