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Rosemount Tank Radar REX
Chapter 10 Mechanical Installation
10-38
Installation Manual
308014EN, Edition 4
May 2013
10.4 Mounting 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.
10.4.1 Temperature 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.
10.4.2 Still 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.