ENGINEERING DRAWINGS
The engineering drawings are available in different scales and sizes as
per requirements and type of work.
Below shown the
overview of engineering drawing layout
for reference,
The Drawing sheet may vertical or horizontal. The different
sizes of sheets available in market as shown in below,
A0 SIZE
: 841 x 1189
A1 SIZE
: 594 x 841
A2 SIZE
: 420 x 594
A3 SIZE
: 297 x 420
A4 SIZE
: 210 x 297
A5 SIZE
: 148 x 210.
The each Engineering
drawing consisting scale at corner of drawing (In title block) as,
For Full Scale
= 1:1
Reduced Scale =
1:2.5, 1:5, 1:10, 1:20, 1:50, 1:100 & 1:200.
Enlarged Scale = 10:1, 5:1 & 2:1.
The typical
title block on engineering drawing shown below,
Pic02
The title block
is important part of engineering drawing lots of information placed in title
block.
The title block contain
Name of organisation (Manufacturing firm), Drawing status (Approved or not ), Drawing
no. (Item no and name), Scale of drawing, Tolerances, PO Number of that particular
order , Date on which the respective drawing built, Plant of that order, Checked
by (person name) etc. In other word the main important parameter of manufacturer
(Name of Organisation) Client details etc incorporated in Title block.
Out of title block the
engineering drawing contain BOM (Bill of Material), drawings required all notes
all necessary data for example weld joint configuration, Size of hole etc consist
in engineering drawing.
If we take example of ordinary pressure vessel drawing the drawing
consisting following information,
1)
Type of heat treatment is required or not if yes
then Heat Treatment cycle & all data,
2)
Working Pressure.
3)
Design Pressure on which the vessel is design.
4)
Design Temperature.
5)
MDMT (Mean design Metal Temperature).
6)
Joint Efficiency.
7) RT Requirements.
8)
Type of Head.
9)
PWHT (Post Weld Heat Treatment) or PFHT (Post
Forming Heat Treatment).
10) Operating Medium.
11) Capacity.
12) Standards
(Tolerance sheet).
13) All elements dimensions and material.
14) Wind
Specification.
15) Insulation Details.
16) Inspected
by (Depends).
17) Weight
of Vessel (Erection & Operating).
18) Hydro-Static test pressure and in horizontal or vertical position depend on item.
19) Painting Specification and details.
Note that above
parameters not mandatory above parameters may vary as per Client to client and vendor to vendor which depends on job/item.
All necessary important information
required for fabrication is incorporated in Engineering Drawing.
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