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Introduction to Smart-Plant Materials-SMAT

The scope of this article is to take you through a brief introductory view, of the know-how of SMAT (Smart Plant Materials) and the information about the necessary attributes in this software required for piping specification activities.

What is Smart Plant Materials?

Smart plant materials (SMAT) is basically a materials management and administration system for process plants. For example, its main applications are the design, engineering, and construction of processing plants for the chemical, pharmaceutical, and mineral oil industries, and for industrial pipeline construction. The software is developed by Intergraph, currently owned by Hexagon. Because of this, the software is popularly known as Intergraph smart-plant materials or Intergraph smart materials.

SMAT supports materials management for all disciplines, for example:

  • Piping (including Supports)
  • Instrumentation
  • Structural steel equipment (vessels, etc.)

Objectives of Smart-Plant Materials

The main objective of SMAT is to provide continuous support for all processing stages of project management. This includes the pre-project phase of parts and standards specification, design and financial planning, the definition of material requirements, procurement and scheduling, pre-fabrication and installation as well as deadline and cost tracking.

Integration of Smartplant Materials

Smart plant materials can be easily integrated with various well-known 3D piping modeling software packages that are widely used in the design. Some typical examples include:

  • PDS (Plant design system),
  • SP3D (Smart Plant 3D), and
  • AVEVA E3D which makes it a widely used software.

Specification group specialists within the piping department use smart plant materials or SMAT during the proposal and project stage. They are generally a small group confined within the piping department.

They use it to prepare piping specifications with all the materials involved. The whole database required for the preparation of such pipe classes is stored in a separate window in smart plant materials (SMAT), which is regulated by users having specific access to the such window and of course, the Computer Aided Engineers involved. The material requisition generated through SMAT is later sent to procurement for procuring the materials. The overall tracking of material supply status at all stages of the project can be done with a report named “Supply status report” generated through this software.

Identification codes (Ident codes) are also generated through this smart plant materials software. The materials are generated and placed for order with such codes to keep a track of their identification right up to their delivery, storage, and installation at the site.

There are various other standardized reports generated through this software (like materials in various piping specifications (specs), and identification codes (Ident codes in various classes), which can be used at various project stages.

Attributes of SmartPlant Materials

From a piping specification point of view, smart-plant materials have various attributes as depicted in the below figure (Fig. 1).

Attributes of Smart Plant Materials
Fig. 1: Attributes of Smart Plant Materials

To have general know-how about smart-plant materials modules, the following commonly used attributes have been described.

1. Preparation of pipe classes or piping specifications:

To start with the preparation of the pipe class in smart plant materials modules.

  • A reference project pipe class or a standard template pipe class that has already been prepared (such as a pipe class with the same base material, corrosion allowance, and class rating) shall be taken.
  • Then go to window S50.05 “Specification copy”
  • Then fill in the required attributes with the desired name of the class and the class is copied.
  • Once the class is copied, go to window S50.06 “Specification management” and type the class name created in S50.05.
  • On similar lines, S50.07 allows you to copy through multiple specifications.

2. Any particular note to be added in pipe class for a component can be done through the S50.09 attribute “General Notes”.

3. Once the pipe classes have been copied, they can then be viewed in the window S50.06 “Specification Management”. Here the various pipe classes copied for the specific project can be viewed below under column Spec code. Refer to Fig. 2 below.

Smart Plant Materials Specification Management
Fig. 2: SmartPlant Materials Specification Management

4. Generation of pipe classes with the required components:

Once we type a pipe class copied and created as per the above steps in S50.05, we type it under the spec code here in window S50.06. Then the Pipe thickness with schedule, the branch table, the design code used, the design conditions used, the base material, corrosion allowance, the trim (seat material) for the valves, the flange rating, and the finish can all be added for the desired class.

Once this is done, we double-click under the spec code for the desired pipe class and then start preparing the class by adding the various components in the below window “S50.06 Window 2” (Fig. 3)

Preparing the Piping class in Smart plant materials
Fig. 3: Preparing the Piping class in Smart plant materials

The bulk components such as pipes, fittings, flanges, spectacle discs, blind and spacer blinds, bolts, gaskets, and valves are inserted in the pipe class through a commodity code. The commodity code is where the description for the component is present.

