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Common Malfunctions and Maintenance of Double Glass Reactors

April 20, 2018 by lanphan  

With the development of the economic, the common chemical reactor---double-layer glass reactor, relaying on  its constant speed, no brush, no spark, safety and other advantages, has been widely applied to laboratory test, pilot and production in the related fields. 

Although this industrial reactors have a wide range of applications, many users do not really understand its common malfunctions. When there is a failure, they will ask a dedicated technical staff to renovation. Do you want to solve the problems that occur during use? Do you want to be a professional technician? Then look at this article.


Common malfunctions of this vacuum distillation reactor are as follows:

1. Vacuum hose aging: Please replace the vacuum hose or vacuum pump hose . When using the Lanphan apparatus glass reactor, turn on the power switch. If the indicator does not shine: external power fails or bad contact, please let professional electrician check the power supply and outlet.

2. Power indicator lights but not rotating: Rotary shaft rust, stop using, contact with the supplier. Motor, electrical box failure, not connected seven core plug, reconnect seven core plug;

3. There is a vacuum, but can not pump: seal wear and tear. If the connect vacuum switch leaks, please replace the sea and switch. Vacuum not continuous or steady: please clear the dirt and check vacuum gauge and vacuum pump;

4. The vacuum suddenly disappeared: glass cracks, broken glass parts switch, exchange switch;


5. Fuse short circuit: the power switch is placed in the OFF position, and then set the fuse.

The Important Function of Condenser of Rotary Evaporators

April 20, 2018 by lanphan  

The rotary evaporators exported from Henan Lanphan mainly consists of motor, distillation flask, heating kettle, condenser pipes and other components. Every part of the instrument is the significant part. This text will have a deep discussion on the condenser of rotary evaporators in order that the customers can have a good knowledge of the product and make a right decision when buying the products.

Structure of Rotary Evaporator

Structure of Rotary Evaporator

Henan Lanphan's condenser equipment have two types: vertical condenser pipes and horizontal condenser pipes, which make use of double coil condensation or some other condensing agent like, dry ice.

Rotary evaporators evaporate through the thermostatic control of liquid and the gas backflows in the condenser which will become liquid after thermostatic cooling, and then it will backflow into the recycled bottle. During the whole operating process, condenser plays an important role and there are many attention places when installation. When the gas backflows into the condenser, any leak of the condenser will directly influence the gas reaction; Although the temperature is controlled through thermostatic control, the intensity of condenser itself will also influence the temperature; condenser equipment is the key point of gas changing into liquid, so that any problem will influence the liquid purity.

We will help you choose the ideal condenser, and for more information go to our official websit




How to Properly Install and Maintain Metal Expansion Joints?

April 20, 2018 by lanphan  

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

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.

How to Ensure Safety Use for Chemistry Glass Reactor?

April 18, 2018 by lanphan  

To safety use the chemistry glass reactor, it’s necessary to know the chemical reactor safety precautions before starting the operation. Please read following instructions carefully.

chemical reactor safety


chemical reactor safety

The first thing to ensure chemical reactor safety is to check the connecting tube, flange and valves, once find leakage please change them immediately. Also check the fasten fittings and tighten them up. In a word, check every piece of component for the first time, ensure all components are in good condition.

The second important thing to ensure chemical reactor safety is properly maintenance of chemistry glass reactor. The chemistry glass reactor is made from high borosilicate glass, which is noncorrosive and high strength. To better fit the connecting piece, each valve and connecting mouth should be smeared with vacuum lubricating grease evenly, and if we use the grind mouth for a long time, the lubricating grease will become harden or oxidized, which cause difficulty in rotating. So it’s better to dismount the chemistry glass reactor’s glass mouth and wrap it clean by clean paper, then use methylbenzene and xylene solvents to carefully wrap it clean. But if grind mouth is fastened or adhered, it’s better not to force to dismount, alternative, heating method is an optional to soften the harden lubricating grease.

The glassware of chemistry glass reactor belongs to easily damaged parts, so during installation and use, please carefully check it. Henan Lanphan will change free new glass component to customers if damaged by transportation cause; but if it damaged in service, we are not responsible for it. But we’ll offer discount price for buying new glassware.

Grasping proper cleaning method for chemistry glass reactor’s glassware is also important, we have talked about this topic in previous post, please refer to it.

Above is the chemical reactor safety use notes, an English version User Manual will be sent to you along with the chemistry glass reactor. The Manual will instruct you to install and use the instrument. If you still can’t find the answer, please contact Lanphan at sale@lanphan.com for free technical support.

Which One Should I Choose? Rubber Hose or Metal Flexible Hose?

