12/5/14

OPEN AND CLOSED DRAINS SYSTEM

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:
The Closed Drain System shall be designed to receive and degas the maximum expected production of raw condensate and oil from the various sources, and will consist of:
·         1 off - closed drain drum
·         2 off -100 % closed drain drum pumps & motors

10 comments:

  1. what is the cost of upgrading closed drain system in refinery with caopacity of 10,000

    ReplyDelete
    Replies
    1. Anonymous3/20/2019

      12.3, possibly as much as 12.6. Hope this helps.

      Delete
  2. What precaution to be taken when mixing open and closed drain system? Please elaborate

    ReplyDelete
  3. Before 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.

    ReplyDelete
  4. How does ODS & CSD correlates with AOC & COC?

    ReplyDelete
  5. Thanks 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.

    ReplyDelete
  6. Anonymous4/11/2023

    Thanks for sharing this blog post. We, Pearl Bath is leading Floor Drain Suppliers from Delhi India.

    ReplyDelete
  7. Nice blog, thanks for sharing Oil Skimmer

    ReplyDelete
  8. This is a very informative article on open and closed drain systems in petroleum plants. I am curious, how do these closed drain systems compare to sewer systems typically found in residential areas? Are there aspects of the closed drain system design that could be applicable to sewer systems?

    ReplyDelete

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