INSTRUCTION CODE NUMBER: 74STRNRCONTROL

 

INSTRUCTION CODE DESCRIPTION: BACKFLUSH STRAINER WS4010

 

  1. EQUIPMENT TO BE MAINTAINED: TWR3 WS4010 BLDG 16 SUPPLY STRAINER

    2.  

  2. SPECIAL TOOLS / EQUIPMENT: NONE

    3.  

  3. PREREQUISITES / PRECAUTIONS:

 

NOTE: The NASA LeRC Safety Manual-TM104438 can be found on the Lewis Web (http://www-osma.lerc.nasa.gov/lsm/) under Policy and Management

 

  1. COORDINATE WITH THE CCB CENTRAL AIR DISPATCHER BEFORE STARTING WORK, PABX 3-3200

 

NOTE : BACKWASH STRAINER WS4010 ON DAY SHIFT ONLY!!!

CONTACT ROBERT ROMAN @ EXT. 3-5600 OR THE EPRB BUILDING MANAGER BEFORE FLUSHING. DO NOT PERFORM THIS TASK WITHOUT THEIR KNOWLEDGE.

 
  1. TASK DESCRIPTION:

 

 

  1. PERFORM A VISUAL INSPECTION OF THE BACKWASH CYCLE CONTROLS LOCATED IN BUILDING #74

    2.  

    Check for loose foundation, abnormal wear and tear, physical changes, signs of degradation, evidence of excessive temperature, rust, chemical action, abrasive action, signs of leaking, water, oil or grease, excessive vibration, hot or noisy bearings, improper ventilation. Check for dirt, torn material, etc.

     

  2. OBSERVE THE PERFORMANCE DURING OPERATION

    3.  

    Check for vibration, bearing noise, leaks, operation of controls, limit switches, pressure switches, and any other control and operating mechanism.

     

  3. BACKWASH OF STRAINER IN CW SUPPLY LINE FOR EPRB #16

    4.  

    The automatic strainer is designed for the continuous straining of cooling tower water with the automatic removal of solids. To automatically remove the collected solids, a differential pressure device set at 3 PSIG actuates the backwash cycle for a period predetermined by the time delay relay in the control box. A gearmotor revolves the backwash arm which in turn reverse flushes each Poro-Edge tube in a consecutive manner when the backwash valve is open.

     

    The backwash cycle can also be put into motion by placing the control switch in the manual position. This can be done periodically for a check but normally the switch is left in the automatic position.

     

    The strainer is located in a heated pit in the common discharge line from CW Pumps #8 and #9 which is the CW supply line to EPRB #16.

     

    If strainer servicing is required refer to Reference Document for the Adams Poro-Edge Automatic Strainer in Volume I of the CAEB Facility Cooling Towers #3 and #6 and Pump Building #74 Equipment, Manufacturers' Manuals and Catalogs.

     

  4. Take appropriate corrective action to report and repair any problems. Record problems and corrective actions in MP2.

    5. 5. CLEAN EQUIPMENT AND SURROUNDING AREA.

     

    Clean dust, oil, grease, water, etc., from the equipment and the surrounding area. Dispose of oil soaked rags, etc., properly.

     

     

  5. RESTORE THE SYSTEM TO NORMAL STANDBY MODE.

 

 

  1. WORKSHEET / CHECKLIST:

 

MAINTENANCE PERSONNEL FEEDBACK FORM

 

A response to the following questions is requested to incorporate any necessary changes. After the work is completed, please answer the following questions and feel free to mark-up the text as necessary.

 

Is the equipment barcode label number in place and correct? Yes____ No_____

If not, verify if the equipment has been replaced or if the barcode label is missing. Submit new equipment data and maintenance forms and/or replacement barcode label numbers to the facility manager.

 

Should the current frequency of this task be modified? If yes, why?

 

 

What is the condition of the equipment in the area work is being performed? Please note any discrepancies.

 

 

 

 

Are there any errors in the procedure text?

 

 

Should the order of any steps be changed?

 

 

 

Are there any safety concerns that should be addressed?

 

 

 

Would modifications to the work order make it easier to utilize?

 

Should this task or its instruction code be combined with other tasks or

 

Are there any steps or other useful information that you would like to be included? (i.e. special tools, part information, or helpful hints, etc.)

 

 

Is this a valid task? If not, why?

 

 

 

TASK START DATE:___________ TASK COMPLETION DATE:____________

 

TIME REQUIRED TO PERFORM TASK:___________

 

NAME(S)______________________________________________