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Dynamic design of Pump Foundation

 
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sandeepb
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Joined: 26 Jan 2003
Posts: 29
Location: New Delhi

PostPosted: Sat Mar 19, 2011 3:20 am    Post subject: Dynamic design of Pump Foundation Reply with quote

Dear All,

What is the design criterion for foundation design of Pump foundation?

I have a pump having total 5 ton wt. Shall I have to go for dynamic design?

As per design criterion, I have to follow BS CP 2012 Part 1.

Regards,
Sandeep Barwal
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sukanta.adhikari
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PostPosted: Sat Mar 19, 2011 4:16 am    Post subject: Re: Dynamic design of Pump Foundation Reply with quote

Dear Mr Sandeep,

5 ton seems to be total static weight of pump.You have to ask for the dynamic load.After that we can discuss further on design criteria.

Regards,
S.Adhikari

sbarwal1 wrote:
Dear All,

What is the design criterion for foundation design of Pump foundation?

I have a pump having total 5 ton wt. Shall I have to go for dynamic design?

As per design criterion, I have to follow BS CP 2012 Part 1.

Regards,
Sandeep Barwal
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sarfaraj.husain
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Joined: 26 Jan 2003
Posts: 90

PostPosted: Sat Mar 19, 2011 4:59 am    Post subject: Dynamic design of Pump Foundation Reply with quote

5.0 t not a heavy load..............y12@150 b/w at face & y10@600 in mesh form in the block is sufficient.......no need for dynamic analysis...just check wt of foundation at least 3-4 times of weight.....


sarfraj



[SEFI] Re: Dynamic design of Pump Foundation
sukanta.adhikari to: general  03/19/11 09:50 AM


From: "sukanta.adhikari" <forum@sefindia.org>  
To: general@sefindia.org        Please respond to general@sefindia.org  



Dear Mr Sandeep,

5 ton seems to be total static weight of pump.You have to ask for the dynamic load.After that we can discuss further on design criteria.

Regards,
S.Adhikari
sbarwal1 wrote:  Dear All,

What is the design criterion for foundation design of Pump foundation?

I have a pump having total 5 ton wt. Shall I have to go for dynamic design?

As per design criterion, I have to follow BS CP 2012 Part 1.

Regards,
Sandeep Barwal





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vikram.jeet
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PostPosted: Sat Mar 19, 2011 6:20 am    Post subject: Dynamic design of Pump Foundation Reply with quote

Pump Foundation
Please refer to IS Code 2974 part IV. Clause 6.2.2 deals with pump foundation
This is very useful code on Foundation for ROTARY type machines
of low frequency

Extracts from code:

Total load=( Mass of pump*3) + Other constructional load

Dynamic analysis
Insufficient clearance between impeller and casing tend to incrrease the pressure
surges and the encasing wave propagate through the water to the casing and
to the foundation.The frequency of this type of vibration is given below.
Frequency f= Nn/60

Necessary data from manufacturer
Mass of pumps
Details of anchor bolts, channels and other embedments in found
Frequency of pressure change in pump discharge
Speed of pump
Unbalanced forces
No of impeller vanes  


Clause 5.2.3 - - As a guide mass of foundation shall be at least 2.5 times
the mass of whole machine.

best regds

vikramjeet


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lele_raj
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PostPosted: Sat Mar 19, 2011 7:56 am    Post subject: Dynamic design of Pump Foundation Reply with quote

Sukanta / Sandeep,

My suggestion: Pl. consider whether the pump is reciprocating type. Secondly, pl. analysis the footing for its natural frequency and ensure that it's not even close to at least second fundamental frequency. Overall, as a thumb rule, depending on the type of footing, a "safe" foundation for the large, heavy rotating machinery is normally 2.5-3 times the dead load of the equipment itself.

One important thing: Ensure that the tension bolts are well-embedded in concrete. Inadequate cover is sometimes the cause of the start of vibrations which worsens over the period and, in extreme case, may lead to the failure of the foundation. So, what appears to be a "dynamic" failure can have its roots in the "static" factors.

In the case of foundations, it's always better to err on the safe side.


Best regards,

Rajendra (Raj) Lele





From: sukanta.adhikari <forum@sefindia.org>
To: general@sefindia.org
Sent: Sat, 19 March, 2011 3:16:42 PM
Subject: [SEFI] Re: Dynamic design of Pump Foundation

     Dear Mr Sandeep,

5 ton seems to be total static weight of pump.You have to ask for the dynamic load.After that we can discuss further on design criteria.

Regards,
S.Adhikari

      sbarwal1 wrote:                Dear All,

What is the design criterion for foundation design of Pump foundation?

I have a pump having total 5 ton wt. Shall I have to go for dynamic design?

As per design criterion, I have to follow BS CP 2012 Part 1.

Regards,
Sandeep Barwal

Posted via Email
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sandeepb
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Joined: 26 Jan 2003
Posts: 29
Location: New Delhi

PostPosted: Sat Mar 19, 2011 11:19 am    Post subject: Re: Dynamic design of Pump Foundation Reply with quote

Currently I have only this much detail (Only static loading) as per vendor print. It means there is no need for dynamic design ???

Regards,
Sandeep
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gpsarathyy
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Joined: 28 Jun 2010
Posts: 481
Location: chennai

PostPosted: Thu Feb 20, 2014 5:52 pm    Post subject: Reply with quote

Dear Sefians,

I too have a doubt on which basis we have to classify the pump foundation as static foundation or dynamic foundation.

  • Based on the weight of the pump ?
  • Based on the dynamic loads given - now most of the pump vendor they are not giving any dynamic loads.
  • Based on RPM ?
  • Based on unbalanced forces ? - now most of the vendor, they are not giving any unbalanced forces in their dwg.

Experts are requested share their opinion.

_________________
G.PARTHASARATHY M.E. CEng(UK), MICE., MIE.,
CHENNAI
GPSARATHYY@GMAIL.COM
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