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Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

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है”ह”ह

IS 15545-5 (2004): Rorary shaft lip type sealsincorporating thermoplastic sealing elements, Part 5:Identification of visual imperfections [MED 30: Gaskets andPacking]

IS 15545( Part 5 ): 2004ISO 16589-5:2001

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Indian Standard

ROTARY SHAFT LIP-TYPE SEALS INCORPORATINGTHERMOPLASTIC SEALING ELEMENTS

PART 5 IDENTIFICATION OF VISUAL IMPERFECTIONS

ICS 23.100.60; 83.140.50

@ BIS 2004

BUREAU OF INDIAN STANDARDSlvlANAK BHAVAN, 9 BAHAIXJR SHAH ZAFAR MARG

NEW DELHI 110002

December 2004 Price Group 8

Basic Fluid Power Sectional Committee, MGP 14

NATIONAL FOREWORD

This Indian Standard ( Part 5 ) which is identical with ISO 16589-5:2001 ‘Rotary shaft lip-type sealsincorporating thermoplastic sealing elements — Part 5: Identification of visual imperfections’ issuedby the International Organization for Standardization ( ISO ) was adopted by the Bureau of IndianStandards on the recommendations of the Basic Fluid Power Sectional Committee and approval of theMedical Instruments, General and Production Engineering Division Council.

Rotary shaft lip-type seals are used to retain fluid in equipment where the differential pressure isrelatively low. Typically, the shaft rotates and the housing is stationary, although in some applicationsthe shaft is stationary and the housing rotates.

Dynamic sealing is normally the result of a designed interference fit between the shaft and a flexibleelement incorporated in the seal.

Similarly, a designed interference fit between the outside diameter of the seal and the diameter of thehousing bore retains the seal and prevents static leakage.

Careful storage, handling and proper installation of all seals are necessary to avoid hazards, both priorto and during installation, which would adversely affect service life.

The text of the ISO Standard has been approved as suitable for publication as an Indian Standardwithout deviations. Certain conventions are, however, not identical to those used in Indian Standards.Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should beread as ‘Indian Standard’.

b) Comma ( , ) has been used as a decimal marker in the International Standard while in IndianStandards, the current practice is to use a point ( J) as the decimal marker.

CROSS REFERENCES

In this adopted standard reference appears to certain International Standards for which Indian Standardsalso exist. The corresponding Indian Standards which are to be substituted in their places are listedbelow along with their degree of equivalence for the editions indicated:

International Standard Corresponding Indian Standard Degree of Equivalence

ISO 5598 : 1985 Fluid power IS 10416 : 1992 Fluid power Identicalsystems and components — systems and components —Vocabulary Vocabulary ( first revision)

ISO 16589-2:2001 Rotary shaft IS 15545 ( Part 2 ) :2004 Rotary dolip-type seals incorporating shaft lip-type seaIs incorporatingthermoplastic sealing elements — thermoplastic sealing elements:Part 2: Vocabulary Part 2 Vocabulary

Under the general title, Rotary shaft lip-type seals incorporating thermoplastic sealing elements, thereare five parts as per following:

IS 15545 ( Part 1 ) :2004 Nominal dimensions and tolerances

IS 15545 ( Part 2 ) :2004 Vocabulary

IS 15545 ( Part 3 ) :2004 Storage, handling and installation

IS 15545 ( Part 4 ) :2004 Performance test procedures

IS 15545 ( Part 5 ) :2004 Identification of visual imperfections

( Contirtuedon third cover)

IS 15545( Part 5 ): 2004ISO 16589-5:2001

CONTENTS

1 Scope

2 Normative references

3 Terms and definitions

4 Characteristic imperfections

4.1 Definition of sealing lip contact area

4.2 Typical imperfections

4.3 Visual imperfections on seals with additional components

5 Identification statement ( Reference to this part of ISO 16589 )

Page

1

1

1

1

1

1

2

2“

i

..

IS 15545 (Part 5):2004

ISO 16589-5:2001

hdian Standard

ROTARY SHAFT LIP-TYPE SEALS INCORPORATINGTHERMOPLASTIC SEALING ELEMENTS

PART 5 IDENTIFICATION OF VISUAL IMPERFECTIONS

1 Scope

ISO 16589 describes seals utilizing sealing elements manufactured from suitably formulated compounds, based onthermoplastic materials, such as polytetrafluoroethylene (PTFE).

NOTE ISO 16589 is complementary to ISO 6194 which covers elastomeric seals.

This part of ISO 16589 defines and classifies typical surface imperfections that could impair the function of theseals, and is intended as a convenience for purchasers and manufacturers in their discussions about theimportance of these imperfections in different applications.

2 Normative references

The following normative documents contain provisions which, through reference in this text, constitute provisions ofthis part of ISO 16589. For dated references, subsequent amendments to, or revisions of, any of these publicationsdo not apply. However, parties to agreements based on this part of ISO 16589 are encouraged to investigate thepossibility of applying the most recent editions of the normative documents indicated below. For undatedreferences, the latest edition of the normative document referred to applies. Members of 1S0 and IEC maintainregisters of currently valid International Standards.

ISO 5598:1985, Fluid power systems and components — Vocabulary

ISO 16589-2:2001, Rotary shaft lip-type seals incorporating thermoplastic sealing elements — Part 2: Vocabulary

3 Terms and definitions

For the purposes of this part of ISO 16589, the terms and definitions given in ISO 5598 and ISO 16589-2 apply.

4 Characteristic imperfections

4.1 Definition of sealing lip contact area

See Figure 1.

