船体建造精度正文(英).doc

THE STANDARDS OF SHIPBUILDING QUALITY
CONSTRUCTION ACCURACY
Q/SWS60--2001
Notes:
This standard includes the items of inspections/tests for hull construction, outfitting, machinery and electrical installation and painting.
The standard applies mainly to the conventional sea-going steel ships of 3000 tone deadweight and above drive by diesel engine. This standard also be used as a reference for ships under 3000 tone deadweight.
1 HULL CONSTRUCTON
Steel Materials
Surface defects of steel plates shall be kept within the limits as defined in
table1-1
Table 1-1
Items
Requirements
Pits,
flaking,
scars,
scratches
and air
bubbles
1) Zone A is in excellent order, with very slight
surface defects less than ,and no
repairing is needed.
2) Zone B is in good order, with a certain
amount of permissible surface defects, and
no repairing is needed. Area enclosed by full
lines denotes plate with thickness less than
20mm, and area enclosed by dotted line
(including straight line) denotes plates with
thickness from 20 to 50mm.
3) Zone C is in disorder, and repairing is
needed, . there are certain amounts of
impermissible surface defects that shall be
repaired according to the requirement.
4) Repairing method for surface defects:
for d<, by grinding (but in no case d≤3mm),
for ≤d≤, by built-up welding followed
by grinding
where d is defect depth, mm
t is plate thickness, mm
In case the defect depth exceeds 20% plate
thickness and defect area exceeds 2% plate
area, this part of plate is to be replaced as required.
The negative thickness tolerance of hull structural steel plate shall be kept not to exceed .
Lamination of steel plate is to be treated according to table1-2.
Table 1-2
Items
Requirement
Local lamination
1) In case the range of lamination is fairly
small it can be chipped out and built-up by
welding as shown in Fig(a).