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2027 International Fuel Gas Code

Chapter 7Gaseous Hydrogen Systems

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Question 1 1.

An engineer is designing a hydrogen fuel storage layout inside a building governed by the International Residential Code. What is the maximum permitted volume for flammable gas cylinders stored indoors at normal temperature and pressure (NTP)?

Question 2 2.

Under what condition does the code permit a shutoff valve to be installed between a gaseous hydrogen pressure relief device and the container it protects?

Question 3 3.

Pressure relief devices on gaseous hydrogen systems must be arranged to discharge unobstructed to the outdoors, except this requirement does not apply to DOTn-specified containers having an internal volume of not more than what capacity?

Question 4 4.

Which of the following piping materials is expressly prohibited from being utilized for pipe, valves, and fittings conveying gaseous hydrogen?

Question 5 5.

Hydrogen piping systems must be marked with the name of the contents and a direction-of-flow arrow. What is the maximum allowable spacing interval between these markings along the piping?

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