Answer / mohd. younus ali engineer

Thickness of RCC NP3 class is more than NP2 Class Rcc Hume
pipes

Answer / suresh

the Non Pressure RCC hume pipes of class 2 are known as light duty hume pipes used for sewers,irrigation and light traffic culverts.their thickness varies from 25 to 110 mmfor 8cm dia and 2.2m dia respectively.
for NP3 (medium duty) the thickness varies from 25 to 215mm
for 8cm dia and 2.6m dia respectively.
there is NP4 class also. all yhe remaining being same except the thickness.
IS:458-1988 deals with the requirements.

Answer / rakesh h.r.

TECHNICAL PARTICULARS OF R.C.C. HUME PIPES
This Specification covers the requirements for Non-Pressure
Reinforced Precast Concrete
Pipes (Spun) used for culverts, sewers, irrigation etc.

The Concrete Pipes shall be conforming to IS: 458/2003
(Fourth Revision) with up-to-date
amendment with regards to Design /Dimensions / Tolerances /
Workmanship & Finish /
Materials used for making the Pipes. The Pipes shall be
manufactured by spinning process.

The ends of the concrete pipes shall be suitable for flush
joints or collar joints or suitable
for Socket & Spigot, roll on joints or confined gasket
joints as per the requirements of the
purchaser.

The Pipes shall be of the following Sizes & Classification:
Schedule- 1: Reinforced Concrete, Light duty, Non-pressure
Pipes, Class: NP2, with ends of
the pipes suitable for collar joints conforming to IS:
458/2003 (Fourth Revision)
with up-to-date amendment
Nominal Diameter of Pipes in mm.
80, 100, 150. 200, 225, 250, 300, 350, 400, 450, 500, 600,
700, 800, 900, 1000,
1100, 1200, 1400, 1600 & 1800.

1. Dimensions, Design and Strength requirements of
Reinforced Concrete Pipes of Class NP2
shall be as per the Table 2 of IS: 458/2003(Fourth
Revision), with up-to-date amendment.

2. Tenderers may also quote rates separately for the
Collars. Dimensions and Design
requirements of Reinforced Concrete Collars for Pipes of
Class NP2 shall be as per the Table
21 of IS: 458/2003, with up-to-date amendment.

Schedule- 2: Reinforced Concrete, Light duty, Non-pressure
Pipes, Class: NP2, with ends of
the pipes suitable for Socket & Spigot, roll on joints or
confined gasket joints
conforming to IS:458/2003 (Fourth Revision) with up-to-date
amendment along
with Rubber Ring conforming to Type 2 of IS: 5382/1985 with
up-to-date
amendment.

Nominal Diameter of Pipes in mm.
80, 100, 150. 200, 225, 250, 300, 350, 400, 450, 500, 600,
700, 800, 900, 1000,
1100,1200, 1400, 1600 & 1800.

1. Dimensions, Design and Strength requirements of
Reinforced Concrete Pipes of Class NP2
shall be as per the Table 2 of IS: 458/2003(Fourth
Revision) with up-to-date amendment.

2. Spigot & Socket dimensions of NP2 Class Pipes shall be
as per Table 13 of
IS: 458/2003(Fourth Revision) with up-to-date amendment.

3. Rubber Ring chords used in the Pipe joints shall conform
to Type 2 of IS: 5382/1985 with
up-to-date amendment.

Schedule- 3: Reinforced Concrete, Medium duty, Non-pressure
Pipes, Class: NP3, with ends
of the pipes suitable for flush joints conforming to IS:
458/2003 (Fourth Revision)
with up-to-date amendment.

Nominal Diameter of Pipes in mm.
80, 100, 150. 200, 225, 250, 300, 350, 400, 450, 500, 600,
700, 800, 900, 1000,
1100, 1200, 1400, 1600 & 1800.

1. Dimensions, Design and Strength requirements of
Reinforced Concrete Pipes of Class NP3
shall be as per the Table 3 of IS: 458/2003(Fourth
Revision) with up-to-date amendment.

Schedule- 4: Reinforced Concrete, Medium duty, Non-pressure
Pipes, Class: NP3, with ends
of the pipes suitable for Socket & Spigot, roll on joints
or confined gasket joints
conforming to IS:458/2003 (Fourth Revision) with up-to-date
amendment along
with Rubber Ring conforming to Type 2 of IS: 5382/1985 with
up-to-date
amendment.

Nominal Diameter of Pipes in mm.
80, 100, 150. 200, 225, 250, 300, 350, 400, 450, 500, 600,
700, 800, 900, 1000,
1100, 1200, 1400, 1600 & 1800.

1. Dimensions, Design and Strength requirements of
Reinforced Concrete Pipes of Class NP3
shall be as per the Table 3 of IS: 458/2003(Fourth
Revision) with up-to-date amendment

2. Spigot & Socket dimensions of NP3 Class Pipes shall be
as per Table 14 & Table 17 of IS:
458/2003 (Fourth Revision) with up-to-date amendment.

3. Rubber Ring chords used in the Pipe joints shall conform
to Type 2 of IS: 5382/1985
with up-to-date amendment.

Schedule- 5: Reinforced Concrete, Heavy duty, Non-pressure
Pipes, Class: NP4, with ends of
the pipes suitable for flush joints conforming to IS:
458/2003 (Fourth Revision)
with up-to-date amendment.

Nominal Diameter of Pipes in mm.
80, 100, 150. 200, 225, 250, 300, 350, 400, 450, 500, 600,
700, 800, 900, 1000,
1100, 1200, 1400, 1600 & 1800.

1. Dimensions, Design and Strength requirements of
Reinforced Concrete Pipes of Class NP4
shall be as per the Table 6 of IS: 458/2003 (Fourth
Revision) with up-to-date amendment.

