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About Non Atmospheric Gauge Hatch

General Specification

The Slot Dipping Device (S3.6100J) has been designed to provide a convenient and safe means of manually measuring the levels and taking samples of petroleum, petrochemical, chemical and other volatile or hazardous liquids in bulk storage tanks, in pressures of up to 40” (1016 mm) WG.

It is available in 6” (150 mm) size and is mounted on the roofs of tanks and can be used in place of conventional gauge hatches with the following advantages :

  • Negligible loss of vapour.
  • Operators not exposed to hazardous vapours.
  • No product spillage due to wiping of the tape.

The Temperature and Sampling Device has been designed to provide a means of taking samples of products stored in bulk in the petroleum,petrochemical, chemical and allied industries. When used in conjunction with the Slot Dipping Device which is suitable for pressures up to 40” (1016 mm) WG, loss of vapour is greatly reduced.


All tank environmental protection equipments can be supported by our service department who can be supported by our service department who can provide expert and specialist installation and commissioning service and complete ‘on site’ equipment maintenance, repair and servicing facilities including equipment condition surveying and certifi cation and maintenence training.


  1. Mount the S3.6100J Series Sampling Device on a 4”, 6”, 8” flange roof nozzle.
  2. Attach the gauging bob or sampling bottle to the swivel snap inside the sampling chamber unit.
  3. Check the distance from the bottom of the bob to a point above the snap on the tape to make certain a correct reading is obtained.

Operation Construction

The assembly consists of an upper and lower body section with a counter balanced lever operated closing pallet in the lower section. The upper section is sized to accommodate the dip weight or sampling device when the isolating pallet in the lower section is closed. The hinged cap closing the upper section is constructed to accept the bayonet fitting of the rope or tape adaptor. When the fitting is not in use it is closed by a sealing plug. The main components – body sections, cap and closure pallet are constructed in Aluminium alloy


The lower body section is drilled to ANSI 150# or PN16 flanged.


S3.6100J Series Sampling Unit can be used for :

  1. Gauging the depth of the product.
  2. Taking a sample at any level.
  3. Measuring the depth of water bottom.
  4. Measuring the product temperature.

Hand Gauging

Tape Adaptor (Fig.5074-89) has a small clearance around the tape through which only a very small amount of vapour can escape and is permanently attached to the tape. When the upper section of the device is isolated from the tank by the closure pallet the plug can be removed and the tape weight inserted with the tape adaptor replacing the plug.

Gauging can proceed when closure pallet has been lowered. Indicating paste is normally used when gauging spirit tanks. When gauging black oil tanks it is advisable to use the Fig.5074-88 adaptor which incorporates a tape wiper. A hard Beryllium copper strip in the adaptor holds the graduated side of the tape clear of the edge of the slot. The aperture in the upper section cap is 46 mm diameter and will allow passage of all known standard tape weights and the plunger of the Figure 1215 Portable Temperature Sensor.


Either a gauging tape or a PVC covered wire rope can be used with the corresponding adaptor. The method of sampling follows closely that for gauging except that the cap on the upper chamber is opened and the sampling device (Fig.3419) is placed in the upper section and the tape/rope connected. The tape adaptor (Fig. 5074-89) or rope adaptor (Fig. 5074-90) is inserted in the cap and after lowering the pallet, sampling can proceed.