Flowserve ISC - Manual (Page 2)

ISC Innovative Standard Cartridge Seal - Installation Instructions for Machinery Components
housing, e.g. a pump shaft against a pump casing. The stationary components will
consist of a seal ring and (depending on the design) a spring-loaded element. The
spring-loaded element can be a spring or a bellows. The seal ring is sealed against
the housing with a secondary gasket, e.g. an O-ring. The rotating components will
consist of a seal ring and (depending on the design) a spring-loaded element. The
spring-loaded element can be a spring or a bellows. The seal ring is sealed against
the shaft with a secondary gasket, e.g. an O-ring. A mechanical seal can be sup-
plied as a pre-assembled cartridge or in separate components. Assembly is done
in accordance with the assembly drawing. A mechanical seal will run in the pumped
product or external source fluid.
To provide lubrication, a film of liquid must always be present between the seal
faces. The sealing surfaces are separated from each other by the seal liquid film
during shaft rotation and in principle run without contact and thus minimal wear
under these conditions.
1.3 Explosion Protection
The ISC mechanical seal is a standard cartridge seal and as such regarded as a
machine element. Machine elements do not need to comply with Directive 94/9/EC
(ATEX 95 product guide) as these are regarded as an integral part of a larger piece
of machinery (pump, agitator). This has been confirmed by both the EC ATEX
standing committee as well as the European Sealing Association (ESA).Reference
is made to following web-sites:
EC ATEX standing committee: http://ec.europa.eu/enterprise/atex/rotating.htm
ESA position statement: http://www.europeansealing.com/statements.html
For applications which require information on expected surface temperatures of the
mechanical seal faces, Flowserve document “ATEX 17 information declaration” is
available upon request. This document allows users to determine typical surface
temperatures based upon seal design, operating conditions and face materials and
may be used by the users to comply with ATEX 1999/9/EC (ATEX 17).
1.4 Functional Requirements
The proper functioning of a mechanical seal is only achieved once the following
conditions have been met:
• The sealing surfaces are lapped within specification
• Perpendicularity and concentricity between the shaft and the seal chamber face
and bore respectively
• Freedom of movement of the spring loaded components in axial direction
• Axial and radial shaft movements within Flowserve or OEM tolerances whichever
is the tightest
This ISC seal is a cartridge mounted mechanical seal, designed for ease of installation and
reliable operation. No seal setting dimensions are required. Removable centering tabs
provide proper alignment. The ISC seal family consists of:
ISC1PX - Single Pusher Seal stationary springs
ISCPP - Dual Pusher Seal stationary springs
ISC1BX - Single Metal Bellows Seal rotating bellows (standard)
ISCBB - Dual Metal Bellows Seal rotating bellows (standard)
ISC1SX - Single Metal Bellows Seal stationary bellows (optional)
ISCSS - Dual Metal Bellows Seal stationary bellows (optional)
The flexible stator pusher design compensates for inadvertent misalignment of the seal
chamber face. Multiple springs provide uniform face loading and are external of the process
fluid, resisting clogging and stress corrosion.
The bellows design is available in both rotating and stationary bellows arrangements.Rota-
ting bellows arrangements are used when the self cleaning feature is required and stationa-
ry bellows are used to compensate for misalignment of the seal chamber face.
Installation according to the following steps will assure long trouble free life of the seal.
1. Drawing, Brief Description, Explosion Protection, Functional Requirements
This mechanical seal is designed to provide reliable performance under a wide
range of operating conditions. The information and specifications presented in
this product brochure are believed to be accurate, but are supplied for information
purposes only and should not be considered certified or as a guarantee of satisf-
actory results by reliance thereon. Nothing contained herein is to be construed as
a warranty or guarantee, express or implied, with respect to the product.
Although Flowserve Corporation can provide general application guidelines, it
cannot provide specific information for all possible applications.
The purchaser/user must therefore assume the ultimate responsibility for the
proper selection, installation, operation and maintenance of Flowserve products.
Because Flowserve Corporation is continually improving and upgrading its product
design, the specifications, dimensions and information contained herein are sub-
ject to change without notice.
1.1 Assembly Drawing
The assembly drawing is included in the shipping box with the mechanical seal.
1.2 Brief Description
A mechanical seal is a device designed to seal a rotating shaft against a stationary
!