tailieunhanh - Machinery Component Maintenance and Repair Part 6

Tham khảo tài liệu 'machinery component maintenance and repair part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 190 Machinery Component Maintenance and Repair Appendix 4-B Specifications for Cleaning Mechanical Seal Pots and Piping for Centrifugal Pumps I. SCOPE 1. This specification covers the inspection cleaning AND PRESERVATION of mechanical seal pots and their associated piping on new pumps prior to startup and commissioning and on existing pumps which have their mechanical seal piping modified. 2. This work shall be done concurrently with cleaning AND SETTING OF MECHANICAL SEALS ON NEW PUMPS. II. MATERIALS 1. The following materials will be required for this WORK Fresh WATER Sodium hydroxide Sodium metasilicate Trisodium phosphate Non-ionic detergent Hydrochloric acid Ammonium BIFLOURIDE ARMOHIB 28 OR EQUIVALENT Citric acid Soda ash Sodium Nitrite 10 MICRON filter screens These chemicals are not used to clean stainless steel piping OR SEAL POTS. 2. Quantities will vary based ON THE SIZE AND AMOUNT OF PIPING TO BE CLEANED. III. DISASSEMBLY 1. All INSTRUMENTATION IN THE SEAL PIPING SHALL BE REMOVED PRIOR TO DISASSEMBLY OF THE PIPING AND SEAL POTS. 191 192 Machinery Component Maintenance and Repair 2. The instrumentation shall be tagged and stored in A SAFE manner. 3. The seal piping shall be broken at the two closest FLANGED OR UNION CONNECTIONS TO THE PUMP OR GLAND AND TAKEN TO THE SHOP IN ONE PIECE. 4. If the piping can be broken down into shorter SEGMENTS FOR EASIER CLEANING IT MAY BE DONE IN THE SHOP. 5. Openings on the pump and or gland shall BE PLUGGED OR CAPPED TO PREVENT ENTRY OF DIRT INTO THE PUMP WHILE THE PIPING IS IN THE SHOP. IV. CLEANING 1. All PIPING AND SEAL POTS SHALL BE FLUSHED WITH 17O F TO 2OO F ALKALINE SOLUTION CONTAINING THREE 3 PERCENT NaOH one 1 PERCENT SODIUM METASILICATE ONE 1 PERCENT TRISODIUM PHOSPHATE AND ONE TENTH PERCENT NON-IONIC DETERGENT IN FRESH WATER. This SOLUTION IS TO BE CIRCULATED FOR AT LEAST SIX 6 HOURS. The piping and POTS SHALL THEN BE DRAINED AND FLUSHED WITH FRESH WATER UNTIL THE pH LEVEL IS LESS THAN . Water for .