2025 UL Ordering Catalog - Flipbook - Page 32
MLD+ MECHANICAL LEAK DETECTORS
ORDERING INFORMATION
SPECIFICATIONS
Standard Fuel MLD+ Mechanical Leak Detectors
All models are capable of detecting line leaks
equivalent to 3 gph at 10 psi (11.4 lph @ 0.70 bar)
when installed properly with the appropriate fuels Line leak detection
all models will signal detection of leaks by restricting
product delivery to less than 3 gpm (11.4 lpm) and
taking more than 4 seconds to open
Model
Description
403168901
STP-MLD+G for gas, single pack (blue cover,
copper vent tube, brass fittings)
403168903
STP-MLD+G for gas, three pack
403170901
STP-MLD+D for diesel, single pack (black cover,
copper vent tube, brass fittings)
403170903
STP-MLD+D for diesel, three pack
403172903
STP-MLD+ Combo, three pack (contains two
STP-MLD+G and one STP-MLD+D)
Biofuel MLD+ Mechanical Leak Detectors
Model
Description
403169901
STP-MLD+AG for alcohol-gas, single pack (blue
cover, stainless steel tube and fittings)
403169903
STP-MLD+AG for alcohol-gas, three pack
403171901
STP-MLD+BD for Biodiesel, single pack (gold cover,
stainless steel tube and fittings)
403171903
STP-MLD+BD for Biodiesel, three pack
Notes:
1. MLD+G are listed for compatibility with fuel mixtures containing up to 10% ethanol
with gasoline, up to 5% Biodiesel with diesel fuels, and 20% MTBE, 20% ETBE, or 17%
TAME with gasoline.
Delivery default
All models will remain in the open position during
product delivery to manifold, with discharge
pressures as low as 1 psi (0.07 bar) - all models will
reset to “tripped” when line pressure delay is below
3 psi (0.21 bar) with pump off
Detection distance
Detects leaks up to 10 feet (3 meters)
above the point of installation
Max. liquid
viscosity
70 SSU at 60° F (15° C)
Gasoline models
Gasoline models (blue cover, MLD+G and MLD+AG)
are also listed for fuel mixtures containing 20%
MTBE, 20% ETBE or 17% TAME with gasoline as
well as diesel fuels, fuel oils, kerosene, Avgas, and
jet fuels
Diesel models
Diesel models (gold cover, MLD+D and MLD+BD)
are also listed for kerosene applications
Approvals /
Certifications
2. MLD+D models are listed for compatibility with diesel fuels with up to 5% Biodiesel
and kerosene applications only.
3. MLD+AG models are listed for fuel mixtures containing up to 85% ethanol with
gasoline and 20% MTBE, 20% ETBE, or 17% TAME with gasoline as well as diesel
fuels, fuel oils, kerosene, Avgas, and jet fuels.
4. MLD+BD models are listed for diesel with up to 20% Biodiesel or 100% Biodiesel
and kerosene applications only.
5. All above models will only mount in the 2" NPT leak detector port of a 4"
submersible turbine, including competitive models, or in a leak detector adapter tee
(sold separately below).
6. MLD+ models are listed for use with rigid pipelines up to 165.1 gallon capacity,
with flexible pipelines up to 109.8 gallon capacity, and with combination rigid/flexible
pipelines up to 274.9 gallon capacity.
−
−
−
cULus listed
Third party certified to comply with US EPA
requirements 280.41 (B) and 280.44 (A) for
continuous monitoring of pressurized piping
Consult factory for other applicable approvals
Installation
• MLD+
• MLD+ vent tube
3• Line Leak Detector Housing (2" NPT)
4• Tank port (vent tube must be connected here)
5• Syphon port
1
2
MLD+ Mechanical Leak Detector Repair Parts and Accessories
Model
Description
400440101
Vent tube (for use with MLD+G and MLD+D)
400449903
Hardware pack (fittings and documentation for
MLD+G and MLD+D)
403123001
Vent tube, stainless steel (for use with MLD+AG and
MLD+BD)
400449904
Hardware pack (fittings and documentation for
MLD+AG and MLD+BD)
400518001
Leak detector adapter tee
32
1
5
10.65"
(270.51 mm)
10.32"
(262.13 mm)
3
2
4
MLD+ Mechanical Leak Detectors
