Design
Engineering Compact Guide
INCLUDE:
Control Valve definition, reading control valve in P&ID, control valve
Manufacturer, trim, actuator, trip valve, positioner, liquid sizing equation, choke flow, cavitation, flashing, gas sizing equation, bench set, accesories, oil and gas industry application, Instrucalc sizing, and design recommendation.
Compact Guide Instrumentation Control Valve Design Engineering
This Compact Guide is designed to be brief and to the point. Covers most important topics and good practice in oil and gas industry and professional work to supercharge your instrumentation and control design engineering skills.
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Welcome to the Compact Guide for Control
designed to be brief and to the point, covers professional work to supercharge your instrumentation skills.
You will learn a quick and practical knowledge
This will include : control valve definition, reading Manufacturer, trim, actuator, trip valve, positioner, cavitation, flashing, gas sizing equation, bench application, control valve Instrucalc sizing,
We hope this guide will efficiently improve knowledge and skill.
Thank you.
Feri ArdianControl Valve Design Engineering. This guide is covers important topics and good practice in instrumentation & control design engineering knowledge for design engineering of Control Valve. reading control valve in P&ID, control valve positioner, liquid sizing equation, choke flow, bench set, accesories, oil and gas industry and design recommendation.
your control valve design engineering
P&ID is a standard process drawing shows Piping and Instrumentation Diagram in a facility.
In this sample of P&ID, it shows a Production Separator SMN-MBD-101 with its piping and instrumentation. There are 2 control valves in this Production Separator : LCV-101 for liquid control and PCV-101A for pressure control.
In a control loop, there are 3 components involved : sensor for measurement, a controller, and an actuator/final control element. In this case, there are two control loop for Production Separator, one is for liquid control and second is for pressure control.
For case in this P&ID, Element for the Liquid Control is : LT-101B (as a sensor for level measurement and transmit the measurement to LIC-101B).
LIC-101B (as a controller which compare level measurement from LT-101B with the set point, and give control output).
LCV-101 (as a final control element which received control signal from LIC-101B to manipulate the flow).
Element f r the Pressure C ntr l is : PT 101A (as a sens r f r pressure measurement and transmit the measurement t PIC 101A).
PIC 101A (as a c ntr ller which c mpare pressure measurement fr m PT 101A with the set p int, and give c ntr l utput).
PCV 101A (as a final c ntr l element which received c ntr l signal fr m PIC 101A t manipulate the fl w).
Other inf rmati n that we can retrieve is LCV 101 size is 1”.
Line number f r LCV 101 is
2” HL 0037 6B (2” means size f the pipe, HL is service c de Hydr carb n Liquid, 0037 is line number sequence, and 6B is the pipe specificati n material c de). Each pr ject has its unique pipe identificati n s read the P&ID Legend and Symb l.
LCV 101 fail p siti n is cl sed (FC).
Other inf rmati n that we can retrieve is
PCV 101A size is 2”.
Line number f r PCV 101A is
4” HG 0045 6B. HG is service c de (Hydr carb n Gas), pipe spec is 6B.
PCV 101A fail p siti n is pen (FO).
Each project will have Pipe Specification document which provide information about piping size, material, class/rating used in the project.
Other important document which we need to review is Valve Specification document. This document will provide information related with valve size, type, material of construction of the valve used in the project.
Those documents are maintained by piping discipline. Depend on project, sometimes those documents combined in one document only.
From previous page we have following information :
LCV-101 has 1” size and 6B pipe specificatio
PCV-101A has 2” size and 6B pipe specification
From pipe material specification document we search for code 6B as snapshot in this page.
6B is pipe with following specification ating is 600#
Pipe Material is Carbon Steel
Then we look or Valve section particularly in Globe section, since our control valve type is globe.
LCV 101 size is 1”, the globe valve
specification code is V401
PCV 101A size is 2”, the globe valve
specification code is V4611
From Valve specification V4019 ( or LCV 101 we can get ollowing in ormation :
Valve rating and end connection is API
Class 1500 with Socket Weld RF Flange typ
Valve body & bonnet material is ASTM A105 orged steel
Valve trim material (plug and cage is AISI 410 or 420 Stainless Steel
Valve seat material is AISI 410 SS with stellite grade 6
Bolting is ASTM A193 B7 bolt and ASTM A194 2H nut
Please note that valve flange rating above is API Class 1500. It is using API not ASME. While the pipe itsel using ASME 600#. The difference between API and ASME flange rating standard is: at the same level, normally API flange has higher rated operating pressure than ASME flange.
