One of the most common questions being asked at the Cloud Foundry Summit last week in my appearance on The Cube here, for example was a predictable one: what about Kubernetes? The seriousness and intent of the question varied: some were genuinely curious as to how the two projects conflict and coexist. Others used the question as a rhetorical mechanism a dig, in most cases.
Before we get to that, its worth revisiting the history of the projects briefly. Cloud Foundry, first released publicly in 2011, was a project that served a functional role similar to traditional middleware. Where the former served as an abstraction layer in between Java applications and the underlying hardware and operating system they ran on, Cloud Foundry was a multi-runtime bridge to and between on and off premise cloud environments.
Significantly, it predated the explosion in popularity of an older virtualization-like technology, which arrived in 2013 with the emergence of a developer-friendly package of container technologies in Docker.
Docker, as RedMonk has observed previously, was a technology that grew at a rate we hadnt seen before. Within a year of its release it was showing up regularly in briefings; within two, it was in most briefings, even those whose connection to container technologies was tenuous at best. We call this practice Docker-washing.
While Cloud Foundry has a much broader functional mandate than a standard Docker container, questions about the relationship between the two were immediately raised. Docker was an immensely popular technology amongst developers, while Cloud Foundrys strength historically has been more towards the operations end of the spectrum. And like employees that want to bring their iPhones to work, developers increasingly sought a means for bringing their containers from their workstation through to production.
Cloud Foundrys messaging around containers was less than clear and at times contradictory, but via projects like Diego it was clearly responding to accelerating demand for containers in a Cloud Foundry context. It took a few years, however, for that to become the default approach. In the meantime, other players were targeting that same demand, the most notable of which was Google.
In June of 2014, the search giant and would-be cloud provider made Kubernetes available. Google was at the time, and likely still is, the largest container-based environment in the world. At Google, containers were managed by an internal management system called Borg. This was unique to Googles environment, however, so rather than try and adapt it to make it more generic some of its authors created a new container orchestration platform. Like many later popular technologies VMware comes to mind it was frequently dismissed as a toy and, on one occasion, a watered down version of a real container management system.
In the last eighteen months, due to a number of factors, Kubernetes has exploded as a project; here are some numbers from my colleague on the subject. Kubernetes was a project with an interesting pedigree but uncertain future two years ago; today its path is clear. Its becoming the default for container-centric workloads for many vendors we speak with, and is seeing a commensurate spike in commercialization (e.g. Heptio), governance (CNCF) and investment (Istio). Gone are the claims, in other words, that Kubernetes is a toy.
There are many potential answers to this question, but in the short to medium term it seems probable that the best is: different tools for different jobs. Its true that Cloud Foundry and Kubernetes have substantial functional overlap. Its also true that that this is likely to increase rather than decrease. But they remain differentiated in approach, audience and opinons.
Kubernetes is, by design and definition, container-centric in its approach. It is described by one of its founders as fundamentally a tool box. Cloud Foundry, by contrast, container abilities like Diego notwihstanding, is application-centric. It is more production line than toolbox, in a sense. These approaches are neither mutually exclusive or inclusive, and indeed can and often are leveraged by different business units within the same organization depending on need.
The problem with the Cloud Foundry and Kubernetes conversation, then, isnt the question of how the projects compare to one another. Its the common and reductive assumption that there can be only one. The implicit assertion that Cloud Foundry and Kubernetes are the only two variables in a zero sum equation ignores both the differences between the two projects and the wider market context. Even if we assumed, counterfactually at present, that one of the two approaches could satisfy both projects audiences, there remains a large and growing number of other options which are neither app nor container-centric, with the function-centric serverless being perhaps the most obvious.
Its difficult to compare programming languages and platforms, of course, but this was the analogy that most frequently came to mind last week. Cloud Foundry is unlikely to be as popular as it was shortly after it launched, when it was the only open source PaaS platform available. But this says little about Cloud Foundry, and more about the platform market which like every other infrastructure market is exploding with choice to the point of being problematic. It also ignores the ability for the Cloud Foundry foundation to actively embrace this choice via the addition of Kubo.
Foxconn, the Chinese contract manufacturer, has admitted it's "not perfect" and promised to investigate conditions at its Tai Yuan plant after an undercover expos by an undercover reporter revealed filthy dorms and bullying by managers on the iPhone 5 production line.
