Products/Tank Protection & Venting/EFG41

TANK GAUGE HATCH

EFG41
  • Controlled access for tank gauging, sampling and inspection
  • Foot-operated opening through 75 to 80 degrees
  • Self-closing or lock-down cover options
EFSVALVES EFG41 self-closing tank gauge hatch for gauging and sampling
EFSVALVES EFG41 self-closing tank gauge hatch for gauging and sampling
Datasheet

Applications

Configured Service Scope
Chemical
Oil & Gas
Petrochemical
Storage Tanks

Key Specifications

NOMINAL SIZES4" to 12" (DN100 to DN300)
MAXIMUM WORKING PRESSURE3 psig (approx. 0.21 bar(g))
COVER OPTIONSSelf-closing / Lock-down
OPENING ANGLE75 to 80 degrees
BODY MATERIALSCarbon Steel / Stainless Steel
OPERATIONFoot-operated serrated treadle

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FAQs

It provides controlled manual access to a liquid storage tank for level gauging, representative product sampling and visual inspection.
Both terms are used in the storage-tank industry for access devices used for manual gauging, sampling or inspection. The EFG41 is specifically a tank gauge hatch for controlled manual access. It should not be confused with spring-loaded thief hatches that may also incorporate pressure or vacuum relief functions.
It is installed directly on a tank roof nozzle or at the end of an access connection. The flange standard and facing should be defined according to the actual tank connection.
The operator presses the serrated foot treadle to open the hinged cover through approximately 75 to 80 degrees, leaving both hands available for gauging or sampling.

ABOUT EFG41

The EFG41 tank gauge hatch provides controlled manual access to liquid storage tanks for level gauging, product sampling and visual inspection. Installed directly on a tank roof nozzle or at the end of an access connection, it allows an operator to introduce a measuring tape or sampling bottle.

A serrated foot treadle opens the hinged cover through approximately 75 to 80 degrees, leaving both hands free. The self-closing version returns to the closed position when the treadle is released; a lock-down version is available where procedures require the cover to remain secured.

Available from 4 to 12 inches (DN100 to DN300), the EFG41 has a maximum working pressure of 3 psig, approximately 0.21 bar(g). Body options are carbon steel and stainless steel, with a non-sparking configuration available where required.

The EFG41 is a controlled-access gauge hatch. It must not be confused with spring-loaded thief hatches that may also provide pressure or vacuum relief, and it must not replace correctly sized tank venting equipment.

Frequently Asked Questions

It provides controlled manual access to a liquid storage tank for level gauging, representative product sampling and visual inspection.
Both terms are used in the storage-tank industry for access devices used for manual gauging, sampling or inspection. The EFG41 is specifically a tank gauge hatch for controlled manual access. It should not be confused with spring-loaded thief hatches that may also incorporate pressure or vacuum relief functions.
It is installed directly on a tank roof nozzle or at the end of an access connection. The flange standard and facing should be defined according to the actual tank connection.
The operator presses the serrated foot treadle to open the hinged cover through approximately 75 to 80 degrees, leaving both hands available for gauging or sampling.
A self-closing EFG41 returns to the closed position when the operator releases the foot treadle. A lock-down configuration is available where procedures require the cover to remain secured. Select the arrangement according to the tank operating and access procedure.
No. It is a gauging and sampling access hatch, not a pressure or vacuum relief valve. Tank breathing and emergency relief require separately selected and correctly sized venting equipment.
The published range covers 4 to 12 inches, equivalent to DN100 through DN300. Confirm the exact flange drilling and facing for the project.
The published maximum is 3 psig, approximately 0.21 bar(g). Tank operating and upset conditions must remain compatible with the hatch and overall venting design.
Yes. Its materials and suitability should be confirmed against the hazardous-area assessment, stored product and site procedures.
The commercial range is offered in carbon steel and stainless steel. Final selection depends on the stored liquid and vapour, corrosion, temperature and external environment.
Yes. Chemical, Oil & Gas, Petrochemical and Storage Tanks are included in its published application scope. Final selection should consider the stored liquid, vapour conditions, corrosion environment, pressure and temperature.
Provide the stored product and vapour data, operating pressure and temperature, nominal size, flange standard and facing, body material, cover preference, non-sparking requirement and required documents.
Yes. Define tank service, operating conditions, nominal size, flange standard and facing, body material, cover configuration, non-sparking requirement and project documentation during the RFQ stage. Confirm the final configuration against actual tank and project requirements.