Process Flow Diagram Symbols

This is a schematic process flow diagram of the processes used in a typical oil refinery.
This process flow diagram (PFD) example was redesigned from the Wikimedia Commons file: RefineryFlow.png. [commons.wikimedia.org/ wiki/ File:RefineryFlow.png]
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. [creativecommons.org/ licenses/ by-sa/ 3.0/ deed.en]
"An oil refinery or petroleum refinery is an industrial process plant where crude oil is processed and refined into more useful products such as petroleum naphtha, gasoline, diesel fuel, asphalt base, heating oil, kerosene and liquefied petroleum gas. Oil refineries are typically large, sprawling industrial complexes with extensive piping running throughout, carrying streams of fluids between large chemical processing units. In many ways, oil refineries use much of the technology of, and can be thought of, as types of chemical plants. The crude oil feedstock has typically been processed by an oil production plant. There is usually an oil depot (tank farm) at or near an oil refinery for the storage of incoming crude oil feedstock as well as bulk liquid products.
An oil refinery is considered an essential part of the downstream side of the petroleum industry." [Oil refinery. Wikipedia]
The PFD example "Process flow diagram - Typical oil refinery" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Chemical and Process Engineering solution from the Chemical and Process Engineering area of ConceptDraw Solution Park.

This PFD of jet fuel mercaptan oxidation treating was redrawn from Wikipedia file: ConvLPGMerox.png. [en.wikipedia.org/ wiki/ File:ConvKeroMerox.png]
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported icense. [creativecommons.org/ licenses/ by-sa/ 3.0/ deed.en]
"Merox is an acronym for mercaptan oxidation. It is a proprietary catalytic chemical process developed by UOP used in oil refineries and natural gas processing plants to remove mercaptans from LPG, propane, butanes, light naphthas, kerosene and jet fuel by converting them to liquid hydrocarbon disulfides.
The Merox process requires an alkaline environment which, in some of the process versions, is provided by an aqueous solution of sodium hydroxide (NaOH), a strong base, commonly referred to as caustic. In other versions of the process, the alkalinity is provided by ammonia, which is a weak base.
The catalyst in some versions of the process is a water-soluble liquid. In other versions, the catalyst is impregnated onto charcoal granules.
Processes within oil refineries or natural gas processing plants that remove mercaptans and/ or hydrogen sulfide (H2S) are commonly referred to as sweetening processes because they results in products which no longer have the sour, foul odors of mercaptans and hydrogen sulfide. The liquid hydrocarbon disulfides may remain in the sweetened products, they may be used as part of the refinery or natural gas processing plant fuel, or they may be processed further.
The Merox process is usually more economical than using a catalytic hydrodesulfurization process for much the same purpose." [en.wikipedia.org/ wiki/ Merox]
The process flow diagram (PFD) example "Jet fuel mercaptan oxidation treating" was drawn using the ConceptDraw PRO software extended with the Chemical and Process Engineering solution from the Chemical and Process Engineering area of ConceptDraw Solution Park.

This process flow diagram (PFD) example shows an amine treating system for the removal of gaseous hydrogen sulfide from gas streams. It is used in oil refineries and chemical plants. This PFD sample was redesigned from the Wikimedia Commons file: AmineTreating.png. [commons.wikimedia.org/ wiki/ File:AmineTreating.png]
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. [creativecommons.org/ licenses/ by-sa/ 3.0/ deed.en]
"Amine gas treating, also known as gas sweetening and acid gas removal, refers to a group of processes that use aqueous solutions of various alkylamines (commonly referred to simply as amines) to remove hydrogen sulfide (H2S) and carbon dioxide (CO2) from gases. It is a common unit process used in refineries, and is also used in petrochemical plants, natural gas processing plants and other industries.
Processes within oil refineries or chemical processing plants that remove hydrogen sulfide are referred to as "sweetening" processes because the odor of the processed products is improved by the absence of hydrogen sulfide. An alternative to the use of amines involves membrane technology. Membranes are attractive since no reagents are consumed.
Many different amines are used in gas treating:
Diethanolamine (DEA),
Monoethanolamine (MEA),
Methyldiethanolamine (MDEA),
Diisopropanolamine (DIPA),
Aminoethoxyethanol (Diglycolamine) (DGA).
The most commonly used amines in industrial plants are the alkanolamines DEA, MEA, and MDEA. These amines are also used in many oil refineries to remove sour gases from liquid hydrocarbons such as liquified petroleum gas (LPG)." [Amine gas treating. Wikipedia]
The PFD example "Amine treating unit schematic diagram" was drawn using the ConceptDraw PRO diagramming and vector drawing software extended with the Chemical and Process Engineering solution from the Chemical and Process Engineering area of ConceptDraw Solution Park.

