IS 15053: Shipbuilding - Hydraulic Steering Gears for Vessels Below 500 GRT - General Requirements

13 Pages·2001·1.3 MB·English

by  Bureau of Indian Standards

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IS 15053 (2001): Shipbuilding - Hydraulic Steering Gears
for Vessels Below 500 GRT - General Requirements [TED 19:
Marine Engineering and Safety Aids]
“!ान $ एक न’ भारत का +नम-ण”
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Is 15053:2001

Indian Standard
SHIPBUILDING — HYDRAULIC STEERING
GEARS FOR VESSELS BELOW 500 GRT —
GENERAL REQUIREMENTS
ICS 47.020.70

0 BIS 2001
BUREAU OF IN DIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
December200 I Price Group 3
Marine Engineering and Safety Aids Sectional Committee, TED 19
FOREWORD
This Indian standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Marine
Engineering and Safety Aids Sectional Committee had been approved by Transport Engineering Division
Council.
Steering gear provides mechanism foreffecting movement oftherudder forthepurpose ofsteering thevessel.
Since steering gear isof critical application inany seagoing vessel itisrequired to beof sound construction,
fault free operation andhastohave inbuih safeguards.
This standard hasbeendevided insixsections:
Section 1 General
Section 2 Performance
Section 3 Construction anddesign
Section 4 Steering control systems
Section 5 Electric power circuits, electric control circuits, monitoring and alarms
Section 6 Testing andtrials
The composition oftheCommittee responsible forformulation ofthisstandard isgiven inAnnex A.
For thepurpose ofdeciding whether aparticular requirement ofthisstandard iscomplied with,thefinal value,
observed or calculated, expressing the result of a test or analysis, shallberounded offinaccordance with
IS 2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant placed retained in
therounded off value should bethesameasthatofthespecified valueinthis standard.
AMENDMENT NO. 1 OCTOBER 2010
TO
IS 15053 : 2001 SHIPBUILDING — HYDRAULIC
STEERING GEARS FOR VESSELS BELOW 500 GRT —
GENERAL REQUIREMENTS
[Page 2, clause 7.3(b)] — Substitute the following for the existing matter:
'Capable of putting the rudder over from 15° on one side to 15° on the other side
in not more than 60 seconds with the ship at its deepest seagoing draught and
running ahead at one half of the maximum ahead service speed or 7 knots,
whichever is greater '; and
(Page 4, table, Row 3) — Substitute the following for the existing matter:
Steering Level Low Bridge + main
gear control station
hydraulic (for each tank
oil tank separately)

(TED 19)
Reprography Unit, BIS, New Delhi, India
IS 15053:2001
Indian Standard
SHIPBUILDING — HYDRAULIC STEERING
GEARS FOR VESSELS BELOW 500 GRT —
GENERAL REQUIREMENTS
1 SCOPE 3.5 Power Actuating System
This standard specifies requirements pertaining to The hydraulic equipment provided for supplying
design andconstruction ofsteeringgearforsea-going power toturn the rudder stock, comprising asteering
vesselsbelow 500grt. gearpowerunitorunits,together withassociatedpipes
and fittings, and a rudder actuator. The power
2 REFERENCE
actuating systems may share common mechanical
The following standard contain provisions which components, for example, tiller quadrant and rudder
through reference in this text, constitute provision of stock, orcomponents serving thesamepurpose.
this standard. At the time of publication, the edition
3.6 Rudder Actuator
indicated was valid. All standards are subject to
revision, and parties to agreements based on this The component which converts directly hydraulic
standard are encouraged to investigate thepossibility pressure into mechanical action to move therudder.
of applying the most recent edition of the standard
3.7 Steering Gear Control Systems
indicatedbelow:
The equipment by which orders aretransmitted from
ISNo. Title
thenavigating bridge tothesteering gearpower units.
2825:1969 Code for unfired pressure vessels Steering gear control systems comprise transmitters,
receivers, hydraulic control pumps and their
SECTION 1 GENERAL associated motors, motor controllers, piping and
cables.
3 DEFINITIONS
3.8 Steering Gear Power Unit
For thepurpose ofthisstandard following definitions
shall apply. a) in the case of electro-hydraulic steering gear,
an electric motor and its associated electrical
3.1 Auxiliary Steering Gear equipment andconnected pump; and
Theequipment otherthananypartofthemainsteering b) in the case of other hydraulic steering gear, a
gear necessary to steerthe shipintheevent offailure driving engine andconnected pump.
of the main steering gear but not including the tiller,
4 INSTALLATION
quadrant orcomponents serving thesamepurpose.
The steering gear shall be secured to the seating by
3.2 Main Steering Gear
bolts and suitable chocking arrangements shall be
The machinery rudder actuator(s), the steering gear provided. The seating shall be of substantial
power units, if any, and ancillary equipment and the construction.
means of applying torque to the rudder stock (for
5 MATERIALS
example, tiller or quadrant) necessary for effecting
movement of the rudder for the purpose of steering 5.1 All the steering gear components and the rudder
the shipundernormal service conditions. stockshallbeof sound andreliable construction.
3.3 Maximum Ahead Service Speed 5.2 Allcomponents transmitting mechanical forcesto
the rudder stock shall be manufactured and tested
The greatest speed which the ship is designed to
accordhg to the relevant requirements of applicable
maintain in service at sea at its deepest seagoing
Indian Standards.
draught.
5.3 Ram cylinders; hydraulic power piping; flanges
3.4 Maximum Working Pressure
and fittings; and all steering gear components
The expected pressure in the system when steering transmitting mechanical forces to the rudder stock
gear isoperated tocomply with7.2 (b). (such as tillers, quadrants, or similar components)

