Do I have to “Water Test” a DoubleWall Sump?

A: Yes and no.

NO: If the DoubleWall sump is continuously monitored via vacuum or hydrostatic fluid per California AB-2481 VPH guidelines, you will void the sump warranty if water tested per SB-989 guidelines.

YES: If the DoubleWall sump is installed and intended to be used only as a “SingleWall” sump, in addition to standard VPH testing procedures during initial installation, SB-989 periodic testing is permitted. In this case the decision is made by environmentally responsible fuel marketers to have sumps installed prior to the need for monitoring, which are capable of being continuously monitored per California AB-2481 guidelines.

Let’s educate ourselves. Download LG Letter 162-1 and browse to Page 6, to the latter of Part II: Section A.

The paragraph reads: Pursuant to Section 2637(a)(6) of Title 23, CCR, portions of the UST system which are continuously monitored using vacuum, pressure, or interstitial liquid level measurement methods are exempt from periodic secondary containment testing. Therefore, periodic secondary containment testing is not required for secondary containment of tank and piping that are continuously monitored using vacuum, pressure, or interstitial liquid level measurement methods. Please note that annual certification of the leak detection equipment is still required.

Assembly Bill 2481 is specific to the State of California. These high standards far exceed the level of containment provided by the SB-989 standards.

As far as testing is concerned, testing per SB-989 is only valid for SingleWall sumps. It is not a practical test method for DoubleWall sumps which are already continuously monitored.

1) Sump ships from factory sealed under a continuous Vacuum test of 20″+ Hg.

2) Any breach in the wall, after sealed (Eg. penetration fittings, lamination) is pressure/soap tested at 4 psi.

3) A 4 psi air integrity test is conducted after all laminations / fittings have been installed (prior to any hydrostatic filling) for one hour to allow the pressurized interstice to acclimate, then level is recorded, and tested for another hour before recording result.

4) We also recommend that when DoubleWall sumps are left overnight, that they have a factory-level vacuum (20″+ Hg) applied to the interstice, so that they can be inspected the next day.

5) If the sump is to be hydrostatically monitored, it is Hydro-Vac Filled. This is a Bravo-Exclusive installation procedure that pulls a 20″+ Hg vacuum on the interstice, then allows the interstitial fluid to flow in from a multi-gallon source through a ball valve. That isn’t a test! You’re right. The Advanced Leak Detection Procedure (ALDP) depends on the sump being filled with our interstitial fluid first. The ALDP test pulls a high vacuum on the interstice after it has been filled with liquid. With no acclimation necessary, the inspection can be done right after the Hydro-Vac filling process. Any leaks in the DoubleWall sump will show up as trails of bubbles coming directly from the leak point(s), which can then be located and repaired without wasting time guessing.
 
Bravo Systems has been producing DoubleWall Containment sumps since August 2003 and has continued to be the Leader in reliable Secondary Containment equipment. Realizing that the last point of failure were the varied models of flexible penetration fittings, Bravo Systems engineered an entire line of Tank-Spec Fiberglass Fittings (F-Series) that allow you to install and forget while being compliant at the highest level. The F-Series provides unquestionable peace of mind as the fittings cannot deteriorate or fail since they contain no plastics, rubber, nuts/bolts, metals and do not need to be filled with caulks or mechanical sealants. We are also the only manufacturer that provides an all-fiberglass conduit penetration fitting. Take a look at our line of all-fiberglass fittings from the Products navigator at the top of the page.