flow control applications-tball

7/29/2019 Flow Control Applications-Tball

1/28

Flow Control Applications

Selection of valves and control

equipment


2/28

Flow Control Considerations

Flow range

Turndown required

Minimum allowable pressure drop

Maximum pressure differential

Maximum allowable noise level

Above or below grade application Customer interface (RTU, existing I/P)

Failure position

Always requires a positioner (HPP or EFP)

Avoid over-sizing the control valve Less number valves is always desirable and most cost

effective


3/28

Situations to avoid

Multiple valve configurations 1 valve is always best

High turndown situations require high turndown valve

Design flow vs. realistic flow

Design flow may not ever be achieved resulting in

oversized valve

Valve opening less than 10% at minimum flow condition

Constant cycling will occur than cannot be tuned out

High noise levels

Caused when high flow and high differential exist Constant bleed positioners


4/28

Valve Selection

Rotary Valves

Ball valves (T-Ball)

Segmented ball valves (Paramax)

Reciprocating Valves

Globe valves (CVET & 41005)

Top entry design facili-

tates maintenance andallows valve to be ser-

Kwik-ChangeCage providevariable flow

characteristicsand available

noise attenua-tion

Internal compo-nents are inter-changeable

Pressure ratingsfrom 150 to 1500ANSI

End ConnectionsAvailable:

RFFE

RTJ

Screwed EndWeld-End

Sizes Available from1 bore to 8 bore


5/28

T-Ball Comparison

Pros

High capacity

Minimum pressure drop (


6/28

Paramax Comparison

Pros

Cost effective

High capacity

Excellent low flow

controllability

High turndown (100:1)

Minimum pressure drop (


7/28

Globe Valve Comparison

Pros

Cost effective

Top entry design allows for

easy maintenance

Simple construction with

minimum parts

Noise attenuating trim up to

25 dBA reduction

Most widely known as a

control valve

Quick delivery

Cons

Single seated

Cannot be buried

Limited capacity

Minimum 5 psi pressure

differential

Low turndown (35:1)

Soft seat requires periodic

replacement especially when

debris is present


8/28

Valve Sizing & Selection Process

Use T0 ball

valve sizing program

with conditions givenBpeSize 2.3

Review flow &

Pressure conditions

Use Globe valve

Sizing program

GlobeSize 4.0

Below gradeNo

Yes

Dp < 5 psiNo

Yes

High flow rate

Yes

No

Next

slide

Use T1, T2 ball

Valve sizing program

With conditions givenT-Ball 3.5.1

Consult factory for

Paramax sizing

Alt Alt

Case 1 Max Cv:

Max flow &

Min Dp

Case 2 Min Cv:

Min flow &

Max Dp

Case 3 Max Noise:

Max flow &

Max Dp


9/28

Ball Valve Selection Process

Is T0 < 1% open

in Case 2

Noise too high

In Case 3

No Selection & Sizing

Complete

T0 is proper valve

Resize with T1 usingT-Ball sizing

program

Yes Yes

No

Is valve< 10 deg open

in Case 2

Noise too highIn Case 3

Change valve model

To T2 in T-Ball

Sizing program

Selection & Sizing

Complete

T1 is proper valve

Is valve

< 10 deg open

in Case 2

Noise too high

In Case 3

Selection & SizingComplete

T2 is proper valve

Globe

Valve

required

Yes Yes

NoNo

NoNo

Yes

Yes

Use diffuser or

Silencer w/ valve


10/28

Globe Valve Selection Process

Is valve

> 10% openin Case 2

Consult factory for

alternatives

No

Required

Noise levels met

In Case 3

Yes

Does valve

meet max Cv

in Case 1

Yes

Use ball valve

for application or

multiple runs

No

Selection complete

Globe valve properly

Sized and configured

No

Use1-stage or 2-stage

Noise trim


11/28

Typical Flow Control Valve

Most common flow control valve is configured as follows:

Model T0 T-Ball Full Port Ball Valve, RFFE

RPDA Series Double-Acting Actuator

EFP-2 Electro-Pneumatic Positioner

MCV-3 Manual Control Valve

FD-1 Gas Supply System

T-1F ball valve with same components 2nd most common

configuration

Schematic


12/28

Optional Equipment

Pressure control override (VRP pilot)

High pressure shutdown (Pressure sensor or Gap

controller)

Failsafe overrides (power gas loss, electrical signal loss,

electrical power loss)


13/28

Example Flow Control Application:

Customer: Panhandle Eastern Pipe Line

Location: Indianapolis, IN

Sizing: 6 T-1F

8 T-1F

Competition: Fisher EWT globe valves

Note: 3 globe valves runs required to maximum flowrate. Noise is an issue. Below grade not an

option.


14/28

Example Flow Control Application:

Single flow control valve with 8 Becker model T-1F withRPDA actuator and EFP-2 electro-pneumatic positioner if

high flow, high differential condition does not exist Dual run flow control valves with 6 Becker model T-1F with

RPDA actuator and EFP-2 electro-pneumatic positioner if allflow and pressure conditions exist

External diffuser offered to meet low noise requirement EFP is non-bleeding positioner

Less valves provides a more cost effective approach up

front

Non-bleeding positioner provides lower operating cost infuture


15/28

Flow Control Valve

InstrumentationPneumatic PositionersElectro-Pneumatic Positioners


16/28

HPP-4 Double-Acting Pneumatic Positione

Positioner used with RPDA &SYDA actuators

3-15 psig or 6-30 psig input signal Seat & Nozzle constant bleed

design

Ideal for downstream bleedapplications < 300 psig

psi signal accuracy Used on 2 42 valve sizes

All materials 100% natural gascompatible

Simple adjustment


17/28

HPP-5 Double-Acting Pneumatic Positione

Positioner used with RPDA &

SYDA actuators

3-15 psig or 6-30 psig input signal

Balanced valve design offers

near zero atmospheric bleed

Can bleed to a pressure system

flow control applications-tball

Documents