The hack then got to start work on the production line but lasted just three days due to the repetitive, exhausting nature of the work marking five iPhone 5 back plates with a paint pen every minute for seven straight hours at a time.
He said he was frequently scolded on the production line, effectively forced into extra over-time andwitnessed a colleague being forced to stand in the corner by a manager as punishment for resting on the job.
Foxconn has issued a lengthy statement in response, claiming to offer its one million-plus employees in China a safe and positive working environment and compensation and benefits that significantly exceed government-mandated rates and that are competitive with all of our industry peers in each location where we operate.
"We also work hard together with the local government and third parties to provide housing, dining, recreational and other facilities that meet the needs of our employees and we are committed to a process of continuous improvement in those and other benefits.
We do this to ensure that we continue to attract the best workers in the industry. Foxconn is not perfect, but we are making progress everyday and we continue to lead our industry in meeting the needs of the new generation of workers in China. Anything, such as the report in question, that indicates that the high standards set by our company are not being followed is immediately investigated and addressed."
The iPhone-maker, which also produces kit for Nokia, HP, Dell and other big tech names, has been the subject of intense media scrutiny this year after several damning reports from not-for-profit groups highlighted serious labour rights violations at some of its plants.
This led to its landmark agreement with Apple and the Fair Labor Association in March after the FLA conducted audits of three plants in Guanlan, Longhua, and Chengdu and the most recent update from the FLA has been encouraging.
A human-free autonomous boat known as the Saildrone Surveyor has successfully sailed from San Francisco to Hawaii to cross the Pacific Ocean while mapping the topography of the seabed, an achievement made less than a month after a similar IBM-powered boat failed.
The Saildrone Surveyor, 22 metres long and and weighing 12,700 kilograms, sailed 2,250 nautical miles over 28 days to map 6,400 nautical miles of seafloor. The project is the largest attempt yet to map Earth's undersea landscape; we have mapped the Moon more than our planet's deep oceans.
Scientists have discovered fossilised insect wings which suggest the flying creatures they belong to may have been communicating 310 million years ago 50 million years before the first known insect comms.
Discovered in Livin, France, the fossils offer the earliest known evidence of wing-based communication in insects and suggest bugs may have been using their wings to broadcast information since the Late Carboniferous period, around 310 million years ago.
Andr Nel, professor at the Musum national d'Histoire naturelle in Paris, and his team found the fossil belonging to a previously unidentified species of giant predatory grasshopper-like insects called Titanoptera the largest of which had wingspans of more than 33cm. The team called the new find Theiatitan Azari, in tribute to Theia, the Greek Titan goddess of light.
US President Joseph Biden on Friday signed a sweeping executive order directing government agencies to take steps intended to enhance economic competition and prevent anticompetitive practices, among the tech industry as well as others.
The Executive Order on Promoting Competition in the American Economy includes 72 initiatives addressed to more than a dozen government agencies, several of which aim to curtail the market dominance of tech giants.
"For decades, corporate consolidation has been accelerating," the White House said in a statement. "In over 75 per cent of US industries, a smaller number of large companies now control more of the business than they did twenty years ago. This is true across healthcare, financial services, agriculture and more."
Oracle is seeking more than $7m in damages from long-time software partner NEC Corporation of America (NECAM) a subsidiary of tech Japan-based tech giant NEC Corp over a complaint about copyright and breach of contract.
Chip giant Taiwan Semiconductor Manufacturing Co has seen quarterly revenue hit NT$372.1bn ($13.3bn), nearly 20 per cent up from a year earlier as the manufacturer struggles to cope with mountainous demand in the pandemic recovery.
The chip giant releases monthly revenue figures which have been collated by The Register and other outlets, including Bloomberg. TSMC will host a second quarter 2021 earnings conference on Thursday next week - July 15. The firm is currently in a quiet period.
The last Shuttle to launch was Atlantis on STS-135, the 135th mission in the Space Shuttle programme. The vehicle left pad 39A at 15:29 UTC on 8 July and was crewed by four astronauts, reflecting STS-135's original status as the rescue mission for Endeavour's STS-134.
We know how much most of you Reg readers enjoy a full English breakfast. The crispy saltiness of the bacon. The savoury runniness of the fried egg. The soft sweetness of the baked beans. A proper full English fry-up is a work of culinary art when done well.
