Precautions for Using a Rotary Evaporator

Rotovap is an important equipment, used mainly in chemical laboratories to gently remove solvents from given samples from the process of evaporation. Henan Lanphan Industry Co., Ltd is a professional manufacturer of this equipment and intends to provide laboratories with all information and assistance in using it in the most efficient manner. This is the reason why they are explaining about using the equipment in a proficient manner for chemical labs to achieve the best results without fail. 

The science equipment manufacturer publishes an article on using the rotary evaporator to efficiently distill solvents. According to the spokesperson of the company, the information will allow laboratories to use the apparatus with efficiency to achieve great results. The article will also detail out the correct way to halt the apparatus. The spokesperson reveals that one should, at first, must learn about the equipment itself. It consists of four parts, which are water or oil bath, rotary rotor, a glass condenser and flasks. The article reveals precautions for using a rotary evaporator, which are easy to learn and practice in laboratories. 

rubber expansion joint article

　　The rubber flexible joint, also called as the rubber joint, is a weather resistant joint with a high elasticity, high air tightness and medium resistant. It is generally used in the civil construction water supply and drainage project, fire pipe network pump room unit pipeline acceptance, sewage treatment pipeline connection, high pressure gas and liquid chemical medium transportation, petroleum, and shipbuilding, etc. Due to the wide use of the rubber flexible joint, the author would like to introduce the three ways to choose the best quality rubber flexible joint.

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rubber expansion joint

How to clean steel expansion joints

Metal expansion joints are the commonly seen pipe fitting, mainly used to compensate pipeline displacement caused by thermal expansion, widely used in all walks of life. The service life of metal expansion joints is effected by various factors, regular inspection and maintenance helps to lower the damage. Besides, during the manufacturing, storage and installation process of steel expansion joints, it will generate rust, welding slag, oil anti-rust agent, dust and sand on the surface, these impurity will greatly affect the normal use of steel expansion joints, thus, proper cleaning and maintaining also benefits to lengthen the service life of a steel expansion joints. We introduces you the cleaning methods for steel expansion joints.

Metal Expansion Joints

1.Chemical cleaning. Use chemical agent to clean the steel expansion joints. Apply temporary pipeline and cycle pump station to chemical clean the steel expansion joints from two sides. Chemical cleaning has the advantages of good flexibility, no requirement for steel expansion joints shape, fast speed, etc..

2.PIG cleaning. It relies on pump to drive fluid to actuate PIG move forward within the pipe, and eliminate the dirt inside the pipeline. PIG cleaning method is widely used in all kinds of process pipe, oil field transportation pipeline cleaning, especially long-distance pipeline cleaning.

3.High pressure water cleaning. Use high pressure water jet above 50Mpa to clean the pipe. It suits for short-distance pipeline, and pipe diameter should more than 500mm. It has advantages of fast speed and low cost.

Henan Lanphan is the leading manufacturer in metal expansion joints industry, we have almost 30-year’s production and selling experience on expansion joints, except for metal expansion joints, our products includes rubber expansion joints, metal flexible hose, metal bellows, fabric expansion joints, rubber check valves, rubber products, etc.. All of those sells good all around the world. If you have any question regards to the pipe expansion joints, please contact us immediately.

Problem Summary of Flexible Metal Hose in Different Industries

With the continuously development of our foreign trade business, the inquiry and order of flexible metal hose are increasing. According to the forecasting by foreign trade salesmen from Lanphan, the application market of flexible metal hose is getting larger and larger. Except for the transportation of all kinds of fluid which is familiar to people, such as water, oils and medicine, the application quotient in machinery industry is increasing. Combine the customer feedback and experiences from Lanphan technicians, we sum up the easily occurred problem of flexible metal hose in different industries.

Flexible Metal Hose

Damage of Steel Wire Net Cover

1. Pitting corrosion and stress corrosion damage the steel wire net cover and make the flexible metal hose lose efficacy. A company’s flexible metal hose on coastal heat supply pipeline system has burst during the production operation. It caused 10t’s oil leakage to inland river and seriously polluted the environment.

2. CI etching damage the steel wire net cover and cause efficacy losing. For example, a burst has been occurred in flexible metal hose which connect to air compressor near the piping side on a boat, and it result in a totally breaking between the flexible metal hose’s steel wire net cover and joint.

Flexible Metal Hose’s Material does not meet the requirement

Because the selected material for flexible metal hose does not meet the requirements of operating environment, it aggravates corrosion of the pipeline and leads to piping breaking. For instance, the leakage of flexible metal bellows hose on assistant nozzles in continuous catalytic reforming unit’s heating furnace in an oil refinery’s aromatic hydrocarbon workshop is caused by this factor.

Low Strength of Flexible Metal Hose

The low strength on hose’s fixed support and outer steel mesh can cause the flexible metal hose which near the water pump exit have the problem of outer net damage, liner local distortion and dislocation in soft section during the operation.

Improper Pipeline Support Setting

Improper pipeline support setting makes the whole pipeline system lateral displacement, and it cause efficacy losing of flexible metal hose been stretched. For instance, the flexible metal hose we installed before oil tank in and out the oil pipeline valve often lose efficacy for distortion because of this problem.

Why Your Flexible Hoses Can Fail?

Flexible hoses are essential in the smooth operation of many industrial applications, transporting liquid or gas efficiently to create a quality final product. Be it food processing, chemical, power generation or marine and offshore, your industrial hose set up is integral to your productivity. Unfortunately, even industrial hoses don’t last forever and when a failure occurs, it has the potential to cost a lot time and money in down time. In fact, there are a number of reasons why your flexible hoses might fail, making it ever more important to have them checked regularly.

flexible hoses

Abrasion

The constant use and rough treatment of flexible hoses can lead to the pulling, crushing and scratching that can reduce its strength over time and cause failure. It is hugely advisable to look for indications of past abrasion that could have significantly weakened the hose. Any signs of damage should result in the immediate replacement of the industrial hose.

