NFPA 11C

NFPA 11C is a standard titled Standard for Mobile Foam Apparatus. In other words, it is a standard that applies to mobile foam equipment that firefighters use to contain and extinguish fires caused by flammable and combustible substances in storage tanks and other places at risk of flammable liquid spills. Moreover, this standard does not impose any limitations on emerging technologies or alternative configurations.

Basic Information About The Book NFPA 11C

Book Title: NFPA 11C, Standard for Mobile Foam Apparatus

Publisher Name: National Fire Protection Association

Edition: 1995

FAQs

1. What does the NFPA 11C standard guide aim to achieve?

This standard guides and assists those who are responsible for the design, approval, testing, purchase, inspection, operation, as well as maintenance of mobile foam equipment. All in all, the National Fire Protection Association developed it on the basis of good engineering processes, test results, as well as engineering principles.

2. What does the NFPA 11C standard cover?

This standard guide covers the unique systems and apparatus required to create foam as well as the essential requirements for the vehicle that transport this equipment.

3. What is eductor in NFPA 11C standard?

An eductor is a proportioning (inductor) device that employs a venturi placed in a water line. In other words, it is a device that uses the Venturi principle to proportion foam concentrate into a water stream. It generates a low pressure in piping that leads from a supply of concentrate, so that the concentrate automatically mixes with water in an essential amount.

4. Why does the NFPA 11C standard use concentration?

NFPA 11C defines how to use foam concentrate to create a foam solution. For example, users mix 3 parts of a 3 percent foam concentrate with 97 parts of water to produce the solution. Similarly, they mix 6 parts of a 6 percent concentrate with 94 parts of water. So, the proportion of concentrate needed depends on the type of foam used.

5. What is the use of venturi eductors in this standard?

A venturi eductor is a device that creates a reduced pressure in piping. Installers place the Venturi eductor in the water supply line leading to the foam maker. It starts from a supply of concentrate so that the concentrate automatically mixes with water in the required amount. Moreover, installers also calibrate it in advance. They can also adjust the venturi eductors as needed.