4.2 Typical imperfections

Some typical imperfections are shown in Figures 2 to 19 and listed in Tables 1 and 2.

1

IS 15545 (Part 5):2004

ISO 16589-5:2001

4.3 Visual imperfections on seals with additional components

4.3.1 Outer circumference portion

The imperfections on the outer circumference portion are the following:

a) scratch;

b) incorrect chamfer;

c) incomplete bond.

4.3.2 Minor lip

The imperfections on the minor lip are the following:

a) tear;

b) cut or nick;

c) non-fill;

d) flash.

5 Identification statement (Reference to this part of ISO 16589)

Manufacturers are strongly recommended to use the following statement in test reports, catalogues dnd salesliterature when electing to comply with this part of ISO 16589:

“The visual imperfections and assembly faults are in accordance with ISO 16589-5:2001, Rotary shaft lip-typeseals incorporating thermoplastic sealing elements — Part 5: Identification of visual imperfections.”

.

\

IS 15545 (Part 5):2004

ISO 16589-5:2001

-1

a\1- \ A

NOTE In cases of wear, imperfections in the sealing lip contact area can impair the function of the rotary shaft lip-type sealduring its lifetime. This dimension may vary according to the design standards of individual manufacturers.

a Sealing lip contact area

Figure 1 — Sealing lip contact area

3

IS 15545 (Part 5) :2004ISO 16589-5:2001

a) Before lip has been formed

L

13

12

b) After lip has been formed

Figure 2 — Typical imperfections

4

Figure 2

Item No.

1

2

3

4

5

6

7

8

9

10

11

12

13

Table 1 — Typical visual imperfections

Description

Sealing element reversal(hydrodynamic aid on the inside)

Nick

Incorrect hydrodynamic aid feature

Uneven outer diameter sealant

cut

Crack

Inclusion

Polymer window

Tear

Filler projections

Gasket extrusion

Sealing lip inversion

IrrcomDlete trim

IS 15545 (Part 5) :2004

ISO 16589-5:2001

Detail illustration

Figure No.

3

4

—

—

5

6

7

8

9

10

11

12

13

Table 2 — Typical miscellaneous imperfections

Description

Incorrect hydrodynamic aid feature

Rough surface finish, sealing element

Incorrect roll-over of retaining flange

Missing gasket

Lip eccentric to outer-case diameter(incorrectly formed on mandrel)

Lip eccentric to outer-case diameter(outer diameter of sealing element undersized)

Detail illustration

Figure No.

14

15

16

17

18

19

5

IS 15545 (Part 5) :2004

1S0 16589-5:2001

Figure 3 — Sealing element reversal (hydrodynamic aid on the inside)

Figure 4 — Nicks

IS 15545 (Part 5) :2004

ISO 16589-5:2001

Figure 5 — Cut

7

IS 15545 (Part 5) :2004

ISO 16589-5:2001

\

Figure 6 — Crack

8

IS 15545 (Part 5):2004

ISO 16589-5:2001,

)

Figure 7 — Inclusion

IS 15545 (Part 5) :2004

ISO 16589-5:2001

Figure 8 — Polymer window

10

IS 15545 (Part 5):2004

ISO 16589-5:2001

Figure 9 — Tear

IS 15545 [Part 5) :2004

ISO 16589-5:2001

Figure 10 — Filler projections

Figure 11 — Gasket extrusion

12

IS 15545 (Part 5) :2004

ISO 16589-5:2001

Figure 12 — Sealing lip inversion

\

dL

—————=. —

Figure 13 — Incomplete trim or folded flash

IS 15545 (Part 5) :2004

ISO 16589-5:2001

—

a) Correct spiral direction: Hydrodynamic aid feature to suit clockwise rotating shaft

when viewed from backside (air side)

b) Incorrect spiral direction

Figure 14 — Example of correct and incorrect spiral directions

14

IS 15545 (Part 5):2004ISO 16589-5:2001

a) Acceptable

—.

{

b) Unacceptable

Illustration of a rough surface finish of a plain lip element, for example machining grooves.

Figure 15 — Rough sutiace finish, sealing element

-----

IS 15545 (Part 5) :2004

ISO 16589-5:2001

l--u DE ISections shown at 180° through a seal

Figure 18 — Lip eccentric to outer-case diameter(incorrectly formed on mandrel)

I

SF I

Sections shown at 180° through a seal

Figure 19 — Lip eccentric to outer-case diameter(outer diameter of sealing element undersized)

17

( Continued from second cover)

For the purpose of deciding whether a particular requirement of this standard is complied with, the finalvalue, observed or calculated, expressing the result of a test or analysis, shall be rounded off inaccordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )’. The number ofsignificant places retained in the rounded off value should be the same as that of the specified value inthis standard.

,,

.

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau o//ndian Startdarcfs Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification ofgoods and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications maybe reproduced in anyform without the prior permission in writing of BIS. This does not preclude the free use, in the courseof implementing the standard, of necessary details, such as symbols and sizes, ‘type or gradedesignations. Enquiries relating to copyright be addressed to the Director (Publications), BIS.’

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards arealso reviewed periodically; a standard along with amendments is reaffirmed when such reviewindicates that no changes are needed; if the review indicates that changes are needed, it is takenup for revision. Users of Indian Standards should ascertain that they are in possession of the latestamendments or edition by referring to the latest issue of ‘BIS Catalogue’ and ‘Standards : MonthlyAdditions’.

This Indian Standard has been developed from Doc : No. MGP 14( 396).

Amendments Issued Since Publication,

Amend No. Date of Issue Text Affected

BUREAU OF INDIAN STANDARDS

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