How do you purge air out of a doublewall sump?
The procedure to test and purge the sump is the same for tank sumps, UDC’s, or vent boxes.
The sump is opened and inspected. Check for signs of:
1) an interior monitoring fluid leak;
2) if the manometer is currently full and attached to the correct port;
3) atmospheric port is open; and
4) sensor is in place and functioning.
To prepare the sump for purging and vacuum, drain fluid from the interstice lowering the fluid level 10” to 20” depending on sump depth.
This will give an air gap above the monitoring fluid to apply vacuum to.
Disconnect the tube from the bottom of the sensor manometer and attach it to a ball valve. Connect the other end of this ball valve to a 5-gallon bucket of monitoring Fluid.
With all other ports closed, attach a vacuum source to the highest port on the sump. Pull the highest vacuum possible up to and including a full vacuum. A minimum of 20Hg is required, or the vacuum source is insufficient.
Observe the sump walls for visible bubbles as the vacuum level rises. The fluid level will rise in the sump walls as the vac increases but will stop at a point. If the fluid level was lowered sufficiently the fluid will not reach the high port.
Leave the vacuum source running until the bubbles stop. This will indicate the trapped air has been purged.
Bravo sumps are rated for a full vacuum so leaving the vac pump or venturi running for extended periods will not damage the sump.
After bubbles visible in the sump interstice stop, close the ball valve on the gauge assembly. The sump has now been purged of air and is under test to confirm the sump doesn’t have a leak. The vacuum should be a minimum of 20” Hg. If there are concerns that a high water table could inhibit testing, check the monitoring well.
If the gauge holds for 30 minutes the test is complete. If the gauge drops check all threaded connections and repeat the process.
Once test is complete it’s time to reintroduce monitoring fluid into the interstice. Actively apply vacuum to the sump interstice (turn on vac source and open ball valve on gauge assembly). Pull the highest vacuum possible, not to be less than 20” Hg.
Slowly open the ball valve on your monitoring fluid bucket about 25%. Allow the vacuum to slowly draw the fluid into the sump interstice. Make sure you maintain a minimum of 20” Hg during this process. If vacuum begins to drop close the ball valve some and fill slower.
As soon as monitoring fluid begins to enter the tube used to attach the vacuum source, immediately close both ball valves. Disconnect the vacuum source and leave sump at atmospheric pressure.
Install an open vent tube into the high port. This will be left open when the sump is in service.
Re-install the manometer tube. Add fluid to the manometer until it is present in the vent tube. This may take several minutes but will purge the last bit of air from the interstice. Replace the sensor and cap.
Completed sump in service.
How do I get certified to install Bravo products?
Contact your territory sales rep and schedule a training session.
What fuels are Bravo sumps compatable with?
Bravo products including tank sumps, transition/vent sumps, under dispenser containment, as well as fittings are tested and listed under UL2447, which tests for gasoline, ethanol blends, diesel and biodiesel up to B100. List of fuel compatability and references below.
UST Component Compatibility Library – Hosted by PEI
Alternative Fuel Statement of Compatibility Library – Hosted by CA SWRCB
We certify that our products are compatible with and approved for use in secondary containment of DEF.
We certify that our singlewall and doublewall fiberglass secondary containment systems have tank-like long term compatibility with fuel blends up to E100 and B100. We provide two separate letters below.
Bravo fiberglass products are UL Listed to be compatible with all alcohol blends. UL Certifications / proof of listing can be found on each applicable product’s webpage in the documents area.
What types of modifications does Bravo allow for Conversion frames?
- In order to accommodate conduits on the outside of the sump or near the water splash of the existing sump, the angled plates may be cut around the interfering condut.
- Holes can be made in the top surface of the conversion frame to allow conduit to pass through.
- All modifications done in California to the conversion frame opening must be sealed with retrofit plates (conv-retrofit) per instructions.
- Do I need to fill out a site survey to order conversion frames?
What sealant does Bravo recommend to seal frames to fiberglass and plastic?
Bravo recommends to use Bostik 1100FS
Does the Bravo Conversion Frame collect fuel from the vapor panels of dispensers?