April 18, 2018 by lanphan  

Rubber hose and metal flexible hose are two types of fluid line that installed in pipelines to delivery medium. The purpose of this article is to help you determine which one is best for your application, rubber hose or metal flexible hose? Let’s see their strengths and weakness.

stainless steel hose



                                     stainless steel hose

stainless steel hose or metal flexible hose is manufactured by welding the steam and butt of stainless steel hose ends together, and welding the fittings onto stainless steel hose. A stainless steel hose has excellent heat resistance and high pressure rating, it shows great adaptability when applying to high pressure and heat pipelines. Welding is the key procedure in the manufacturing of a stainless steel hose, if welding in a wrong way, a leak path can be created and bad for pipeline operation.

A rubber hose is manufactured by rubber material combining with cord fabric line inside the rubber layer. Rubber hose is easier to set in complex working condition since it has good flexibility. Rubber hose is convenient for replacement and its pressure range ratings up tp 10000 psi. Rubber material has good vibration resistance, thus rubber hose is best for pipelines that require resistance to vibration. However, rubber hose is not suitable for high pressure and strong external force pipelines. Comparing to metal flexible hose, rubber hose has shorter service life, it needs to be replaced in regular time.


In modern fuel gas piping system, more rubber hose is replaced by stainless steel hose. Because stainless steel hose is more safe and durable in use. Please enquiry at best@lanphan.com or call 86-371-67447999.

The Operation Process of Double Layer Glass Reactor

April 18, 2018 by lanphan  

With the development of the economic, the double-layer glass reactor, relaying on  its constant speed, no brush, no spark, safety and other advantages, has been widely applied to laboratory test, pilot and production as glass lab equipment , biochemistry lab equipment, or glass chemistry equipment in the related fields. Although the double layer glass reactors have a wide range of applications, many users do not really understand its operation process. In this article, we’re going to learn the some matters needing attention.

double layer glass reactors

1. Before operation or maintenance, the lab personnel should take the watch, ring and other hard objects off, so as to avoid damage to the glass. Especially the diamond ring may cause fatal damage to the glass reactor vessel and glass accessories.


2. Strictly abide by the instructions in the product instructions on cooling, oiling and so on. Make regular maintenance on glass reactor vessel.


3. The electric control instrument should be operated by specially-assigned person, and the overload protection facilities should be set up according to the regulations.


4. When all valves are used, the stem should be slowly rotated and pressed tightly to achieve the sealing effect. It is not easy to slam the cover so as not to damage the sealing surface.


5. It should be operated strictly according to the working pressure and working temperature calibrated on the nameplate of the product, so as not to cause danger.



What’s the Multiple Uses of Vacuum Pump?

April 16, 2018 by lanphan  

Vacuum pump is the basic air abstraction equipment, it has a wide application in all works of life. Today Lanphan will list you some uses of vacuum pump , hope you can get a better understanding of vacuum pump uses through this post.

uses of vacuum pump


uses of vacuum pump

Pharmacy and Chemical Engineering

The vacuum pump uses includes pharmacy, pesticide, cosmetics, soap and synthetic detergent, surface active agent, printing ink and its auxiliaries, binding agent, photographic materials, water treatment agent and polymeric flocculant, papermaking additive, leather auxiliaries, flotation agent, metal surface treatment chemicals, biochemical engineering, etc..

Applicable products: vacuum unit, water ring vacuum pump, slide valve vacuum pump, reciprocating pump.

Vacuum Coating, Vacuum Drying, Surface Treatment

The vacuum pump uses in vacuum treatment industry, it plays an important role in the area of vacuum coating, vacuum drying and surface treatment.

Applicable products: vacuum units, roots vacuum pump, slide valve vacuum pump, rotary vane vacuum pump.

Vacuum Melting, Brick and Ceramic Manufacturing

The uses of vacuum pump also reflect in metallurgy, brick and ceramic industry, it is used to prevent oxidation by high temperature during the workpiece process. The vacuum pump uses vacuum to discharge water and air from brick and ceramic.

Applicable products: slide valve vacuum pump, rotary vane vacuum pump, vacuum units, water ring vacuum pump.

Food Packing, Milking, Beverage Industry

Vacuum packing technology originates from the 1940s, in 1950, polyester and vinyon plastic successfully applies in vacuum packing. Vacuum packing is an important application of vacuum pump uses, it is designed to keep food in fresh condition.

Applicable products: water ring vacuum pump, rotary vane vacuum pump, oilless vacuum pump, vacuum units.


We just listed some of the uses of vacuum pump, actually there are so many other uses. If you can’t find your application, please contact us for assistance. We can help you find desired vacuum pumps. Tel: 0371-67447999; email: sale@lanphan.com

What is the Principle of Rotary Evaporator?

April 16, 2018 by lanphan  

Rotary evaporation is a technique most commonly used in organic chemistry to remove a solvent from a higher-boiling point compound of interest. A rotary evaporator is a distillation device that has been been around now for some years in the kitchens of renowned restaurants and prestigious bars.

