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Question
what is the diffrence between mmwc and kg/cm2 for pressure 
measurment when we are using mmwc and when kg/cm2 and why?????
?? what is the reason
 Question Submitted By :: Instrumentation
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
when we r measuring very low pressure :: mmWC
and measuring high pr. :: kg/cm2/bar/psi... ok
for example we r measuring like boiler furnaces
pressure(draft) i.e very low pr.(250mmWC) so we r measuring
in mmWC, and when we r calibrating the transmitters (flow
and level) that time also we r calling transmitters range
also mmWC ok

here note the point is 10,000 mmWC = 1 Kg/cm2 then
1mmwc=0.0001kg/cm2 ok
 
Is This Answer Correct ?    338 Yes 28 No
Mail2noor.hyd
 
Answer
# 2
10000 mmwc equals to 1 kg/cm2.
For low ranges pressure is mentioned in MMWC otherwise in
any other pressure units.
 
Is This Answer Correct ?    118 Yes 14 No
Vaibhav V T
 
 
 
Answer
# 3
Mostly both are units of pressure. when we measure the very
low pressure than it is expressed in mmwc else higher
pressures are measured in kg/cm2. low pressure can also be
used for but the error in values will be more.
Basically 10000 mmwc is 1 kg/cm2 a.
 
Is This Answer Correct ?    72 Yes 9 No
Dhirendra
 
Answer
# 4
N/m2 is SI Unit and Kg(f)/cm2 is MKS Unit.

1 Kg/cm2 is 1.033 bar or 1.033x10^5 N/m2
10000 mmwc= 1 kg/cm2
 
Is This Answer Correct ?    65 Yes 9 No
Dilip
 
Answer
# 5
Mostly both are units of pressure. when we measure the very
low pressure than it is expressed in mmwc else higher
pressures are measured in kg/cm2. low pressure can also be
used for but the error in values will be more.
Basically 10000 mmwc is 1 kg/cm2 a.
 
Is This Answer Correct ?    12 Yes 2 No
Tapan Das
 
Answer
# 6
Mostly both are units of pressure. when we measure the very
low pressure than it is expressed in mmwc else higher
pressures are measured in kg/cm2. low pressure can also be
used for but the error in values will be more.
Basically 10000 mmwc is 1 kg/cm2 a.In thermal power plant mmwc is most useful in boiler side.
 
Is This Answer Correct ?    13 Yes 3 No
Prashant Meena
 
Answer
# 7
both r units for pressure,.but,mmwc(millimeter water column)is
very low pressure means less than zero.here, 10000mmwc=1kg/cm2.we may consider the mmwc as vaccum.
 
Is This Answer Correct ?    8 Yes 0 No
M.vijay Kumar
 
Answer
# 8
both r units of pressure itself..but when the system is in
vacuum then the pressure measured in mmwc and the positive
pressure measured by kg/cm2.so for low pressure mmwc used
and for high pressure kg/cm2 is used..
 
Is This Answer Correct ?    7 Yes 3 No
Chirag Darji
 
Answer
# 9
We are using the mmWC for very low or lower than 0 and more than 0 we are using Kg/cm2. 
Is This Answer Correct ?    3 Yes 3 No
Sk Singh
 
Answer
# 10
when we r measuring very low pressure :: mmWC and general terms is Draft pressure and measuring high pr. :: kg/cm2/bar/psi...for example we r measuring like boiler furnaces pressure and flue gas path (draft) i.e very low pr.(250mmWC) so we r measuring in mmWC, and when we are calibrating the flow, draft and level transmitters we will indicate the range in mmWC. The error value for FSD will be higher side for the transmitters which are calibrated in mmWC. 
Is This Answer Correct ?    0 Yes 0 No
Manimaran
 

 
 
 
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