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Pipe Installation

Ditch Digging

Ditch Diagram

Standard trench width for ductile iron pipes

Nominal size DN （mm）	Standard trench width W（mm）	Nominal size DN （mm）	Standard trench width W（mm）
80	680	700	1300
100	700	800	1400
150	750	900	1500
200	800	1000	1600
250	850	1100	1700
300	900	1200	1800
350	950	1400	2000
400	1000	1500	2100
450	1050	1600	2200
500	1100	1800	2400
600	1200	2000	2600

Pipe Laying

Installation of socket spigot push on T-type ductile iron pipe

Cleaning of socket and spigot

Thoroughly clean the socket and spigot, insert the rubber sealing ring, and check if all facing directions are suitable and correctly fixed.

Installing rubber sealing ring

Insert rubber sealing ring (small diameter pipe)
Insert the rubber sealing ring into the socket, making it in the shape of a heart or 8, and then insert the lower half or top and bottom of the rubber sealing ring into the grooves in the socket.
Insert rubber sealing ring (large diameter pipe)
Align the white marking line on the rubber sealing ring with the marking line on the end surface of the socket, and then insert the rubber sealing ring into the socket in a flower-like shape as shown in the following figure. (ensure that the circumference of the rubber sealing ring faces the appropriate sealing groove.)

After removing dust and impurities, apply a layer of lubricant to the area from the end of the socket to the inside of the white line and the inner surface of the rubber sealing ring.
Ensure that the spigot has been chamfered, otherwise, square or sharp edges may cause damage or displacement of the sealing ring and cause leakage. When cutting pipes at the construction site, a heavy file or grinder should be used to chamfer the socket and remove sharp edges.
Align the spigot with the socket, and then insert it into the socket of the pipe.

Use of connecting tools
Pipes with a diameter of DN700-1200 use two control rod sliders when connecting, while pipes with a diameter of DN1400-2000 use three control rod sliders

Use of connecting tools
Pipes with a diameter of DN700-1200 use two control rod slPush the spigot end of the pipe into the socket
When pushing in, ensure that the joint is straight.
Small diameter pipes can be pushed in using a long rod and fork. For large - diameter pipes, it is required to add chain blocks, rotating rod pullers, etc.iders when connecting, while pipes with a diameter of DN1400-2000 use three control rod sliders

Table of Chain Block Quantity for Installation of Ductile Iron Pipe

Nominal size DN(mm)	Chain block parameters (tonnage)	Number of chain blocks(PCS)
DN1 00 200	1	1
DN300 ~400	2	1
DN500 ~ 600	5	1
DN700 ~ 800	5	1
DN900 ~ 1000	5	2
DN1200 ~ 1400	8	2~3
DN1600 ~2000	10	2~3

Deflection Angle

When deflection of the pipeline is required, the method of deflection of the pipeline at the joint can be used within the allowable angular deflection range.

Nominal size DN(mm)	Allowed Deflection Angle
80-200	5。
250-350	4。
400	30 30 '
450-600	30
700-900	20 30 '
1000-2000	2。

Check the position of the sealing ring

Insert a feeler gauge into the gap between the socket and the spigot, and check along the circumference of the socket to ensure that the position of the sealing ring is appropriate

DN	P-10	DN	P-10	DN	P-10
DN	T type joint	DN	T type joint	DN	T type joint
80	75	450	110	1400	230
100	78	500	110	1500	240
125	80	600	110	1600	250
150	85	700	140	1800	290
200	90	800	150	2000	309
250	95	900	165	2200	--
300	100	1000	175	2400	--
350	100	1100	190	2600	--
400	100	1200	205

Backfill

The soil used for backfilling ditches shall be free from slag, dust, waste, vegetables or organic materials, gravel, rocks, frozen soil, or other unsuitable materials. From 0.3 meters above the top of the pipe to the roadbed of the sidewalk, soil containing gravel can be used, with a maximum size of no more than 20cm.