1800 Pennsylvania Ave. West Warren, PA 16365

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Model PAF 306-98, 16″ Manhole. MC306 Replacement Pressure Relief Device
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  • REPLACEMENT FOR PAF 9000 MODELS
  • INTEGRAL 10” FILL/PRESSURE RELIEF
  • VALVE WITH MC306 SET PRESSURE
  • LESS THAN 1 LITER LEAKAGE
  • SECONDARY SAFETY LATCH

Pressure Relief Valve setting 3.0 psig
Rated Pressure Actuated Emergency Venting:
250,000 cu. ft. free air per hour @ 5.0 psig
Rated Liquid Flow Capacity 1012 gpm @ 5.0 psig

PAF manholes with integral latch style surge suppression relief valves are designed for use as replacements for PAF9000 model manhole assemblies on MC306 tanks. Manholes are certified and marked in accordance with 49CFR178.345-5 with a test pressure of 36 psig. Manhole covers are 7 gage steel or stainless and are secured to the tank weld collar with a clamp ring and bolt which can be easily removed to provide access into the tank.

The integral 10” relief valve provides emergency pressure relief and meets the 1 liter surge leakage limit imposed by 49CFR178.345-10(b)(3)(ii). The relief valve also serves as a 10” latch style fill which can be easily opened to provide access for filling the tank or for inspection. Relief valves contain an adjustment feature to allow for fine-tuning of set pressure in the field. Other standard features include a heavy duty clamp ring, secondary safety latch and model 6238ALB pressure-vacuum vent mounted in the 10” relief valve cover.

Manholes are available with a self-latching feature that allows the 10” relief valve/fill cover to drop and securely latch upon movement of the tank if the cover is inadvertently left open. For self-latching model substitute R442 for R416 in assembly number.