Can you just chuck everything in together, or do you need to cook in stages according to cooking times for each piece? How long should you cook the mushrooms for? Do they go in before or after the eggs? You only only get one shot at this and you don't want to mess it up, because a ruined breakfast is not an option.
In good news for Brits concerned about hitting roaming caps the next time they visit the EU, the UK has sorted out that particular issue in a post-Brexit trade deal with Norway, Iceland, and, er, Liechtenstein.
According to a statement, the acquisition will "extend IBM's container strategy and implementation services portfolio to further advance IBM's hybrid cloud strategy and accelerate Red Hat OpenShift adoption globally."
Interview Greg Kurtzer, co-founder of CentOS and founder of Rocky Linux, has told The Register that despite the "negative effect" around the end of CentOS 8, he now believes that the focus on CentOS Stream is better for the community.
The Harlow branch of flick-flinger Cineworld is the scene of today's unfortunate events, as a screen which would normally show what treats are in store for customers is instead displaying the End of Days for an unfortunate Windows application.
A centralized DevOps platform is an inseparable part of modern software development. It helps companies achieve fast, cost-efficient and automated software production. The first step in building a centralized platform is to start enhancing the overall robustness of your in-house system.
System robustness is achieved by eliminating single points of failure in the system that would prevent successful transition. Often, the points of failure are related to people, technologies, tools or documentation. In this blogpost, I will guide you through the first step on how your company can start building a centralized platform like Eficode ROOT.
When I say robustness is the starting point of building a DevOps platform, what Im mean is that there are some foundational elements you need to have place in your culture and processes in order to build a viable infrastructure for your platform. The aspects of this foundation we will run through here are comms channels, semi-automatic documentation, and extensive use of version control.
Traditional channels such as email are exclusive. A sender selects the group of recipients and those who are left out miss that information even though it may be relevant to them. In that sense, email necessarily creates silos and makes the system less robust.
A robust system requires transparency and seamless communication. Its ironic that many companies aiming for modern and fast software development are still using slow and outdated communication channels.
Inclusive communication channels, like Slack or Flowdock allow fast, real-time distribution of information and allow features that are not possible in traditional email chains. You can add all involved parties to channels, like team members, customers and partners. One of the most important features is that people can join and leave the channels when needed. Switching to inclusive communication channels ensures transparency within the company and keeps people up-to-date.
Information related to a project needs be documented and contained by the platform, as information belongs to the whole team. All critical project information should documented in the project management or ticketing system, such as Jira.
The benefit here is that if all key information is in project management systems and version control, not much needs to be separately documented: only high-level targets, architectural diagrams, and suchlike. Most key information is documented organically during the processes themselves.
By controlling all changes, you will always have up-to-date visibility to the system state. By doing this, in case of a failure, you will be able to trace possible problems efficiently and get rollbacks if you need to return to the previous stage.
In order to implement changes successfully, you shouldnt do code any changes directly in the environments. In fact, no changes should be done in a way that bypasses version control, including changes to the application code, middleware and environment configurations.
I wrote a piece recently about why we are all distributed systems engineers now. To my surprise, lots of people objected to the observation that you haveto test large distributed systems in production.
There are lots of things you already test in prodbecause there's no other way you cantest them. Sure, you can spin up clones of various system components or entire systems, and capture real traffic to replayoffline (the gold standard of systems testing).But many systems are too big, complex, and cost-prohibitive to clone.
Imagine trying to spin up a copy of Facebook for testing (with its multiple, globally distributed data centers). Imagine trying to spin up a copy of the national electrical grid. Even if you succeed, nextyou need the same number of clients, the same concurrency, same pipelining and usage patterns, etc.The unpredictability of user traffic makes it impossible to mock; even if you could perfectly reproduce yesterday's traffic, you still can't predict tomorrow's.
It's easy to get dragged down into bikeshedding about cloning environments and miss the real point: Only production is production, and every time you deploy there you are testing a unique combination of deploy code + software + environment. (Just ask anyone who's ever confidently deployed to "Staging", and then "Producktion" (sic).)
You can't spin up a copy of Facebook. You can't spin up a copy of the national power grid. Some things just aren't amenable to cloning. And that's fine. You simply can't usefully mimic the qualities of size and chaos that tease out the long, thin tail of bugs or behaviors you care about.
