Answer / ganesh kumar

surgng is revarsal of flow accompained with pr drop in
centrifugal or axial compressors

Answer / mubashar ali

Its the reversal of flow in case of centrifugal compressors.

Answer / satish yadav

low suction flow and high discharge press. then surging will occur

Answer / balasubramanian iyer

Balasubramanian Iyer, Indian Oil Coropration Limited,
balasubramanian.n@aol.in
Anti Surge is a process witnessed only in Centrifugal
compressors as Kinetic Energy of the fluid is converted
into the Pressure energy.
Surging is not witnessed in Reciprocating Compressors, as
they are positive displacement Equipments where the
pressure increased is by volume reduction, hence providing
anti surge in reciprocating is not envisaged and not proper.
Anti Surge is witnessed when the flow to the Centrifugal
Compressor is reduced or the density of the fluid entering
the Compressor is altered to greater extent, pressure is
reduced to a lower extent. the surge valve opens and
increases the flow to the suction there by bringing back
the condition to normal operation there by saving the
equipment from damage.
Spill back on the other hand is one way of controlling the
exit flow to the downstream section from the compressor.
One should not confuse with surge control valve and spill
back controller

Answer / ramana reddy

The operation of a compressor at flows lower or output
pressure more than that at a "surge line" causes unstable
compressor operation. "Surging" occurs

I am a Diploma Chemical Engineer by Nirma Uni; and BEng (Hons) Energy & Environmental Engineer by Napier Uni; Edinburg, UK. HPCL chemical engineering test will held on 14th July,09. So, Please send me some previous chemical engineering papers Objective types Or material to give the test.

0 Answers   HPCL,

MASS TRANSFER - EXAMPLE 4.1 : A concentric, counter-current heat exchanger is used to cool lubricating oil. Water is used as the coolant. The mass flow rate of oil into the heat exchanger is 0.1 kg / s = FO. For oil, the inlet temperature TIO = 100 degree Celsius and the outlet temperature TOO = 55 degree Celsius. For water, the inlet temperature TIW = 35 degree Celsius and the outlet temperature TOW = 42 degree Celsius. What is the mass flow rate of water in kg / s, FW needed to maintain these operating conditions? Constant for heat capacity of oil is CO = 2131 J /(kg K) and for water is CW = 4178 J /(kg K). Use the equation (FO)(CO)(TIO ?TOO) = (FW)(CW)(TOW ?TIW).

1 Answers  

FOOD ENGINEERING - QUESTION 23.1 : (a) According to United States Department of Agriculture (USDA) (http://ndb.nal.usda.gov/ndb/search/list, accessed 12 August 2016), 100 g of potatoes generate 77 kcal of energy. For raw tomatoes, 111 g have 18 kcal of energy. Question : How much energy will one gain if 150 g of heated potatoes are eaten with 200 g of raw tomatoes? (b) If 1 Calorie = 1 food Calorie = 1 kilocalorie and 1000 calories = 1 food Calorie, then how many Calories are there in 9600 calories? (c) According to a food package of potato chips, 210 Calories are produced per serving size of 34 g. In actual experiment of food calorimetry lab, 1.75 g of potato chips, when burnt, will produce 9.6 Calories. For each serving size of potato chip, find the difference of Calories between the actual experimental value and the value stated on the food package. (d) The specific heat of water is c = 1 cal / (g.K) where cal is calorie, g is gram and K is Kelvin. Then what is the temperature rise of water, in degree Celsius, when 150 g of water is heated by 9600 calories of burning food?

1 Answers  

hai i A neelakanteswara rao ,selected for the interview on 15th july 2008. I completed my diploma in chemical engineering.let me know how to face the interview& the type of technical questions.

0 Answers   IOCL,

BIOCHEMICAL ENGINEERING INSTRUMENTATION - EXAMPLE 29.2 : (a) In order to determine the slurry volume (L) in chromatography, arrange the formula using the following parameters : slurry concentration (%), slurry volume (L), settled chromatography medium volume (L), 100. (b) In order to determine the chromatography medium volume (L) in gel filtration chromatography, arrange the formula using the following parameters : sample volume to be processed (L), chromatography medium volume (L), sample volume in percent of total column volume (%), 100.

1 Answers  

what is the PH value for boiler water.

12 Answers  

Explain what information is needed to specify a mixer?

0 Answers  

send me previous year question paper for ongc gt 2011 written exam

0 Answers   ONGC,

Why do we apply on iron articles?

0 Answers  

FOOD ENGINEERING - QUESTION 23.2 : (a) A dryer reduces the moisture content of 100 kg of a potato product from 80 % to 10 % moisture. Find the mass of the water removed in such drying process. (b) During the drying process, the air is cooled from 80 °C to 71 °C in passing through the dryer. If the latent heat of vaporization corresponding to a saturation temperature of 71 °C is 2331 kJ / kg for water, find the heat energy required to evaporate the water only. (c) Assume potato enters at 24 °C, which is also the ambient air temperature, and leaves at the same temperature as the exit air. The specific heat of potato is 3.43 kJ / (kg °C). Find the minimum heat energy required to raise the temperature of the potatoes. (d) 250 kg of steam at 70 kPa gauge is used to heat 49,800 cubic metre of air to 80 °C, and the air is cooled to 71 °C in passing through the dryer. If the latent heat of steam at 70 kPa gauge is 2283 kJ / kg, find the heat energy in steam. (e) Calculate the efficiency of the dryer based heat input and output, in drying air. Use the formula (Ti - To) / (Ti - Ta) where Ti is the inlet (high) air temperature into the dryer, To is the outlet air temperature from the dryer, and Ta is the ambient air temperature.

1 Answers  

What is a common source of error in determining the percent spent caustic in refinery applications?

0 Answers  

i need formula for calculating discharge of river, the data i have is variation of water pressure, variation of air pressure,depth of water and length of river. please i need help

1 Answers