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AMENDMENT NO. 3 JUNE 2018
TO
IS 3597 : 1998 CONCRETE PIPES — METHODS OF TEST
(Second Revision)
[(Page 4, clause 7.2.4 (see also Amendment No. 1)] — Substitute the following for the existing clause:
‘7.2.4 Pressure shall be maintained by continuous pumping the water using throttling device for 1 min + 30 s for
each 10 mm of wall thickness (for precast concrete pipes wall thickness shall be full barrel wall thickness, whereas
it shall be core thickness, in case of prestressed concrete pipe) or for twice that entire period, if the application of
pressure resulted in the formation of beads of water on the pipe surface.’
(Page 5, Fig. 5) — Insert the following new clause at the end:
‘10 SOCKET AND SPIGOT DIAMETERS
10.1 Socket Diameter (Jointing Surface)
10.1.1 Procedure
The socket diameter shall be checked by measuring the sway by touching the two points B and B1 along the
circumference of socket (see Fig. 6) BB1 gives the sway.
FIG. 6 ARRANGEMENT FOR MEASURING SWAY
Example:
Suppose the theoretical diameter of socket, D = 1 383 mm
+2
Permissible variation = −0.5 mm
Price Group 3
1
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Amendment No. 3 to IS 3597 : 1998
The maximum diameter, D1 = 1 385 mm
The minimum diameter, D2 = 1 382.5 mm
The sway, S = 2 ×[h× (D1 – h)] ½
Assume h (see Fig. 6) = 5 mm
Sway, S = 2 ×[5× (1 385 – 5)] 1/2
= 2 ×[5× (1 385 – 5)] 1/2
= 2 × 83
= 166 mm
Length of gauge, L
L2 = (S/2)2+ (D1 – h) 2
= (166/2)2+ (1 385 – 5)2
= 6 889 + 1 904 400
L = 1 382.5 mm
This should not be more than the minimum permissible inside diameter.
Therefore, in this case, L = 1 382.5 mm
Maximum permissible sway = 166 mm
10.2 Spigot Diameter
10.2.1 Procedure
The gauge as shown in Fig. 7 shall be used.
STRIP 2.5 mm NOT TO GO
ROLL ON JOINT CONFINED JOINT
FIG. 7 ARRANGEMENT FOR CHECKING SPIGOT DIAMETER
2
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Amendment No. 3 to IS 3597 : 1998
Example:
Suppose the theoretical outside diameter of spigot = 1 200 mm
Permissible variation = ± 1 mm
The maximum diameter = 1 201 mm
The minimum diameter = 1 199 mm
To enable gauge to pass over the spigot surface, the diameter must be more by 1mm than the maximum spigot
diameter.
The clearance between gauge points = 1 200 +1+1
= 1 202 mm
For checking spigot, the gauge is held in the position as shown in Fig. 7. Then by keeping point ‘X’ fixed, other
end ‘Y’ of gauge is moved over the circumference of spigot, where the gap between spigot surface and
gauge is maximum, a strip 2.5 mm thick and 25 mm wide (straight side) is inserted. The available gap being
1 201–1 199 = 2 mm, it should not go. Two checks shall be done at 90° to each other.
11 BOILING ABSORPTION TEST
11.1 Test Specimen
Core pipe / lined cylinder pipe shall be fixed on coating machine and soap solution shall be applied on outside
surface of plain pipe barrel for about 1 m in length. The cement mortar coating having thickness 22 to 25 mm
shall be applied on the pipe at this portion. Coated pipe shall be removed from coating machine and shall be
placed on sand bed. After 10 to 15 min, 25 to 30 mm width grooves shall be made on green coating along the
longitudinal direction up to the full depth of cement mortar coating at 150 mm spacing. Green coating shall be
covered with reinforced plastic sheet immediately. Coated pieces shall be taken out on the next day and shall be
cured in the same manner as pipe is cured. Pieces shall be cut to get samples of size 100 × 100 mm by using
concrete cutter.
