S-1 — المواصفات العامة للتركيبات الكهربائية
M الطلاء والتشطيب
الصفحة 80 في الوثيقة الأصلية
عرض PDFM.
M.1
M.1.1
M.1.2
M.1.3
M.1.4
M.l.5
M.1.6
M.2
M.2.1
M.2.1
M.2.2
M.2.3
80
PAINTING AND FINISHING
GENERAL
All painting and finishing shall be conducted generally in accordance with the following specifications:
BS EN ISO 1461 Hot Dip Galvanized Coatings on Iron and Steel Articles.
BS EN ISO 8501 Preparation of steel substrates before application of paints and related products.
BS EN ISO 14713 Zinc coatings. Guidelines and recommendations for the protection against corrosion
of iron and steel in structures
All metal surfaces, whether painted or otherwise, shall be suitably protected against rust or corrosion.
Metal work which is normally painted may have to be patched up or repainted after erection as necessary.
Where the installation is to be painted, all oil, dust and other foreign matter shall be removed from
equipment and its accessories.
All metal surfaces shall be properly cleaned, prepared and primed before finish painting.
Unless other wise specified all exterior and interior painted surfaces of switchboards, distribution
boards, motor control centres, isolators, trunking, busbar trunking, etc. shall be finished light grey gloss
finished, or other approved colour.
All fluorescent luminaires shall be finished gloss white. The ceiling plates modular flush luminaires shall
be finished semi-gloss white.
GALVANIZING:
The surface preparation shall be as follows:
a) Before galvanizing, surfaces shall be degreased and pickled. The pickling process shall be such as to
ensure the removal of all mill scale and other surface defects. There after it shall be neutralized prior
to galvanizing.
b) Before zinc spray coating, surfaces shall be shot blasted.
Galvanizing shall be applied by the hot process to give an average coatin g minimum permissible value of
610 g/m2 above 5mm. steel thick and 460 g/m2 between 2 and 5mm. steel thickness for all fabricated
steel articles.
Galvanized surfaces shall have an etching primer applied before painting.
Oversize tapping or retapping of female threads shall be provided where the bolt or male thread is hot dip
galvanized. Nuts shall be tapped to 0.4 mm oversize after galvanizing and the threads shall be oiled.
Bolts and screwed rods shall be galvanized after thread forming.
The threads of all bolts and screwed rods shall be cleared of spelter by spinning or brushing. A die shall not
be used for cleaning the threads unless approved by the Engineer.
M.3
M.3.1
M.3.2
M.3.3
M.3.4
M.3.5
M.3.6
M.3.7
M.3.8
M.3.9
PAINTING OF GALVANIZED MATERIAL:
Before painting all galvanized parts shall be completely clean and free from rust, scale or grease and all
external rough surfaces shall be filled.
Except for nuts, bolts and washers which may have to be removed for maintenance purposes, all
external surfaces shall receive a minimum of three coats of paint.
The priming coat shall be applied immediately after cleaning, no further painting shall be done until
the works tests have been carried out.
After inspection and test and before dispatch to site, all external surfaces shall be thoroughly cleaned,
touched up as necessary and a second coat applied of a shade of colour easily distinguishable from the
priming and final coat.
All surfaces shall be cleaned down, touched up as necessary and a final coat applied of a glossy and
non-fading light grey colour paint.
Damage to paint work incurred during transport or erection shall be made good by thoroughly
cleaning and applying the full number of coats originally specified.
Exposed un galvanized nuts, bolts and washers which may have to be removed for maintenance purposes
shall have a minimum of one coat of paint after erection.
If the final coat is not applied at the works, the period between the application of the second and the
final coats shall not exceed three months unless otherwise directed by the Engineer.
The internal surfaces of cubicles and boxes containing wiring or other apparatus which are dispatched
to site in an assembled condition shall be finish painted before inspection and testing.
81
M.1
M.1.1
M.1.2
M.1.3
M.1.4
M.l.5
M.1.6
M.2
M.2.1
M.2.1
M.2.2
M.2.3
80
PAINTING AND FINISHING
GENERAL
All painting and finishing shall be conducted generally in accordance with the following specifications:
BS EN ISO 1461 Hot Dip Galvanized Coatings on Iron and Steel Articles.
BS EN ISO 8501 Preparation of steel substrates before application of paints and related products.
BS EN ISO 14713 Zinc coatings. Guidelines and recommendations for the protection against corrosion
of iron and steel in structures
All metal surfaces, whether painted or otherwise, shall be suitably protected against rust or corrosion.
Metal work which is normally painted may have to be patched up or repainted after erection as necessary.
Where the installation is to be painted, all oil, dust and other foreign matter shall be removed from
equipment and its accessories.
All metal surfaces shall be properly cleaned, prepared and primed before finish painting.
Unless other wise specified all exterior and interior painted surfaces of switchboards, distribution
boards, motor control centres, isolators, trunking, busbar trunking, etc. shall be finished light grey gloss
finished, or other approved colour.
All fluorescent luminaires shall be finished gloss white. The ceiling plates modular flush luminaires shall
be finished semi-gloss white.
GALVANIZING:
The surface preparation shall be as follows:
a) Before galvanizing, surfaces shall be degreased and pickled. The pickling process shall be such as to
ensure the removal of all mill scale and other surface defects. There after it shall be neutralized prior
to galvanizing.
b) Before zinc spray coating, surfaces shall be shot blasted.
Galvanizing shall be applied by the hot process to give an average coatin g minimum permissible value of
610 g/m2 above 5mm. steel thick and 460 g/m2 between 2 and 5mm. steel thickness for all fabricated
steel articles.
Galvanized surfaces shall have an etching primer applied before painting.
Oversize tapping or retapping of female threads shall be provided where the bolt or male thread is hot dip
galvanized. Nuts shall be tapped to 0.4 mm oversize after galvanizing and the threads shall be oiled.
Bolts and screwed rods shall be galvanized after thread forming.
The threads of all bolts and screwed rods shall be cleared of spelter by spinning or brushing. A die shall not
be used for cleaning the threads unless approved by the Engineer.
M.3
M.3.1
M.3.2
M.3.3
M.3.4
M.3.5
M.3.6
M.3.7
M.3.8
M.3.9
PAINTING OF GALVANIZED MATERIAL:
Before painting all galvanized parts shall be completely clean and free from rust, scale or grease and all
external rough surfaces shall be filled.
Except for nuts, bolts and washers which may have to be removed for maintenance purposes, all
external surfaces shall receive a minimum of three coats of paint.
The priming coat shall be applied immediately after cleaning, no further painting shall be done until
the works tests have been carried out.
After inspection and test and before dispatch to site, all external surfaces shall be thoroughly cleaned,
touched up as necessary and a second coat applied of a shade of colour easily distinguishable from the
priming and final coat.
All surfaces shall be cleaned down, touched up as necessary and a final coat applied of a glossy and
non-fading light grey colour paint.
Damage to paint work incurred during transport or erection shall be made good by thoroughly
cleaning and applying the full number of coats originally specified.
Exposed un galvanized nuts, bolts and washers which may have to be removed for maintenance purposes
shall have a minimum of one coat of paint after erection.
If the final coat is not applied at the works, the period between the application of the second and the
final coats shall not exceed three months unless otherwise directed by the Engineer.
The internal surfaces of cubicles and boxes containing wiring or other apparatus which are dispatched
to site in an assembled condition shall be finish painted before inspection and testing.
81