This PFD sample was redesigned from the Wikipedia file: NaturalGasCondensate.png.
"This is a schematic flow diagram of a typical facility for separating and recovering liquid condensate from raw natural gas."
[en.wikipedia.org/ wiki/ File:NaturalGasCondensate.png]
"Natural-gas condensate is a low-density mixture of hydrocarbon liquids that are present as gaseous components in the raw natural gas produced from many natural gas fields. It condenses out of the raw gas if the temperature is reduced to below the hydrocarbon dew point temperature of the raw gas.
The natural gas condensate is also referred to as simply condensate, or gas condensate, or sometimes natural gasoline because it contains hydrocarbons within the gasoline boiling range. Raw natural gas may come from any one of three types of gas wells:
(1) Crude oil wells - Raw natural gas that comes from crude oil wells is called associated gas. This gas can exist separate from the crude oil in the underground formation, or dissolved in the crude oil.
(2) Dry gas wells - These wells typically produce only raw natural gas that does not contain any hydrocarbon liquids. Such gas is called non-associated gas.
(3) Condensate wells - These wells produce raw natural gas along with natural gas liquid. Such gas is also non-associated gas and often referred to as wet gas." [Natural-gas condensate. Wikipedia]
The process flow diagram example "Natural gas condensate - PFD" was drawn using the ConceptDraw PRO software extended with the Chemical and Process Engineering solution from the Chemical and Process Engineering area of ConceptDraw Solution Park.

This process flow diagram (PFD) of a typical crude oil distillation unit as used in petroleum crude oil refineries was redrawn from Wikipedia file: Crude Oil Distillation Unit.png. [en.wikipedia.org/ wiki/ File:Crude_ Oil_ Distillation_ Unit.png]
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. [creativecommons.org/ licenses/ by-sa/ 3.0/ deed.en]
"An oil refinery or petroleum refinery is an industrial process plant where crude oil is processed and refined into more useful products such as petroleum naphtha, gasoline, diesel fuel, asphalt base, heating oil, kerosene and liquefied petroleum gas. Oil refineries are typically large, sprawling industrial complexes with extensive piping running throughout, carrying streams of fluids between large chemical processing units. In many ways, oil refineries use much of the technology of, and can be thought of, as types of chemical plants. The crude oil feedstock has typically been processed by an oil production plant. There is usually an oil depot (tank farm) at or near an oil refinery for the storage of incoming crude oil feedstock as well as bulk liquid products.
An oil refinery is considered an essential part of the midstream side of the petroleum industry." [en.wikipedia.org/ wiki/ Oil_ refinery]
The process flow diagram (PFD) example "Crude oil distillation" was drawn using the ConceptDraw PRO diagramming and vector drawing software extended with the Chemical and Process Engineering solution from the Chemical and Process Engineering area of ConceptDraw Solution Park.

This HR infographics example was designed on the base of flowchart "Hiring Process" from the website of the Idaho Division of Human Resources.
"... hiring process flowchart outlining the steps to fill a vacant position." [dhr.idaho.gov/ hiringprocess.html]
"What is a hiring list and what are they for?
A hiring list consists of applicants who completed and passed the examination for a vacant classified position.
The applicants are ranked on the hiring list in order from highest to lowest score." [dhr.idaho.gov/ PDF%20 documents/ Flowchart/ Hiring%20 List%20 Guidance.pdf]
"Announcements.
Announcing a vacant position benefits the agency by allowing a wide array of applicants the opportunity to compete for job openings, resulting in a more qualified employee. The State Merit System requires all appointments, promotions and separations in the classified service to be based on competence, valid job requirements, and individual performance." [dhr.idaho.gov/ PDF%20 documents/ Flowchart/ Announcement.pdf]
"Conducting A Lawful Employment Interview.
Interviewing prospective employees is one of the most important activities employers do. The employer’s objective of an interview is to determine whether an applicant is suitable for an available position. The interview provides the employer an opportunity to obtain in-depth information about a job applicant’s skills, work history, and employment background for this purpose." [dhr.idaho.gov/ PDF%20 documents/ Flowchart/ Conducting%20 a%20 Lawful%20 Employment%20 Interview.pdf]
"Reference Checks.
References should be checked after a successful interview with a candidate, but before you offer them the position. If after interviewing there are several candidates that are qualified for the position, reference checks are also a way to further distinguish who might best fit within your agency." [dhr.idaho.gov/ PDF%20 documents/ Flowchart/ Reference%20 Checks.pdf]
"Making the job offer.
Before offering the position to your selected candidate, be sure to speak with your HR and fiscal staff. They may have some suggestions for negotiating the starting salary, etc.
Job Offer Letter.
... A job offer letter should be given to the newly hired employee after you have verbally negotiated the terms of employment. This letter confirms the conditions of employment the selected candidate has accepted and gives them information for their first day." [dhr.idaho.gov/ PDF%20 documents/ Flowchart/ Making%20 the%20 job%20 offer.pdf]
"E-verify.
To ensure compliance with the Governor’s Executive Order 2009-10, all
State Agencies are encouraged to participate in E-verify.
E-verify is an internet based system that allows an employer, using information reported on an employee’s Form I-9, to determine the eligibility of that employee to work in the United States.
The E-Verify system is operated by the U.S. Department of Homeland Security in partnership with the Social Security Administration and its use is free of charge to employers." [dhr.idaho.gov/ PDF%20 documents/ Flowchart/ EVerify%20 Statement.pdf]
"New Hire Paperwork.
There are several important forms for the new employee to fill out." [dhr.idaho.gov/ PDF%20 documents/ Flowchart/ New%20 Hire%20 Paperwork.pdf]
"Probationary Period.
All appointments and promotions into classified positions require a probationary period of 1,040 hours
except for peace officers who must serve 2,080 hours.
The probationary period is a working test period to evaluate the work performance of the employee and to determine their suitability for the position." [dhr.idaho.gov/ PDF%20 documents/ Flowchart/ Probationary%20 Period%20 for%20 Hiring%20 Process.pdf]
The HR infographics example "Hiring process workflow" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the HR Flowcharts solution from the Management area of ConceptDraw Solution Park.