The components/commodity code is then added as per the short code, group code, option code (which can be customized), and sizes.

The commodity code for the components can be created in the common database (only specific users would have access) in Windows S30.01. One such commodity code can be viewed with its description in the window as shown below in Fig. 4:

Commodity code in SMAT
Fig. 4: Commodity code in SMAT

Once the components are inserted in the class as per the contractual requirements / ITB, and Licensor specification, the class can be checked, locked, or issued as in window “S50.06”.

Once locked, the various reports from SMAT are downloaded.

One particular report is where the idents (Identification codes) as mentioned earlier are automatically generated by the software for each commodity code size-wise. For the bulk components, excluding valves, the identification codes are generated with respect to the pipe thickness and geometry present in the database for the relevant thickness, for the bulk valves they are generated separately, linked to the geometrics present in the respective database for the valves as per the relevant standards.

The other report is the pipe specification (prepared as per previous steps) in pdf format which can be downloaded, checked, and further issued to the Client. This report itself can also be customized with the help of software technical support.

The required geometric data for each component is extracted from the common database.

This SMAT software is linked to modeling software such as PDS, SP3D, and E3D, and hence the components can be properly modeled using these geometrics which is already defined per the ASME standards.

5. Window S50.13:

This window in smart-plant materials gives an overall view of the different piping specifications involved in the project and their status (Issued or Revised). Once the piping specification is issued (locked), it can be revised using the revised command.

6. Window S80 Ident management:

The overall identification codes management is done in the window Ident management. This is used during various cycles of the EPC project wherein; the identification codes may not be created or present for a particular component for procurement purposes.

It can well be generated here. It is linked to the common database where the dimensions of components are present as per the ASTM standards.

If at all for a particular size of the component, the identification cannot be created because the geometric was not present. Then in such case, the user (having access to the database) can insert dimensions as required respecting the ASTM standards and link it to the geometric of the component after which the identification code can be prepared.

7. This software also aids the piping material engineers in generating various reports for checks before material requisition. The material requisition report generated through this software is further attached to the purchase specification which is required to place the Purchase order.

Caesar II Version 13 is Releasing! Take a Look at the Extended Capabilities it will Provide

Most of you are aware that the new version of the most popular stress analysis software Caesar II version 13 is releasing on 08/11/2022 as they mentioned in their dashboard on the Latest CAESAR II Version Information. As we all know there will be some major changes in caesar II version 13 due to the addition of ASME B31.3-2020 edition. Due to the deletion of Appendix D ASME B31.3-2020, the use of B31J/FEA will be mandatory for SIF values. All of these will be incorporated in the latest Caesar II Version 13 release along with many other updates. Let’s learn some of the new updates that we will be getting in Caesar II Version 13.

Caesar II Version 13
Caesar II Version 13

Similar to all new caesar ii software versions, the latest Caesar II, version 13 will also deliver new and extended capabilities to meet the current market requirements following the latest codes. Some updates are also performed based on the feedback received from the Caesar II software user community.

Changes with respect to SIF calculation / Use of ASME B31J

To calculate the stress intensification factors (i-Factors) and flexibility factors (k-Factors) as per the 2020 editions of the ASME B31.1, B31.3, and B31.9 piping codes, support for ASME B31J – 2017 is added. Now, these factors will be calculated following the philosophy and equations mentioned in the ASME B31J-2017 code.

The ASME B31J SIFs and flexibilities are integrated into the software. The integration is made into static analysis, miscellaneous reports, and a configuration editor. The option to include the default values used in calculations when input values are outside of allowed B3J ranges is also provided. Additionally, the supports for the optional use of B31J with other metallic piping codes are also added.

The outdated calculation modules which were present in earlier versions of Caesar II for the calculation of SIFs at Intersections and Bends are removed and now replaced by the new B31J integration. To help the users regarding some technical aspects of ASME B31J, B31J methods are also added in the technical discussion of the caesar ii help.

