GB2218920A - Liquid separator - Google Patents

Liquid separator Download PDF

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Publication number
GB2218920A
GB2218920A GB8812811A GB8812811A GB2218920A GB 2218920 A GB2218920 A GB 2218920A GB 8812811 A GB8812811 A GB 8812811A GB 8812811 A GB8812811 A GB 8812811A GB 2218920 A GB2218920 A GB 2218920A
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GB
United Kingdom
Prior art keywords
interceptor
chamber
coalescing filter
filter
former
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB8812811A
Other versions
GB8812811D0 (en
GB2218920B (en
Inventor
William Anthony Carr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB8812811A priority Critical patent/GB2218920B/en
Publication of GB8812811D0 publication Critical patent/GB8812811D0/en
Publication of GB2218920A publication Critical patent/GB2218920A/en
Application granted granted Critical
Publication of GB2218920B publication Critical patent/GB2218920B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D17/00Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02Separation of non-miscible liquids
    • B01D17/04Breaking emulsions
    • B01D17/045Breaking emulsions with coalescers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D17/00Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02Separation of non-miscible liquids
    • B01D17/0208Separation of non-miscible liquids by sedimentation

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

A separator to remove petrol from drainage water comprises a cylindrical setting chamber having a tangential inlet 5, 10 below the liquid level and a centrally located removable and tubular coalescing filter 6. Liquid flows inwards through the filter wall and via space 7 to an outlet duct 4, incorporated in the outer support of the filter, and thence to outlet 11. <IMAGE>

Description

LAMINAR FLOW COALESCING FILTER INTERCEPTOR This invention relates to a laminar flow, oil and petrol/water interceptor with coalescing filter.
There are two main types of petrol/oil interceptors currently in use on garage forecourts, carparks and industrial premises: A. Full retention 2 or 3 chamber interceptors with dippipes or slots between the chambers.
B. Bypass interceptors where 10% or 20% of the flow is passed through the interceptor chamber and the remainder is passed straight to the outlet pipe.
Both types of interceptor will generally separate the oil and petrol put down to a level of approximately 100 mg/l under general conditions. But no manufacturer is able or prepared to guarantee this level of separation.
The main problem with full retention interceptors is the re-entrainment of separated hydrocarbons during high(storm) flows.
The Bypass interceptor prevents re-entrainment during storm conditions, but it achieves this objective by passing the storm water together with any pollutants straight through the interceptor to the outlet drain.
Thus, both types are liable to allow pollution to occur.
The Laminar Flow, Coalescing Filter Interceptor however, will give dramatically improved levels of oil/water separation.
According to the present invention there is provided a vertical cylinder with the inlet pipe entering the tank via a flow guiding and suppressing chamber which releases the inflow tangentially to the main cylindrical chamber and below the normal liquid level with a coalescing filter mounted on a removable former positioned in the centre of the main chamber.
The outlet pipe is attached to a duct on the side of the outer filter former, which conducts the outflow from the base of the inner filter chamber after the flow has passed through the coalescing filter.
A specific embodiment of the invention will now be described with reference to the accompanying drawings in which figure 1 shows the interceptor with the filter and former in position and figure 2 shows the filter and former removed from the interceptor.
The interceptor comprises an inlet flow guiding and suppression chamber(1) with the inlet pipe(10) attached.
The inlet chamber(l) is attached to the main interceptor chamber(2) and ensures that the incoming flow is directed tangentially to the main cylindrical chamber(2) through orifice(5) which is well below the surface level of the liquid.
In the centre of the main chamber(2) is a vertical cylindrical former(13) with clear holes covering a minimum of 50% of it's area thus allowing free passage of liquid through the outer former(13) to the filter material(6).
The coalescing filter(6) is attached to an inner former which is cylindrical in shape except for one portion of it's circumference where a chord to the circle forms an outlet duct(4) to which the outlet pipe(11) is attached.
At the base of the coalescing filter(6) is the outlet collection chamber (7) which is connected to both the area inside the filter(6)(via holes(9)) and to the outlet duct(4). At the top of the main chamber(2) is an access turret(13) with a socket connection(12) for a separate vent pipe.
The Laminar Flow, Coalescing Filter Interceptor will operate in the following manner: Water and hydrocarbons will enter the inlet flow guiding and suppression chamber(1) where the flow will be directed tangentially to the main cylindrical chamber(2) and approximately midway between the liquid surface and the base of the chamber. In this way a smooth laminar flow is induced which encourages the droplets of oil and petrol to separate out from the water and rise to the surface of the chamber.
In order to pass out of the interceptor, all of the flow must pass through the coalescing filter(6). Very small droplets of oil and petrol do not rise to the surface fast enough to be separated out in the normal timespan allowed in a conventional interceptor, the coalescing filter(6), however, causes these small droplets to join together and form droplets which are large enough to rise to the surface of the chamber.
After the flow has passed through the coalescing filter, the liquid is drawn out from the base of the centre of the inner chamber(3) into the outlet collection chamber(7) then into the outlet duct(4) and then out of the interceptor through the outlet pipe(11).
The base of the inner chamber(3) together with the coalescing filter(6) and the inner former(14) are removable for cleaning or replacement.

