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IS 9201 (1987): Pumps for handling slurry [MED 20: Pumps]
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Satyanarayan Gangaram Pitroda
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UDC 621.671.035
IS : 9201 - 1987
Indian Standard ( Reaffirmed 2003 )
I
SPECIFICATION FOR
PUMPS FOR HANDLING SLURRY
( First Revision )
1. Scope - Coversthe technical requirements for centrifugal pumps for handling slurry of size
not exceeding 6 mm enveloping circle.
2. Units, Terminology and Classification - Units, terminology and classification relating to
pumps for handling slurry shall be as specified in IS : 5120-I 977 (Technical requirements for
rotodynamic special purpose pumps ( first revision ).
3. Characteristics of Slurry - Characteristics of typical slurries handled by these pumps
depend upon the nature and concentration of solids present in the mixture and properties of the
liquid carrier ( usually water ). Slurries with concentrations varying up to 70 percent of solids
by mass may be pumped through pipelines.
4. Nomenclature - Nomenclature of the parts commonly used in pumps for slurry shall be as
given in Fig. 1 and 2.
I 5. Materia-Is
5.1 It is recognized
of Construction
that a number of materials of construction are available to meet the needs
for pumps handling slurry. Typical construction for different parts is given in Fig. 1 and 2.
5.2 Gaskets, Seals and Packings - Gaskets, seals and packings used for pumps handling slurries
shall conform to those specified in IS : 5120-1977.
5.3 The pump components,. where necessary, shall be of abrasion resistant hard material or shall
be rubber lined with good quality hard rubber ( ebonite ) having shore hardness of 70 to 79. The
rubber lining shall be done in accordance with IS : 4682 ( Part 1 )-I 968 Code of practice for
lining of vessels and equipment for chemical processes: Part 1 Rubber lining.
I 6. Direction
6.1 The direction
of Rotation
of rotation of pumps shall be designa~ted clockwise or anti-clockwise as
observed when looking at the pump shaft from the driving end.
6.2 The direction of rotation shall be clearly marked either by incorporating an arrow in the
casing or by a separate metal arrow securely fitted to the pump.
7. Accessories - In addition to essential and optional accessories specified in IS : 5120-I 977,
provision shall be made for fitting the auxiliary piping as indicated below:
a) Stuffing box sealing water connections shall be provided to the lantern rings,
b) Impeller back vanes flushing arrangements shall be provided to the stuffing box
( optional ),
c) The position of inspection hand holes with covers in suction and volute chamber of pump
is optional, and
d) Stuffing box cooling water connection shall be provided for pumps handling liquid above
95C.
I 3. Suction Limitations
8.1 Among the more important factors affecting the operation of a centrifugal pump are the
suction conditions. Abnormally high suction lifts beyond the suction rating of the pump usually
cause considerable reductions in capacity, head and efficiency often leading to serious trouble,
such as vibration and caviation.
I Adopted 28 August 1987
I
@ August 1988, BIS
I
Gr 3
I
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
IS : 9201 - 1987
S/No. Description Materials
1. Suction cover Cast iron grade minimum FG 200, IS : 21 O-1978
Specification for grey iron castings ( third revision )jcast iron alloyjNi-hard/steel
alloy
2. Casing Cast iron grade minimum FG 200, IS : 210-I 978/east iron alloyjNi-hard/steel
alloy
3. Suction cover liner Natural rubber/stainless steel alloy
4. Gland side liner Natural rubber/stainless steel alloy
5. Impeller Natural rubber/Ni-hard/steel alloy
6. Stuffing box Cast iron grade minimum FG 200, IS : 210-19781cast iron alloy
7. Shaft sleeve Stainless steel alloy ( 300-600 BHN )
8. Shaft Stainless steel ( minimum 12% Cr, IS : 6603-I 972 Specification for stainless
steel bars and flats )
9. Gland Stainless steel alloy/bronze
w
IO. Throat bush PTFE
11. Seal cage PTFE
12 Bearing bracket Cast iron grade minimum FG 200, IS : 210-1978/east iron alloy
13. Oil seal housing Cast iron grade minimum FG 200, IS : 210-I 978;cast iron alloy
14. Ball bearing Standard quality
15. Ball bearing Standard quality
16. Adapter Cast iron grade minimum FG 200, IS : 21 O-1978jcast iron alloy
17. Bearing housing Cast iron grade minimum FG 200, IS : 21 O-1978ycast iron alloy
18. Key for shaft Stainless steel ( minimum 12% Cr, IS : 6603-I 972 )
Note - The shape, material and arrangement of parts are for guidance only and are not intended to limit the &sign
FIG. 1 SLURRY PUMP (WITH LINER)
IS : 9201 - 1987
SI Description Materials
No.