Updates with respect to Codes and Standards

Most of the old piping codes are updated to the latest code editions. Some of the code/standard editions that the Caesar II version 13 will support are:

  • ASME B31.1 (power piping) – 2020 edition.
  • ASME B31.3 and B31.3 Chapter IX (process piping) – 2020 edition.
  • ASME B31.8 and B31.8 Chapter VIII (gas transmission & distribution) – 2020 edition.
  • ASME B31.9 (building services) – 2017 and 2020 editions.
  • ASME B31.5 (refrigeration piping & heat transfer) – 2019 edition.
  • National Building Code of Canada-2015 edition – Wind and Seismic.
  • International Building Code (IBC)-2018 edition – Wind and Seismic.
  • API 610 (Centrifugal Pumps) to the 12th edition, January 2021.

Additionally, Caesar II version 13 will support multiple piping code editions. This means the latest software will support both the CAESAR II version 12 code editions and the new editions added to version 13. A detailed dialog will display explaining the code edition changes that occur when one opens and saves a job file created in an earlier software version.

Caesar II Version 13 updates with respect to Material and Content

The material database has been updated with the

  • materials required for the ASME B31.3 2020 edition.
  • materials required for the ASME B31.9 2017 edition.
  • materials required for ASME Section VIII 2021 edition.

Moreover, the new Caesar II software will have spring sizes 000, 00, 23, and 24 for the VSS, VSM, and VSL springs to the Unison hanger tables. Also added the new extended working range VST and VSQ springs.
Pipe Support Systems GmbH International (PSSI) spring hangers catalog is updated to the 2010 edition

Support for the UK 1996 structural database, including British square hollow sections (SHS) and updated T shapes (TUB and TUC) has been included.
The complete flange database for EN 1092 has been implemented.

Caesar II, Ver 13 changes with respect to the Main Window

The monthly checks of software updates and the outdated version warning dialogs have been removed as the latest version will be visible on the news channel of the Main Window itself.

The link to Smart Support has been updated.

Required clarification notes while selecting materials from the Material Database Editor based on multiple code editions are added.

New Caesar II Version 13 changes with respect to Piping Input

To simplify the modeling of spring cans, the spring Can modeling with Friction Builder is added. It has two options; a simple design or a comprehensive design. This gives the user control over the level of design details.

The materials that are not supported by the selected code will now display with an asterisk to the materials.

Other updates in Version 13 of caesar II software

Some other notable changes are

  • To adjust the fluid density for each load case (when required), a Fluid Density Multiplier (FDM) is added to the Static Load Case Editor. A Help related to the use of FDM is included in the technical discussion.
  • The ASME B31.3 minimum design metal temperature (MDMT) stress type is also added to the Static Load Case Editor.
  • Clarified the definition of Load Cycles, cyclic stress range reduction factors, and associated properties.

I hope the above points will give you a general idea of the major updates/changes that we will see in the latest version of Caesar II, Version 13.

References

  • https://docs.hexagonppm.com/r/en-US/CAESAR-II-Quick-Reference/Version-13/360525

What is Girth Welding? Pipeline Girth Welding

If you are a pipeline engineer, you must be familiar with the term girth welding. Yes, you are right. Line pipes (API 5L) used in the pipeline industry are generally joined together using girth welding. In this article, we will explore more about the girth welding process. So, let’s start with the definition of girth welding.

What is Girth Welding?

Girth welding is the process of connecting two pipes by welding around their circumference. As the welding is done around the pipe circumferences, girth welding is also popular as circumferential welding. Several welding passes are required to create a proper weld joint. The most widespread application of girth weld is found to join pipe and pipeline networks for aboveground and underground applications. The ease of welding and environmental factors must be considered while selecting the girth weld process as the preferred welding method.

Girth Welding Passes

In general, there are a minimum of three welding passes, that welding operators employ while performing girth welding. They are:

  • Root Pass or Stringer Bead- The root pass of girth welding is the most difficult welding pass as the welding process needs a specific speed for improved reliability.
  • Hot Pass- This process increases the welding thickness of the root pass.
  • Fill and Cap Pass- This is the final welding pass that completes the girth weld joint.

Girth Welding Methods

The most common methods employed for the girth welding process are:

  • Manual arc welding: SMAW and GTAW are the usual MAC methods.
  • Semi-automatic arc welding: SAW (Submerged arc welding), FCAW (Flux-cored Arc Welding), and GMAW (Gas Metal Arc Welding) are the common ones.
  • Automatic arc welding: Flash-butt welding, friction welding, and Laser-beam welding are mostly used.

