Flowserve 955 Chemiepac - Manual (Page 4)

1.4 Function
The MS is supplied with liquid from the product.
There must always be liquid at the seal gap to generate a seal film. The seal film also
exists when the shaft is stationary.
When the shaft is rotating the seal faces of the seal and mating rings are separated
from each other by the seal film, and so operate in a virtually non-contacting and non-
wearing state.
1.5 Function conditions
The function of the MS is obtained only when the following conditions are fulfilled:
- the seal gap is supplied with clean, solids-free fluid only (solids size < 5µm).
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The product pressure may not exceed the specifications under Item 1.1.
- plane-lapped seal faces.
- perpendicularity between the seal face and the shaft axis.
- unforced freedom of movement of the rotating parts within the specified tolerances.
- prevention of sedimentation on the surfaces of the shaft or shaft sleeve by e.g. crys-
tallization or polymerization.
- prevention of the product from adhering in the area of the seal gap.
- permanent seal film in the seal gap.
- adherence to the specified operating data as per § 1.1 and/or the data sheet.
If these operating requirements are not fulfilled the consumption of product, for
example, is increased or product constituents can escape into the atmosphere. Other
effects can include high component temperatures.
See the directive 94/4/EC and prEN 13463-5; issue 2002; section 4.4.3.
2.0 INFORMATION ON SAFETY
2.1 DANGER: This symbol means that failing to observe this information involves
the risk of personal injury and / or considerable damage to property.
IMPORTANT: This symbol draws your particular attention to important infor-
mation that is possibly not clear even to qualified personnel. This information,
however, must be observed to prevent malfunctions that in turn could directly
or indirectly give rise to serious injury and/or property damage.
EXPLOSION PROTECTION: This means that failure to observe these instruc-
tions will involve the risk of explosion in potentially explosive environments
which can cause harm to persons and / or considerable damage to property.
2.2 The customer and / or the operator must ensure that all persons assigned to handle,
assemble, and operate the mechanical seal have carefully read these operating instruc-
tions before they commence any installation, commissioning, or maintenance work.
Personnel attending to the installation and operation must be fully acquainted with the
layout and function of the MS and its supply system.
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