No. The Bravo Conversion Frame (DCF) was developed to contain and control falling fuel spilled from a filter replacement, or small incremental leaks within the hydraulic cabinet area of a dispenser only. This area that we targeted when we started this Secondary Containment industry does not include the often spacious “vapor panels” that are common today.
It is true that in some cases the fuel line for the exterior hose has a threaded connection at the valance-level and runs partially or mostly within the vapor panel area but it is typically a solid, continuous line running to the connection point within the hydraulic cabinet area of the dispenser. This area or the connection(s) that happen there have never before been scrutinized or required to be secondarily contained. What is more, state waterboard staff have relayed their opinion that the Bravo DCF accomplishes its function of funneling any fuel leaks from the hydraulic cabinet into the UDC and meets the intent of the law.
- The likelihood of the fuel lines leaking from anywhere except a threaded connection is low and there should not be any such points between a primary connection within the hydraulic cabinet and the point that it transitions to the hose on the exterior.
- Any leaks that might occur from the threads of these lines are going to follow gravity down the path of least resistance – all while evaporating – and if any liquid actually does run down the line into the hydraulic cabinet area it is collected by our Dispenser Conversion Frame (DCF – CONV-B2000). Leaks are not likely to fall from the pipe line within the vapor panel area.
- By providing a capture mechanism in the vapor panel that directs potentially falling fuel into the UDC we would be bypassing the established and proven function of the water-splash lip by creating a point where water can be captured as well, increasing the risk of water accumulation and false alarms. We seek to first maintain our decades-old reputation of maintaining regulatory compliance in the pursuit of environmental and human safety. But this includes helping our customers avoid unnecessary and potentially costly false alarms.
- There should be no requirement for Retroactive modifications. Simply put, Bravo does not condone or seek to bring about additional mandatory costs to our customers unless the environment or human health is at risk. In this case we do not consider the vapor panel area of dispensers to pose any threat to either.
FOR CALIFORNIA: State law prohibits anything that increases false alarms due to water intrusion and such alarms can result in full station shut-down which is directly associated with a loss of revenue.
BET YOU DIDN’T KNOW: The Bravo Dispenser Conversion Frame was first launched in 1991, some 16 years before the State of CA made a UDSCCS (Under Dispenser Secondary Containment or Control System) mandatory for dissimilar dispenser upgrades/change outs. We hope you didn’t think that our product was simply built to comply with the 2007 mandate.
What are the integrity testing protocols for Bravo sumps?
A:The procedures approved by S. Bravo Systems, Inc. for the SB-989 (SingleWall) and AB-2481 (DoubleWall) sump tests are detailed within each products instruction manual. For additional up-to-date info, please click HERE to download the SB-989 PDF.
Note: Always check with your local regulatory authority for additional guidelines for testing requirements that may be more stringent than those established by S. Bravo Systems, Inc.
List of Bravo Kits and Accessories that can’t be sent via air freight:
- Lamination kits
- Paste kit
- Slurry kits
- EP-S1.0 Gal
- EP-S.75 Gal
- EPC-S 1 Gal
interstitial monitoring liquid
IMF 1 Gal
How far can you cut a tank sump down?
- Single wall tank sumps bodies can be cut down to 2” from the top.
- Tank sump bases should not be adjusted and are designed for a specific minimum burial depth.
What should I do if my sump is still too tall?
- If the sump is cut down as far as possible and still too tall, contact factory
What should I do if my sump is too short?
- If the tank was buried too deep, or there is a water intrusion problem in the field, Bravo can build an extension piece to lengthen the sump or reducer as required.
- If a dispenser sump is too shallow and needs to be raised, Bravo can fabricate sump top extensions to raise the shear point the appropriate height.
Can I buy a new Shallow Pan?
No. Bravo has discontinued the B2000 product line.
Can I repair a B2000 sump?
Penetration fittings may be repaired using B2000 Retrofit kit.
The sump is all rusted out. What can I do?
How much liquid must be in the manometer?
- The larger diameter reservoir should be filled 2/3 to ¾ full.
Should I need to top off the manometer?
