Reduction of Oil Content in Degreasing Tank of Phosphating Process by Implementing Suitable Solution

DOI : 10.17577/IJERTCONV6IS04062

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Reduction of Oil Content in Degreasing Tank of Phosphating Process by Implementing Suitable Solution

J. Dixon Jim Joseph¹ S. Berlin²

¹Associate Professor ²Ug Scholar Department Ofmechanical Engineering,

Hindusthan Institute of Technology, Coimbatore 32

Abstract:- The main aim of this project is to enhance the Paint Adhesion Quality of ½,1/4,3/8 Bowl Guards which are to be fitted on Air Preparation Units like Pneumatic Filter & Lubricator after the painting process, by implementing adaptive solution.It is found that when the Bowl Guards undergoing Phosphating Process (Paint Pretreatment) a large sum of Free Floating Oil generated and floats on the top surface of Degreasing tank sticks on the bowl guard which relatively reduces the Paint Adhesion Quality. Hence the Free floating oil was removed efficiently by employed suitable oil removal equipment and finally Paint Adhesion Quality of Bowl Guard is improved.

Key words : Quality, Paintadhesion, Bowlguard, free floating oil, removal


Quality in its most simple terms may be defined as Conformance to requirements. A product is said to be good quality if it works well in equipment it was meant for. Quality is a relative term and is generally used with reference to the end use of the product[1]. Some of the most popular defenitions for quality are listed below,

  • A degree of excellence

  • Conformance to requirements

  • Totality of characteristics which act to satisfy a need

    The quality and life of paint applied on the material depends on various factors such that it should withstand the external factors like moisture,humidity etc.,It is necessary to give proper surface finish on the material prior to painting process which increases the quality of paint adhesion. This project deals with the improvement in painting quality of FRL units. It was found that the Bowl Guards of sizes ½,1/4,3/8 which are to be fitted on the Filter &Lubricator, facing some quality drawback after the Painting process. The main issue was reduction in the life of Paint Adhesion because of oil layer deposition on the bowl guard during Phosphating Process(Paint petreatment).Since the bowl guards are made of steel , rust prevention oil coating is applied on it. They are

    removed in the Degreasing Tank of Phosphating Process with the help of Industrial Degreasers.The removed oil forms a layer on the tank and sticks to the Bowl Guards while they moves to next stage of the process.

    Usually the oil layer was removed by manual process.A worker should collect the floating oil layer by means of any beaker

    ,vessel or any other means. The difficulties faced during the manual removing are,

    1. Oil layer can removed only at

      the commencement

      or after completion

      of Phosphating

      Process.Removing at

      middle is quite risky and may affect flow of the process.

    2. Unable to prevent oil deposition on the bowl guard while they moves to water tank from degreasing tank

    Bowl guard :

    The bowl guard is a material made of steel is fitted in Air preparation units like Air Filter & Lubricator.The major function of the bowl guard is that themoisture extracted from the compressed air will collect in the bowl[2].The bowl guard is fitted in

  • Pneumatic Filter

  • Pneumatic Lubricator

Pneumatic Filter:

The filter should receive the supply air first from the compressor. The filter will extract most moisture and air- line contaminants typically down to 5 microns, and can get as small as 0.3 microns depending on the type of filter selected[2].

PneumaticLubricator :

Most air tools, cylinders, valves, air motors, and other air driven equipment require lubrication to extend their useful life. A lubricator adds controlled quantities of oil into a compressed air system to reduce the friction of moving components. The use of an airline lubricator solves the problems of too much or too little lubrication that arise

with conventional lubrication methods such as a grease gun or oil[2].

Fig:1 Bowl guard

Fig:2Pneumatic Filter

Fig:3Pneumatic Lubricator


  1. Chemical Experiment to find Dissolved oil in the degreasing tank

    Take 100 ml bath solution in 300 ml capacity separating funnel and cool down to ambient temperature.acidify the solution with 1: 1 sulphuric acid to pH 3-

    3.5 and cool down the solution to ambient

    temperature.Add approximately 100 ml of diethyl ether to the solution and shake well and allow separating two layers. The lower layer is the degreasing solution and the upper layer is diethyl ether plus dissolved oil .Discard the lower layer and collect the lower layer in pre weighted 100ml beaker and on slow heating hot plate evoparate and reweigh the beaker.

