SeaLand DHT-L Series Holding Tank - Manual (Page 10)

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Dometic Holding Tanks Components and Functions
• Pre-installed inlet and two outlets for dockside and seacock connections
• Inlet and outlet fittings rotate to facilitate hose connection from virtually any direction (fig. 3 D,
page 3)
• Discharge tubes have special non-clogging design
• Vacuum relief valve protects tank from over-pressure collapse
• Extra fittings allow tank conversion to various inlet and outlet configurations
– one inlet, two outlets (fig. 3 A, page 3)
– one inlet, one outlet on same side of tank (fig . 3 B, page 3)
– one inlet, one outlet on different sides of tank (fig . 3 C, page 3)
• Meets ISO 8099 requirements
4.1 Features
5 Tank Installation
Determine properly located surface that will support the entire area of the tank . If a mounting
surface needs to be fabricated, use marine grade plywood at least 13 mm thick . If installing with
restraining straps, include toe blocks on mounting surface (fig . 4 B, page 4) .
Integrated Mounting Feet Installation (fig. 4 A, page 4)
In the four mounting feet locations around bottom of tank, use at least 6 mm dia . (#12) fasteners
with 19 mm maximum dia . (0 .75 in .) washers to fasten tank to surface .
Restraining Strap Installation (fig . 4 B, page 4)
With restraining straps of 31 mm (1 .25 in .) maximum width, fasten straps over top of tank to
mounting surface on both sides of tank, positioning the straps within the channels on the tank .
5.1 Choose a location for the holding tank
5.2 Prepare a mounting surface
5.3 Install tank on mounting surface
Caution!
The holding tank should not be exposed to temperatures above 45°C (120°F) . Do not place
tank near heat sources such as engine manifolds, water heaters, generators, etc .
Caution!
Do not install tank on projections, such as fastener heads, which could puncture the tank .
Do not allow holding tank to block free flow of bilge water .
A holding tank should be positioned as low in the hull as possible. Most connecting hoses and pipes
should slope downward toward the tank to permit gravity drainage and prevent possible hose odor
permeation . Hose connected to an overboard discharge pump should drain away from the tank .
In addition to dimensions of tank (fig . 1 , page 2), allow 16 cm (about 6 inches) above tank to
easily make plumbing connections .
SERVICE ACCESS – Because Dometic holding tanks may require minimal service in normal
operation, the tank must be installed so that there is easy access to the inspection port .
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