Gauge Hatches

LOCKABLE GAUGE HATCH SIZE – 3” (75 mm)
All brass construction with 3” API screwed connection. The thick elastomer ring dovetailed into the recess in the cover provides maximum vapor tightness and security against sparking.
Brass body and cover. Screwed 3” API.

PRESSURE TYPE GAUGE HATCH SIZES – 4” (100 mm), 6” (150 mm), 8” (200 mm)
Cast iron cover incorporates a heavy synthetic rubber ring dovetailed into a recess, In 4” and 6” sizes a special moulded plastic seat inserted into the base ensures maximum vapor tightness and security against sparking. A drip ring drains condensate away from the joint face to minimize the effects of freezing.

Uniform tightness at all points between the cover and the base is provided by a spherical self draining connection between the lever and the cover. Should sticking occur due to infrequent opening the handle use to screw down the cover can be removed and used to loosen the cover by continuing to rotate anti-clockwise until the cover lifts.
Steel body – cast iron cover – bronze lever. 150 lbs ASA flange.

SPARK-PROOF GAUGE HATCH SIZE – 8” (200 mm)
Cast steel base can be supplied undrilled for welding directly to tank roof plates, or drilled for fitting to tank roof nozzle.
A brass insert ring in the base is machined to give radial contact with the conical seating of the brass cover thereby ensuring an effective long term seal. Base has gauging notch located just below the insert ring.
Cast steel base – brass cover – bronze handle. Flange 150 lbs ASA flat face (FF).

GAUGE HATCH SIZES – 4” (100 mm), 6” (150 mm), 8” (200 mm)
The aluminium base, with gauging notch, incorporates a self draining seat and has 8 slotted holes to facilitate mounting on the range of tank roof flanges listed opposite.

The aluminium cover is secured to the base with a stainless steel hinge pin. A nitrile rubber “O” ring seal is fitted into the cover to provide tight closure and to cushion the effects of repeated operation.

The units can accommodate service temperatures of -300C to +900C.

SCREW DOWN GAUGE HATCH SIZES – 4” (100 mm), 6” (150 mm), 8” (200mm)
The aluminium base, with gauging notch, incorporates a self draining seat and has 8 slotted holes to facilitate mounting on the range of tank roof flanges listed opposite.

The aluminium cover is secured to the base with a stainless steel hinge pin. A nitrile rubber “O” ring seal is fitted into the cover to provide tight closure and to cushion the effects of repeated operation. The cover of the Fig. 5072 is slotted to accept the eye bolt and hand nut used for clamping the cover. The units can accommodate service temperatures of -300C to +900C.