1. Main points of installation of NI-Type and S-Type joint
1.1 Clean the oil, sand and roots at a distance of 40cm to the socket and spigot.
1.2 Put the cleaning gland into the spigot.
1.3 Clean the external and internal of spigot end and socket by the soap solvent.
1.4 Clean the rubber gasket and separation ring by the soap solvent, and then put it into spigot.
1.5 Squeeze rubber gasket and make it be in the right position(a sharp chipper shall not be used)
1.6 Put the bolt, and tightened nut by spanner.
1.7 Check all of the bolts’ moment if it is fitting of the standard in order.
1.8 If it can not installed tightening, then clean and install the bolts again
1.9 The permitted angle of deflection is : DN80-350mm 3° -5° DN400-600mm 2° -3° DN700mm 1° -2°
2. Matters Needing Attention:
2.1 When piling pipes, wood block shall be put under the lowest layer of pipes. Hard material like bricks are not allowed to use. Height of layers of pipes shall not exceed 2.4m.
2.2 Before dumping, check the socket, spigot, pipe body and gland. If there is oval, replace the pipe.
2.3 Spigot of pipes shall be prevented from shocking to avoid oval which could cause trouble in installation.
2.4 The pipes should be checked whether the quality is eliqibility before installation. Pipes shall be installed from lower place to higher place, and socket shall be in direction to higher place.
2.5 When digging trench, the place where two pipes will be jointed shall be given sufficient space for convenience of joining. Except in special case, the side of trench(except the space for joint) shall be level as much as possible. When digging by machinery, man power shall be applied to clear the bottom of trench.(Note:the deepness of the trench is not less than 0.8m)
2.6 After cutting pipes, spigot shall be bevelled to angle of 30, from pipe axis with file or sand wheel.
2.7 When construct in trench, install the deeper pipe firstly.
2.8 When install the pipes, check and adapt the height of pipe joint.
2.9 Drainage equipment shall be needed to prevent from rain or leakage of underground water during digging.
2.10 During the construction, all kinds of bends, tees should set fix buttress avoid displacement(the compacted concrete is C20).
2.11 There is no specific requirement for earth to be filled back, but sand or good original earth dug from trench will be better to be used as backfiller that contacts directly with pipes. Attention shall be paid to fill the earth equally along both sides of pipe barrel and fill fully at the bottom of pipes.
2.12 When construct in winter, the rubber gasket should dipped in hot water before used, and the spigot and socket should be washed by brine.
3. Installation steps of NI-Type and S-Type Bolt Joint
Cleaning (SEE Fig.No 1)
the parts which need cleaning as follows:
a. at a distance of 400mm to the spigot end external
b. socket internal
c. Bolt, rubber gasket external
d. External of gland, T-T ype bolt and hexagon nut
e. the external and internal of rubber gasket, support ring, separation ring.
Make mark line at the distance L on the spigot end by marker pen(oiliness)(see table).
| DN |
80 |
100 |
150 |
200 |
250 |
300 |
350 |
400 |
500 |
600 |
700 |
800 |
900 |
1000 |
1200 |
| L |
120 |
130 |
130 |
140 |
140 |
145 |
150 |
160 |
167 |
175 |
182 |
190 |
190 |
200 |
215 |
Check the distance between the gland and socket flange is whether or not same, if the clearance is widely, tigthen the bolt again. If pipe installation is found no good, it should be done to unistall the pipe and reinstall the pipe.
