Page 182 - Machinery Component Maintenance

164 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 170'F
TO 200'F ALKALINE SOLUTION CONTAINING THREE (3) PER-
CENT NAOH, ONE (1) PERCENT SODIUM METASILICATE, ONE
(1) PERCENT TRISODIUM PHOSPHATE AND ONE TENTH (0.1)
PERCENT NON-IONIC DETERGENT IN FRESH WATER, THIS
SOLUTION IS TO BE CIRCULATED FOR A1 I FAST STX (6)
HOURS. THE PIPING AND POTS SHALL THEN BE DRAINED
AND FLUSHED WITH FRESH WATER UNTIL THE PH LEVEL IS
LESS THAN 8.0. WATER FOR STAIN1 LES? STEEL PIPING AND
SEAL POTS SHALL CONTAIN LESS THAN !
BO PPM CHLORIDE,
2. STAINLESS STEEL PIPING AND SEAL POTS SHALL BE FURTHER
FLUSHED WITH 160'F FRESH WATER CONTAINING LESS THAN
50 PPM CHLORIDE AT A HIGH ENOUGH VELOCITY TO REMOVE
ALL DIRT. THE PIPING RUNS SHALL BE POSITIONED AND
SUPPORTED SO AS TO HAVE NO DEAD SPOTS WITH THE WATER
ENTERING AT THE LOWEST POINT IN THE PIPING AND EXITING
AT THE HIGHEST POINT. THE CIRCULATED WATER SHALL BE
FILTERED THROUGH TEN (10) MICRON FILTER SCREENS AND
RETURNED TO AN OPEN STORAGE TANK BEFORE BEING RECIR-
CULATED. WHEN THE FILTER SCREENS REMAIN CLEAN FOR
FIVE (5) MINUTES, CIRCULATION MAY BE TERMINATED AND
THE PIPING AND SEAL POT AIR DRIED,
3. CARBON STEEL PIPING AND POTS SHALL BE FLUSHED IN THE
SAME MANNER AS THE STAINLESS STEEL PIPING AND SEAL
POTS EXCEPT THAT SIX (6) TO TEN (10) PERCENT INHIBITED
HYDROCHLORIC ACID BY WEIGHT WITH TWENTY-FIVE HUNDRETHS
(0.25) PERCENT AMMONIUM BIFLORIDE BY WEIGHT INHIBITED
WITH TWO (2) GALLONS PER 1000 GALLONS ARMOHIB 28,
RODINE 213, OR EQUIVALENT IN FRESH WATER SHALL BE USED,
4. THE ACID SOLUTION SHALL BE HEATED TO 160'F AND
CIRCULATED AT A SLOW RATE FOR SIX (6) HOURS OR UNTIL
THE REACTION IS COMPLETE.
5. SAMPLES OF THE ACID SOLUTION SHALL BE TAKEN AT HOURLY
INTERVALS AND TESTED FOR ACID STRENGTH AND TOTAL IRON
CONCENTRATION. IF THE ACID CONCENTRATION DROPS BELOW
THREE (3) PERCENT, ACID SHALL BE ADDED TO RAISE THE
CONCENTRATION TO FIVE (5) PERCENT, CLEANING SHALL
CONTINUE UNTIL IRON AND ACID CONCENTRATION REACH
EQUILIBRIUM.
6. AFTER ACID FLUSHING HAS BEEN COMPLETED, THE PIPING
AND SEAL POTS SHALL BE DRAINED AND FLUSHED WITH FRESH
WATER CONTAINING ONE TENTH (0.1) PERCENT BY WEIGHT
CITRIC ACID.