Schedule- 6: Reinforced Concrete, Heavy duty, Non-pressure
Pipes, Class: NP4, with ends of
the pipes suitable for Socket & Spigot, roll on joints or
confined gasket joints
conforming to IS:458/2003 (Fourth Revision) with up-to-date
amendment along
with Rubber Ring conforming to Type 2 of IS: 5382/1985 with
up-to-date
amendment.

Nominal Diameter of Pipes in mm.
80, 100, 150. 200, 225, 250, 300, 350, 400, 450, 500, 600,
700, 800, 900,
1000,1100,1200, 1400, 1600 & 1800.
1. Dimensions, Design and Strength requirements of
Reinforced Concrete Pipes of Class NP4
shall be as per the Table 6 of IS: 458/2003(Fourth
Revision) with up-to-date amendment.

2. Spigot & Socket dimensions of NP4 Class Pipes shall be
as per Table 14 & Table 17 of IS:
458/2003(Fourth Revision) with up-to-date amendment.

3. Rubber Ring chords used in the Pipe joints shall conform
to Type 2 of IS: 5382/1985 with
up-to-date amendment.

Schedule-7: Reinforced Concrete Collar for Reinforced
Concrete, Light duty, Non-pressure
Pipes, Class: NP2 conforming to IS: 458/2003 (Fourth
Revision) with up-to-date
amendment.

Reinforced Concrete Collar for the Pipes, Class: NP2, size
(Nominal Diameter
in mm) , is as per below:
80, 100, 150. 200, 225, 250, 300, 350, 400, 450, 500, 600,
700, 800, 900,
1000,1100,1200, 1400, 1600 & 1800.

1. Dimensions and Design requirements of Reinforced
Concrete Collar for Pipes of Class NP2
shall be as per the Table 21 of IS: 458/2003(Fourth
Revision) with up-to-date amendment.
Schedule - 7 Transportation Charges:
Sub Item
Code No.
Item Description Distance in km. Transportation Charges in %
on the Total Cost of Pipes/
Collars
1 Upto 50 km.
2 Above 50 km. upto 100 km.
3 Above 100 km. upto 150 km.
4 Above 150 km. upto 200 km.
5 Above 200 km.
Inspection & Testing:
As per prevailing practice, the following Review of Reports
shall be carried out.
Review of Reports:
The following Reports shall be submitted to the Inspecting
Officer at the time of Inspection for
review:
During manufacture, Compressive Strength Tests shall be
conducted by the manufacturers on 150
mm Concrete Cubes in accordance with the relevant
requirements of IS: 456/2000 with up-to-date
amendment and IS: 516/1959 (Reaffirmed 1999) with up-to-
date amendment , as stipulated in clause
5.5.3 of IS: 458/2003 (Fourth Revision) with up-to-date
amendment. The manufacturer shall submit
the results of Compressive Strength Tests of Concrete Cubes
made from the Concrete used for the
pipes. Alternatively, if the manufacturers do not have the
facilities for Compressive Strength Test on
Concrete Cubes, they shall get the Test done at CSIDC
laboratory at least once in a month and
submit the report to the Inspecting Officer for review.
1. Manufacturer shall submit his own Certificate for
materials of construction used in the pipes.
2. Manufacturer shall submit Test Certificate for the Steel
used for Reinforcement.
3. Manufacture’s Test Repot of Rubber Rings shall be
submitted for review (incase of Pipes
with Socket & Spigot ends).
TESTS:
As per prevailing practice, the following Tests / Checking
shall be carried out.
1. Visual examination,
2. Permeability Test and
3. Three Edge Bearing Test to produce 0.25 mm crack.
4. Any other Tests that are mentioned in IS: 458/2003
(Fourth Revision) with up-to-date
amendment shall be carried out if desired by the Consignee.
NOTE:
1. The tolerances on Pipes shall be as per clause 8.2 &
tolerances on Collar shall be as per
Table No.21 of IS: 458/2003 (Fourth Revision) with up-to-
date amendment.
2. Workmanship & Finish of the Pipes & Collars shall be as
per Clause 9 of IS:
458/2003 (Fourth Revision) with up-to-date amendment.
3. The length in which the pipes are to be supplied shall
be as per the mutual agreement
between the purchaser and the supplier. However, the
recommended length above 300 mm
Nominal Diameter is 2.5 meters.
4. Curing of the pipes shall be done as per the Clause 7.4
of IS: 458/2003 (Fourth Revision)
with up-to-date amendment.
5. Rubber Ring chords used in the Pipe joints shall conform
to Type 2 of IS: 5382/1985 with
up-to-date amendment.
6. The following information shall be shall be clearly
marked on the each Finished Pipe.
a. Size of Pipe,
b. Class of Pipe, and
c. Name of manufacture.
7. The supplier shall guarantee the Pipes and Collars for a
period of 12 months from the date of
receipt of the materials by the consignee.
8. For Reinforced Concrete Pipes Rates must be quoted on
the basis of Per Meter length and in
the case of Collars Rates shall be quoted on the basis of
Per Piece. (The cost of the
Rubber Ring shall be included in the Rate per Meter length
of the Pipe.

towards the supply of Rubber rings will be made) as per the
prevailing practice,
transportation cost for Pipes & Collars shall be quoted
separately.

Answer / kalpesh mistry

Basic Difference between NP@, NP3 & NP 4 is due to qulity
of product. Thichness is not main difference , NP@ is is
used for normal flow and condition, NP 3 & NP 4 is used for
heavy work for durability also prefer higher class

Answer / s k

NP-2 is collar joint & NP-3 is Rcc Ring with wicer joint

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