FORD B2BBX-1991 ONE-STEP PAINT LINE CLEANING PROCEDURE《单步式漆线清洁程序》.pdf

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1、B2BBX ONE-STEPPAINT LINE CLEANING PROCEDURE SEPTEMBER, 1991 BZBBX Page 1 1. SCOPE: circulation-to-the-gun (pressure differential or branch line) paint circulating system. This method is recommended for systems that: This standard defines a cleaning and maintenance procedure for a Have not been clean

2、ed for 3-5 years. Require a paint change involving incompatible materials such as a conversion from a solvent base to a water base paint or coatings with different types of resin systems. Experience a significant decrease in flov rate. Require frequent adjustments to reset either the return back pre

3、ssure valve to the supply line bypass valve to maintain desired flow rates. (Investigation should determine that this condition is not attributable to faulty valves, worn pumps, improper fluid viscosity, etc.). 1.1 Circulation period in each system will depend on the type of paints, nature and amoun

4、t of buildup in the lines and time since last cleaning. Do not short cut on time required to do an effective job. 2. MATERIALS: 2.1 DESCRIPTION: M99B18U(F) systems prior to the use of non-chlorinated cleaning solvent M99B180A(F) Material to be used to pre-clean paint circulating M99B180A(F) lating s

5、ystems. Non-chlorinated stripping solvent for paint circu- 2.2 REUSE: The Pre-clean M99B18U(F) could be cycled twica: First as flushing agent after H99Bl8OA(F) Second as flushing agent before H99B180A(F) On the next color, reuse of flushing materials must be confined to similar colors and/or solid/m

6、etallic colors. Do not use M99B180A(F) more than tvice. Procure enough clear resin for two to three systems or color 1ir.c fills. Material is reusable. 3. CAUTION - SPECIAL SAFETY INSTRUCTIONS: B2BBX ONE-STEPPAINT LINE CLEANING PROCEDURE SEPTEPIBER, 1991 BSBBX Page 2 3.1 Leaks may develop as a resul

7、t of flushing. All pipe joints, especially inside pipe cases, should be checked frequently during cleaning. Repair as required. 3.2 Recommended safe grounding and bonding procedures shall be observed when handling flammable paints and solvents used in thio cleaning procedure. 4. OTHER PRECAUTIONS: 4

8、.1 Concentrated vapors of these materials may be harmful when inhaled. Ventilation should be adequate to control vapors. Chemical goggles and impervious gloves shall be worn by all employees handling these materials. The safe handling and use instructions for these materials can be obtained from the

9、 li-Materials and Toxicology Do not contaminate paint booth water wash system with used solvents or strippers. These materials will liven paint and foul te paint booth sludge handling system. 4.2 4.3 Used solvents should be placed into tagged (or clearly icientifiad) drums for subsequent reust, recl

10、amation or disposal. 4.4 Removed paint should be placed in clean druss for later use. 4.5 The discharge of solvents and paint strippers is restricted by the Metal Finishing Regulations which require that these producto be prevented from entering the plant waste water straam. 4.6 The following may oc

11、cur after and old or saverely fouled paint system is cleaned: pump failure pipe joint leakage or failure (e.g. unions, elbows, etc.) 4.7 Do not mix clear resin flushing solution and the cleaning agents. Under certain conditions of use, such as temperature elevations, a clear resin flush can plate ou

12、t on pump impellers and cause subsequent seizure. Also, dried clear resin deposits are extremely difficult to remove. A clear resin flush is used just prior to loading paint to remove loose deposits, especially in the drops. Always verify with the paint supplier that the clear resin flushing materia

13、l is compatible with the paint. 4.8 Completely plugged lines or sections of lines are usually rodded prior t-chemical cleaning. FORD ”UFAmING STANDARDS - B2BBX ONE- STEP PAINT LINE CLEANING PROCEDURE B2BBX SEPTPIBER, 1991 Page 3 4.9 When blowing out a pipe line with air, all discharge should be into

14、 the paint circulation tank (located in the Paint Hix Room). The tank cover should be clamped shut to insure proper venting. 5.0 OTHER INSTRUCTIONS: 5.1 When old or new booths and old or new lines are being reworked while other system sections must be kept operational for production, certain section

