Installation Manual

Rosemount Tank Radar REX

308014EN, Edition 4

Chapter 10 Mechanical Installation

May 2013

 

 

10.4Mounting a LPG/LNG Gauge

The LPG/LNG Gauge fits to a 6" flange and requires a still pipe for measurement.

Please refer to the mechanical installation drawing for more detailed information of the requirements on the installation of the LPG/LNG Gauge.

10.4.1Temperature and Pressure Measurement.

A prerequisite for high accuracy level-measurements in LPG/LNG tanks is that temperature and pressure measurements are made. The REX transmitter can interface pressure sensors and up to six temperature sensors.

10.4.2Still Pipe.

A still pipe must be installed before the gauge is installed. The still pipe is customer supplied and should be manufactured according to the drawings specified in chapter 13.

Three types of steel pipe can be used:

•inner diameter of 100 mm and 2-3 mm wall thickness, or

•4" SCH 10 stainless steel pipe, or

•4" SCH 40 stainless steel pipe.

Specify the pipe type in the Required System Information (RSI) form.

The still pipe must be vertical within ±0.5°. The customer flange must be horizontal within ±1°.

The Still Pipe is manufactured with a number of holes in order to provide pressure equalization so that the product level inside the pipe is equal to the level in the rest of the tank. The diameter of the holes should be 20 mm or 3/4".

All holes must be placed along a line on one side of the pipe and aligned with a bolt hole on the Pipe Flange (see Figure 10-14). The position of the holes must be clearly marked on the Pipe Flange. The Reference Pin (see section 10.4.3) must be directed towards this bolt hole. The flange marking is used to properly align the gauge with the Reference Pin.

10-38

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Emerson 308014EN, Edition 4 10-38, Mounting a LPG/LNG Gauge, Temperature and Pressure Measurement, Still Pipe
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308014EN, Edition 4 specifications

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