Filter house installation and filter cage operation attention points(3)

Upon completion of the preceding and other system hook ups, etc. you are ready for start-up.

 

 

START-UP CHECK LIST:

 

  1. Compressed Air –

 

Depending on unit size, a one to two inch supply line carrying 85 psig minimum plant air should be connected. It is good practice to blow down piping and air header to remove pipe cuttings, welding rod tips and other debris. An automatic purge valve is supplied on every header for purging moisture from the header.

 

  1. Filter bags or Cartridges –

 

Are theses installed as instructed on previous page.

 

  1. Differential pressure gauge or manometer –

 

Is this properly installed as instructed on previous page.

 

  1. Timer Mechanism –

 

Check to see if wired as shown in Diagram and that the fuse is ok.

 

  1. Auxiliary Equipment –

 

Check to see that there are no foreign objects in rotation equipment. Check rotation of fan, screw conveyor, and airlock. Generally airlocks (rotary valves) are operable running in either direction.

 

  1. Duct work –

 

Check to see that all connections are tight and all clean-outs are closed. Piping must be free of all debris.

 

START-UP DUST CONTROL SYSTEMS:

 

  1. It is good practice to introduce the dust stream on a new bag set at a reduced rate. This is particularly true where either very fine solids (less than 2 microns) or heavy concentrations are present. Set the fan damper at about 60 to 70% of design flow.

 

If uncertain, amperage on the fan motor can be checked to determine air flow. Pre coat the bags with a powder such as lime or use the fines being collected. Use 100 lbs. per 100 bags or 1,000 square feet of filter area. Inject the pre coat into the hopper section; with the pulse system off, run the fan for three minutes to obtain an even pre-coat.

 

  1. Start the discharge system (rotary valve, screw conveyor, air slide, dump valve, etc.)

 

  1. Start timer and be certain that the compressed air supply valve is open. Initial adjustment of time should be 6 seconds between pulses (off time). On time of pulse should be set at 100-110 milliseconds.

 

 

  1. Start main fan.

 

  1. After 20 minutes operation, open fan damper to desired setting. Observe differential pressure – if less than 2” W.G. increase valve “off” time 2 or 3 seconds at a time during the first 8 hours until the differential pressure is 3.5” to 4.0”.

 

 

START-UP PROCESS SYSTEMS:

 

  1. if water vapor or other condensables are present, it will be necessary to preheat the system so the skin temperatures of the piping and collector are above saturation temperature. Dryers, coolers, and certain grinding systems are common examples.

 

  1. Temperature must be controlled to within the thermal limit of the filter media in use.

 

  1. On pneumatic conveying systems, watch the differential pressure gauge closely for the first hour or so. If unstable, the collector discharge system may be too small for the volume it is seeing. A quick fix is to reduce the material feed until the discharge rates can be increased.

 

ALL SYSTEMS:

 

You have purchased equipment to provide a clean stack. If there are visible stack losses, refer to the trouble shooting check list.

 

SHUT DOWN:

 

  1. Dust Control Systems – Reverse start up procedure, shut down fan, then after 5 or 10 minutes delay, shutdown the timer and discharge system.

 

  1. Process Systems – Dryers should have product run down and heat continued at a reduced rate to dry the metal surfaces and filter media.

 

  1. Pneumatic Systems – As in Item 1.

 

Wiring shown for 10 output timer – Wiring similar for 4, 6, and 22 position timers.

 

 

Wiring Notes:

 

  1. Operating Logic: Input power is applied to L1 and L2 at all times upon closure of the isolated control contacts the present “Off” time is initiated. At the end of the

“Off” time, the control will energize a solenoid to provide the cleaning pulse and then transfer to the next solenoid. The cycle continues until the control contacts are opened.

 

  1. Reset – the control can be programmed for fewer than 10 outputs by jumping the program wire to the last output number used.

 

  1. Input – 105 to 135 VAC 50/60 Hz.

 

  1. Output – solid state switch maximum load 60 Watts per output (2 solenoids per

 

output terminal.)

9

  1. Off time adjustable, between 1.5 seconds minimum 60 seconds maximum.

 

  1. Programming – Programming is accomplished by connecting the program wire to the pin corresponding to the number of outputs required.

 

  1. On pulse time width 50 – 500 milliseconds, “On Time” has been preset at factory do not adjust.

 

  1. Where two or more timers are employed solenoid valves should be divided equally between the timers.

 

  1. Recommended wire size No. 16 AWG.

 

  1. Recommended on-off switch by customer to be installed near timer.

 

  1. Suggested off time setting: 6 seconds, refinements may be necessary after system becomes operational to maintain proper differential pressure.

 

  1. Timer to be conveniently located on dust collector by customer.

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