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Submersible Pumping Systems

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High Capacity Line Leak Detector

The High Capacity MLD product line is based on our standard STP-MLD unit design, proven reliability since 1992. The High Capacity MLD’s compact design allows installation in the same containment sump as the submersible, greatly reducing the amount of unprotected leak points between the submersible and the MLD.

Design Highlights/Advantages

  • Low Line Restriction - Piston design offers the maximum flow rate possible by keeping flow restriction through the leak detector at an absolute minimum. Piston has a full 1 7/8” (47.6 mm) of travel to move the leak detector poppet fully out of the flow path when product is being pumped.
    Benefit: Low line restriction means your high capacity sites will
  • benefit from the maximum flow rates your pumps will allow during peak business hours. Higher flow rates means more volume in less time when you are the busiest.
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  • Faster Installation - MLD-HC can be installed after purging air on new installations.
    Benefit: Reduced Installation Time
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  • Piston Design - Piston cylinder has 5.75 cubic inches (94.22 cc) of volume to help minimize nuisance tripping due to thermal contraction during cold weather.
    Benefit: Improves Performance and Reduces Maintenance.
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  • MLD-HC Seal - Threads seal using o-rings
    Benefit: Thread sealant not used to install MLD-HC. This seal design makes for simple installation and removal of MLD-HC without large wrenches in the tight working environment of the containment sump.

Specifications

  • Detects leaks of 3 GPH (11.4 LPH) or greater at 10 PSI (69 kpa).
  • Third party evaluated to comply with U.S. EPA requirements 280.41 (B) and 280.44 (A) for continuous monitoring of pressurized piping systems with:
  • Maximum of 396.6 gallons for rigid pipelines.
  • Maximum of 95.5 gallons for fl exible pipelines.
  • Maximum of 492.1 gallons for combination of rigid and fl exible pipelines.
  • Size: 7 3/4” wide by 15” high (197 x 381 mm).
  • Weight: 28 pounds (12.7 kg).
  • The MLD-HC will remain in the open flow position with dynamic line pressure at 2 PSI (13.8 kpa) at the outlet.
  • Maximum static head pressure without affecting operation is 12’ (3.7 m) from MLD-HC to dispensing point.
  • Minimum height required from 3” (76.2mm) NPT port centerline for top clearance is 9 1/2” (241 mm). Not position sensitive. Can be installed horizontal to reduce clearance to 3” (76.2 mm).
  • Compatible with all blends of motor fuels including alcohol blends from 0 to 100% ethanol or methanol, 20% MTBE or ETBE with 80% gasoline, or 17% TAME with 83% gasoline as well as diesel, fuel oil, avgas, jet fuel, or kerosene.
  • 2 Models available: STP-MLD-HC for gasoline, STP-MLD-HCD for diesel Approvals
  • UL and cUL Listed Quality Certification
  • Franklin Fueling Systems is an ISO 9001 certified Manufacturerfacturer


Ordering Information


Model Description
401315902 STP-MLD-HC Capacity Leak Detector - for Gasoline COMPLETE with adaptor
401320902 STP-MLD-HCD Capacity Leak Detector - for Diesel COMPLETE with adaptor
401315901 Replacement High Capacity Leak Detector ONLY - for Gasoline
401320901 Replacement High Capacity Leak Detector ONLY - for Diesel
401316930 Replacement Cover Assembly
401325901 Replacement 3 “T” Housing and Cover Assembly
400449902 MLD HCP Hardware Pack (includes fittings and documentation)
    *** Refer to High Capacity MLD Installation Manual for complete fuel compatibility specifications.