No. Adding fluid frequently should not be necessary. However, monitored doublewall systems are subject to various and varying physical and environmental conditions as outlined below. When these conditions are present, periodic observation and maintenance may be required. Procedures may include topping off the interstitial fluid. The majority of these false-alarms happen during seasonal temperature shifts.
It is recommended that a maintenance program be established to support the integrity, cleanliness and function of a containment system at any fuel site in an effort to proactively protect the environment from contamination. Each and every alarm caused by a fluid level drop should be evaluated and monitored. Sumps where an alarm occurs more frequently than every 6 months between seasonal shifts should be considered suspect due to a leak. Testing procedures for Bravo doublewall sumps as outlined in each respective installation manual should be followed to attempt to pinpoint the cause of a potential loss of interstitial fluid. This testing should be conducted only by a Bravo Systems doublewall-Certified individual or company.
Repairs on sumps with major damage that constitutes a containment breach of any material component below grade are not allowed unless Bravo Systems Technical Support has been contacted, the situation is evaluated and a Letter of Authorization is provided on company letterhead detailing the specific issues and remedy’s.
If there is a drop in the fluid level to the point where an alarm is generated, you may have one or more of a few common issues, show below.
- a) Failed entry fitting
- b) Impact damage to the interior or exterior sump wall. Impact damage or bruising on Bravo Systems sumps may be visually identified by a concentration or spider-web of white color in the fiberglass for that are a natural color. Our sumps have been paint and gel-coat free since mid-2006
- a) A doublewall sump interstice that was filled with propylene glycol by gravity filling and not filled per our mandatory Vacuum-Hydrostatic filling procedure can trap large air bubbles. These bubbles can take several weeks or months to “burp” air from the interstice through the manometers
- b) Air will expand and contract with temperature variations that affects the level of propylene glycol
- c) Hot temperatures will expand the air and can cause fluid to overflow the manometer
- d) Colder temperatures can contract the air and can cause the fluid to drop below the sensor and set off alarm on tank gauge
- a) Localized environmental and/or weather conditions may cause the interstitial fluid to evaporate at a more noticeable rate than other areas. In this case, you should determine whether the liquid loss is recent or if it has been occurring over a long period of time
- a) There also exists an issue with some Tank Sumps where the lack of an atmospheric manometer to equalize sump interstice pressures exacerbates the chance of a false alarm and/or fluid spillage.
- b) To minimize these alarms, you can install our low-profile atmospheric manometer for the doublewall tank sumps that can be easily installed into the test port opposite the manometer to assist in equalizing the sump interstice pressures
B) AIR IN INTERSTICE
C) ENVIRONMENTAL ISSUES
D)LACK OF ATMOSPHERIC MANOMETER
What kind of fluid is compatable for interstitial monitoring?
- Bravo supplies its own propylene glycol based insterstitial monitoring fluid that will not freeze in cold conditions or boil in hot conditions.
- Do not use brine, or attempt to top off IMF filled sump with brine, as it will void the warranty.
What hose length do I need for manometer replacement.
- UDCs require 3ft hose.
- Tank sumps requirement will vary based on bury depth.
What kind of hydrostatic sensor do I need for DoubleWall monitoring?
- Veeder Root…
Do Bravo DoubleWall Sumps include Interstitial Fluid?
- All bravo double wall tank sumps come with the appropriate amount of interstitial fluid for the application.
What do I do if my DoubleWall Sump gauge reads below 12″ Hg (vacuum) or zero?
- All Bravo sumps leave the factory under vacuum as a quality control measure. If the sump vacuum gague reads 12” or lower inHg, pull a vacuum and watch for a dip in the gague.
- If the gauge continues to dip, there may be a leak, or a bad gauge.
New Install Fittings
- How to repair leaking fitting
- How to repair leaking test port
- How much epoxy do I need for XYZ fitting
- How much sanding does the sump wall need before gluing to it?
- Can I use a Flange fitting on a Double Wall sump?
- What kind of adhesive to I need for my flex pipe.
- Can Bravo fittings be used with other manufacturers sumps?
- Can I use XYZ adhesive with Bravo fittings?
- Does bravo have a fitting for poly walls
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