Flowserve 955 User Manual
AND MAINTENANCE
Chemiepac
955, 956, 958, 970, 971, 978
INSTALLATION,
OPERATING,
INSTRUCTIONS
Experience In Motion
Experience In Motion
To seal*
Machine manufacturer :
Machine type :
End user :
Plant :
Works standard :
Drawing number : see details based on the order
Article ident. number : see details based on the order
Table of Contents
1.0 Brief description, function
2.0 Information on safety
3.0 General
4.0 Transport, storage
5.0 Preparing for installation
6.0 Installation
7.0 Connecting the fluid supply
8.0 Starting up, operation
9.0 Shutting down, removal
10.0 System check
11.0 Maintenance, replacement parts, aftersales service
IMPORTANT!
CAREFULLY READ AND OBSERVE THESE INSTRUCTIONS AND THE INFORMATION ON
SAFETY BEFORE HANDLING OR STARTUP
FIELD OF OPERATIONS AND PERMITTED USE
The FLOWSERVE CHEMIEPAC is intended exclusively for the sealing of liquids in pumps. All other
instances of use are not permissible. The manufacturer is not liable for any damage incurred through
non-permitted use; the risk is borne by the user alone.
* Should details based on the order not be given, the user shall be responsible for the assignment
according to permitted use.
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Installation, Operating and Maintenance Instructions Chemiepac Mechanical Seal
1.0 BRIEF DESCRIPTION, FUNCTION
1.1 Specifications for the operations described herein:
Application limits
Product pressure p (bar) depending on temperature see catalogue
Speed v (m/s) 8
Product temperature t (°C) to 125° C type 970...
to 100° C type 950...
The application limits specified are maximum load values and assist in preselection.
The application limits must be checked for every application.
A warranty in an individual case is possible only when FLOWSERVE knows the exact
application conditions and these have been confirmed in a separate agreement.
1.2 Surface temperature of seal faces:
The temperature class as per EN 13463-1 is based on the expected surface temperature of the faces. The difference between the medium temperature and the surface
temperature of the faces depends on various factors.
The annexed diagram shows how the temperature class can be calculated on the basis
of a temperature difference obtained in practice.
1.3 Brief description
The CHEMIEPAC is a partially assembled mechanical seal system designed to seal
rotating shafts with respect to stationary housings, e.g. a pump shaft with respect to
the housing.
The CHEMIEPAC consists of two units:
The stationary unit is the mating ring (4) with corresponding flat gasket (5). One face
of the mating ring is designed as a seal face, the opposite face is marked “no seal
face”. The mating ring and flat gasket must be connected tightly to the pump housing.
The rotating unit comprises the components 1-3, 6-10, 14 and 15 for the CHEMIEPAC
955, 956 and 958, and 1-3, 6-15 for the CHEMIEPAC 970, 971 and 978. The main
component is the elastic bellows of PTFE that the two-part drive bolts tightly and free
of twisting to the shaft. The face of the bellows is designed as a seal face.
Near the seal face the mechanical properties of the PTFE material are enhanced by
additives. An exchangeable seal ring is available for the CHEMIEPAC 970,971 and 978.
A spring plate (6) is locked along the axis and free of twisting with the bellows and
has built-in springs (3) that are supported in the axial direction against the drive. In
the installed state, the seal faces of the stationary mating ring and the seal face of the
bellows form the seal gap through mutual elastic contact. The medium is sealed from
the atmosphere at the seal gap. The sealing effect is generated by the bellows’ spring
pretension and reinforced by the hydraulic closing force arising from the pressure
exerted by the sealing medium.
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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 nonwearing 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).
! 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 instructions 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 instructions 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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