AlLucally aly sal} CHASM Gay ga AS i ‘ay al reviewed. EataplA eM FOR PETROLEUM SERVICES AND MAINTENANCE PICKLING & PASSIVATION PROCEDURE OF STAINLESS STEEL EQUIPMENTS ress : 4 Sharaawy ST, Floor fan- Alexandria Assan B hades =) Tel : (+2) 035820403 - Fax : (+2) 035861352 03-5861352 : sh 03-5820403 29h1.0 SCOPE 2.0 OBJECTIVE 3.0 REFERENCE 4.0 WORK INSTRUCTION 5.0 SAFETY INSTRUCTIONS 6.0 RECORDS ess : 4 Sharaawy ST, Floor 4 -Lor: = asi Bll aail— gala EAE Tel : (#2) 035820403 - Fax : (+2) 035861352 03-5861352: sh 03-5820403 zsally aly fall Glas Gaga AS 1.0 SCOPE: This work instruction defines the method of carrying out the pickling & passivation of stainless-steel equipment's. 2.0. OBIE! For acid cleaning & neutralizing SS material/weld joints meant during fabrication of vessels. This covers the surface treatment of austenitic stainless steel. The basic purpose of this chemical treatment is to remove films of oxide, scale, tampering colures & remnants of welding slag which are formed during annealing of welding. 3.0_REFERENCE: ASTM A380 4,0 _WORK INSTRUCTION: 4.1 Pre-treatment: Surface should be cleaned with brushing or grinding to remove weldspatter & smooth out scratches & should be degreased to remove oil & grease films. ress : 4 Sharaawy ST, Floor 4 -Loran- Alexandria HyjSe- lag GN gill gah aS EASE: Slyad Tel : (+2) 035820403 - Fax : (+2) 035861352 03-5861352: us 035820403 zc sisiASluaall y daly sill Lead AS i | One of the possible Pickled methods is described here. Aqueous Pickling solution shall be as following: -Nitric acid (Tech grade)-10to25% plus Hydrofluoric acid-1t08%(to be used only for stabilized SS grades).Temperature 50to60 C for 10% Nitric acid and 20 C for 25% Nitric acid.when size and shape of product permit, total immersion in the pickling solution is preferred. Where immersion i impractical, pickling may be accomplished by wetting the surface by: 1, Swabbing or spraying 2. Partial filling the item with pickling solution and rotating or rocking so that the entire surfaces receive the required chemical treatment. -The maximum period for which the pickling solution sall be allowed to remain on the surface is 30 minute. During pickling removal of oxides may be hastened by brushing with a hard fiber or SS wire brush. Over pickling shall be avoided. -The pickling agent sall be washed off with plenty of water so as to leave no trace behind. pickling and passivating agents All SS material shall be Pickled&Passivated as Per following Procedures: - Bath pickling is done by dipping parts in a pickling bath. It is used for pickling components of different shapes and sizes; limitations include the tank size and handling equipment capacity, and sometimes the shape of a component. Bath pickling is done using ANTOX 80 E. -Paste pickling is done by applying pickling paste with a brush. It is suitable for pickling welds and small parts. ANTOX 71 E and ANTOX 71 £ EXTRA pastes are used for this method; ANTOX 3d is used for pickling polished components. -Spray pickling is done by spraying a part with pickling gel, using either a special application device or a simple bottle with a pump (see figure 2). This method is usedfor vast areas. A colored indicator can be added to a pickling agent in order to make it easier to distinguish the sprayed area from the unsprayed area. ANTOX 73 E, ANTOX73 E PLUS, and ANTOX 73 E EXTRA gels are intended for spray pickling. ress : 4 Sharaawy ST, Floor 4 -Loran- Alexandria SAN = GLyal— Ql ssa glad G8 ts Olga Tel : (+2) 035820403 - Fax : (+2) 035861352 03-5861352 : sid 03-582040®SRAS ‘mol stainiesssteei parts canbe ettectvelypellee with brush-on get Sharaawy ST, Floor 4 -Loran- Alexandria sal) ‘el: (+2) 098820409 - Fan: (+2) 035861352 Last wt» ar ossseiss2 oc “os: 5820403 :< 9hASwuallg Aug sill GLesdU Guy ga AS i Spray pi This process offers ‘sévamage of on-site execution but necessitates appropiate ac disposal and safety procedures ress : 4 Sharaawy ST, Floor 4 -Loran- Alexandria Wypsud- Oly GUM gll= gal aS EAC: olga Tel : (+2) 035820403 - Fax : (+2) 035861352 03-5861352: sd 03-5820403 scsi4.2.1 ANTOX a pickling and passivation products (in Paste / spray / liquid form) approved under ASTM A380 for pickling and passivation of Stainless Steels shall be used for this purpose, 4.2.2 The surface to be pickled and passivated shall be cleaned thoroughly and made free from grease and oils. 4.2.3 ANTOX pickling paste is to be applied on the weld seam and the surrounding area with a brush. If the surface area to be cleaned is large then ANTOX pickling spray is to be sprayed on the surface to be cleaned with a spray pump or a pressurized plastic spray bottle. 4.2.4 After applying ANTOX (paste / spray) leave it on the surface to be cleaned for approx.30 mins. ss: 4 Sharaawy ST, el: (+2) 035820403 - Fay Loran- Alexandria 2) 035861352 Pols (03-5820403 = sisAalmally dally Si) LAS Gu pga AS i aX. = Re fie at A a @ 4.2.5 Wash the surface thoroughly with water. pickling can be 4.2.6 As an alternative to points no. 4.2.1 to 4.2.5 above, n shall be used: carried out byswabbing for which freshly prepared solutio! Solution: a) Nitric Acid (HNO3) - 20 parts by volume b) Hydro fluoric Acid (HF) - 3 parts by volume ©) Water - 77 parts by volume. 43 Passivation -One of the passivation pickling methods is described here. -After pickling and water rinsing, weight% and KMnOq Aweight% sI water rinsing, “Water used for pickling and washing shall not have chloride contents exceeding 30 ppm. an aqueous caustic permanganate solution containing NaOH 10 hall be used for neutralizing solution.this sallbe followed by thorough N= LB Gt gall gal ak gL t 03-5861352: sl” 03-582040: 's : 4 Sharaawy ST, Floor 4 -Loran- Alexandria (+2) 035820403 - Fax : (+2) 035861352Allwaall 9 duly ial) CaLesdl Guy ga AS pai 5.1 Surface treatment only to be performed by properly trained & experienced personnel while observing the safety regulations such as usage of gloves, masks & goggles while performing the operation. 5.2 Proper care shall be taken while handling this solution and direct contact to the skin of the operator shall be avoided. In case if it happens, the portion of skin shall be cleaned with sufficient quantity of cold water. 5.3 Pickling agents contain nitric acid (HNO3) and hydrofluoric acid (HF). That is why they are classified as caustic substances and poisons. Staff must be instructed in HS rules and regulation. Special protective aids need to be used. A face shield, rubber overallsand gloves are sufficient for paste pickling. When spray or bath pickling is to be done, workers need to use a face mask with a filter protecting against acidic vapors and a coveralll rubber suit, Pickling and passivation waste water is acidic and contains dissolved metals form the base material. That is why it must be collected and disposed of in an environmentally- friendly way. 6.0 RECORDS: 6.1 Stage Inspection Report. ess : 4 Sharaawy ST, Floor 4 -Loran- Alexandria FAN Lisl Qh yyall— glad Elk: olga Tel : (+2) 035820403 - Fax : (+2) 036861352 03-5861352 : Sb 03-5820403 :c9kt