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Thanks LittleInch and georgeverghese for your replies.

Thanks LittleInch, Can you elaborate, why it is not acceptable as an ESD trio system. How it will affect effectiveness of 2oo3 logic system.

AS flare knock out drum (KOD) is designed for low pressure so following procedure may be adopted for purging the flare system before taking it in line: 1. Close flare KOD outlet valve. 2. Open N2 from all sweep points in flare headers. (can remove RO for in N2 sweep points for purging purging...

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...

Yes, we will check strength of supports and piping.

Thanks for responding. Flare headers are approx 20 years old. there is possibility of PP (polypropylene) resin and lube oil in the headers. Headers are of 24", 40" diameter. From the pipe racks these headers join to the flare knock out pot (KOP) where there are isolation valves, there are no end...

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.

Thanks for valuable inputs.

Thanks don1980 and georgeverghese Actually we were trying to optimize regeneration frequency to save cost. Some times our beds operate at reduced flow rate as compared to design. So is it better to regenerate the bed based upon total flow passing through it or we shall fix a time (no. of...

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...

Thanks for response Compositepro, What may be reasons for polymerization of ethylene on the surface of the Alumina?

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...

In a standard flare system design there are thermocouples around pilot burners, if pilots are burning they show temp in the range of 350-450 deg C. If this temp drops below 200 deg C then there is high probability that pilot is not burning. Try to see in the night from a nearby elevated...

Bursting pressure in data sheet is 13kg/cm2.

Dear don 1980, Steam side operating temperature is 140-150 deg C. Burst temperature specified is 100 deg C. Burst temp specified in data sheet is 13 kg/cm2. Flare back pressure is considered 2 kg/cm2. Stamped bursting pressure is 11 kg/cm2. As you mentioned what is vacuum support?

Dear little inch, This preheater is used to heat ethylene feed supply to ethylene de-oxo vessel.Earlier ethylene de-oxo bed was in bypass condition so does the preheater. Now we have take de-oxo bed and steam preheater in line. There is a steam inlet with temperature control valve on shell side...

Steam preheated is taken in line recently. Soon after this problem started.

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.

Thank u very much for your response.