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"Giraffe Necking" is the term used to describe the appearance of a tube showing a number of uneven hotzones. It may occur for three main reasons. It may be an extreme type of the hot zone problem caused by extensive deactivation by catalyst poisoning or masking by a surface deposit. It may also be caused by channelling in the catalyst bed, where the gas passes preferentially through certain parts of the catalyst. When channelling occurs, the tube is cooled where gas is flowing and the reaction is occuring and overheats where the passage of gas is blocked. Channeling can be caused by packets of broken catalyst and dust or by accumulation of carbon. Lastly, especially in the case of old catalyst, giraffe necking may indicate that the catalyst is nearing the end of its active life and parts of it are falling below the minimum required activity and the catalyst requires charging.
What else can I help you with?
What is Ethylene Glycol Reactor catalyst?
the catalyst is used inside the reactor to activate the reaction of the ethylene and oxygen in order to produce ethylene oxide EO. those catalyst are small Wight balls fit inside the reactor tubes and by passing combined gases (oxygen, ethylene, nitrogen, and some other gases) they will react in a maintained temperature and pressure then form the EO. There are two types of catalyst: high selectivity catalyst low selectivity catalyst i wish that i answered the question & glad to answer any further question.
What is the difference between T12 and F12 fluorescent tubes and are they interchangeable?
T12 and F12 tubes have different diameters - T12 tubes are 1.5 inches in diameter while F12 tubes are 1 inch in diameter. They are not interchangeable because they have different fixtures and ballasts. T12 tubes are being phased out due to energy efficiency regulations.
Uterine tubes are also called what?
Fallopian tubes
What color coded test tubes are used in centrifuge?
Different laboratories may use different color codes for test tubes depending on their specific protocols. However, a common color coding for test tubes used in centrifuges is as follows: red for serum tubes, lavender for EDTA tubes, green for heparin tubes, and blue for citrate tubes.
What is the location for estachian tubes?
The eustachian tubes are the auditory tubes that link the nasopharynx to the middle ear.
What does bilateral patent tubes?
Bilaterally Patent tubes means both fallopian tubes that are unblocked and unobstructed
Is seamless tubes and seamless pipes are the same?
tubes means the little out diameter, pipes means the large diameter.
What does doubly ligated means?
It means that both tubes were cut.
What happens if you get pregnant and your tubes are tied?
If you are pregnant and your tubes are tied afterwords, you should be fine. but that means you can't get pregnant again.
What is bilateral sterilization?
Bilateral sterilization means both tubes (fallopian tubes or vasa deferens) were cut/tied/etc.
What does ligation mean?
It means that both tubes were cut.
Can dwarf hamster climb normal hamster tubes?
As they are dwarf hamsters they are not as big as Syrian or other hamsters. This means that they may not be able to go in the tubes but it depends on the size of the tubes. Hope i helped :) x
What is Mario and luigis job?
if you had the game... do you... anyways, if you have it you'd realize they go in and out of tubes so think tubes what do plumbers do with them... which isn't the subject... he goes in the tubes and out... which means he's a plumber... I hope I answered your question, Skip
What does a bilateral tubalectomy mean?
Broken down, bilateral means both sides of the body. Tubal means the part of the body in question and -ectomy means Removal of an anatomical structure. So It means the removal of the left and right tubes. This is different from a a tubal ligation where the tubes are "tied" for birth control.
Do you still ovulate with your tubes tied?
Nope cos it means that you cant get pregnant
What is the medical term for tightening of a bronchus?
Bronchoconstriction means constricted bronchial tubes.
What means contains tubes or vessels?
I think the term you're looking for is - vascular.