Facebook doesn't try to spin up a copy of Facebook either. They invest in the tools that allow thousands and thousands of engineers to deploy safely to production every day and observe people interacting with the code they wrote. So does Netflix. So does everyone who is fortunate enough to outgrow the delusion that this is a tractable problem.
There's a lot of value in testing... to a point. But if you can catch 80% to 90% of the bugs with 10% to 20% of the effortand you canthe rest is more usefully poured into making your systems resilient, not preventing failure.
You should be practicing failure regularly. Ideally, everyone who has access to production knows how to do a deploy and rollback, or how to get to a known-good state fast. They should know what a normal operating system looks like, and how to debug basic problems. Knowing how to deal with failure should not be rare.
If you test in production, dealing with failurewon't be rare. I'm talking about things like,"Does this have a memory leak?" Maybe run it as a canary on five hosts overnight and see. "Does this functionality work as planned?" At some point, just ship it with a feature flag so only certain users can exercise it. Stuff like that. Practice shipping and fixing lots of small problems, instead of a few big anddramatic releases.
You're shipping code every day and causing self-inflicted damage on the regular, and you can't tell what it's doing before, during, or after. It's not the breaking stuff that's the problem; you can break things safely. It's the second partnot knowing what it's doingthat's not OK. This bigger problem can be addressed by:
Release engineering is a systematically underinvested skillset at companies with more than 50 people. Your deploys are the cause of nearly all your failures because they inject chaos into your system. Having a staging copy of production is not going to do much to change that (and it adds a large category of problems colloquially known as"it looked just like production, so I just dropped that table...").
Embrace failure. Chaos and failure are your friends. The issue is notif you will fail, it is whenyou will fail, and whether you will notice. It's between whether it will annoy allof your users because the entire site is down, or if it will annoy only a few users until you fix it at your leisure the next morning.
It's a great article, but as it went on it sounded terrifying. I take it this is only for very large businesses that can afford to have staff on-call lots of the time to deal with potential fallout? Or are they beyond that? I'm just trying to wrap my head around at what point my own advice is, or becomes invalid or inadequate. I prefer to work with smaller businesses, so we get to avoid some of the complexities of facebook and national services mostly.
This doesn't say for example, don't test locally, then CI, then use staging. It seems that at a certain point it seems to suggest staging may be impractical for velocity, and end-user validation. Monitoring live is essential (we already agree there), with feature flags taking over some things being "tested", I wonder is this entirely through logging? I suppose the problem is that it's hard to visualise. Facebook might not clone itself, but I'd have a hard time accepting even at their gargantuan scale it's possible to log everything.
I have no knowledge of deploying, testing, or even programming, but this is what I wanted to know regarding working in a medium to large business, as I'm aiming for some kind of programming degree with which to step into the arena of programmers. So this advice about deployments in or out of production is quite helpful! Thanks for your advice and insight!!
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Sand making production line is also called sand and stone production line. And the sand production line is a kind of special equipment for producing construction sand and stone. The sand making machine for sale is often needed in many fields, and this processing line can meet the requirements of simultaneous production of stone and artificial sand.
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Firstly, the feeding system. The system send raw material to sand crusher and sand screening machine. According to crush and screen process, feeding equipment includes vibrating feeder and other types of feeding machines.
Secondly, the crushing system. The system is the heart of the whole set of sand processing equipment. The work of sand crushing plant system is to crush different varieties of ore raw materials into the required size of the finished product. A complete stone production line includes many crushers. These crushing machines have different functions, and complete the crushing operation together.
Thirdly, the screening and transporting system. The system screens the ore which are crushed by crushing machinery. In the compound sand and stone production line, sand and stone need to be separated, and the separated material needs to be transported to the respective site. The sand screening equipment used in this process is generally a linear vibrating screen or other sand sieve machine.
When sand making production line is working, large pieces of stone stored in the silo are transported by the vibrating feeder into the jaw crusher for crushing coarsely. The belt conveyor delivers the coarsely crushed materials into the cone crusher (or impact crusher) for crushing. And then the belt conveyor carries the crushed materials to the vibrating screen for screening. The finished sands(materials above the sieve) are transported by the belt conveyor to the sand washing machine for washing, and then they are sent to the finished product stack with belt conveyor. Large particles stone(materials under the sieve material) are delivered by the belt conveyor to the vertical mobile impact crusher (sand making machine) for crushing finely. Finely crushed stones will be sent by the belt conveyor again into the vibrating screen for screening. In this way, closed loops are formed. This is how do you make sand with a sand processing line.
