Volume-II of IV - GAIL

. Intersection points & change of direction points in piping ways.
c. Other points, such as midway of each piping way, near valves,
junction joints of services appliances, walls, on either side of pipe
culverts.
d. For zong stretch/ xard piping at 50M interval.
e. At start and terminating points.
18.4 Identification Sign
18.4.1 Flow direction shall be indicated by an arrow in the location stated in Para
a,b,c & d and as directed by Engineer-in-charge.
18.4.2 Colours of arrows shall be black or white and in contrast to the colour on
which they are superimposed.
18.4.3 Product names shall be marked at pump inlet, outlet and battery limit in a
suitable size as approved by Engineer-in-charge.
18.4.4 Size of arrow shall be either of those given in 18.5.
18.5 Colour Bands
18.5.1 As a rule minimum width of colour band shall conform to the following
table:
Nominal Pipe Size Width : L(mm)
3” NB and below 25mm
Above 3” NB upto 6” NB 50mm
Above 8” NB upto 12” OD 75mm
Above 12” OD 100mm
Note: For insulated pipes, nominal pipe size means the outside diameter
of insulation.
Nominal pipe size figures are to be inches.
18.5.2 Colour band(s) shall be arranged in the sequence shown in Table 18.1
and the sequence follows the direction of flow. The relative proportional
width of the first colour band to the subsequent bands shall be 4:1,
minimum width of any band shall be as per Clause 18.5.1.
18.5.3 Whenever it is required by the Engineer-in-charge to indicate that a
pipeline carries a hazardous material, a hazard marking of diagonal strips
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