Emerson Process Management 5300 manual Installation in Concrete Silos, Metal

Rosemount 5300 Series

Reference Manual

00809-0100-4530, Rev BA July 2009

Installation in Concrete

Silos

Metal

Considerations for Solid Applications

The flexible single lead probe is recommended for solids and is available in two versions to handle different loads and lengths:

•0.16 in. (4 mm) diameter

Tensile strength is minimum 2698 lb (12 kN) Collapse load is maximum 3597 lb (16 kN)

•0.24 in. (6 mm) diameter

Tensile strength is minimum 6519 lb (29 kN) Collapse load is maximum 7868 lb (35 kN)

Keep the following in mind when planning installation of the Rosemount 5300 in solid applications:

•There might be considerable down-pull forces on silo roofs caused by the media, so the silo roof must withstand the maximum probe tensile load

•The tensile load depends on silo size, material density, and the friction coefficient. Forces increase with the buried length, the silo, and probe diameter

•In critical cases, such as for products with a risk for build-up, use a 0.24 in. (6 mm) probe

•Depending on position, forces on probes are two to ten times greater on probes with tie-down, than on probes with ballast weights(1)

Guidelines for the tensile load from free-flowing solids acting on a suspended probe without any tie-down or weight in a smooth metallic wall silo as shown in Table 3-2. A safety factor of 2 is included for the figures. Consult your local Emerson Process Management representative for more information.

(1)The weight should not be fixed for probe 100 ft (30 m) or longer.

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