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Sand washing machine, also known as stone washing machine, is mainly used to remove sand products impurities (such as dust). Because sand washing machine for sale usually adopts water washing method, we call it sand washing machine. Among them, most machines are used to clean machine-made sand, so it is also known as stone washing machine.
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Roxars history of value-adding technology innovation is a cornerstone of our success. The company is instrumental in developing technologies such as 3D gelological modelling, multiphase metering, sand monitoring and real-time geosteering. We collaborate with our customers to jointly develop technology for specific industry products bringing the products of tomorrow to the market today. Innovative Roxar solutions both enlighten and empower customers with reliable, actionable data within the O&G value chain. By providing a continuous information flow, Roxar products consistently guide customers to make more informed decisions about production and integrity. This results in maximized performance throughout the lifecycle of the well, along with increased profitability.
The Roxar 2600 Multiphase Flow Meters (MPFM) accurately characterize flow regimes and provide critical information on a wells production capabilities. Built on a scalable technology platform, the advanced meters signal processing and field electronics provide sensitive measurements and a comprehensive mapping of flow. Employ this modular meter to improve production optimization, flow assurance and well testing, while meeting all field conditions and cost requirements.
>> Accurately characterize flow with advanced signal processing and field electronics >> Improve measurement certainty with identification and measurement of non-symmetrical flow in varying flow regimes >> Significantly reduced costs with a field proven measurement principle >> Compact and light-weight solution >> Easy to install with low power consumption >> Flexibility enabled by a modular design
Roxar Subsea Wetgas meters provide highly accurate water, gas and condensate flow rates, reducing risk and improving flow assurance. The advanced meters deliver unparalleled water sensitivity, accuracy and rapid response for reliable production measurement.These include the industrys first built-in salinity-measurement system, which provides information vital to protecting subsea well and pipeline integrity and supporting metering/allocation strategies in gas and gas condensate fields.
>> Maximize accuracy with multivariate analysis and three-phase measurement based on microwave and gamma densitometer >> Know if formation water is entering the flow with the industrys first dedicated online salinity-measurement system >> Detect changes as little as 0.2 ppm in water content of the flowing well sensitivity never before achieved >> Act immediately to protect subsea system integrity with measurement speeds of 20 times per second >> Simplify installation and integration with a compact design >> Realize maximum performance over the fields lifetime with field-proven reliability and full redundancy >> Ensure valid readings with pressure, volume and temperature (PVT) measurements independent of water fractions
Roxar Downhole Wireless Systems continuously monitor annulus B temperature and pressure for the subsea wells lifetime. Comprised of a wireless reader and a wireless PT Transponder, the advanced system improves production and offshore safety, providing early highpressures warnings, protecting casing integrity and preventing pressure buildup.
>> Real-time temperature and pressure tracking with continuous monitoring and sampling rates as quickly as every second >> Employ a fully integrated downhole solution that connects to the standard Roxar Integrated Downhole Network (IDN) >> Can be combined with other instruments (e.g. HS Gauge, Intelligent Multistage Completion Network) on one Roxar IDN >> Rely on a high-integrity design with no case penetrations >> Simplify configuration with the electronic wireless transmission of power and data, requiring no cables >> Minimize downtime with power from the Roxar IDN no batteries required >> Full bore, no penetrations
The Roxar CorrLog transmitter generates highly accurate in-line corrosion probes readings. Roxar CorrLog offers off-line or wired on-line real time corrosion data. When combined with other Emerson products, it provides highly efficient data management capabilities for an integrated, integrity and process monitoring solution. The result for the operator is efficient corrosion control, pipeline integrity and extended asset life.
>> Best in class resolution and measurement sensitivity >> Combines ER, LPR and galvanic probe functions in one instrument >> Can read probes from most known vendors >> Robust design, proven field performance >> Configuration flexibility, upgrade options >> Through field design and monitoring performance, contributes to improved safety, field integrity and extended equipment life
The Roxar Matrix Downhole Wireless Interface is installed as part of a permanent downhole monitoring system. It allows for communication with wireless instruments provided by Metrol Technology and located at the reservoir sand face. The pressure and flow data leads to efficient well and reservoir management, while the Roxar HS Gauge provides a life of the well permanent monitoring system.