    Dissolved oil (gm/l) = [ wgt of the beaker after evaporation wgt of the empty beaker ] x 1000

    Final weight of the beaker [Wb]

    = 102.5 gm

    Dissolved oil [gm/lit]

    = [Wb-Wa]*1000

    = [102.5-99.5]*1000

    = 3 gm/lit

  2. Manual method to find amount of oil applied on the individual bowl guard :

In the manual process about 10 bowl guards of each sizes are taken.Weight is noted initially and dipped into thinner for few minutes.Then it is thoroughly cleaned and weight is noted.The process is repeated for all the 10 bowl guards of each sizes.The average of both initial and final weight is calculated and its difference gives the oil present in each of its surface .

  1. For 1/2 bowl guard

    =Actual mean weight Final mean weight

    = 151.56 151.55 = 0.01gm

  2. For ¼ bowl guard

    = Actual mean weight Final mean weight

    = 58.4348 58.3755

    = 0.0593gm

    Sample collected= 100 ml of degreasing solution Initial wight of the 250ml beaker [Wa] =


    For3/8 bowl guard

    = Actual mean weight Final mean weight= 92.1964 92.1910

    = 0.0054 gm

  3. Total oil removal equipments/techniques available around the world

  1. Tramp oil separator

  2. Oil absorbing pillow

  3. Grannular activated carbon

  4. Organoclay

  5. EDGETECH Coolant recovery system

  6. Biological treatment

  7. Polypropylene pads

  8. Oleophilic foam

  9. Floating weir skimmer 10.Belt skimmer

11.Oil absorbing polymer 12.Dissolved air flotation 13.Disc skimmer

14.Gravity oil water separator

  1. Choosing equipment suitable for degreasing tank and validate its performance :

    Oil skimmers are pieces of equipment that remove oil floating on the surface of a fluid. These generally work because they are made of materials to which oil is more likely to stick than the fluid it is floating on. At the same time, the fluid has very little attraction to the equipment. Oil skimmers are usually all that is necessary to remove oil from a liquid. In some cases, however, they may be used to pre-treat a fluid. In this case, they remove as much of the oil as possible before more expensive and time-consuming measures are employed.


    Belt-type oil skimmers use an endless belt of corrosion resistant steel or synthetic medium, which is lowered into the tank or vessel to be skimmed. The belt passes through resilient wiper blades where the oil is removed from both sides of the medium.


    The oil skimmer consists of an basic mechanism that produces an rotating movement from continuouly rotary input. It mainly consist of electric motor whose output shaft is directly coupled to the disc which is made up of acrylic material .The oil and water mixture is filled into the steel container and theoil skimmer assembly is kept into the tank. As when the acrylic disk rotates it creates the adhesion force between oil and disk surface so that the oil will stick to the disk and finally oil will removed from disk

    with the help of scrubber and it is collected in other tank.

    Fig : 6 Back view

    Performance measure :

    After proper installation of skimmer on the degreasing tank,it is operated and its rate of oil collection capacity is estimated. The skimmer is operated for 4 days with variable time duration for each day. Also it is operated both during the conveyor under running condition and at standby.

    TRAIL 1 :

    Running time


    4 Hrs

    Oil Collected


    8 ml

    TRAIL 2 :

    Running time


    12 Hrs

    Oil Collected


    50 ml

    TRAIL 3 :

    Running time


    24 Hrs

    Oil Collected


    100 ml

    Fig : 7 Collected oil


    • Reduce your cost of purchasing new coolant by 45% to 75%

    • Cut your cost of coolant disposal 50% to 90%

    • Improve tool life and product quality

Fig : 8 Collected oil

  • Safeguard worker health & safety

  • Minimal operator involvement and training

  • Designed for easy installation


The main purpose of project to remove the waste oil from Degreasing Tank of Phosphating Conveyor. The project is important for increase the paint adhesion quality of bowl guard which is to be fitted on FRL unit .

So the recovery of spilled oil is very necessary. This project is oil skimmer which is one of the method of regaining the oil which is spilled. After designing our project and testing it we have concluded that we can regain about more than 90% by using oil skimmer


  1. Quality – Wikipedia

  2. Andrew parr,Hydraulics & Pneumatics

  3. International Tanker Owners Pollution Federation Limited (ITPOF), Country Profiles: Use of Sorbent Materials in Oil Spill Response, Impact PR & Design limited, 2012.

  4. ASTM, D400781: Standard test method for water and sediment in crude oil by the centrifuge method, in: Annua book of American society for testing and materials standards. ASTM committee on standards, West Conshohocken, PA, 1998.

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