REV03026720010220
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Use proper quality approved fuel line materials with similar inner diameter (ID) to the inlet/outlet of the system. For
extended suction side plumbing runs, it is recommended to install oversized pipe, (1/4” to 1/2” increased ID) (Ref.: Page 4
– Suction Capability).
Note: Flexible plumbing is strongly recommended for system inlet and outlet connections to external plumbing in order to
avoid issues with thermal expansion, prevent putting any stress on the internal fittings of the system, and enable ease of
maintenance/installation.
The pick-up tube/line(s) should originate from the lowest point of the tank to ensure all water is removed. Also, it should
be connected directly to the system’s inlet port (located on the left-hand side of the system) and be kept as short as
possible. It is recommended that an oversized, low restriction foot valve be installed to keep the system primed, especially
if the inlet port of the system is located above the lowest possible level of fuel in the tank. Additionally, a priming tee
should be installed at the highest point of the suction line to enable priming of the pipelines and system.
The return line(s) should be plumbed to the system’s outlet port (located on the right-hand side of the system) and enter
the tank as far as possible away from the pick-up tube, close to the tank bottom.
Multiple suction and/or return lines may be connected to a manifold outside the system.
Note: Anti-Siphon or other external plumbing devices may be required by state and/or local regulations & code.
Cumulatively, the system capabilities are 15 FT. (4.57 m) suction (vertical lift) or 100 FT. (30.48 m) horizontal run, when
connected to the minimum recommended piping size (Ref.: Page 4 – Inlet/Outlet Port), or more, with no additional flow
restrictions. That includes valves, 90-degree connectors, or other plumbing accessories. For continuous optimal
performance, make sure suction and discharge lines are free of contamination, nothing is blocking the flow of fuel, and the
suction line always stays primed.
Note: Plumbing installation must be in accordance with all applicable federal, state, and local rules, laws, standards, and
regulations.
Note: Additionally, if the system must share a fuel oil supply (FOS) line with a generator, we recommend check valves be
installed after the split in the line, before the landing/entrance into the generator tank and the fuel polishing system. Also, it
is highly recommended that the “External Shut Down” contacts on the PLC are utilized as well in this scenario.
Typical Plumbing Installation (Schematically)
See provided P&ID drawing(s).
Important Installation Precautions
The suction line of the system should be independent and separate from the suction line of the engine. If that is not
possible, appropriate valves must be installed to completely separate the system from the engine’s fuel system to prevent
any possible interference with safe engine operation (please see note above).
Also, it is highly recommended to plumb the discharge line independent and separate of the engine’s fuel return line back
to the tank. If the return line from the engine and the discharge of the system must be combined in any way, adequate
valves should be installed to prevent any possible interference with safe engine operation.
Multi-Tank Installation –
If Applicable
Please connect each tank’s dedicated supply and return lines according to the provided drawings. Use approved flexible
lines to avoid issues with thermal expansion, prevent putting stress on plumbing connections, and enable ease of
maintenance/installation. Additionally, please be sure to plumb each supply and return ball valve in parallel (on separate
lines) leading to their respective tank(s). See provide P&ID drawing for more information.
Summary of Contents for STS 6020
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