Pressure/Vacuum Relief Applications

TC Style CB20-256 20" Pressure/Vacuum Thief Hatch

TC style tank hatch - CB20-256
  • Carbon Steel & Stainless Steel
  • 20" diameter with 256 PRV

TC Style CB20-54 Pressure/Vacuum Thief Hatch

TC style tank hatch - CB20-54
  • Carbon Steel & Stainless Steel
  • 20" diameter manway with 8" PRV hatch

TC Style - HC 20" full opening pressure/vacuum relieving tank hatch for bulk storage tanks

TC style tank hatch - HC
Base Cover Dome Pressure Option
1 Cast Aluminum 1 Cast Aluminum 1 Plated Steel Dome 0 1 oz. Aluminum Dome
2 Cast Aluminum Dome 0 2 oz. Steel Dome (1 oz. setting)
2 5 oz. Steel Dome
3 6 oz. Steel Dome
4 8 oz. Steel Dome
  • Applications: Baghouse, food products, grain elevators, industrial products, silos
  • Features: Full opening cover can be used for sampling or inspection; available with bolt-on flange only
  • Pressure relief of 291 sq. in. free area and vacuum relief of 78.5 sq. in. free area
  • Not for use with hazardous materials; product can be emitted when relieving pressure
  • Avg. ship weight:
    • HC1120 - 40 lbs.
    • HC1110 - 60 lbs.
    • HC1111 - 100 lbs.
  • Overall height: Approx. 10 1/4"
  • Vacuum setting (not adjustable): 0.5 oz./sq. in. (all models)

TC Style - HA 8" full opening pressure/vacuum relieving tank hatch

TC style tank hatch - HA
Base Cover Dome Pressure Option
1 Steel, Weld, Straight 1 Plated Steel 1 Plated 0 None
2 Cast Iron, Flanged, Sloped
  • Applications: Baghouse, food products, grain elevators, industrial products, silos
  • Features: Full opening cover can be used for sampling or inspection; available with bolt-on flanged base or straight weld-on base; dependable design is easy to maintain pressure relief of 46.4 sq. in. free area and vacuum relief of 15.9 sq. in. free area
  • Not for use with hazardous materials; product can be emitted when relieving pressure
  • Avg. ship weight:
    • Flanged base - 14 lbs.
    • Weld ring - 19 lbs.
  • Overall height: Approx. 5 1/4" (weld base), 4 5/8" (flanged base)
  • Relieves pressure at 1.5 oz./sq. in. and vacuum at 0.5 oz./sq. in.

TC Style - HH 24" full opening pressure/vacuum relieving tank hatch

TC style tank hatch - HH
Pressure Settings Vacuum Settings Gasket
2.0 oz. through 29 oz. 0.5 oz. through 9 oz. White food grade (FDA Approved)
(Increments of 1.0 oz.) (Increments of 1.0 oz. after the 1.0 oz. setting) Std. vacuum settings is 0.5 oz.
  • Applications: Baghouse, food products, grain elevators, industrial products, silos
  • Features: All-aluminum contact parts eliminate corrosion; no internal hardware to contaminate products; weather hood provides protection from elements; palm nuts allow for quick, easy opening; large 24" opening provides higher venting capacity and improved access into equipment
  • Avg. ship weight: 81 lbs.
  • Overall height: Approx. 13"
  • Warning: Cover should be inspected at least once each month to ensure proper operation and properly functioning hardware. The weather hood should be inspected for damage. Replace missing or damaged items.