© 2019 Department of Petroleum Resources. All rights reserved Department of Petroleum Resources (DPR) PROCEDURE GUIDE

Page 83 of 114
 
82 | P a g e 
 
 
D 
PRESSURE TAPS 
 
 
1 
Orientation 
 
 
2 
Location 
of 
static 
pressure 
transducer 
(upstream/downstream) 
 
 
3 
No. 
of 
differential 
pressure connection 
 
 
4 
Pressure tap size  
 
 
5 
Condition of tap hole 
edge 
 
 
6 
Gauge line length 
 
 
7 
Temperature probe type 
 
 
8 
Densitometer 
(manufacturer, 
type, 
insertion, size, location) 
 
 
9 
Sampler 
(manufacturer, 
type, sample line size, 
location) 
 
 
E 
ORIFICE PLATE 
 
 
1 
Orifice plate type 
 
 
2 
Orifice fitting leak test 
 
 
3 
Bore diameter 
 
 
4 
Orifice outside diameter 
 
 
5 
Orifice plate thickness 
 
 
 
1.10 Orifice plate specifications 
1.10.1   Diameter – the diameter d shall in all cases be greater than or equal to 12.5mm. the 
diameter ratio, β= dm/D shall always be greater than or equal to 0.10 and less than or 
equal to 0.75. 
1.10.2   Thickness E and e – the thickness e of the orifice shall be between 0.005D and 0.02D 
while the thickness E of the plate shall be between e and 0.05D. However, when 
50mm ≤ D ≤ 64mm, a thickness E of up to 3.2mm is acceptable. 
1.10.3   Bevel angle – if the thickness E of the plate exceeds the thickness e of the orifice, the 
plate shall be bevelled on the downstream side. The angle of bevel α, shall be 450 ± 
15o. 
 
1.11 CORIOLIS METER INSTALLATION REQUIREMENT 
1.12 Introduction 
A Coriolis meter is a device consisting of a flow sensor (primary device) and a transmitter 
(secondary device) which measures mass flow and density by means of the interaction 
between a flowing fluid and the oscillation of a tube or tubes. 
The flow sensor consists of an oscillating tube(s), drive system, measurement sensors, 
supporting structure and housing (ISO 10790:2015)