Selection of Girth Welding

The proper selection of welding methods and standards for circumferential girth welding depends on various parameters as listed below:

  • The pipe manufacturing process employed
  • The strength of the base pipe material
  • Pipe diameter and wall thickness
  • External conditions
  • Environmental factors
  • Length and cost of the pipeline
  • Terrain
  • Skills of Welder
  • Welding location
  • Weldment properties
  • Welding Economics
  • The direction of weld travel (uphill or downhill)
  • Ease of implementation
  • Weldability of the pipe
Girth Welding
Girth Welding

Girth Welding for Pipeline Tie-ins

An important use of the girth welding method is in the form of pipeline/piping Tie-in connections. This is a key aspect of girth welding. Tie-in pipeline connection usually means the connection of a pipeline with the facility of other existing piping networks. Sometimes, It also refers to the connections between different sections within the same pipeline.

As most of the pipeline tie-in welding connections are carried out within trenches at the work site, the use of new equipment is not practical. Hence, to create a weld joint between two completed piping sections, the alignment, preparation, and accuracy level must be well planned to get reliable and strong girth weld joints.

Repair welding and mainline welding also call for various girth welding methods like Shielded metal arc welding, Flux-cored arc welding, Gas tungsten arc welding, Submerged arc welding, Gas metal arc welding, etc. The detailed pipeline welding methods can be accessed from here.

In recent times, various automatic girth welding machines are developed which makes the girth welding process efficient with less effort. Even automatic welding robots are also developed. Girth welding can also be used for welding tanks. Automatic girth welding machines produce reliable welds with precise control of the process.

The girth seam welds are usually classified into the following two categories: Vertical circumferential seam and Horizontal girth seam.

Video Courses in Welding

To learn more about welding the following video courses you can refer to:

What is CNG? Its Properties, Uses, Origin, Composition, & CNG Process

We daily hear the word CNG! We know CNG is a type of fuel that powers our vehicles and is also an alternative to diesel and petrol. But we really don’t know anything beyond it. In this article, we dig a little deeper and try to understand what CNG is, why it is used, how it is obtained, and what its benefits are.

We try to look from a common man’s perspective and not from a technical angle. Keeping this in mind, I have tried to keep this article very simple and non-technical for common readers. Even a technical person will find this article very useful. So let us get started…

What is CNG?

CNG gas in full form is Compressed Natural Gas. It is a type of natural gas that is compressed under tremendous pressure. Some of the important physical characteristics of CNG are

  • Odorless
  • Colorless and
  • Non Corrosive   

Just like other fossil fuels like coal and oil, CNG is formed when decaying plants and animals which are buried under the earth’s surface interact with intense heat and pressure for millions of years.

Two main reasons why CNG is replacing traditional fossil fuels like petrol and diesel are

  1. CNG is a lot greener than diesel and petrol. Hence it emits very less carbon and other greenhouse gas. It reduces carbon monoxide emissions by 90% to 97%. It reduces environmental pollution significantly. So it is very eco-friendly. 
  2. CNG is cheaper than petrol and diesel which makes it affordable for the common masses.  It is also very efficient and easy to use. 

It will come to you as a surprise that 98% of natural gas comes from North America.

Origins of CNG

In the mid-eighteenth century, experiments with CNG began. However, in the 1930s, automakers started experimenting with methane gas in their industry. In the 1960s, Columbia Natural Gas of Ohio tried a CNG carrier. The ship was supposed to transport compressed natural gas in vertical pressure columns but the pressure vessels were too expensive. Therefore it was abandoned.

After the 1990s many developing countries around the world like Iran, Brazil, Argentina, China, etc started using CNG for their vehicles. Most of the cars in these countries are powered by CNG. This led to an increase in CNG demand.

However, since 2008, the market for natural gas like CNG and LPG has really grown substantially. The main reason for this growth is increased petroleum prices and the desire to reduce carbon emissions.  

You can imagine right now there are over 10 million natural gas-powered vehicles and more than 15,000 CNG refueling stations in 75 different countries.

Properties of CNG

We talked about some of the properties of CNG earlier. But here we shall see them in great detail.

