TECHNICAL SPECIFICATIONS FOR COPPER SLAG BLASTING AND PAINTING OF PIPELINES
Vendor’s seal and sign
SPECIFICATIONS FOR COPPER SLAG BLASTING : 1.
The surface shall be cleaned of all dust and heavier layers of rust by copper slag blasting the entire internal surface to photographic standard SIS: 0559001967.
2.
The consumption rate of copper slag is 1.6 Kg/Sqm of the blasted area. This has to be ensured strictly.
3.
All tools, equipments, base material, hand and power tools for cleaning, including scaffolding material, copper slag blasting equipment, air compressor etc. shall be arranged by the contractor at site in sufficient quantity.
4.
The compressor used shall be of size enough to produce displacement of 5.6 to 7.0 Cum/Min of air at a pressure of 7 Kg/sqcm. Standard blasting equipment, hoppers, hoses nozzles and attachments shall be used to obtain best test results and to maintain safety standards. The rate of cleaning shall be about 15 sq.mt. per hour at a pressure of 7 kg/sq.cm.
5.
The abrasive used shall be of the physical properties as mentioned below and shall be free from oil, loan and mud etc.
6.
The blast cleaned surface shall be blasted with dry compressed air before applying primer. This should be done even if the surface appears very clean and white in colour. The white colour may be due to deposition of silicon and reflection of light on the surface.
7.
Proper earthing and bonding arrangements shall be made to prevent any damage by sparks produced by static electricity. Bonding shall be done between tank and blast nozzles and hopper and air compressor also. The bonding conductor should not be less than 16 SWG single strand copper cable.
8.
The time gap between blast cleaning and application of primer shall not be more than THREE hours. Blast cleaning work shall, commence from top to bottom.
9.
The blast cleaning operation shall be carried out keeping the nozzle at an angle of 30 degree to the vertical in order to prevent rebounding abrasive from showing down the abrasives emerging from nozzle and from under cutting the material to be removed.
Vendor’s seal and sign
10.
A blast cleaning, the percentage of bare metal obtained shall be between 95% to 100% of each of sq.cm.of the blasted area corresponding to photographic visual standards of SA 2 ½ of the Swedish standard referred above. (Pictora) surface preparation standards for painting steel surfaces).
11.
Arrangements for inspection of various stages of the job shall be made available by the Contractor so that the entire sand blasted area is available for inspection. Any defective work noticed shall be immediately rectified and even reblasting shall be done if necessary.
Physical Properties of Copper Slag :
!" %"
#$ # &' () & *
Sieve Analysis of copper slag : +,- .#+# .$#/ +$#/ . & +& . - +- . -$&$ +-$&$ 01
$ , # &$ ,- & #/ &$ -$ &-
Vendor’s seal and sign
SPECIFICATION FOR PAINTING OF PIPELINES Primer : Zinc anode 304 primer. Black or any other colour enamel paint shall conform to IS:2933 - 1964 or equivalent. The final coat shall be Bergerthane enamel of Berger or equivalent as approved by HPCL. Only superior grade paints of approved make quality and conforming to above specifications shall be used. Surface Preparation : Before painting, the surface shall be cleaned thoroughly leaving it free of all scales, rust, grease, oil coating, moisture and other matter. Heavy deposits of grease and oily material if any shall be removed by a suitable solvent wash before painting. The following colours shall be painted for different pipelines and the fittings : a)
All above ground decanting product pipelines, flanges on product pipelines shall be painted with Bergerthane enamel of relevant shades as described depending upon the product the pipeline used for it. Name of the product along with the arrow mark as shown below shall be written in black at specified places like bends, change of direction and other places as directed by the EIC.
b)
Colour code bands : The colour code bands shall be provided as shown below (conforming to IS 5-1978) :
Vendor’s seal and sign
Pipelines shall be colour coded to indicate the product that is being carried.
Colour coding for all products, shall have one band of 100 mm (4”) on each side with a gap of 300 mm (12”) in between. Aluminium paint shall be applied on white oil lines and black oil lines shall be painted black. The product carried shall be written in a gap of 300 mm in white letters for black oils and black letters for white oils in the flow direction. The size of letters shall be half the diameter of the pipeline (colour coding chart is enclosed as shown under). A 45-50 mm thick x 300 mm long arrow (as shown above) shall be painted after each band on the pipeline with respective colour code in the flow direction. 2.4.2 The recommended colour coding for bands shall be : PRODUCT
COLOUR
ISC NO.
MS 93 OCTANE
Signal red
537
MS 88/91 Octane
Dark Orange
591
SKO
Golden Yellow
356
HSD, LSHF-HSD,HF-HSD, ELSHSD
Oxford Blue
105
LDO
Aluminium
----
FO
Aluminium
Naptha (LAN & HAN)
Dark Brown
412
Ethanol
LILAC
-----
A 45-50 mm thick x 300 mm long arrow (Clause 4.3.3) shall be painted after each band on the pipeline with respective colour code in the flow direction
Vendor’s seal and sign
