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PS-G-11 Provisional Specifications for the Design, Construction, Installation, Use, Verification, and Reverification of CPACL Model CPA NPS 2" TBR (Tube Bundle Replacement) Flow Conditioner

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PS-G-11, in PDF format, 356 KB

Table of Contents

1.0 Scope
2.0 Authority
3.0 Description
4.0 Design and Construction
5.0 Installation and Use
6.0 Verification and Reverification


1.0 Scope

These specifications apply only to the Canada Pipeline Accessories Company Ltd. CPA NPS 2" Tube Bundle Replacement (herein referred to as the CPA NPS 2" TBR Flow Conditioner) manufactured by CPACL of Surrey, British Columbia, and Calgary, Alberta, Canada.


2.0 Authority

These specifications are issued under the authority of sections 12 and 18 of the Electricity and Gas Inspection Regulations.


3.0 Description

3.1 The CPA NPS 2” TBR Flow Conditioner is intended to reduce flow disturbances in natural gas and other related hydrocarbon fluids caused by upstream piping design configurations such as one elbow, two or more elbows in and out of plane, flowing tees, partially open valves, and headers. This flow conditioner is designed as an alternative to the NPS 2” 1998 uniform concentric 19 tube bundle flow straightener in NPS 2” line sizes. The flow conditioner consists of a perforated plate with concentrically arranged holes and is illustrated in Figure 1 below.



3.2 In operation, the CPA NPS 2” TBR Flow Conditioner causes the natural gas fluid pipe velocity and turbulence magnitudes with respect to the pipe radial positions to be reconfigured to reference levels. The conditioned flow profile is similar in nature to that which recognized orifice metering specifications require to produce metering accuracy free of bias error due to installation causing disturbances.


4.0 Design and Construction

4.1 The CPA NPS 2” TBR Flow Conditioner shall consist of a plate with 25 chamfered bore holes arranged in a symmetrical, circular pattern as pictorially represented in Figure 2 below. The dimensions of the bore holes are a function of the published inside pipe diameter (D) of the pipe for which the conditioner is intended. The characteristics of importance and their associated quality criteria shall be as follows, corresponding to the letter labellings within Figure 2:

a) a central hole of dimension 0.186 D ± 0.01 D;

b) a centre ring of 8 holes of diameter 0.163 D ± 0.01 D, on a pitch circle of diameter 0.5 D ± 0.01 D;

c) an outer ring of 16 holes of diameter 0.120 D ± 0.01 D, on a pitch circle of diameter 0.85 D ± 0.01 D;

d) perforated plate thickness of 0.242 D ± 0.01 D;

e) pin indentation located on the outer edge to receive a set screw;

f) the diameter of the flow conditioner shall have the diameter dimension in relation to the published pipe diameter (D), and this dimension (f) shall be within -0.020" to +0.000" of D.