15、s of the paint circulation system may be isolated and cleaned separately according to this procedure. Up to three systems can be combined in series for this type of cleaning. A pump, a suitably sized reservoir are usually required to do this cleaning. New sections require a H99B18iA(F) flush only. 5

16、.2 5.3 Experience has shown that the cleaning process can be expedited by transferring the cleaning materials from clean system directly to dirty system tanks. MUJ260 (shown on manufacturing standard MlW200) is the recommended preservative for clean, inactive paint liner. Do not use clear resin as a

17、 preservative. 6. CLEANING PROCEDURE: 6.1 6.2 6.3 6.4 PRIOR TO CLEANING, HONITOR THE FOLLOWING: Calculata proper flow rate and system pressure Mersure flow rato In CPn Walk the system A. Remove all filters from the line and the tanks. B. Remove all hoses including automatics. On each line to be clea

18、ned, identify and tag all the valves and restric- torr. Pump paint out of tanks. Push remaining paint out of circulating system by loading one drum of a paint compatible solvent to act as a physical buffer between the recoverable paint and the M no. M99B18lA(F) S-575 pre-cleaner. Fill system with M

19、no. M99B18U(F) (S-575) pre-cleaner. Circulate the M no. M99B18lA(F) (5-575) pre-cleaner and verify flow at all drops by closing the bypass and opening the supply side, then closing the supply side and opening the return side. Then closed ehe return side and reopen bypass. FORD UA“ACIURING STANDARDS

20、B2BBX ONE-STEPPAINT LINE CLZWING PROCEDURE B2BBX SEPTEMBER, 1991 Page 4 6.4.1 If any drops are plugged, they must be unplugged before continuing. 6.5 Unload the M no. M99Bl8lA(F) (S-575) pre-cleaner by pushing it out with the M no. M99B18OA(F) (S-585) COBRA Paint Line Stripper. Circulate the paint l

21、ine stripper and verify flow at all drops as in step 6.4. 6.6 After circulating the COBRA Paint Line Stripper for twelve hours, check the pipes for cleanliness. 6.6.1 A short air blow down will be required before opening che line for a yisual inspection. 6.6.2 The visual inspection should be done at

22、 the end of the booth farthest from the paint kltchen. 6.6.3 If the lines are clean, proceed to the next stop. If not, refill the system with the COBRA Paint Line Stripper for eight more hours and repeat steps 6.6.1, 6.6.2, and 6.6.3. 6.6.1 If lines are rusty, proceed to alternate No. I. 6.7 Remove

23、the M no. H99B180A(F) (S-585) COBRA Paint Line Stripper by flushing it out with a paint compatible thinner. 6.7.1 The first SO to 100 gallons of thinner returning to the paint tank from the circulating system should be discharged. 6.8 Install a 100 micron bag filter on the return line in the paint m

24、ix tank and filter the paint-compatible thinner. Change the filter bags as required and vork dotn to a 5 micron bag. 6.9 During the thinner flush, flow at all drops must be verified as outlined in step 6.4. 6.10 Fill the system with a paint-compatible resin of the type recommended by tha paint suppl

25、ier and verify flow at all drops as outlined In step 6.4 Filter resin through a 5 micron filter bag on the paint mix tank return line. 6.11 The resin can be pushed out with a compatible paint thinner and paint reintroduced into the paint system. 7. ALTERNATE I: 7.1 Introduce KSB3Ol.A (S-730) alkalin

26、e cleaner and rust remover. B2BBX ONE-STEP PAINT LINE CLFANING PROCEDURE B2BBX SEPTEMBER, 1991 Page 5 7.1.1 7.1.2 7.2 7.3 7.3.1 7.3.2 7.4 7.5 Bleed all drops to verify flow. Install 100 micron bag filter at return line in paint mix tank. Observe filter bags and change as necessary working down to a

27、5 micron bag. Flush system for 6 to 8 hours. Remove M5B30LA (S-730). alkaline cleaner and rust remover from paint system and use water to flush all solution out of paint lines. Water should be pumped into the system, circulated, and out by continually adding fresh water. Ths water flush is normally three times the system capacity. Check water until a neutral pH is attained. Bleed all drops during water flush. Push water out of systoi with isopropyl alcohol and circulate the alcohol and bleed a11 drops. Continue with steps 6.7 thru 6.11. E 1b 0053237 LAB