ISO 3827-1:1977 pdf download – Shipbuilding – Co-Ordination of dimensions in ships’ accommodation
The advantages of dimensional and modular Co-Ordination have been internationally recongized for many years and an International Standard has been agreed for the incre- ments or modules to be used in the construction industry. The ultimate aim in publishing recommendations for dimensional Coordination is the establishment of standard- ized ranges of sizes for components, and in Order to achieve the maximum utilization of these components it is necessary to establish a comprehensive System which will form a framework for sizing, positioning and assembling co-ordinated components. In shipbuilding the main advantages in utilizing co- ordinated components occur in the accommodation areas where repetitive components are used which are common to the other industries operating dimensional Co-Ordination.
3.l Dimensional dramework
In Order to ensure that dimensionally co-ordinated com- ponents or assemblies of components fit the spaces aflocated to them a dimensional framework, or reference System, is employed which is common to both.
3.1.1 Modular grids
The dimensional framework is represented by a grid, in vvhich the grid lines are spaced in multiples of the Standard modules, or increments of size, and the grid lines indicate the boundaries for the component and the space allocated to it. The Lose of a grid on drawings is an aid in locating components and in reading the drawings; as such it is a tool for communication.
4 THE CONTROLLING REFERENCE SYSTEM
In establishing a dimensional framework, or reference System, which tan be related to both dimensionally co- ordinated components and the structure incorporating them it is essential to establish certain controls over the principal dimensions of the reference stystem. The initial control is based on the use of the Standard modules given in table 1 but, in Order to reduce the considerable number of permutations possible with these modules, f urther controls are necessary. Certain known datum lines, which are related to User requirements, tan be identified within the structure and the structure tan be divided by these datum lines into a number of spaces. Some of these spaces are termed “usable spaces”, for example cabin interiors, and others termed “zones” are the spaces surrounding the usable space and are allocated to the structure or Services. These terms are described later in this clause. The principal dimensions of these zones and spaces tan be standardized to give a limited range of sizes, which are multiples of the Standard modules, but achieve a considerable degree of variety reduction, in relation to particular components. These dimensions are therefore termed “controlling dimensions”. The identif ied datum lines which define the zones and usable spaces are termed “controlling lines” and in three-dimensional considerations the planes which these lines represent on Plans, sections and elevations are termed “key reference Planes”. The entire framework of planes, zones and dimensions is described as the “controlling reference System”.