Shipbuilding -- Ship screw propellers -- Manufacturing tolerances

ISO 484-2:2015 defines manufacturing tolerances of ship screw propellers of a diameter between 0,80 m and 2,50 m. NOTE Some deviations for the tolerance are permitted in certain cases subject to the discretion of the customer or of the designer and the customer.

Construction navale -- Hélices de navires -- Tolérances de fabrication

General Information

Status
Published
Publication Date
18-Nov-2015
Current Stage
9060 - Close of review
Start Date
05-Mar-2021
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INTERNATIONAL ISO
STANDARD 484-2
Second edition
2015-12-01
Shipbuilding — Ship screw propellers
— Manufacturing tolerances —
Part 2:
Propellers of diameter between 0,80
and 2,50 m inclusive
Construction navale — Hélices de navires — Tolérances de
fabrication —
Partie 2: Hélices de diamètre compris entre 0,80 et 2,50 m inclus
Reference number
ISO 484-2:2015(E)
ISO 2015
---------------------- Page: 1 ----------------------
ISO 484-2:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 484-2:2015(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Field of application ............................................................................................................................................................................................ 1

4 Methods of measuring pitch ..................................................................................................................................................................... 1

4.1.1 Use of marking gauges ................................................................................................................................................ 1

4.1.2 Method with a graduated ring .............................................................................................................................. 1

4.1.3 Method using coordinate measuring machine....................................................................................... 2

5 Methods of measuring the thickness of the section ......................................................................................................... 2

6 Accuracy classes .................................................................................................................................................................................................... 3

7 Tolerances on the pitch .................................................................................................................................................................................. 4

8 Tolerances on the extreme radius of the screw propeller......................................................................................... 5

9 Tolerances on the thickness of the blade section ............................................................................................................... 5

10 Checking and tolerances of the form of blade sections ................................................................................................ 6

11 Tolerances of the length of the blade sections....................................................................................................................... 8

12 Tolerances on the location of blades, reference lines, and blade contours .............................................8

12.1 Marking of lines of reference ...................................................................................................................................................... 8

12.2 Tolerances on the contour of the leading edge ........................................................................................................... 9

12.3 Tolerances on the angular deviation between two consecutive blades ..............................................10

13 Tolerances on rake, axial position, and relative axial position of consecutive blades..............10

14 Surface finish .........................................................................................................................................................................................................11

15 Static balancing ...................................................................................................................................................................................................11

16 Measuring equipment ..................................................................................................................................................................................12

Bibliography .............................................................................................................................................................................................................................13

© ISO 2015 – All rights reserved iii
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ISO 484-2:2015(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information

The committee responsible for this document is ISO/TC 8, Ships and marine technology, Subcommittee

SC 3, Piping and machinery.

This second edition cancels and replaces the first edition (ISO 484-2:1981), which has been

technically revised.

ISO 484 consists of the following parts, under the general title Shipbuilding — Ship screw propellers —

Manufacturing tolerances:
— Part 1: Propellers of diameter greater than 2,50 m
— Part 2: Propellers of diameter between 0,80 m and 2,50 m inclusive
iv © ISO 2015 – All rights reserved
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ISO 484-2:2015(E)
Introduction

The propeller manufacturer is at liberty to use any equipment and method that enables the tolerances

to be verified to the required accuracy.
© ISO 2015 – All rights reserved v
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INTERNATIONAL STANDARD ISO 484-2:2015(E)
Shipbuilding — Ship screw propellers — Manufacturing
tolerances —
Part 2:
Propellers of diameter between 0,80 and 2,50 m inclusive
1 Scope

This part of ISO 484 defines manufacturing tolerances of ship screw propellers of a diameter between

0,80 m and 2,50 m.

NOTE Some deviations for the tolerance are permitted in certain cases subject to the discretion of the

customer or of the designer and the customer.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in technical product

documentation

ISO 1940-1:2003, Mechanical vibration — Balance quality requirements for rotors in a constant (rigid)

state — Part 1: Specification and verification of balance tolerances
3 Field of application

This part of ISO 484 applies to monobloc, built-up, and controllable pitch propellers.

4 Methods of measuring pitch

4.1 The principle of one method of measurement consists in setting out along a helicoidal line of

radius, r, a certain length, PQ, corresponding to the desired angle, α, and in measuring the difference, h, in

the heights of the points P and Q with respect to a reference plane (see Figure 1).

The length PQ shall be set out using one of the methods described in 4.1.1, 4.1.2 or 4.1.3.

NOTE Other methods giving the required accuracy may be used if necessary.
4.1.1 Use of marking gauges
The length PQ shall be set out by means of marking gauges.
4.1.2 Method with a graduated ring

The length PQ shall be set out by means of angle, α, on a part of a graduated ring of suitable radius

(see Figure 1).
© ISO 2015 – All rights reserved 1
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ISO 484-2:2015(E)
4.1.3 Method using coordinate measuring machine

The height coordinates are taken at defined measuring points by means of coordinate measuring

machine and they are related to each other (determination of height differences needed for pitch

evaluation). Both cartesian coordinate system (x, y, z) and polar coordinate system (α, r, h) can be

applied alternatively in order to define measuring points P and Q.
5 Methods of measuring the thickness of the section

5.1 The thickness of a cylindrical section at a point S shall be measured along direction SV (see

Figure 2) on the plane tangent to the coaxial cylinder and perpendicular to the pitch line of the pressure

side of the section (and only along direction SU perpendicular to the pressure side surface or direction S

parallel to the propeller axis when defined in this way on the drawings).
Key
1 small graduated ring
2 large graduated ring
Figure 1 — Pitch measurement
2 © ISO 2015 – All rights reserved
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ISO 484-2:2015(E)
V T S
Key
1 pressure side
2 suction side
3 cylindrical section
4 line of maximum thickness of section perpendicular to the pressure side
5 developed section perpendicular to the pressure side
6 developed cylindrical section
7 pressure side
Figure 2 — Thickness measurement

5.2 The maximum thickness at each radius shall be determined by means of a pair of outside callipers

or from the profile obtained by plotting the thickness at various points: S, S , S , S , etc.

1 2 3
6 Accuracy classes

The accuracy class shall be selected by the customer. The indications in Table 1 serve as guidance

in this choice.
Table 1 — Accuracy of manufacturing
Class Manufacturing accuracy
S Very high accuracy
I High accuracy
II Medium accuracy
III Wide tolerances
© ISO 2015 – All rights reserved 3
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ISO 484-2:2015(E)
7 Tolerances on the pitch
Table 2 — Pitch tolerances
Class
Designation of pitch
S I II III
a) Local pitch ±1,5 % ±2 % ±3 %
with a minimum of ±10 mm ±15 mm ±20 mm
b) Mean pitch per radius of
±1 % ±1,5 % ±2 % ±5 %
each blade
with a minimum of ±7,5 mm ±10 mm ±15 mm ±25 mm
c) Mean pitch per blade ±0,75 % ±1 % ±1,5 % ±4 %
with a minimum of ±5 mm ±7,5 mm ±10 mm ±20 mm
d) Mean pitch for propeller ±0,5 % ±0,75 % ±1 % ±3 %
with a minimum
...

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