Ovelap Backup Design
Ovelap Backup Design
(OP)
Hi All!
Recently I found a conceptual description of a Wastewater treatment plant where "Overlap Backup Design" is mentioned as a philosophy of design. From that philosophy it is proposed to install two parallel separation trains wich includes: coalescer, flotation unit and filter. Each train normally would receive fluids from different sources.
I really don't understand the exact meaning of that philosophy. I assume both trains operate simultaneously but (here my question):
a)Should the capacity of the equipments include a overdesign in order serve as backup for the other in case of maintainance? Thus keeping the process continuosly working.
b)Should I consider some adittional equipment to be a backup for both trains?
I thank you in advance for your help.
jeap
Recently I found a conceptual description of a Wastewater treatment plant where "Overlap Backup Design" is mentioned as a philosophy of design. From that philosophy it is proposed to install two parallel separation trains wich includes: coalescer, flotation unit and filter. Each train normally would receive fluids from different sources.
I really don't understand the exact meaning of that philosophy. I assume both trains operate simultaneously but (here my question):
a)Should the capacity of the equipments include a overdesign in order serve as backup for the other in case of maintainance? Thus keeping the process continuosly working.
b)Should I consider some adittional equipment to be a backup for both trains?
I thank you in advance for your help.
jeap





RE: Ovelap Backup Design
A lot of factories are at risk because of Single Points of Failure, e.g. one major piece of capital equipment through which all work flows. When that machine is down, you're out of business.
... and your competitor takes up the slack.
;---
It seems that wastewater is different, because it just keeps coming, and there's no competitor there to take up the slack when you go offline, so you can't afford to go offline.
It would therefore make sense to provide some kind of onsite backup. Logically, each should be sized to at least take care of the full normal flow somehow, to cover the case when one line is down. Which happens when any one unit is down.
The word 'overlap' suggests a relatively simple enhancement; providing cross- connects, normally closed, so that, e.g. coalescer A could feed flotation unit B, etc., so that the plant could run at full capacity even if two non- corresponding units are down. You've still got a problem if, e.g., both coalescers are down.
Mike Halloran
Pembroke Pines, FL, USA
RE: Ovelap Backup Design
RE: Ovelap Backup Design