On October 4, 1957 At that time I was 8 years old and I lived in a small village in the district of Aveiro in Portugal. I remember that at night, young and old people, with their eyes in the head, looking in the starry sky, with curiosity and some astonishment, a luminous point that moved in...
Because of pollution, Continental flights in the very near futur will be replaced by High Velocity trains, because trains are much less polluent and will compete more and more in velocity with planes. Intercontinental flight planes will keep going on making sense but, they have to change to a...
what is more poluente a diesel car or a gasoline car? will it be possible in the future to get ride of Nox and Co2 in the oil industry? just for discuss the same way what comes first the egg or the chiken?
luis marques
In Europe, refining margins are very small and in some cases negative. In principle this situation should-be attributed to:
An overproduction of oil products,
A slowdown in the economy with low market demand,
Technological advances in the automotive industry,
Appearance of electric...
We have two crude heaters furnaces of 15 meters high by 25 meters long. The crude unit has two heaters in parallel. In both heaters, on shock tubes, we experienced coil tubes bending, because of loss of tube supports. In one of the heaters, the top radiation coil, of the shock zone, which has...
It seems that sodium, magnesium and iron are responsible for the increase of the high turbo expander vibrations values, in a FCC power recovery unit, these variables are very difficult to control because they depend on feedstock and temperatures. The particles that leave the regenerator and the...
I would like to know from forum experience about some up dated inspection techniques to help us to estimate the remaining life of the reformer heater tubes. We have a heater 10 years old and we are going to have a shut down and we would like to prepare a NDT planning so that we can collect some...
For service temperatures above 850ºF (454ºC) type 321 and 347SS can sensitize. Some specs recommend furnace tubes (and other SS equipment that will operate above 850ºF (454ºC) be
thermally stabilized to prevent sensitization. Thermal stabilization consists of heating the entire piece of...
Most of the Naphtenic crude is believed to have the chemical formula R (CH2) nCOOH where R is a cyclopentane ring and n is typically greater than 12. The naphtenic crude corrosivity is not only dependent of TAN number. Some crude of high TAN is some times less corrosive than crude with low TAN...
Most of the Naphtenic crude is believed to have the chemical formula R (CH2) nCOOH where R is a cyclopentane ring and n is typically greater than 12. The naphtenic crude corrosivity is not only dependent of TAN number. Some crude of high TAN is some times less corrosive than crude with low TAN...
WHAT ARE THE MAIN FAILURES THAT HIGH PRESSURE BREECH LOCK TYPE HEAT EXCHANGERS MAY EXPERIENCE DURING MAINTENANCE AND HYDROTESTING?
TANNKS IN ADVANCE
LUIS MARQUES
Shall we PWHT SS TP 347H furnace tubes to be used in service of Hydrogen with partial pressure of 159 bar,H2S partial pressure of 1.4 x 10(-3)and vacuum gas oil?
PWHT heat up is 150/180ºC per hour, Four hour steep at 899ºC, and cool down at 150/180ºC per hour
THANK YOU
Lm
We have an exchanger shell plate A335 P12 15mm thick that was internally weld overlaid by flux wire process using a wire TP430.
After weld the clad deposition of TP 430, the dye penetrant inspection revealed that TP430 weld overlay was found with lots of pores and cracks.
What went wrong in...
At the moment I am in the commissioning team of a Hydro cracking construction. We are still in the engineering phase of the project but sooner we will start with on site field erection. As I am not familiar with Hydro crackers what is forum advice on inspection matters of this kind of units...
For duplex tubes 2505, O.D 25mm, in a highly corrosive environment with hydrogen and 6.2% wet H2S.
Pressure in 153.1 Barg, Pressure out 14 Barg
Temperature in 139ºC, Temperature out 60ºC
Velocity in 8.8m/s velocity out 7m/s.
Are BWG 16 tubes acceptable for an air cooler?
lm
After making 100% TOFD to the welds of a propane sphere there were detected liner discontinuities such as localized cracks in the welds link of the dome to shell buds at several deep thickness (plates thickness 40mm).
After this first inspection the defects were mechanically removed and the...
In our oil refinery, fired heaters internal convection bank supports which are not cooled are made of high alloy such as Cr50Ni50Nb.
For new convection supports we are being invited to use NiCr28W, because it is cheaper and because the supports supplier says that NiCr28W offers better behaviour...