11.2 Test Procedure
Three specimens of uniform coating thickness shall be selected for test and shall be put in aoven at a
temperature of 105 to 115°C for minimum 24 h. Oven-dried specimens shall be weighed immediately after
removal from the oven. Specimens shall be allowed to cool to the room temperature. After cooling of
specimens, it shall be placed in tap/distilled water having temperature in the range of 10 - 24°C. Water shall be
heated to boil and the boiling should take place in not less than 1 h and not more than 2 h. Boiling of the water
shall be continued for further 5 h. At the end of 5 h boiling period, heat shall be turned off and samples shall be
allowed to cool in the same water to room temperature by natural water cooling period of 14h to 24h.
Specimens shall be removed from the water and shall be allowed to drain by placing on an open drain rack for
1 min. Remaining superficial water shall be removed by blotting the specimen with a dry absorbent/blotting
paper. Specimens shall be weighed immediately after blotting.
11.3 Calculations
Increase in mass of boiled specimen over its dry mass shall be calculated as the water absorption by specimen
and shall be expressed it as a percentage of the dry mass.
Percentage for each specimen shall be calculated as below:
Mass of dry specimen (Oven dried) = M1
Mass of specimen after 5 h boiling and natural water cooling period of 14h to 24h = M2
𝑀𝑀2 − 𝑀𝑀1
Boiling water absorption of specimenin percentage = × 100
𝑀𝑀1
3
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Amendment No. 3 to IS 3597 : 1998
12 PRESSURE PERMEABILITY TEST ON CEMENT MORTAR COATING OF FINISHED PIPES
12.1 Procedure for Pressure Permeability Test
12.1.1 Apparatus
The apparatusas shown in Fig. 8, shall consist of,
a) permeability cup of dimensions of 3 000 mm2 inside cross-sectional area with clamping
arrangement on the coating of the finished pipe.
b) rubber pad for water tight sealing between permeability cup and pipe coating surface.
c) graduated acrylic tube attached to permeability cup with a suitable pressure gauge at its upper end.
d) a source of compressed air (compressor/foot rested pump) to give a regulated constant pressure of
3 ± 0.2 kg/cm2 connected at the upper end of acrylic tube by hose pipe.
e) mild steel clamping device and eye bolts with wire ropes for clamping cup on pipe coating
surface.
FIG. 8 TYPICAL PRESSURE PERMEABILITY TEST ARRANGEMENT
12.1.2 Procedure
a) The cover coat of the pipe shall be fully saturated with water prior to testing.
b) Scrap the dry coating of the pipe by wire brush, remove loose particles, if any.
c) Clamp the equipment on coating as shown in Fig. 8 and fill the water in acrylic tube up to level by
wash bottle.
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Amendment No. 3 to IS 3597 : 1998
d) Install the pressure gauge at top of the tube using Tee connection and compressed air source to be
fitted to Tee connection.
e) Chock whole assembly shall be checked for leaks under the required pressure of 3 kg/cm2. If leak is
observed, tight the fittings to get water tight connection.
f) Maintain the pressure of 3 kg/cm2 by using pressure regulator throughout the test.
g) Record the drop in water levels at 60 min intervals under sustain pressure of 3 kg/cm2 up to 6 h.
12.1.3 Test Acceptance Criteria
The ratio of cumulative absorption per hour to area of cup orifice in contact with the pipe surface is to be
calculated. The ratio shall not exceed 0.15 / h for the period between 121 and 180 min. If this requirement has
not been attained in the above stipulated period, the test is to be continued for further periods either 240, 300,
360, 420 or 480 min until the requirement is met. If the requirement has not been met at 480 min, the pipe has
failed to the test, and in such case further 2 pipes from the batch shall be tested. If both pipes pass the test the
batch shall be accepted, otherwise the same shall be rejected.
(CED 53)
Publication Unit, BIS, New Delhi, India
