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I need all the help I can get here. There is a sudden increase in water in our distillation operation. We checked for Cooling Water chemicals in the process (Cloride) for prossible ingress from the CW condenser but found none. This suggest that the water may be ingressed from the steam reboiler...

All, I am putting in a RD to protect a PD pump. The RD is installed at the discharge line and routed back to the suction line. In case of overpressure, flow will be diverted back to the suction side. My question is, how to decontaminated this line for maintenance (case: RD does not burst but...

Some cement kiln operator, knowing how advantageous this is to the refinery will instead charge the refiner for every tons of they send in!

All, I need you opinion on this one. I'm HAZOPing a PD pump set-up. For the pump block-in condition (discharge valve close), is it sufficient to depend on the pump's internal relief valve or must we install a PSV upstream of the discharge valve with its outlet being recirculated into the suction...

Thank you all for being all the comments. Its has been very helpful.

All, In designing a piping system with variable pressure rating, what is the consideration when specifying the piping spec break? Must there be a valve at every spec break? Is there any code on this? Thanks

Ommuruga, You need to be more specific on the system to be commissionned. Different system have different requirement. Cryogenic system require moisture freeing. This is achived by purging the system with nitrogen until the dew point reading at the outlet points are the same as in the nitrogen...

One of the major concern for Turnaround scheduling is the late issuance of Work Permit. Someday, esp during the beginning of the Turnaround, some work can only begin after 10:00 in the AM (Normal shift started at 7:00 AM). One way suggested is to lengthen the validity of selected non critical...

Thanks for the response so far. The damaged trays are located at the bottom. All three bottom-most tray of the Stripping section. The reason it is made of exotic material is due to the high corrosivity of the process fluid at that high temperature. The most likely reason for the damage is like...

Dear all, I am having a shutdown maintenance. Just open a distillation column and found three trays are damaged. Due to the exotic material, we only have one tray for replacement. To order new will take months. The total number of trays in the column is 50. If we run the column with two missing...

Dear all, There are two types of steam flow control into a thermosyphon reboiler. One is by having the control valve at the steam inlet line and the other is controlling the exchanger condensate outlet flow. Based on your experience, which one is more realiable and robust? Appreciate any comments

Dear all, Is there any step-by-step method for checking pump capacity? I am looking into increasing a flow across a system. The volumetric flow is o.k with the pump but the density has increased. How do I translate this change into the pump curve? Appreciate any ideas

Experiencing fouling at the tube side (Cooling Water) of a heat exchanger. The HX is of straight tubes with a longitudal baffle at the channel cover to allow for two passes design (TEMA type: BEP). Cooling water enters thru the bottom nozzle of the channel cover, flow thru the tubes and return...

Experiencing fouling at the tube side (Cooling Water) of a heat exchanger. The HX is of straight tubes with a longitudal baffle at the channel cover to allow for two passes design (TEMA type: BEP). Cooling water enters thru the bottom nozzle of the channel cover, flow thru the tubes and return...

Whenever there's hydrocarbon vapor release from our flare stack, the atomizing steam valve will be opened to ensure complete combustion therefore reduce black smoke formation. One persistent problem: with the steam discharge, come a defeaning noise (at 110 dBA monitored at grade level). Happy to...

Further question to the group. I'm planning to do a steam blowing. Two set-up are being proposed: 1. To locate the sacrifical valve at the upstream side of the new steam piping, close to the steam source. Steam flow can be monitored from the supply header. Sacrifical valve is opened until...

Hi Zaheer, Try radar level sensor. We are using it for corrosive service. Great stuff.

As we have two chiller units (one standby), my options are: A. Run the chiller in series or, B. Run the chiller in parallel or, C. Install a rental unit downstream of the exisitng. Option A requires extensive piping modification, Option B may cause insufficient flow (i.e. laminar) thru the...

My update based on the above replies: -The vacuum pump is working well. It gives the negative pressure as per design specification. -The chiller is very sensitive towards CW temperature. Even if the temp increases by 1 degC, we will lose the Solution level in the evaporation drums. -Temperature...

What is the best way to determine the vibration of tubes in a shell and tube exchanger. Is just monitoring vibration on the shell external wall gives a valid data? What is the normal vibration figure and the max allowable. If you guys have any experience in this, appreciate any sharing of ideas...