Specification of Ductile Iron Pipes

LANCO manufactures Ductile Iron and Cast Iron Pipes at its Spun Pipe Division meeting international standards. Due to the superior manufacturing techniques and state ?of the ?art facilities operated by highly skilled manpower, the products not only meet the standard requirements but also surpass those specifications. The Ductile Iron Pipes are produced in K7,K9  classes at the works. The product range covers wide spectrum fro 100-1000 mm diameter. The product range includes socket and spigot pipes, flanged pipes of screwed on flange and welded on flange types.

Socket & Spigot Pipes

The pipes are classified as K7 and K9  depending upon service condition and manufacturing process. The class designation shall comprise of :

a)     a prefix K

b)    a whole number used for thickness class designation ( this is the selected coefficient depending on the service conditions)

The nominal wall thickness of pipe e?in mm shall be calculated as  a function of the nominal diameter by the following equation with minimum of 5 mm for K=7, 6mm for K=8 and 7mm for K=12.

e=k(0.5+0.001DN)

where e= wall thickness in mm

          DN =the nominal diameter

K= the whole number coefficient

The whole number used for thickness class designation with K(i.e. K7,K9 etc.) depends on service conditions like water supply, sewerage conveyance, gas supply etc.

Standard Length for Pipes :

Size (DN) Standard Length
100 & 150  5.0 Mtr & 5.5 Mtr
200 to 600 5.5 Mtr & 6.0 Mtr
700 to 1000 5.5 Mtr & 6.0 Mtr

Tolerance on standard length for socket and spigot pipes is -30 / +70 as per BSEN 545:2002.

Tolerance on length of socket & spigot pipes is  ?00 as per IS 8329 : 2000

 

Double Flanged Pipes

LIL  manufactures double flanged pipes with flanges either screwed or welded  on ductile Iron barrel pipes of  K9  class. The flanges for screwed on or welded on double flanged pipes should be of ductile iron of 420 MPa  minimum tensile strength and 5% minimum elongation and maximum hardness of 250 HB.

The flanges are rated as PN10, PN16, PN25 and PN40 which correspond to the pressure rating values.

Nominal pressure (PN) is a numerical designation expressed buy a number which is used for reference purposes. All components of the same nominal size DN designated by same PN number have compatible mating dimensions. For screwed or welded on flange pipes, the minimum classes as per working pressure criteria are given below :

Minimum Class for Ductile Iron flanged pipes

Nominal Dia

Screwed on Flange Minimum

Welded on Flange Minimum

 

PN10

PN16

PN25

PN40

PN10

PN16

PN25

PN40

100 ?50

K9

K9

K9

K9

K9

K9

K9

K9

500-600

K10

K10

K10

K10

K9

K9

K9

K10

700-1000

K10

K10

K10

-

K9

K9

K9

-

 

 

 

 

Pipe Lengths

The flanged pipes are supplied as given in the table

Type of Pipe

DN

Standard Length

With screwed ?on or welded ?on flanges

100-1000

4 or 5 or 5.5

 

Internal & External Protection for Pipes & Fittings

All pipes and fittings are delivered internally & externally coated. A wide range of coating are offered to customers for their selection.  

External Protection

Pipes

?span style="font:7.0pt "Times New Roman"">       Bitumen Coating

?span style="font:7.0pt "Times New Roman"">       Metalic zinc with finishing layer in accordance with ISO ?179?

?span style="font:7.0pt "Times New Roman"">       Zinc rich paint finishing layer in accordance with ISO ? 8179 ?2

?span style="font:7.0pt "Times New Roman"">       Thicker metallic zinc with finishing layer

Additional protection can be provided with

?span style="font:7.0pt "Times New Roman"">       Epoxy

?span style="font:7.0pt "Times New Roman"">       Polyethylene sleeving

?span style="font:7.0pt "Times New Roman"">       Adhesive  tapes

Pipe fittings

?span style="font:7.0pt "Times New Roman"">       Bitumen Coating

?span style="font:7.0pt "Times New Roman"">       Epoxy Coating

?span style="font:7.0pt "Times New Roman"">       Zinc with finishing layer

Additional protection can be provided with :

?span style="font:7.0pt "Times New Roman"">       Adhesive tapes

Internal protection for Pipes and Fittings

Cement

?span style="font:7.0pt "Times New Roman"">       Sulphate  resistant cement (including blast furnace slag cement)

?span style="font:7.0pt "Times New Roman"">       High alumina ( calcium aluminate ) cement mortar

?span style="font:7.0pt "Times New Roman"">       Portland cement mortar

Additional seal coat can be provided as an additional protection

Epoxy

Bituminous paint