Section
4 Machinery room arrangements
4.1 Accessibility
4.1.1 Accessibility,
for attendance and maintenance purposes, is to be provided for machinery
plants.
4.2 Machinery fastenings
4.2.1 Bedplates,
thrust seatings and other fastenings are to be of robust construction,
and the machinery is to be securely fixed to the ship's structure
to the satisfaction of the Surveyor.
4.3 Resilient mountings
4.3.1 The dynamic angles of inclination in Table 1.3.2 Inclination of ship may be exceeded in certain circumstances
dependent upon ship type and operation. The Shipbuilder is, therefore, to ensure that
the vibration levels of flexible pipe connections, shaft couplings and mounts remain
within the limits specified by the component manufacturer for the following conditions:
- Maximum dynamic inclinations to be expected during service;
- Start-stop operation; and
- The natural frequencies of the system.
Due account is to be taken of any creep that may be inherent in the mount.
4.3.2 For equipment of installed power greater than 375 kW, see
Pt 6, Ch 2, 1.6 Definitions 1.6.10 (b), a calculation report is to be submitted
to demonstrate that the requirements of Pt 5, Ch 1, 4.3 Resilient mountings 4.3.1 are met. The calculation report is to include as a
minimum:
- A plan showing the arrangement of the machinery including mounts, exhaust
bellows, and flexible couplings and pipe connections, as applicable; and
- Maximum allowable loads and deflections and any appropriate type approval
documentation for each flexible element (resilient mounts, exhaust gas bellows,
flexible couplings and any other applicable flexible pipe connections) for the
conditions identified in Pt 5, Ch 1, 4.3 Resilient mountings 4.3.1; and
- Calculations including natural frequencies and maximum expected
loads and deflections of each flexible element (resilient mounts, exhaust gas
bellows, flexible couplings and any other applicable flexible pipe connections)
for the conditions identified in Pt 5, Ch 1, 4.3 Resilient mountings 4.3.1.
4.3.3 Chocks are to be fitted, together with positive means to ensure that
manufacturers' limits for lateral or vertical motion are not exceeded. Where resilient
mounts are approved for collision loading, then the extent of any additional chocking
that may be required will be specially considered. Suitable means are to be provided to
accommodate the propeller thrust.
4.3.4 Mounts are to be shielded from the possible detrimental effects of oil and, where
appropriate, paint and other contaminants.
4.3.5 Shafting, piping connections and electrical cable connections are to be provided with
sufficient flexibility to accommodate expected movements. Particular attention should be
paid to exhaust bellows and the effectiveness of flexible couplings.
4.4 Resin chocks
4.4.1 Synthetic resin compounds used as materials for chocks under machinery components for
which alignment is critical, e.g. main engine, gearbox and auxiliary installations
where the engine and generator do not share a common baseplate, are to be of a type
approved by LR.
4.4.3 Materials for chocks are to be approved for the maximum service temperature that the
chock will experience.
4.4.4 The use of resin for chocking gas turbine casings or similar high temperature
applications will be specially considered.
4.5 Ventilation
4.5.1 All
spaces including engine and cargo pump spaces, where flammable or
toxic gases or vapours may accumulate, are to be provided with adequate
ventilation under all conditions.
4.5.2 Machinery
spaces of category A shall be adequately ventilated so as to ensure
that when machinery or boilers therein are operating at full power
in all weather conditions, including heavy weather, a sufficient supply
of air is maintained to the spaces for the safety and comfort of personnel
and the operation of the machinery. Any other machinery space shall
be adequately ventilated, as appropriate for the purpose of that machinery
space.
4.6 Fire protection
4.6.1 All
surfaces of machinery where the surface temperature may exceed 220°C
and where impingement of flammable liquids may occur are to be effectively
shielded to prevent ignition. Where insulation covering these surfaces
is oil-absorbing or may permit penetration of oil, the insulation
is to be encased in steel or equivalent.
4.7 Means of escape
4.8 Communications
4.8.2 One
of these means is to visually indicate the order and response, both
at the engine room control station and on the bridge.
4.8.3 At least
one means of communication is to be provided between the bridge and
any other control position(s) from which the propulsion machinery
may be controlled.
4.9 Category A machinery spaces
4.9.1 ‘Machinery
spaces of Category A’ are those spaces and trunks to such spaces
which contain:
-
internal combustion machinery used for main
propulsion; or
-
internal combustion machinery used for purposes
other than main propulsion where such machinery has in the aggregate
a total power output of not less than 375 kW; or
-
any oil-fired boiler or fuel oil unit.
|
Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime
and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective
officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications
Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance
on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant
Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is
exclusively on the terms and conditions set out in that contract.
|
![](LR-FooterLogo.png) |
|