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IS 15053:2001
shallbeofsteelorotherequivalent ductilematerial.In a) in a cargo ship, the main steering gear is
general, such material shall nottohave anelongation capable ofoperating therudder asrequired by
oflessthan 12percentnoratensile strength inexcess 7.2 (b) while operating with all power units;
of 600 N/mm*. The use of ductile (nodular) iron and
castings shall be acceptable for pressure housing of b) themainsteering gear isarranged sothatafter
rotary vane type actuators and valves. asinglefailure initspiping systemorinoneof
the power units the defect can be isolated so
6 RUDDER, RUDDER STOCK, TILLER AND
that steering capability isregained.
QUADRANT
7.5 Mainandauxiliary steeringgearpower unitsshall
Rudder, rudder stock, tiller and quadrant shall be
be:
designed in accordance with the requirements of
applicable Rules oftheClassification Societies. a) arranged tore-start automatically whenpower
isrestored after apower failure;
SECTION 2 PERFORMANCE b) capable of being brought into operation from
a position on the navigating bridge. In the
7 GENERAL
event of a power failure to the steering gear
7.1 Unless the main steering gear comprises two or power units,anaudible and visual alarm shall
more identical power units, every ship shall be begiven onthenavigating bridge; and
provided with a main steering gear and an auxiliary c) arranged sothat transfer between unitscan be
steering gear.Themainsteeringgearandtheauxiliary readiiy effected.
steering gear shall be so arranged that the failure of
7.6 A means of communication shall be provided
oneofthem shallnotrendertheotheroneinoperative.
between the navigating bridge and the steering gear
7.2 The main steering gearandrudder stockshallbe: compartment.
a) Of adequate strength and capable of steering 7.7 Manually operated gears shallonlybeacceptable
the shipatmaximum ahead speed; when the operation does not require an effort
b) Capable ofputting therudderoverfrom35°on exceeding 160Nunder normal conditions.
one side to35° ontheother sidewiththe ship
8 RUDDER ANGLE LIMITERS
at its deepest seagoing draught and running
ahead at maximum ahead service speed and Power-operated steering gears shallbe provided with
under the sameconditions, from 35°oneither positive arrangements, such as limit switches, for
side to 30° on the other side innot more than stopping thegearbefore therudder stops arereached. . ---
28 seconds; These arrangements shall be synchronized with the
i
c) Operated by power where necessary to meet gear itself andnot with the steering gear control. j
the requirements of (b) and in any case when .
rudder stock over 120mm diameter inwayof SECTION 3 CONSTRUCTION AND DESIGN
the tiller isprovided; and
9 GENERAL
d) So designed thatthey shall notbedamaged at
maximum astern speed. 9.1 Rudder actuators shallbedesigned inaccordance
with the relevant requirement of IS 2825 with joint
7.3 The auxiliary steering gear shallbe:
being designed for 100percent efficiency factor.
a) Of adequate strength and capable of steering
9.2 Accumulators, if fitted, shall comply with the
the ship at navigable speed and of being
requirements of9.1.
brought speedily intoaction inanemergency;
b) Capableofputtingtherudderoverfrom 15°on 9.3 Allweldedjoints within thepressure boundary of
one side to 15°on the other side in not more a rudder actuator or connecting parts transmitting
than 60 seconds with the ship at its deepest mechanical loads shall be full penetration type or of
seagoing draft and running ahead service equivalent strength.
speedor7knots, whichever isthegreate~ and
9.4 The construction shall be such as to minimize
c) Operated by. .power where necessary to meet localconcentration ofstress.
the requirements of (b) and inany case when
rudder stock over 230 mmdiameter inwayof 9.5 The design pressure for calculation to determine
the tiller isprovided. the scantlings of piping and other steering gear
components subjected to internal hydraulic pressure
7.4 Where the main steering gear comprises two or
shall be at least 1.25 times the maximum working
more identical power units,anauxiliary steering gear
pressure to be expected under the operational
neednotbefitted, provided that:
conditions specified in7.2(b) taking into account any

