Q and A
Q & A
> Question Details
In our DHDT unit (Axens licensor) one PV is given after the feed filter package to maintain a back pressure of 5kg/cm2. What is its importance?
In the other DHDT unit (Haldor Topsoe) there is no PV given.
Jake Gotham, InSite Technical Services, firstname.lastname@example.org
Without seeing your drawings it would be difficult to know for sure why the valve is there, but…
My first guess is that the Axens unit has backwashed filters that use filtered feed to flush the fouled filters. The backpressure is necessary to drive the backwash flow through the fouled filter and away to slop.
My next guess is that the Haldor Topsoe unit either has cartridge filters (no backwash required) or uses a different fluid for backwash (e.g. product rundown) or operates with the feed drum at high enough pressure to drive the backwash.
Browse our refining and petrochemical technology Q&A
Don't wait for the mail. Download the current edition of PTQ in digital format free-of-charge right now.
Renew your registration, update your details or register to receive the print edition of PTQ
Download the PTQ Media Details for 2021
Media Details for 2021
Terms and Conditions
Protecting Your Data