The drain system design is based on segregated systems,
described below.
The Open Non-Hazardous Drainage System provide drainage for
locations that are designated non-hazardous. This system is segregated from all
other open or closed drain systems.
Non-hazardous areas generally include storage vessel areas
for utility materials such as lubricating oil, diesel fuel, etc. The drain
system from these areas, referred to as the Open Non-Hazardous
Drains (ONHD), handles fluids collected from open drip pans, tundishes and
floors in non-hazardous areas.
Discharge of the ONHD to the system shall be by open galleys
for the floor drains and a tundish type system for equipment maintenance
drains. The disposal stream is discharged into the API Separator 1 Skimmer. The
hydrocarbons settling out in the Separator / Skimmer will be pumped to burn pit
for final disposal.
The Open Hazardous Drainage System provides drainage for
areas that are designated hazardous. These generally include all process areas
and locations where hydrocarbons are present in significant quantities. The
drains system from these areas, referred to as the Open Hazardous Drains (OHD),
handles fluids collected from open drip pans, tundishes and floors in hazardous
areas. The open drain system must only be used for draining hydrocarbon fluids
from process vessels after preparation for maintenance (depressurization).
The OHD streams are collected and routed to the API Separator Skimmer by a separate channel.
Collected hydrocarbons are pumped to burn pit for final disposal.
Water from open drain system will be directed to the API separator / skimmer and then disposed to
the river. The design of the water handling system as minimum it will comprise:
·
API Separator / Skimmer
·
1 x oily water pump
The Closed Drain System (CD) consists of a permanent pipe
work connection and collection header for routing drained liquids to a vented
closed drain drum. It handles hazardous fluids from process vessels, keeping
them out of contact with the atmosphere.
The Closed Drain Drum is designed with sufficient volume to
receive the drained fluids and to permit vapor disengagement. A safety margin
is applied to cover additional volumes, which may be drained. A high level
alarm is installed to prevent overfilling. The drum shall have a minimum design
pressure of 100 psig (eliminating the risk of rupture in the event of a
deflagration). The vent is sized to discharge the highest vapor flow that could
enter the drum if gas blow by should occur.
The sizing requirement for the closed drain drum pumps is
the removal of all liquids between LLH and LLL
in 30 minutes to the API Separator/Skimmer.
Overview of drain system:
·
1 off - closed drain drum
·
2 off -100 % closed drain drum pumps &
motors
what is the cost of upgrading closed drain system in refinery with caopacity of 10,000
ReplyDelete12.3, possibly as much as 12.6. Hope this helps.
DeleteWhat precaution to be taken when mixing open and closed drain system? Please elaborate
ReplyDeleteBefore letting the open drain and closed drain to mix there is a better way to remove the hazardous substance first by heating and flotation process. After removing the hazardous substance it can be mixed with closed drain itself.
ReplyDeleteHow does ODS & CSD correlates with AOC & COC?
ReplyDelete*CDS
DeleteThanks for this great and useful information Ajet Engineering Pte Ltd specializes in oil skimmers, Oil Skimmer Separator & equipment for the general manufacturing, and commercial marine industries.
ReplyDeleteThanks for sharing this blog post. We, Pearl Bath is leading Floor Drain Suppliers from Delhi India.
ReplyDelete