Claims (7)

1. An oil petrol interceptor comprising a vertical cylinder with the inlet pipe entering the tank via a flow guiding and suppressing chamber which releases the inflow tangentially to the main cylindrical chamber and below the normal liquid level with a coalescing filter mounted on a removable former positioned in the centre of the main chamber.
2. An interceptor with a coalescing filter mounted such that all the outflow must pass through it.
3. An interceptor with a coalescing filter mounted so as to be removable from the chamber for cleaning or replacement.
4. An interceptor with a coalescing filter mounted on a former.
5. An interceptor as claimed in claim 1 wherein the outlet pipe is attached to a duct on the side of the outer filter former, which conducts the outflow from the base of the inner filter chamber after the flow has passed through the coalescing filter.
6. An interceptor as claimed in claim 1 wherein the coalescing filter is a near-vertical tube, positioned close to the centre of the main interceptor chamber.
7. An interceptor substantially as described herein and with reference to the accompanying drawings (figs 1 & )
GB8812811A 1988-05-28 1988-05-28 Laminar flow coalescing filter inteceptor Expired - Lifetime GB2218920B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8812811A GB2218920B (en) 1988-05-28 1988-05-28 Laminar flow coalescing filter inteceptor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8812811A GB2218920B (en) 1988-05-28 1988-05-28 Laminar flow coalescing filter inteceptor

Publications (3)

Publication Number Publication Date
GB8812811D0 GB8812811D0 (en) 1988-06-29
GB2218920A true GB2218920A (en) 1989-11-29
GB2218920B GB2218920B (en) 1991-10-23

Family

ID=10637809

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8812811A Expired - Lifetime GB2218920B (en) 1988-05-28 1988-05-28 Laminar flow coalescing filter inteceptor

Country Status (1)

Country Link
GB (1) GB2218920B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB537498A (en) * 1939-12-21 1941-06-25 Colin John Gray Improvements in or relating to the filtration of liquids
GB583584A (en) * 1944-03-01 1946-12-20 Archibald Lawson Improvements in liquid separator apparatus
GB589720A (en) * 1944-07-13 1947-06-27 Archibald Lawson Improvements in liquid separator apparatus
GB1284633A (en) * 1969-06-02 1972-08-09 Amf Inc Removal of oil from water

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2217621B (en) * 1988-04-26 1991-11-27 William Anthony Carr Laminar flow grease trap

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB537498A (en) * 1939-12-21 1941-06-25 Colin John Gray Improvements in or relating to the filtration of liquids
GB583584A (en) * 1944-03-01 1946-12-20 Archibald Lawson Improvements in liquid separator apparatus
GB589720A (en) * 1944-07-13 1947-06-27 Archibald Lawson Improvements in liquid separator apparatus
GB1284633A (en) * 1969-06-02 1972-08-09 Amf Inc Removal of oil from water

Also Published As

Publication number Publication date
GB8812811D0 (en) 1988-06-29
GB2218920B (en) 1991-10-23

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950528