Rotary Evaporator

The rotary evaporator, or "rotovap", however the correct diction is rotavapor, was invented in 1950 by the chemist Lyman C. Craig. It should be noted that this term is a registered trademark by Buchi. One of the famous brands of rotary evaporator is Buchi rotovap.


Next let’s have a look at the rotary vacuum evaporator principle. Take the Buchi rotovap as an example: Roto-evaporation requires mechanical rotation of a Buchi flask under vacuum. The rotation of the Buchi flask increases the surface area of the solvent to be removed, increasing the rate of evaporation, and reducing the risk of "bumping": when a large pocket of solvent vapor forms rapidly and displaces the surrounding liquid. The vacuum reduces the boiling point of the solvent, as well as providing a means to separate the solvent from the compound of interest.


The primary use of a Buchi rotovap is to dry and purify samples for downstream applications. Its speed and ability to handle large volumes of solvent make rotary evaporation a preferred method of solvent removal in many laboratories, especially in instances involving low boiling point solvents.



However, as we all know, rotary evaporator costs expensive, so Buchi rotavapor price is high. If your budget is limited, you can search for used Buchi rotary evaporator or low cost of rotary evaporator. 

Where to Find A Reliable Spool Rubber Expansion Joint Supplier?

April 16, 2018 by lanphan  

Spool type rubber expansion joint is designed for the non-standard products, it has the same function with molded type rubber expansion joint, they are all used for compensating system pressure spikes and accommodating axial, lateral and angular movements.

spool rubber expansion joint


spool rubber expansion joint

Spool type is more expensive than molded type, so do you know why rubber expansion joint suppliers still fabricate spool rubber expansion joint for sale? As a rubber expansion joint supplier, we receive inquires from all over the world, and molded type standard rubber expansion joints are not applicable for all working condition, most working environment require non-standard products to fit for using. In this circumstance, rebuild a mould or revise a mould is too expensive, rubber expansion joint suppliers always recommend customers to order a spool one.

What circumstances should you choose spool rubber expansion joint?

First, length different from standard type, whether too short or too long;

Second, small diameter products require rubber expansion joint suppliers to fabricate full face flange, floating flange rubber joint is difficult to be fabricated to spool type;

Third, drill hole is differ from standard, especially oversize center distance, mould can not meet requirements.

What’s the difference between spool and molded type rubber expansion joint?

For molded type rubber expansion joint suppliers, the mould is made according to different country standard, although preliminary mold production cost is high, but the standard rubber expansion joint order amount is very big, in total the price is preferential a lot with the long time. And mold vulcanization of rubber joint can product non-standard length according to the height of the extended mold.

Spool rubber expansion joint supplier manufacture spool type by hand built process, adjusting the rubber joint spacing rod can well adjust rubber joint length, suitable for different environments, and rubber joint products need not manufactured mould so length can be adjusted, but the price cost is higher.


In summary, model selection should on basis of actual working conditions. We Henan Lanphan is a qualified rubber expansion joint supplier in China, our products exported to worldwide countries and areas, if you are looking for rubber expansion joint supplier, do not hesitate to contact us at best@lanphan.com

How to Extend the Service Life of Double Glass Reactor?

April 12, 2018 by lanphan  

The double glass reactor is a common apparatus in chemistry . In addition to the inverter, glass and motor related, the service life of double layer glass reactor is closely related to routine maintenance. In order to prolong the service life of double glass reactor and protect your benefit, please read this part carefully. The inter-layer of the double layer glass reactor can provide both high temperature reaction (the maximum can reach 300℃)and low temperature reaction( the minimum temperature can reach -80℃). These daily work has great damage on the lab reactor, so the routine maintenance is quite important.

The followings are the methods of double-layer glass lab reactor routine maintenance:


1. Check the interface of the instrument. Handle the equipment gently.


2. The interface of the instrument can not be screwed too tightly. It should be regularly loosened to avoid long-term lock caused by the connector biting.


3. Wipe the interface with soft cloth (instead of paper napkin), then apply a little vacuum grease. ( Cover vacuum grease well after use to prevent dust entering. )


4. Clean the seal regularly. The method is: remove the sealing ring and check whether there is dirt on the shaft, then wipe clean with a soft cloth and coated with a little vacuum grease to keep the shaft and seal lubricant.


5. The Teflon switch can not be tightened to avoid the damage of the glass.


6. Loosen each Teflon switch after stop, long-term static in the working state will make the PTFE piston deformation.

7. Start the power switch first, then let the machine turn from slow to fast, stop the machine when it is stopped, then turn off the switch.


8. After use, wipe the surface to clean grease, stains, residual solvent with soft cloth.


9. The electric part can not get water, and it is strictly prohibited to be affected by damp.



10. It is necessary to purchase authentic fittings, and using other accessories at will may cause fatal damage to the machine.