Morrison Bros. Co. has introduced a new oil/water sensor to their 925 line, a float-activated simple switch device able to gauge the accumulation of oil in oil/water separators. Set point configurations for the sensor include your choice of 1-2 interface floats (sink in oil and fuel but float on water) and 0-2 standard floats (float on oil, fuel, and water). The sensor is compatible with the 918AC System Interface to allow for audio and visual alarm functionality.
With EMV fast approaching, it’s time to take advantage of OPW’s complete line of Decommissioning & Conventional Hanging Hardware Kits. All kits are 100% factory tested and certified and will reduce the time spent on installation at gasoline and diesel hose points. Available kits include standard gasoline and diesel kits, as well as vac-assist and balance decommissioning kits.
Be sure to check out the official brochure for additional product specs for the available kits.
In the images seen here, professional contractors carefully followed all of the guidelines to ensure a high quality UPP™ pipework system installation. However, when the time came to add backfill beneath the tank chambers the contractor was less careful. The backfilling knocked the pipe out of position, dislodged spacers and contaminated open entry seals and other fittings with backfill material.To ensure a top-quality installation, UPP® pipework systems should be installed according to the guidelines below and the installation documents referenced at the end of this article:
Important: Do not use mechanical compactors such as vibrating plates or road rollers around tank chambers and dispenser sumps. Use a manual compactor to compact the backfill around the base of the sump. Do not compact the backfill above the tank chamber base. To prevent the riser from deforming, make sure the tank lid is closed and secured before you back fill the area from the top of the tank chamber base to the top of the riser.
Acceptable backfill materials for UPP® pipe systems are:
Well-rounded pea gravel from 3 mm (0.12 inches) to 20 mm (0.79 inches).
Crushed rock from 3 mm (0.12 inches) to 16 mm (0.63 inches).
Clean washed sand.
Acceptable backfill materials for tank chambers are the following Class I and II materials, per ASTM d-2321:
Class IA materials include angular, open-graded, clean, manufactured aggregate that contain little or no fines such as crushed stone or crushed cinders or shells.
Class IB materials include angular, dense-graded, clean, processed aggregate such as Class IA materials mixed with sand and gravel to minimize migration.
Class II materials include clean, coarse-grained soils that contain little or no fines such as gravel, gravel-sand mixtures, and well and poorly graded sands.
Shovel slicing (cutting the backfill with a shovel) is the recommended way to compact Class I and II materials. To improve compaction, slightly wet the backfill, but do not saturate the material or flood the trench.
Before an installation, add a 15 cm (6 inch) bed of backfill under the pipes. Make sure the backfill is not contaminated and that there are no voids under or around the pipe.
If the tank chamber overhangs the tank containment collar, add enough backfill around the underside of the chamber so that it is fully supported.
If the UPP® pipe exceeds 12 m (39 ft), lay it in a series of large curves not straight lines. (Uncoiled pipe will settle into a natural curve.)
Make sure pipes are separated from each other by at least the diameter of the largest pipe.
If pipes cross each other, make sure they are separated by at least as much backfill material as the diameter of the largest pipe or are protected by at least 25 mm (1 inch) of expanded polystyrene.
Without following the correct procedures the backfill material would then need to be removed from sumps, chambers and open fittings and the pipework levels would need to be reset, with all spacers replaced. This would take a considerable amount of time and delay the installation, with all the associated financial costs that implies. It is important that all parties involved understand the care and attention to detail that go into a smooth and problem-free installation. A simple but careless mistake can have big implications.