Three sensors are mounted on a vessel (V) at elevation of 6000 mm (sensor A), 6600 mm (sensor B) and 7200 mm (sensor C). These three level switches generate a trip signal (2oo3 voting logic) to stop flow from upstream system to vessel (v).
Can we use sensor A to control level in vessel (V)? On...
Pls share your experience for flare main headers cleaning in shutdown. What methods are used water flushing/ hrdojetting/pigging....
Possible material in flare headers if PP resin, lube oil etc.
Adsorbent beds are designed for a certain capacity based upon design flow rates of fluid and impurity loading. In actual conditions fluid flow rates may vary depending upon plant throughput variation, short outage etc. Can we use fluid flow rate through bed to find time to regenerate the bed? Or...
We have an ethylene dryer bed to remove trace quantity (ppm level) of moisture before it is fed to the reaction system. There are ceramic (Alumina) support ball at bottom and top of the bed. Recently for bed replacement we have regenerated it with nitrogen to remove hydrocarbons and did steam...
We have an ethylene system pre heater, shell side low pressure (LP) steam (4-5 kg/cm2), tube side ethylene (inlet pressure 40 bar, inlet temperature 30 deg C, outlet pressure 40 bar, outlet temperature 100 deg C). Ethylene outlet temperature is maintained by shell side LP steam. There is a...
I wanted to know the applications where strainer (filter) is used at pump discharge. What r the advantages and disadvantages of strainer at pump discharge vs at suction. We have a double diaphragm pump. Application is slurry service with very low flow rate 3 to 7 kg per hour.
We have a VFD (Variable frequency drive) motor driven double diaphragm pump, pumping liquid Teal (sp. gravity 0.829) with 30-37 kg/cm2(g) differential pressure. Pump normal capacity is 10 LPM and minimum capacity 0.15 LPM.
Pump primary capacity adjustment is with drive motor speed variation...
In our single stage centrifugal compressor primary seal gas is ethylene. N2 is provided as backup in case C2 pressure drops due to any reason. What is the safe logic for seal changeover from C2 to N2? Primary Seal gas flow control valve and flow transmitter is in vendor package. There are...
We have a metering (diaphragm) type pump with design suction pressure 4.5 barg, discharge pressure 42 barg, flow rate 8 LPM. What may be the possible adverse effects on pump, its performance if suction pressure goes abnormally high for eg. say 40 barg?
Low pressure (4.5 kg/cm2) steam is generated by flashing high pressure (42 kg/cm2) condensate in a flash tank. This LP steam is used in the plant which reduces LP steam import from CPP plant.
Due to under design of high pressure condensate flash tank we are not able to completely line up HP...
Recently Ethylene dryer bed got fully choked, taken out of service and isolated. While N2 purging to remove hydrocarbons entrapped there is no flow of N2 through the bed. What are the alternate methods to make the bed hydrocarbon free?
We have a highdraulic oil operated valve. Hydraulic oil pump discharge pressure is 150 bar. Over a period of time oil overheats (to around 63 deg C) and high temp alarm is generated. If we take pump changeover then oil temperature comes down to normal (around 50 deg C). There is oil leakage (one...
How can we ensure the reliability of ESD solenoid valves? which combination is better (two solenoids in series Vs parallel, 1oo1 Vs 2oo2 logic) if we have redundant solenoid valves to initiate tripping.
What is the effect of MDEA concentration on H2S absorption in Amine Absorber. We are using 30% amine solution. If more concentrated solution is used, what are the advantages in absorption and regeneration? Is it true that upto 40% MDEA concentration absorption is nearly constant?
we have a LP condensate flash drum. The flashed steam passes through fin fan cooler, and return of fin fan cooler goes back in the drum as shown in the fig (attachment). The return line is submerged in the tank below the normal level. What is the purpose of submerged return line?can't it be...
we have a LP condensate flash drum. The flashed steam passes through fin fan cooler, and return of fin fan cooler goes back in the drum. The return line is submerged in the tank below the normal level. Pressure in the drum is maintained by venting in the atmosphere or putting nitrogen in the fin...
For every material there is a specified design pressure and design temperature. Now if i am operating at a pressure less then design pressure, can I go on operating at higher than design temperature. Example: for a refractory lined killed carbon steel design pressure is 4.4 Kg/cm2 (g) and design...
we have 3 LP steam generators (2 in line, 1 standby). there is one phosphate dosing pump. we were doing batch wise dosing in two generators (4 hours in each). Due to batchwise addition, phosphate concentrtion and pH in CBD was fluctuating. we desided to make it continuous dosing. but we are...
What may be the maximum operating pressure of a system containing pilot PSV. If PSV set point is x then what may be the maximum operating pressure as % of x. What do codes (API) state?
