existing shell nozzle enlargement
existing shell nozzle enlargement
(OP)
Hello dear engineers.
we have an inlet shell nozzle of 16" dia. on shell of a 40,000,000 liter steel storage tank. now the operation of tank is redifined to kerosene equilibrium transmittance and a larger inlet is needed, you suppose 20" dia. if we have permission to enlarge the diameter directly by cutting tools? what happens to waste stress? is a reinforcing plate necessary? what are the conditions and the procedure of this diameter increase?
thank you for your remark.
we have an inlet shell nozzle of 16" dia. on shell of a 40,000,000 liter steel storage tank. now the operation of tank is redifined to kerosene equilibrium transmittance and a larger inlet is needed, you suppose 20" dia. if we have permission to enlarge the diameter directly by cutting tools? what happens to waste stress? is a reinforcing plate necessary? what are the conditions and the procedure of this diameter increase?
thank you for your remark.





RE: existing shell nozzle enlargement
If the tank is an API-650 tank, refer to API-650 and API-653 for acceptable repair and modification procedures.
In particular, watch for requirements for stress-relief and weld spacing.
RE: existing shell nozzle enlargement
If the centerline elevation is at least API low height for a 20" nozzle ( 20.75" ) You can arc off the repad, cut out the 16" nozzle, then install a new 20" nozzle with a new repad in its place. Note however if the shell is over 1/2" thick and does not meet current design metal toughness then a shell insert plate or thickened insert plate will be needed. The installation of a 20" nozzle will normally trigger a hydrotest.
RE: existing shell nozzle enlargement
RE: existing shell nozzle enlargement
If you're worried about entry velocity then add a reducer on the inside as well back to 20" or 24" say, but for a 40,000 m3 tank I don't think that is a big concern.
If you need to then yes, use two nozzles.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: existing shell nozzle enlargement
sincerely yours.
Ali Mottalea.
IOPTC.
RE: existing shell nozzle enlargement
errrr, can you explain a little more exactly what you mean??
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: existing shell nozzle enlargement
RE: existing shell nozzle enlargement
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: existing shell nozzle enlargement
RE: existing shell nozzle enlargement
Under API 650, these do not exist. Nozzle repad size & other dims are in a table, precalculated [& approved] a long time ago. Table 5-12 for Flush, and Table 5-8 for conventional nozzles.