Indiana Administrative Code
Title 675 - FIRE PREVENTION AND BUILDING SAFETY COMMISSION
Article 15 - INDUSTRIALIZED BUILDING SYSTEMS
Rule 2 - Indiana Mobile Structures Code
Section 2-52 - Size of water supply piping

Universal Citation: 675 IN Admin Code 2-52

Current through December 25, 2024

Authority: IC 22-13-2-13

Affected: IC 22-12; IC 22-13; IC 22-14; IC 22-15

Sec. 52.

(a) Minimum Size. The size of water supply piping and branch lines shall not be not less than sizes shown in Table 1B, as follows:

TABLE 1B

Minimun [sic.] Size Tubing and Pipe for Water Distribution Systems
Number of Fixtures Tubing (Nominal) Pipe Iron Pipe Size (Inches)
Dia. (Inches) Outer Dia. (Inches)
1 1/4* 3/8 1/2
2 3/8 1/2 1/2
3 1/2 5/8 1/2
4 1/2 5/8 1/2
5 or more 3/4 7/8 3/4

*6 feet maximum length. Exception: Three-eighths inch (3/8") nominal diameter or one-half inch (1/2") optional diameter size for clothes washing or dishwashing machines, unless larger size is recommended by the fixture manufacturer.

One-half inch (1/2") nominal diameter or five-eighths inch (5/8") optional diameter minimum size for flushometer or metering tube valves unless otherwise specified in their listing.

No galvanized screw piping shall be less than one-half inch (1/2") iron pipe size. (b) Sizing Procedure. Both hot and cold water systems shall be computed by the following method:

(1) Size of Branch. Start at the remote outlet on any branch of the hot or cold water piping and progressively count towards the water service connection, computing the total number of fixtures supplied along each section of piping. Where branches are joined together, the number of fixtures on each branch shall be totalled so that no fixture is counted twice. Following down the left-hand column of Table 1B, in (a) above, a corresponding number of fixtures will be found. The required pipe or tubing size is indicated in the other columns on the same line.

(2) A water heater, food waste disposal unit, evaporative cooler or ice maker shall not be counted as a water-using fixture when computing pipe sizes.

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