  • The state of the CNG is gaseous and it is an odorless, colorless, and tasteless gas. However, a chemical called methyl mercaptan is added to detect gas leaks.  
  • It is a highly combustible gas and a fossil fuel. It has a low flammability range and high ignition temperature.  
  • CNG is a mixture of simple hydrocarbon compounds especially Methane (CH4) with small amounts of ethane, butane, pentane, and propane.
  • The gas has a high calorific value because it is free of any kind of toxicity.  
  • The byproducts of CNG after burning are water vapor and carbon dioxide.
  • CNG and other natural gases are 60% lighter than air.
  • Natural gas is found in rocks beneath the earth’s surface.
  • Natural gas can be stored and transported through pipelines.

These were some of the main properties of CNG.

What CNG is Comprised of?

If we go beyond the physical appearance of CNG, we need to know what it is comprised of. I mean to say its chemical composition.

CNG is found in a gaseous state and consists of about 90% to 95% methane or CH4. The remaining 5% to 10% consists of nitrogen, carbon dioxide, helium, or hydrogen sulfide. Unlike LPG (Liquefied Petroleum Gas) which is a liquid comprised of propane and butane. 

CNG is a natural gas that is compressed under great pressure so that it occupies a lesser volume in your fuel tank or fuel storage. CNG is compressed to a pressure of 200 to 500 kg/cm square or in other countries it can be 3600 pounds per square inch. In the compressed form, CNG occupies less than 1% of its volume at atmospheric pressure.

Although most of the vehicles can use natural gas in liquid as well as gaseous form but most vehicles use in gaseous form compressed to 3000 psi. CNG has an energy density of 53.6 MJ/Kg or 9 MJ/L.

Uses of CNG

CNG is used for both residential as well industrial purposes. Some of its uses are

  • As you already know CNG is widely used by the transportation sector for powering cars, trains, ships, and other vehicles.
  • The gas is used by end consumers for cooking and heating.
  • Dryers use CNG for drying clothes. It is 50% more cost-effective than electricity.
  • Some countries also use CNG for generating electricity.
  • Manufacturing a huge range of chemicals like acetic acid, ammonia, methanol, butane, propane, ethane, etc. Even fertilizers are made using CNG.
  • It is heavily used as chemical feedstock for manufacturing plastic and other commercially important organic chemicals.
  • CNG is used in the production of glass, fabric, steel, paint, etc.
  • Protein-rich animal and fish feed is produced by feeding CNG.

CNG has applications in both industrial as well as in the home but it is primarily used for transportation.

CNG Process

Generally, a typical CNG process includes 4 phases.

Phase 1: Production

A typical CNG production facility depends upon the quality of the natural gas and reservoir pressure. The production process consists of compression, cooling, dehydration, and most likely Liquefied Petroleum Gas (LPG) separation.

The extent of compression and cooling is going to differ from process to process. 

Phase 2: Transportation

There are various CNG transportation processes that have emerged over the years. Some of them are

Coselle CNG Carrier – Creating a large but compact CNG storage with a pipe. It consists of several miles of small diameter pipe coiled into a carousel.

Volume Optimized Transport and Storage – It consists of long and large diameter pipes encased in an insulated shell.

Coiled Pipeline Carrier – It uses a coiled pipeline configuration.

Two other transportation processes are Gas Transport Modules and Pressurized Natural Gas Concept.  

Phase 3: Receiving

In the receiving phase, the CNG ship unloads gas into the pipeline at the receiving terminal. The receiving terminal will have a dock with high-pressure pipeline connections and an expander to recover energy from the high-pressure gas. 

Phase 4: Storage

Storage is required at the production and receiving terminal to maintain uninterrupted operation. The CNG can be stored in the ship docked at the port.

These were 4 simple phases or processes involved in CNG generation. I have tried to explain it in a non-technical manner so everyone can understand it easily.

Advantages & Disadvantages of CNG

To sum up this article I will give you both sides of the picture.