>> Enables wireless communication with Metrol instruments at reservoir sand faces >> Connects to the standard Roxar Integrated Downhole Network (IDN) cable >> Simple communications and fully integrated communications solution >> Interfaces with pressure gauges, valves and temperature arrays from Metrol Technology >> Provides a HS gauge permanent downhole monitoring system for the life of the well
Roxar SandLog & CorrLog Instruments wired or wireless accurately monitor sand and corrosion, extending equipment life and increasing production. Based on intrusive sensors installed into pipes or vessels through an access fittings system, these flexible transmitters combine with the probe functions for superior corrosion and sand-erosion accuracy. Implement as part of a comprehensive asset-management system and realize increased flexibility, reduced costs and improved accuracy.
>> Achieve increased accuracy, decreased risk of signal loss and better data and trending with highly sensitive sensors >> Increase positioning flexibility, optimize signal routing and simplify maintenance and replacement with a 20-meter cable >> Significantly reduce installation costs and effectively monitor previously inaccessible areas with wireless connectivity >> Integrate with Emersons Smart Wireless system, PlantWeb and Roxar Fieldwatch for a complete asset-management system >> Maximize investment and flexibility with the ability to read other manufacturers probes
The Roxar Subsea SenCorr Sand Erosion Sensors measure metal loss caused by the impact of sand particles flowing in the production line. The intrusive sensors accurately determine the short and long-term effects of damage caused by sand in order to maintain asset integrity and provide vital input to flow assurance strategies. Customizable options can incorporate redundant sand erosion, pressure and temperature sensing technologies for additional process insights.
>> Four independent sand erosion elements provide redundancy and cover the full diameter of the pipe section for added reliability. >> Erosion is measured with high accuracy and rapid response to sand production. >> Erosion sensors are independent of changing process temperatures resulting in improved accuracy and reliability. >> Customizable options can incorporate additional pressure and temperature sensing technologies for additional process insights. >> Combine with Roxar Subsea Acoustic Sand Monitors to confirm the occurrence and severity of a sand event, giving operators visibility of sand production. >> Connect to Roxar Fieldwatch monitoring software for in-depth analysis and investigation of process changes.
The Roxar Subsea SenCorr Pressure and Temperature Sensors are based on piezoresistive measurement technology allowing them to maintain accuracy and stability in fluctuating temperature-and high-pressure conditions. Fully-redundant PTPT configurations provide reliable long term production measurements in harsh subsea environments. This sensor measures pressures up to 15000 psi (1034 bar) and is available with industry-standard communication protocols.
>> Operates at pressures up to 15000 psi (1034 bar) while submerged at depths up to 10000 ft (3000 m) >> Available with fully-redundant pressure and temperature measurement capability for enhanced reliability >> Piezo-resistive sensor in an oil-filled cavity provides industry leading accuracy and stability >> Customizable options can incorporate sand erosion and corrosion sensing technologies for additional process insights >> Connect to Roxar Fieldwatch monitoring software for in-depth analysis and investigation of process changes
The Roxar CorrLog Wireless transmitter generates highly accurate corrosion data When combined with other Emerson products, it provides highly efficient data management capabilities for an integrated, integrity and process monitoring solution. The transmitter is part of an integrated WirelessHART solution, where data is forwarded to Roxar Fieldwatch or other software. The transmitters uses a standard WirelessHART communication protocol IEC 62591 that makes on-line upgrades affordable and add value to information generated through sensitive and fast responding monitoring sensors.
>> Best in class resolution and measurement sensitivity >> Combines ER and LPR functions in one instrument >> Can read probes from most common vendors >> Up to 20 meters probe cable allows for flexibility in convenient positioning for maintenance and radio signals >> Flexibility in data formats and data management
The Roxar Retractor Tool allows for safe and convenient retrieval and installation of the Roxar range of Retractable Probes and Coupon Holders in low pressure application pipe lines. The tool is easily attached to the retractable probe or coupon assembly and removed again after use. The result is easy and convenient retrival of corrosion probes and coupons while maintaining safety at your plant.
>> Ensures safe installation and replacement of retractable probes and coupons in low pressure environments >> The retractor tool is very light weight >> The retractor tool kit comes in a convenient transportation case >> Easy installation and easy to use >> The retractor tool is manufactured of corrosion resistant materials
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