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...
+
IS 15053:2001
;
pressurewhichmayexistinthelowerpressure sideof pipestotheactuators, andshallbedirectly fittedtothe ,r
thesystem. actuator. Arrangements for bleeding air from the -.-,
.,
hydraulic system shallbeprovided, where necessary.
9.6 Thepermissibleprimarygeneralmembrane stress
shallnotexceed thelower ofthefollowing values: 11.2 Relief valves shall be fitted to any part of the
hydraulic system which can be isolated and in which ,,p.
“,;
@ 1, ,
—or% pressure can be generated from the power source or
A
from external forces. The setting of the relief valves
‘,
where shallnotexceed thedesign pressure. The valves shall j
be of adequate size and so arranged as to avoid an
~B = specified minimum tensile strength of
undue riseinpressure above thedesign pressure.
material atambient temperature, and
specified minimum yield stress or 11.3 Relief valves, for protecting any part of the
=Y = hydraulic system which can be isolated, required
0.2 percent proof stress of the material,
by 11.2shallcomply with thefollowing:
atambient temperature,
a) The setting pressure shall not to be less than
The valuesofA and Baregiven below:
1.25 times the maximum working pressure;
Wrought Cast Nodular Cast
and
Steel Steel Iron
b) The minimum discharge capacity of therelief
A 3.5 4 5 valve(s) shallnottobelessthan 110percentof
B 1.7 2 3 the total capacity of the pump which can be
delivered through it(them). Undersuchcondi-
10 COMPONENTS
tions the rise in pressure shall not exceed 10
10.1 All steering gear components transmitting
per cent ofthe setting pressure. Inthis regard,
mechanical forces to the rudder stock, which are not
due consideration shall be given to extreme
protected against overload by structural rudder stops
foreseen ambient conditions in respect of oil
or mechanical buffers, shall have a strength at least
) viscosity.
i equivalent to that of the rudder stock in way of the
tiller. 12 FLEXIBLE HOSES
10.2 Oil seals between non-moving parts, forming 12.1 Hose assemblies may be installed between two
part oftheexternal pressure boundary, shallbeofthe points where flexibility is required but are not
metaltype orofanequivalent type. subjected to torsional deflection (twisting) under
normaloperating conditions. Ingeneral, thehoseshall
10.3 Oilsealsbetween moving parts,forming partof
be limited to the length necessary to provide for
theexternal pressure boundary, shallbeduplicated, so
flexibility andforproper operation ofmachinery.
thatthefailureofonesealdoesnotrender theactuator

inoperative. Alternative arrangements providing 12.2 Hoses shall be high pressure hydraulic hoses

