Page 148 - Quick Guide to Welding and Weld Inspection by S.E. Hughes, Clifford Matthews

A Quick Guide to Welding and Weld Inspection

Table 9.1 Workplace exposure limits (WELs)
Fume or gas Long term exposure Short term exposure
limit (LTEL) (8 hour limit (STEL) (15
reference period) minute reference
period)
Aluminium 4 mg/m 3 Nil
(respirable dust)
Cadmium oxide 0.025 mg/m 3 0.05 mg/m 3
fume
Iron oxide fume 5 mg/m 3 10 mg/m 3
(as Fe)
3
Ozone Nil 0.4 mg/m /0.2 ppm
3
3
Phosgene 0.08 mg/m / 0.25 mg/m /
0.02 ppm 0.06 ppm
Argon No WEL value
Air O 2 content
to be controlled
Lifting equipment/pressure system requirements
Many items of site welding equipment will require lifting
equipment to place them into position for the site welding to
take place. The correct lifting equipment and practices will
therefore be required for all slinging and lifting operations.
Lifting equipment is normally subject to regular inspection in
accordance with a country’s published regulations. In the
UK the regulations governing lifting equipment and lifting
operations is the Lifting Operations and Lifting Equipment
Regulations (LOLER), which lays down mandatory inspec-
tion periods for lifting equipment and accessories ranging
from strops and shackles to cranes.
Fixed gas systems in Great Britain are subject to the
requirements of the Pressure System Safety Regulations
(PSSR: 2000), which deal with the in-service inspection of
pressure systems containing a relevant fluid. Gases above 0.5
barg are included in the relevant fluid classifications. Another
set of UK regulations that welding equipment will be subject
to is the Provision and Use of Working Equipment Regulations

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