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IS 13870-2 (1993): Cranes and Lifting Appliances -Selection of Wire Ropes, Part 2: Mobile Cranes -Coefficient of Utilization [MED 10: Wire Ropes and WireProducts]

IS13870( Part2): 1993 IS0 4308-2 : 1988

Indian Standard

CRANES AND LIFTING APPLIANCES - SELECTION OF WIRE ROPES

PART 2 MOBILE CRANES - COEFFICIENT OF UTILIZATION

UDC 621’873’2/3 : 677’721

(0 BIS 1993

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

December 1333 Price Group 1

Wire Ropes and Wire Products Sectional Committee, HMD 1G

NATIONAL FOR-EWORD

This Indian Standard which is identical with IS0 4308-2 : 1988 ‘Cranes and lifting appliances - Selection of wire ropes - Part 2 Mobile cranes - Coefficient of utilization’, issued by the International Organization for Standardization ( IS0 ), was adopted by the Bureau of Indian Standards on the recommendation of the Wire Ropes and Wire Products Sectional Committee ( HMD IO ) and approval of the Heavy Mechanical Engineering Division Council.

This standard has been issued in two parts. The other part of the Standard is:

IS 13870 ( Part 1 ) : 1993 Cranes and lifting appliances - Selection of wire ropes : Part 1 General

The text of IS0 standard has been approved for -publication as Indian Standard without 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 be read as ‘Indian Standard’.

b) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current practice is to use a full stop ( . ) as the decimal marker.

+

In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the editions indicated.

International Standard Corresponding Indian Standard Degree of Equivalence

IS0 4301-2 : 1985

IS0 4306-2 : 1985

IS0 4308-I : 1986

IS 13834 ( Part 2 ) : 1993 Cranes - Classifi- cation : Part 2 Mobile cranes

IS 13473 ( Part 2 ) : 1992 Cranes - Vocabu- larly : Part 2 Mobile cranes

IS 13870 ( Part 1 ) : 1993 Cranes and lifting appliances - Selection of wire ropes - Part 1 General

Identical

Identical

Identical

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

IS 13870 ( Part 2 ) : 1993 IS0 4308-2 :Y 888

Indian Standard

CRANES AND LIFTING APPLIANCES - SELECTION OF WIRE ‘ROPES

PART 2 MOBILE CRANES - COEFFICIENT OF UTILIZATION

0 Introduction

This part of IS0 4308 is one of a series covering selection of wire ropes for cranes and lifting appliances. The series will con- sist of the following parts :

Part 1: General.

Part 2: Mobile cranes - Coefficient of utilization.

Part 3: Tower cranes.

Part 4: Portal and pedestal cranes.

Part 5: Overhead travelling and portal bridge cranes.

1 Scope and field of application

This part of IS0 4308 establishes the values of the minimum practical coefficient of utilization, Z,, asdefined in IS0 4308-1, for ropes and rotation-resistant ropes used on mobile cranes.

It applies to all mobile cranes as defined in IS0 4306-2.

2 References

IS0 4301-2, Lifting Mobile cranes.

appliances - Classification - Part 2:

IS0 4306-2. Lifting appliances - Vocabulary - Part2: Mobile cranes.

IS0 4308-1, Cranes and lifting appliances - Selection of wire ropes - Part 7: General.

3 Coefficient of utilization, 2,

3.1 General purpose ropes

The minimum coefficient of utilization, Z,,, in accordance with the crane and mechanism classification given in IS0 4301-2 is presented in table 1, for general purpose ropes.

Table 1 - General purpose ropes’)

Running ropes Stationary ropes Crane

operating Crane Hoisting Luffing and telescoping

conditions classification Erection Mechanism ..Z Mechanism

Working Working Erection

classification P classification ZP ZP 2, ZP

General Al M3 3,55 rdl2 3,35 3,05 3 2,73 Constant A3 M4 4 M3 3.55 3,05 3 2,73

Heavy A4 M5 4,5 M3 3.55 3,05 3 2.73

11 It is understood that safety of ropes in use relies on the application of criteria for rope examination and discard.

1

IS 13870 ( Part 2 ) : 1993 IS0 4308-2 : 1988 .

3.2 Rotation-resistant ropes The minimum coefficient of utilization, Z,, for rotation- resistant ropes as classified in IS0 4301-2 is presented in

A rotation-resistant rope.is one~having eight or more strands in

an outer layer which is spun helically in the opposite direction to the layer beneath.

table 2.

Table 2 - Rotation-resistant ropes11

Crane operating conditions

Crane classification

Running ropes for hoisting

2,

t

I I

General I Al 4.; Constant

I

A3 5;6 Heavy A4 5,6 I

1) Table 2 relates to “conventional” types of rotation-resistant ropes. With the advent of newer types of rotation-resistant ropes, future study may allow different coefficients of utilization.

*

2 Reprography Unit, BIS, New Delhi, India

.

I

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I producers may be obtained from the Bureau of Indian Standards.

.

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Dot : No. HMD 10 ( 0191 )

Amendments Issued Since Publication

Amend No. Date sf Issue Text Affected

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