between the 2003 and the 2014 editions of. ANSI/APSP/ICC-1 “American National Standard for. Public Swimming Pools”. Presented to the IAPMO Standards Reviewall NSPI standards, which include: ANSI/NSPI-1 2003 Standard For Public Swimming Pools. ANSI/NSPI-2 1999 Standard For Public Spas. ANSI/NSPI-3 1999 Standard ANSI/NSPI-1 2003. Approved March 10, 2003 American National Standards Institute. 291580.nspi 7/31/03 3:04 AM Page 1. This is a preview of "ANSI/NSPI 1-2003" ANSI/NSPI-1 (2003) Standard for Public Swimming Pools. MINIMUM DIVING WATER ENVELOPE. NOTE: L4 is a minimum dimension to allow sufficient length opposite ANSI. NSPI-1 2003. American National Standard for Public Swimming Pools. Sponsor. National Spa and Pool Institute. Approved March 10, 2003. Refer to ANSI/NSPI-1 2003 AMERICAN NATIONAL STANDARD FOR PUBLIC SWIMMING. POOLS, Figure 1- Construction dimensions for water envelopes for Class B and Class