equivalent protection against leakage may be according torecognized standards andsuitable forthe
accepted. fluids,pressures,temperatures andambientconditions
inquestion.
10.4 Hydraulic poweroperated steeringgearsshallbe
provided with the: 12.3 Burstpressureofhosesshallnotbelessthanfour
timesthedesign pressure.
a) arrangements tomaintainthecleanlinessofthe
hydraulic fluid taking into consideration the SECTION 4 STEERING CONTROL SYSTEMS
type anddesign ofthehydraulic system; and
b) afixed storage tankhaving sufficient capacity 13 GENERAL
torecharge atleastonepoweractuating system 13.1 Steering gearcontrol shallbeprovided:
including thereservoir,wherethemainsteering
gear is required to b power operated. The a) Forthemainsteeringgear,bothonthenavigat-
storagetankshallbepemmnentlyconnectedby ing bridge and in the steering gear compart-
piping in suchamannerthatthehydraulicsys- ment
tems can be readily recharged from aposition b) Where the main steering gear is arranged
within the steering gear compartment and according to 7.4, by two independent control
provided with acontents gauge. systems, both operable from the navigating
bridge.Thisdoesnotrequire duplication ofthe
11 VALVE AND RELIEF VALVE ARRANGE-
steering wheel or steering lever. Where the
MENT
control system consists of a hydraulic
11.1 For all vessels with non-duplicated actuators, telemotor, second independent system need
isolating valves shall be fitted at the connection of notbefitted: and

3
IS 15053:2001
c) Fortheauxiliary steering gear,inthethesteer- simultaneously connected to them and may be
inggear compartment and, ifpower operated, required tooperate simultaneously.
it shall be also operable from the navigating
14.4 Thecircuits, required by 14.3,shallbeseparated
bridge and shallbe independent ofthecontrol
throughout their length aswidely asispracticable.
system forthe main steering gear.
15 ELECTRIC CONTROL CIRCUITS
13.2 Any main and auxiliary steering gear control
system operable from the navigating bridge shall 15.1 Electric control systems shall be independent
comply with thefollowing: and separated as far as practicable throughout their
a) Means shall be provided in the steering gear length.
compartment for disconnecting any control
15.2 Each main and auxiliary electric control system
system operable from the navigating bridge which is operable from the navigating bridge shall
from thesteering gear itserves; and
comply withthefollowing:
b) The system shall becapable of being brought
a) It shall be served with electric power by a
into operation from aposition on thenavigat-
separate circuit supplied from the associated
ingbridge.
steeringgearpowercircuit fromapoint within
13.3 The angular position oftherudder shall: the steering gear compartment, or directly
from the same section of the switchboard
a) be indicated on the navigating bridge if the
busbars, main or emergency, to which the
main steering gear is power operated. The
associated steering gear power circuit is
rudderangleindication shallbeindependentof
connected; and
thesteering gearcontrol system; and
b) Each separate circuit shall be provided with
b) be recognizable inthe steering gear compart-
shortcircuit protection only.
ment.
16 MONITORING AND ALARMS
13.4 Appropriate operating instructions with ablock
16.1 All alarms associated with steering gear faults
diagram showing the change-over procedures for
shallbeindicatedonthenavigating bridge.Thealarms
steering gear control systems and steering gear
shall be both audible and visual. Mandatory list of
actuating systems shall be permanently displayed in
steering alarms isgiven below:
thewheelhouse andinthesteering gearcompartment.
Steering Alarms, Display andIndication
SECTION 5 ELECTRIC POWER CIRCUITS,
ELECTRIC CONTROL CIRCUITS,
MONITORING AND ALARMS Equipment/ Display Alarm Remark
Charact-
14 ELECTRIC POWER CIRCUITS eristic

14.1 Short circuit protection, an overload alarm and Steering Running Overload Bridge+

inthecase of polyphase circuits, a n alarm toindicate gearmotor mdstop main
units ,ndication control
single phasing shall be provided for each main and
station
auxiliary motor circuit. Protective devices shall
operate at not less than twice the full load current of Control — Failure —
the motor or circuit protected and shall allow excess system
power
current to passduring the normal accelerating period
ofthemotors. Steering — Low Eachtank
gear tobe
14.2 Indicators for running indication of each main hydraulic monitored
andauxiliary motorshallbeinstalledonthenavigating oiltank
bridge and at a suitable main machinery control
Autopilot Running Failure
position. indication indication
14.3 Each electric or electro-hydraulic steering gear Hydraulic — Fault Where
comprising oneormorepowerunitsshallbeservedby lock morethan
at least two exclusive circuits fed directly from the onesystem
canoperate
mainswitchboard; however oneofthecircuits maybe
simulta-
supplied through the emergency switchboard. An
neously
auxiliary electric or electro-hydraulic steering gear each
maybeconnected tooneofthecircuits supplying the system is
main steering gear. The circuits supplying anelectric tobe
orelectro-hydraulic steering gearshallhaveadequate monitored
rating for supplying all motors which can be

4