1. Casing Ni-hard ( 450 to 600 BHN )
2. Suction wear plate Ni-hard ( 450 to 600 BHN )
( Optional )
3. Gland side wear plate Ni-hard ( 450 to 600 BHN )
4. Wear plate seal ring Rubber
5. Impeller Ni-hard ( 450 to 600 BHN )
6. Stuffing box Cast iron grade minimum FG 200, IS : 21 O-l 978/east iron alloy
7. Shaft sleeve Stainless steel alloy ( 300-600 BHN )
8. Shaft Stainless steel ( minimum 12% Cr, IS : 6603- 1972 )
9. Gland Stainless steel alloy/bronze
10. Throat bush PTFE
11. Seal cage PTFE
12. Bearing bracket Cast iron grade minimum FG 200, IS : 21 O-l 978/east iron alloy
13. Oil seal housing Cast iron grade minimum FG 200, IS : 210-1978,cast iron aIIoy
14. Ball bearing Standard quality
15. Ball bearing Standard quality
16. Adapter Cast iron grade minimum FG 200, IS : 21 O-l 978/east iron alloy
17. Bearing housing Cast iron grade minimum FG 200, IS : 21 O-l 978/east iron alloy
18. Key for shaft Stainless steel ( minimum 12% Cr, IS : 6603-1972 )
Note - The shape, material and arrangement of parts are for guidance only and are not intended to limit the
design.
FIG. 2 SLURRY PUMP (WITHOUT LINER )
IS:9201 : 1987
8.2 Cavitation can be described as the condition existing in following liquids when the pressure
at any point falls below the vapour pressure of the liquid at the prevailing temperature.
Some of the liquid flashes into vapour and bubbles of the vapour are carried along with
the liquid. If this happens in the suction area of a centrifugal pump or within the entrance
of the impellers, the bubbles are carried into the impeller and undergo an increase in pressure
and, therefore, condense and finally collapse.
8.2.1 Effects of cavitation - The effects of cavitation are:
a) damage to material,
b) cavitation noise,
c) vibration due to the collapse of the bubbles, and
d) deterioration in performance of the pump.
9. Factors Affecting Pump Performance - Factors arfecting pump performance are the same
as those specified in IS : 5659-l 970 Specification for pumps for process water.
10. Design Features
10.1 The pumps may employ the hydroseal principle. The lining may be of natural rubber,
neoprene rubber or other synthetic material depending upon the chemical and abrasive action of
slurry.
10.2 The pumps may be made with enclosed chamber with wide passage to permit lower speed
operation for reduced abrasive wear.
10.3 In case of semi-open, the rotating assembly shall be provided with wear adjustment at
bearing frame to allow for impeller clearance due to wear.
10.4 The prime mover shall be of such a capacity as to provide under working site conditions, a
power which is more than the maximum power required by the pump at any point in the operating
range under site conditions, the difference being a minimum of 15 percent.
11. Information to be Supplied by the -Purchaser and the Supplier - The information
to be supplied by the purchaser and the supplier shall be the same as that specified in
IS : 5120-1977.
12. Pump Tests
12.1 Pump testing arrangement shall be as specified in IS : 5120-I 977.
12.1 .I The tolerances on performance shall be as given in IS : 5 120- 1977 or IS : 10981-I 983
Code of acceptance test for centrifugal mixed flow and axial pumps - Class B as per agreement
between the purchaser and the supplier.
12.2 The pump casing shall be of robust construction and tested to withstand a hydrostatic test
Pressure of 1.5 times the maximum discharge pressure. The test shall be carried out for
IO minutes.
12.3 During testing of the pump, the suction lift shall remain steady as declared by the
manufacturer.
13. General Requirements - The general requirements for slurry pumps shall be as given in
IS : 5120-l 977.
14. Standard Marking - Details available with the Bureau of Indian Standards.
EXPLANATORY NOTE
The standard was first issued in 1979 and this revision has been taken up to include the
following modifications in the standard:
a) Revised sectional drawings have been included to indicate the nomenclature for pumps.
b) A thorough change has been made in clause pertaining to pump tests.
c) Requirement has been laid in regard to the suction lift of the pumps.
6
Printed at Printograph, New Delhi, India