And please note also that the connection type is SW RF (Socket Weld Raised Face . While or size 2” and above the type is WN RF (Welding
.
Continu from pr vious p g , th s cond control v lv from P&ID is
PCV- 0 A.
It h s v lv sp cific tion cod V46 .
Op n th v lv sp cific tion
docum nt nd find cod V46 .
From th r , w c n g t following inform tion r l t d with th v lv :
V lv r ting nd nd conn ction is ANSI Cl ss 600 with W lding N ck
RF Fl ng typ
V lv body & bonn t m t ri l is
ASTM A2 6 WCB or WCC
V lv trim m t ri l (plug nd
c g ) is AISI 4 0 or ASTM
A 82-F6
V lv s t m t ri l is ASTM
A 82-F6
Bolting is ASTM A 93-B7 bolt nd
ASTM A 94-2H nut
In addition to previous description, pipe schedule value is an important data also that we can retrieved from pipe specification document. This data is required during control valve calculation.
On piping specification document, at piping section, locate the pipe size where control valve is installed, then look for the pipe schedule information.
For example, PCV-101A is installed in pipe with size 4”.
Look for 4” pipe size from the table, then we can get information that the pipe schedule is SCH 80.
From there. we can convert this pipe schedule to pipe wall thickness, which the data is required during control valve calculation process.
Control valve is the most common final control element in the process control in ustries to manipulate a flowing flui (gas, steam, water, etc) to compensate the loa isturbance an keep the regulate process variable as close as possible to esire set point.
Control valve consist of :
Valve bo y onnet Actuator Positioner
Fisher Actuator (Direct Acting)
Direct Acting Actuator
Reverse Acting Actuator
Definition (ISA)
Control valve definition according to power operated device that modulate the flowrate in a process system.
Valve Body (Globe type)
Size : 1/2 - 4 NPS
Post Guided Plug, Unbalance type
Rating : 150, 300, 600 ASME B16.5
Push down to close plug action
Bonnet
Material options : WCC steel, CF8M (stainless steel), WC9 chrome moly steel, or other material upon request.
Packing
Material option : Single PTFE V-Ring for service temperature up to 450 degF.
For temperature more than 450 degF, choose Graphite material.
Plug (Post Guided)
1 2 3
Plug type is Post Guided and UNBALANCE type. Characteristic option is equal percentage, quick opening, or linear.
NACE compliance option for sour service is available (NACE MR-0175)
Available option rating is : 150,300, and 600 RF/RTJ as per ASME B16.5.
Microtrim
Microtrim is trim for small Cv. Detailed is available in next chapter. Microtrim is available for this valve series.
Available Body Size
Fail open and fail close position is available.
Use with 657 type Actuator will create
Fail Open position.
Use with 667 type Actuator will create
Fail Close position.
Body size is available from 1/2 to 4 NPS : 1/2 (Cv 4.47), 3/4 (Cv 9.00), 1 (Cv 13.2), 1.5 (Cv 28.1), 2 (Cv 53.8), 3 (Cv 114), 4 (Cv 190).
For detail see Fisher Catalog 12 (Page 241-246).
Cavitrol Trim
Cavitrol trim is special trim design to avoid cavitation/flashing. Option for cavitrol trim is not available for this valve series.
With metal seat : Class IV is standard, Class V and VI is optional. With PTFE Composition seating : Class VI.
Whisperflo trim is used to reduce noise created by valve during operation. This option is not available in this valve series.
Flow direction is flow up.
Control Valve definition, reading control valve in P&ID, control valve Manufacturer, trim, actuator, trip valve, positioner, liquid sizing equation, choke flow, cavitation, flashing, gas sizing equation, bench set, accesories, oil and gas industry application, Instrucalc sizing, and design recommendation.
CONTROL VALVE
DESIGN ENGINEERING COMPACT GUIDE
Control Valve -
Design Engineering
Compact Guide is designed to be brief and to the point, covers important topics and good practice in professional work to supercharge your instrumentation & control design engineering skills in more efficient way.