Advantages

  • The most significant advantage of CNG is it is environment friendly and emits very low carbon. The numbers of pollutants released are far less than petrol and diesel. It means less greenhouse gas or CO2 emissions. 
  • Natural gas-powered vehicles have lower costs of maintenance compared to petrol and diesel-powered vehicles. This means consumers save a lot of money.
  • In the event of a leak, the potential damage caused by CNG is far less than by other energy sources.
  • CNG-powered vehicles produce less noise as compared to diesel vehicles.
  • Women in remote villages in India live longer because of CNG. CNG is a clean fuel because it emits no smoke on the other hand wood and coal emit a lot of black smoke.

Disadvantages

  • CNG demands more fuel storage space than petrol or diesel-powered vehicles.
  • CNG from production to distribution emits a lot of greenhouse gas. So it is not that eco-friendly.
  • The leak of methane gas can cause serious environmental damage.
  • Most importantly, CNG has less energy density and power output than diesel or petrol vehicles.

I hope after reading this article you will get a clear idea of what CNG is, its properties, usage, and development process.

Differences Between ASTM A312 and ASTM A358: A358 vs A312

Both A312 and A358 are stainless steel materials with ASTM designation having very good corrosion resistance. They are widely used materials for the piping and pipeline industry. In this article, we will find out the basic differences between ASTM A312 and ASTM A358.

What is ASTM A312?

ASTM A312 or SA 312 is an American Standard material specification that covers seamless, welded, and heavily cold-worked austenitic stainless steel pipe. In general A312 pipes are intended for high-temperature and general corrosive service. 304/304L Stainless Steel and 316/316L Stainless Steel are the most widely used grade of A312 specification.

What is ASTM A358?

ASTM A358 or SA 358 is a material specification for electric-fusion-welded austenitic chromium-nickel stainless steel pipe. A358 stainless steel materials are widely used in high-temperature and or corrosive service industrial applications.

Applications of A312 and A358

As stainless steel pipes of Specification A312 and A358 are corrosion resistant, they find wide applications in harsh conditions. In corrosive environments, both A358 and A312 proved their durability. Additionally, They have good low-temperature resistance capability. Because of all these, the popular industries that use A312 and/or A358 materials are:

  • Chemical, Petrochemical
  • Mining
  • Food and beverage
  • Oil and gas
  • Marine
  • Pharmaceutical
  • Power generation
  • Renewable energy

A312 vs A358: Differences

Even though both A312 and A358 represent Stainless Steel materials for piping and pipeline industries having similar compositions and applications, there are some differences between the two alloys. The following table lists the major differences between ASTM A358 and ASTM A312.

ASTM A312ASTM A358
ASTM A312 materials are manufactured by Seamless without welding, Automatic Welding without filler material, or heavy cold working.ASTM A358 materials are manufactured by fusion welding using single-welded or double-welded butt joints.
A312 materials have different grades and no sub-classes.Depending on the type of welding, filler material requirement, and radiographic requirements they have 5 sub-classes within A358. They are designated as class 1 to class 5 and must be mentioned while ordering.
A312 material conforms to the requirements furnished in Specification A999While A358 SS pipes conform to the requirements provided in A240.
Seamless A312 SS pipes are usually costly.A358 pipes are usually cheaper.
In general A312 pipes are manufactured for a size up to 30 inchesA358 pipes are usually manufactured up to a size of 48 inches
Table: A358 vs A312

What is a Progressive Cavity Pump? Its Working, Design, and Applications

A progressive cavity pump is a positive displacement type pump mainly used for handling high-viscous fluids and tough pumping applications. They are also known as cavity pumps, progressing cavity pumps, PC Pumps, progg cavity pumps, progressive cavity screw pumps, or eccentric screw pumps. As the pump transfers fluids by means of the progress of fixed discrete cavities through the pump when the rotor turns, it is known as a progressive cavity pump. It is a versatile pump having various applications to handle abrasive, high-viscous fluids. In this article, we will learn the working, design, applications, advantages, and disadvantages of a Progressive Cavity Pump.

Working of a Progressive Cavity Pump

Progressive cavity pumps consist of a helical rotor and a twin helix stator. The pumping fluid enters the pump through the inlet suction nozzle. The fluid is then fed into a long casing having the helical rotor and stator assembly. When the rotor turns and contacts the stator surface, a series of small cavities are generated in between. The pumping fluid is progressed through these cavities and is finally expelled through the outlet. The sealed cavities are the main cause of the transfer of the fluid.

