Winter Considerations for your Flame Arrestors:

Flame Arrestors are passive devices that require no external power to do their job which is to protect your equipment from flame flash back. All other options require some sort of power or human interface in order to function properly and are therefore subject to failure.

Remember that flame arrestors, like your other plant equipment need regular maintenance.

In the winter flame arrestors may plug and freeze off.

There are options to mitigate this.

1) Mount the arrestor on an angle of at least 45 degrees, this allows liquids to drain away from the cell element through a drain plug in the transition end of the arrestors.

2) Freeze protect the arrestor using some form of heat tracing. Remember this is only freeze protection and the goal here is to keep the arrestor just above freezing. Arrestors work by cooling the flame and if you keep them too warm the efficiency of the arrestor is reduced.

3) Monitor when to clean the cell by monitoring the pressure drop across the cell. Two connections for pressure transducers (one on each side of the cell) can be requested when purchasing the arrestor. We can provide a predicted pressure drop across the arrestor and the transducers can then be used to monitor the pressure drop, when it increases it is time to clean the cell.

4) Flame arrestor bypass using a Rupture Pin Valve. In the event the flame arrestor becomes plugged the Rupture Pin valve will buckle and the pressure will be relieved. A Rupture Pin Valve is not compromised by pressure fluctuations and the pressure increase from a flame front coming down the stack. The Rupture Pin valve will reseat in a closed position to prevent the flame from by passing the flame arrestor. As the pin is mounted external to the process it is easy to do regular visual checks to see if the valve has tripped, or you can install a proximity switch that will alarm if the RP Valve has opened. Changing the Rupture Pin is a simple 5- minute one person job to.

Rupture or Burst Disk Option is NOT recommended. Rupture disks are designed to fail in the direction of flow if the pressure increases over the set point. Fluctuations in pressure can cause the disk to fail prematurely. If a flame front comes down the stack the increased pressure can cause the disk to fail and allow the flame to circumvent the flame arrestor and access the equipment you are trying to protect.

Zirco Thermal Reusable Insulation Blankets:


ZIRCO has custom made insulation blankets for the complete line of Enardo PVRV valves.
Blankets can be made for vents, valves, flanges and more
Customized with pre-installed electrical heat tracing
Customized for equipment with permanent heat tracing lines installed.
Standard materials are 18 oz. Teflon or 17 oz. Silicon cloth, glass blown fiber insulation.
Customized for temperature ranges & chemical resistance

EPG Pump Installation Guideline:

Installation Checklist  

The success of a Pumps & Controls installation begins at the design stage of each project and carries through to that very moment a new pump is cycled for the first time.

If you are the consultant, you are charged with meeting regulator requirements, fulfilling the needs of the landfill, and doing so in a cost effective manner. 

As the contractor, you may not be asked to take ownership of the system but your reputation is riding on a system that functions as intended. Your attention to detail during the installation will pay off in the future.  

Regional engineers and operations people don’t necessarily need to become experts, but they should have a good understanding of their pumping systems and be able to provide a basic level of support or troubleshooting.

Installation DOs and DON’Ts



  • Tailor specifications to each job
  • Use qualified and experienced installers & electricians
  • Establish good electrical ground
  • Adhere to color coding of wiring
  • Design properly sized force main  
  • Include air release valves in force main
  • Install pressure gauge in pump discharge line


  • Over size pumps
    • Excessive flow rate creates high velocity in sump, pulling in fines
    • Excessive pump head can lead to overload and vibration
  • Place control panel too close to riser or sump  
  • Forget to use seal-offs & not potting them 
  • Leave excess cable and hose in sump or riser

 Installing a SurePump

After running first few days:

  • Check that adequate grounding remains
  • Check voltage 
  • Look for signs of power surges (lightning)
  • Installation problems may be traced back to:  
    • Poor connections
    • Mishandled parts
    • Pump flow rate too high for sump design
    • Pumps clogged with HDPE chips or sand

After several months of service:

  • Check that adequate grounding remains
  • Check voltage
  • Look for signs of power surges (lightning)
  • Do pumps perform as expected?
  • Is there noticeable Gas Effect in play (unreliable level readings)?