Socket and Spigot Pipes

PIPE LENGTH TOLERANCES

The standard manufacturing length of a spigot and socket push-in joint pipe is 6.0m.

Manufacturing tolerance on the length of pipe is -30/+70mm.

Shorter pipe (up to -150mm) for test bar purpose, shall not exceed 10% of the total number of each diameter of socket spigot pipes supplied (MS1919).

DN	Thickness		Maximum Crack Width and Radial Displacement
	Nominal Value	Limit Deviation	Maximum Crack Width and Radial Displacement
	mm
80 to 300	4.0	-1.5	0.4
350 to 600	5.0	-2.0	0.5
700 to 1200	6/0	-2.5	0.6

Storage of pipes in hot, dry environments can cause metal expansion and mortar shrinkage which can result in the dry lining developing areas of disbondment and shrinkage cracks exceeding the widths listed above, When the lining is re-exposed to water, it will swell by absorption of moisture and the cracks will close up to conform to the figures given in the table, and will eventually heal by an autogenous process.

DIMENSIONS OF PUSH-IN JOINT DUCTILE IRON PIPES

DN	External Diameter, DE (mm)			Minimum Wall Thickness, T (mm)							Socketed Depth, t1 (mm)	Laying Length, L (mm)
DN	Nominal	Limit Deviations		Class 20	Class 25	Class 30	Class 40	Class 50	Class 64	Class 100	Socketed Depth, t1 (mm)	Laying Length, L (mm)
80	98	+1	-2.7	-	-	-	3.0	3.5	4.0	4.7	85	6000
100	118	+1	-2.8	-	-	-	3.0	3.5	4.0	4.7	88	6000
150	170	+1	-2.9	-	-	-	3.0	3.5	4.0	5.9	94	6000
200	222	+1	-3.0	-	-	-	3.1	3.9	5.0	7.7	100	6000
250	274	+1	-3.1	-	-	-	3.9	4.8	6.1	9.5	105	6000
300	326	+1	-3.3	-	-	-	4.6	5.7	7.3	11.2	110	6000
350	378	+1	-3.4	-	-	4.7	5.3	6.6	8.5	13.0	110	6000
400	429	+1	-3.5	-	-	4.8	6.0	7.5	9.6	14.8	110	6000
450	480	+1	-3.6	-	-	5.1	6.8	8.4	10.7	16.6	120	6000
500	532	+1	-3.8	-	-	5.6	7.5	9.3	11.9	18.3	120	6000
600	645	+1	-4.0	-	-	6.7	8.9	11.1	14.2	21.9	120	6000
700	738	+1	-4.3	-	6.8	7.8	10.4	13.0	16.5	-	150	6000
800	842	+1	-4.5	-	7.5	8.9	11.9	14.8	18.8	-	160	6000
900	945	+1	-4.8	-	8.4	10.0	13.3	16.6	-	-	175	6000
1000	1048	+1	-5.0	-	9.3	11.1	14.8	18.4	-	-	185	6000
1200	1255	+1	-5.8	8.9	11.1	13.3	17.7	22.0	-	-	215	6000

Note 1 : Bold figures indicate the standard products which are suitable for most applications, "-" represent products which are outside the scope of the standard. Note 2 : For smaller DN, the minimum pipe wall thickness is governed by a combination of manufacturing constraints, structural performance and installation and handling requirements. Note 3 : The minimum thickness is given for non-restained joints. Note 4 : Pressure classes between 50 and 100 may be supplied by interpolation on request.

COATING

All EDIP ductile iron pipes are coated externally with metallic zinc and finished with a bitumen paint layer, unless otherwise specified by the purchaser.

External Coating Options:
a) Bitumen and Metallic Zinc
b) Polyurethane
c) Epoxy

Internal Lining Options:
a) Cement Mortar
b) Polyurethane
c) Epoxy

The Advantages Of Using Ductile Iron Pipes

VALUE

Ductile iron pipes have an expected service life of 100+ years, this provides cost savings over service lifetime due to less frequent need for replacement.
⁠Lower energy usage for pumping due to increased flow capacity, contributing to significant energy savings throughout the service lifetime.
⁠Significantly lower non-revenue water (NRW) losses.

DURABILITY

Ductile iron pipes have greater strength and are suited for high pressure applications.
⁠Ductile iron pipes are able to withstand extreme weather conditions and high rate of soil movement.
⁠Ductile iron pipes are designed for durability, and provides better resistance against corrosion, requiring less maintenance.

SAFETY AND ADAPTABILITY

⁠Ductile iron pipes are suitable for underground applications.
The push-in joint design makes the installation process easier and faster.
Angular deflection reduces the number of bends required.
The installation process of ductile iron pipes is easier and safer, ductile iron pipes can be cut and tapped by workers on site, its thicker pipe wall is safer for tapping and does not require safety harnesses.

ENVIRONMENTAL BENEFITS

Ductile iron pipes are produced from recycled materials, the pipes are also recyclable.
Lower energy usage for pumping due to increased flow capacity and the long service life of ductile iron pipes results in less greenhouse gas emissions throughout the operation and manufacturing of the pipes.
Ductile iron pipes do not release toxic chemicals.
Lower water losses help alleviate fresh water shortages.

PHYSICAL PROPERTIES

DN	Minimum Tensile Strength	Minimum Elongation After Fracture	Maximum Hardness
DN	N/mm2	%	HB
80 to 1000	420	10	230
1200	420	7	230

LEAK TIGHTNESS

Pressure Class	Bar
Class 20	20
Class 25	25
Class 30	30
Class 40	40
Class 50	50
Class 64	50
Class 100	50

Pipes are tested prior to application of external and internal coatings, with the exception of metallic zinc coating which may be applied before testing.

ANGULAR DEFLECTION OF JOINT