Extreme Temperatures

High operating temperatures and severe pressure fluctuations will over time cause problems to your industrial hoses. To help prevent this, you must where possible protect the hydraulic hose from exposure to temperatures that are not within its operating range. Sometimes specialist equipment is required, such as heat shields – as well as the ongoing checking up on hose quality and functionality.

Significant Fluctuation in Pressure

Extremes in temperatures and pressure fluctuations can cause huge problems to industrial hoses, thus ensuring that your operations are running at pressures that they are designed for is incredibly important.

Bending

The bending of industrial hoses will have different effects on different model types. Some flexible hoses are designed to withstand a certain level of bend and twist, while others are most certainly not. Acknowledging if your application will put any of these types of pressure on the industrial hose is important. Avoid bending the flexible hose wherever possible to ensure a longer lifespan.

Age

Over time, rubber hardens, causing your flexible hose to split and be more prone to damage. The more you use your industrial hoses, the sooner this process is likely to start happening particularly with fluctuations in pressure and temperature.

Incorrect Storage

The failure to appropriately store your industrial hoses is a large reason for premature failure when it comes to industrial hoses. Proper storage of flexible hoses will also ensure that you are more efficient in the storage of the working environment. Industrial hoses are incredibly important members of your operations, so treating them with large consideration and acknowledgment is essential, leading to a happy hoses and a happy organization.

Flexible rubber expansion bellows common problems and solutions

Flexible rubber expansion 

1. Is the flange galvanized?

Yes, carbon steel flange not painting anticorrosive paint must be galvanized in order to avoid rusting. Usually, we choose electronic galvanized and hot dip galvanized, and most of our customers will choose hot galvanizing.

2. What kind of standard of your drilled flange?

Besides Chinese national standard, we also support American standard, German standard, British standard, Japanese standard, European standard and Australia standard. If you can give us the center distance of the hole, the number and diameter, we can also produce customized flange.

3. Does your company have spool type flex rubber expansion bellows?

Yes, considering that the pipe length will be longer or shorter than the expectation after finishing the installation of the pipes and the cost of producing new mold is expensive, we can produce spool type flex rubber expansion bellows according to your requirements.

4. Can the inner layer rubber and outside layer rubber be made from different rubber material?

Yes, we can produce the flex rubber expansion bellows according to the environment, and we will choose different rubber for the inner layer and outside layer.

5. Can I only buy ball without the flange?

Yes, and the price will be cheaper. For small diameter flex rubber expansion bellows, we have goods in stock and we can offer you a free hydrotest, but for large diameter flex rubber expansion bellows you need to order.

6. How long is your product’s warranty?

12 month. From the day the customer receiving the goods, we grant a free replacement if the products have any problems during the guarantee period.

7. Can you offer the flex rubber expansion bellows sample?

For standard type we can offer the sample, but the customer will afford the freight. For non-standard or more quantity, we will charge for the sample.

8. Does the flex rubber expansion bellows have inspection report?

Yes, all of our product will be conducted hydrotest and leave the factory with a qualified inspection report.

9. Can you offer the drawing?

Yes, we have a excellent engineer team, and they will offer your professional drawing and technical support.

How to Properly Install and Maintain Metal Expansion Joints?

This article is a brief installation and maintenance guide for metal expansion joints. To better install and maintain the pipe expansion joints, users must obey to certain rules. Please check following tips about something you should and shouldn’t do regarding to pipe expansion joints.

Something you are not supposed to do on pipe expansion joint:

Do not remove any moisture-absorbing desiccant bags or protective coatings until ready for installation.

Do not use hanger lugs as lifting lugs without approval of metal expansion joints manufacturer.

Do not allow weld splatter to hit unprotected metal expansion joints. Protect with wet chloride-free insulation.

Do not drop or strike carton.

Do not exceed a pressure test 1-½ times the rated working pressure of the metal expansion joint.

Do not remove shipping bars until finish installation.

Do not use cleaning agents that contain chlorides.

Do not force-rotate one end of an pipe expansion joint for alignment of boltholes. Ordinary bellows are not capable of absorbing torque.

Do not use chains or any lifting device directly on the bellows or bellows cover.

Do not use shipping bars to retain thrust if tested prior to installation.

Do not hydrostatic pressure test or evacuate the system before installation of all guides and anchors. Pipe hangers are not adequate guides.

Do not use steel wool or wire brushes on pipe expansion joints.

Bellows Pipe Expansion Joints

Something you are supposed to do on pipe expansion joint:

Install single Van stone liners, pointing in the direction of flow. Be sure to install a gasket between the mating flange and liner.

Store the metal expansion joints in a clean dry area where it will not be exposed to heavy traffic or damaging environment.

Use only designated lifting lugs.

It is good practice to leave one flange loose until the pipe expansion joint has been fitted into position. Make necessary adjustment of loose flange before welding.

Remove any foreign material that may have become lodged between the convolutions.

Install the metal expansion joint with arrow pointing in the direction of flow.

With telescoping Van stone liners, install the smallest I.D. liner pointing in the direction of flow.

Make the piping systems fit the pipe expansion joint. By stretching, compressing, or offsetting the metal expansion joint to fit the piping, the joint may be over stressed when the system is in service.

Remove all shipping devices after the installation is complete and before any pressure test of the fully installed system.

Inspect for damage during shipment, i.e., dents, broken hardware, water marks on carton, etc.