Hi all,
In a project we are dealing with, our client wants to eliminate the fire water tank from a future natural gas compressor station. They are planning to use the existing gas plant fire water tank, located 900 meters away and 20 meters below the compressor station grade. A new 14" pipe is...
I´m designing the regeneration gas aircooler of an NGL plant.
API 661 ask for methods of restraint relief for multipass bundles with temp. difference larger than 200°F, which is the case of this equipment.
I have tried multipass bundles (4 to 6 passes) with different tube pass configurations as...
We are designing a large NGL plant and for regeneration gas heater our first choice is to use a coil in WHRU using turbine exhaust.
4 turbocompressors will be installed for residue gas, all with WHRU. One coil for regen gas should be installed in each WHRU to allow regeneration if any compressor...
I would like to understand required connection of a remote rack and a remote compressor control panels to a HC900 controller.
The rack and the control panel are for new equipment to be installed and the HC900 is existing.
Signal from the remote rack goes to a remote ethernet switch, then to a...
We are planning a revamp of a gas plant and when checking the refrigeration system velocities in compressor suction scrubber are exceeded, then liquid carryover may be expected.
What could be the consequences of excessive propane carryover to the compressor?
Thanks,
Have you ever seen the suction of a standby pump being pressurized up to the discharge pressure of the running pump?
Could this happen if the standby suction line is closed and its discharge line open, regardless of the check valve presence?
In this case rating of suction side instruments (low...
Tipically I have seen low flow switches installed in pumps suction lines.
Is there any restriction for installing low flow switches in the discharge lines?
The only disadvantages I can see of installing these flows in discharge lines are the increased pressure rating of the instrument and...
Can anyone give references about the usage of twisted tube heat exchangers in crude preheat trains, specially with HGO, HVGO, atmospheric tower bottoms, or vacuum residue as the heating media?
Thanks
We have a pair of crude oil centrifugal pumps (680 m3/h - 3000 gpm) with large discharge head (192 m - 630ft )that need to be reused. They will be speed controlled by means of a VFD. Minimum flow is 1/3 of rated flow.
Spillback is not desired as return to suction vessel is impractical (vessel...
I have to protect the tubeside of a heat exchanger for tubeside thermal expansion scenario. Tubeside fluid is crude at 400ºF and shellside fluid is atm. tower bottoms at 590ºF.
PSV set pressure is 425 psig and at that pressure saturation temperature is 565ºF.
Do I need to calculate the PSV to...
I have some doubts regarding flashing control valve CV sizing. Available software indicate flashing service but they don´t take into acccount downstream vapour fraction.
I´ve seen manual procedures for sizing flashing liquid valves where separate CV´s are calculated for both flashed liquid and...
Hi,
I´m working in a crude unit refluxed preflash column installation project to reduce heater firing and extend unit run lengths.
The column was installed in another crude unit but is now non-operative due to foaming problems and black distillates products.
Our client requires the installation...
I´m working in a FCC fractionation unit revamp and the main problem is the amount of LCO in bottom slurry.
According to simulation the efficiency of this zone is very poor and would be responsible for this situation.
Currently the desuperheating zone has 6 rows of sheds and we believe that...
I´m working in a FCC fractionation unit revamp and the main problem is the amount of LCO in bottom slurry.
According to simulation the efficiency of this zone is very poor and would be responsible for this situation.
Currently the desuperheating zone has 6 rows of sheds and we believe that...
Hello,
I need another point of view to this well discussed subject.
When depressurisation takes place in a vessel, developed temperature inside the vessel can be very low due to a nearly isentropic expansion.
Is this theory also valid for more complex system consisting of piping and several...
Which is the minimum gas velocity required in natural gas exchangers (gas-gas/chiller) to provide adequate glycol distribution and good hydrate inhibition?
Is it velocity the correct parameter or others may be used
(e.g. ro.v2)?
Thanks
I´m designing a couple of indirect type oil heaters to API 12K and I have some questions about firetube design.
Firetube heat density is defined as the Firetube rating divided by Cross Sectional Area and Efficiency.
Is not clear to me which efficiency API is referring to.
Burner efficiency...
Blowdown from a cooling tower must be pumped to a 600 psig water pipeline.
Is there any disadvantage in locating blowdown (and pump suction) in the tower basin instead of placing it downstream of recirculating pumps?
It would be located opposite of make-up water inlet to avoid pumping fresh water.
In a crude preheat train a valve is controlling desalter pressure by means of throttling pump discharge.
PSV´s exist both in pump discharge (downstream of control valve)and in the desalter.
When a block of this train occurs upstream of the desalter, the PSV in the pump discharge will relieve...
I´m checking PSV capacities for atmospheric crude distillation.
I have some doubts about some scenarios.
1- When reflux pump fails reflux is lost and no liquid enters on top. Pumparounds do still have liquid to run? If so, it will diminish the effect of lost reflux, won´t it?
2- Is it...
