Report on Comments – June 2011
Rick Thornberry, The Code Consortium, Inc. 30-160 Revise text as follows: 18.104.22.168 Testing required by 21.5.2 shall not be required for a primary tank or an interstitial space that continues to maintain a factory-applied vacuum in accordance with the manufacturer’s instructions. Such components shall be considered to be tight until such time that the vacuum is broken. Final tightness testing of an interstitial space shall not be required if the factory-applied vacuum is maintained until:
for aboveground tanks, the tank is set on the site at the location where it is intended to be used, or
for underground tanks, backfill has been completed to the top of the tank.
The revision proposed in this Public Comment is simply a clarification of the last sentence of this section in order to eliminate a potential conflict within the section. Obviously, backfill only applies to underground tanks so aboveground tanks need to be addressed as well for eliminating the need to have a final tightness test of the interstitial space where a factory-applied vacuum is maintained. So for aboveground tanks that condition is satisfied as soon as the tank is set on the site at the location where it is intended to be used. Without this revision, it can be interpreted that the last sentence would not allow the omission of final tightness testing for aboveground tanks where the interstitial space maintains a factory-applied vacuum, although that appears to be allowed by the first sentence of this section.
Printed on 9/16/2010