Progressive cavity pumps are not allowed to run dry as the heat generated by the rotor and stator may cause pump failure. They are self-priming pumps with higher pressure per stage and high suction lift. The working theory of progressive cavity pumps is invented by René Moineau, a pioneer of aviation, in 1930.

Design of Progressive Cavity Pumps

The rotors of the PC pump are usually made of Steel with a smooth hard surface coating and the stator is usually made of a molded elastomer inside a metal tube body. The complex cavities are formed in the elastomer core of the stator. Angled link arms and bearings allow the rotor to roll around the inner surface of the stator. There are two designs of stators in a cavity pump. They are equal-walled and unequal-walled. The unequal-walled stator design has a greater elastomer wall thickness at the peaks. Because of the increased ability of the stator to distort under pressure, the large-sized solids can pass through the unequal-walled designs.

Typical Progressive Cavity Pump
Fig. 1: Typical Progressive Cavity Pump

Other pump components like pump body, joints, driver, coupling, connecting rod, bearing, packing, sealing, etc are common for all types of pumps.

Applications of Progressive Cavity Pumps

Progressing cavity pumps are used in a range of industries specifically for handling high-viscous fluids and slurries. Some of the common applications of PC pumps are:

  • Sewage and sludge pumping
  • Oil pumping
  • Grout or cement pumping
  • Food and drink pumping
  • Coal slurry pumping
  • Limited energy well water pumping
  • Mining slurry pumping
  • Viscous chemical pumping
  • Stormflow screening
  • Transferring paint, varnish
  • Oilfield directional drilling
  • Pumping cosmetics, creams, and lotions
  • Marine diesel fuel pumping
  • Lubrication oil pumping
  • Transferring shear-sensitive fruits and vegetables

Specifically, they are used for the purpose of pumping, dosing, and metering chemicals, shear-sensitive materials, and heavy-viscous fluids. The industries that make frequent use of progressive cavity pumps are:

  • Wastewater industry
  • Oil Lubrication industry
  • Chemical manufacturing industry
  • Cement industry
  • Sewage treatment plants
  • Food and Beverage industries
  • Pulp and Paper industries
  • Oil Drilling Industries
  • Petroleum production, etc

Advantages of Progressive Cavity Pumps

Progressive cavity pumps have several advantages like

  • They are suitable for solids and other difficult mediums.
  • They can easily handle multi-phase fluids, air-entrained fluids, and abrasive fluids.
  • They provide good precision in dosing.
  • PC pumps can provide continuous, gentle, and low pulsation flow.
  • They are self-priming
  • They do not create vapor locks.
  • They have a high suction capability.
  • Accurate to act as a metering pump.
  • Reverse rotation and flow are possible.
  • Quiet operation.
  • PC pumps can be operated vertically.

Disadvantages of Progressive Cavity Pumps

However, there are certain drawbacks of Progressive cavity pumps. The main disadvantages of Progressing cavity pumps are

  • PC pumps can not run dry. They need a lubricating fluid film for their operation.
  • They usually are slow-moving with less flow amount.
  • Their pumping capacity is limited. They can pump up to a limited distance.
  • When slippage occurs between the rotor and the stator, the efficiency considerably decreases.

FAQs of Progressive Cavity Pumps

Is the progressive cavity pump the same as the screw pump?

A screw pump also has rotors and is quite similar to PC pumps. But the main difference between a screw pump and progressing cavity pump is the application. While screw pumps are used specifically for nonabrasive fluids, Cavity pumps are used mainly for abrasive fluids, slurries, etc.

Can progressive cavity pumps pump water?

Progressive cavity pumps are normally used for sheer sensitive and highly viscous liquids like slurries. For less viscous liquids like water, PC pumps are usually not used.

Are progressive cavity pumps reversible?

yes, progressive cavity pumps can operate in either direction with equal efficiency.

Can the progressive cavity pump run dry?

No, Progressive Cavity Pumps cannot be run dry. If it is run dry then the heat generated will damage the stator. That is why dry-run protection devices like stator temperature probes are used.

How do you prime a progressive cavity pump?

PC pumps are usually self-priming pumps. The Priming of cavity pumps can be done by filling the pump with the medium to be transferred. Priming of pumps is essential for proper lubrication of the rubber stator.