Connection Modes
- Categories:Revelant Skills
- Time of issue:2020-06-04 00:00:00
- Views:0
Connection Mode Performance |
Single Press Fittings |
Double Press Fittings |
Ring compression connection |
Socket weld connection |
Obtainment of technology |
M corporation from Germany |
Viega corporation from Germany |
From the principle of press fitting technology |
Welding Engineering |
Production Standard |
GB/T19228-2001 |
GB/T19228-2001 |
GB/T33926-2017 |
QB |
Technical Application |
It has been used abroad for over 60years and for about 20years in China |
It has been used abroad for over 50years and for about 20years in China |
There is no such product abroad , and it has been used for about 7years in China |
It has been used for about 10years in China |
Connection Structure |
Press pipes and pipe fittings with special tools and the section at pressed interface is hexagonal(below DN50) or round (above DN50).The rigidity of stainless steel plays a connecting role , and the wall thickness of the pipe fittings determines the strength of rigidity.Therefore , the minimum wall thickness required in the GB material shall not be lower than that in GB |
Press R cavity in pipe fittings with special tools.The press section is hexagonal(below DN50)or round(above DN50).The rigidity of stainless steel plays a connecting role. |
Press pipes and pipe fittings with special tools ,the section at pressed interface is approximately bulging circle, take advantage of stainless steel rigidity to connect.The thickness of the pipe wall determines the strength of rigidity |
Welding the outer edge of the pipe with Argon arc welding gun Connecting pipe with the melted stainless steel liquid. |
Connection Structure Features |
The R cavity of the pipe fitting is finished in the factory and eliminate the hard force concentration by annealing.The interface section is hexagonal . It won’t rotate for installing pipeline accessories.(above DN50 , adopt threaded connection) |
The general features are same as single press fitting。There is a socket section outside R cavity which can effectively improve tensile resistance ability , perfectly protect the damage of the shape of R cavity by external force and therefore improving the compression ratio of sealing ring.Effectively protect sealing ring from dust and ultraviolet ray. |
There is no R cavity in the pipe fitting .Press it to form R cavity with a special tool during installation.The deformation of the pipe fitting is large and the stress is concentrated.Since can not remove stress by annealing in construction site,the R cavity has a stress release process which will cause the pipe to loosen and leak in 2 to 5 months and easily cause stress corrosion, especially in the case of high temperature.The section at the connection is approximately circular which may cause leakage by the rotation of the pipe fitting due to the installation of the pipe fittings |
The pipe is thin and easy to be welded through(Burn through). Once welded ,it is hard to be repaired. During welding , the high temperature will cause damage to the internal metallography of stainless steel , resulting in low corrosion resistance of the weld, which makes it impossible to complete the annealing and pickling passivation process after welding , make the weld in the weakest state. |
Sealing Structure |
Type sealing ring ,linear longitudinal seal, all points of compression ratio is pretty uniform. O-type sealing ring has the best elasticity |
O -type sealing ring ,linear longitudinal seal, all points of compression ratio is pretty uniform. O-type sealing ring has the best elasticity |
Annular pressed broadband cavity seal , rectangular section belongs to the surface seal , because can not guarantee 100% ring compressed.The compression ratio at each point of the sealing circumstance is not uniform , easy to leak.Rectangular section structure , is more suitable for flange connection. |
No sealing ring |
Sealing Material |
Chlorinated butyl has high permanent compression ratio , accords with GBs. The sealing ring is black , more resistant to ultraviolet radiation aging |
EPDM rubber accords with GBs and has excellent permanent compression ability, it has aging resistance . It is a material which is widely used in hygienic requirement and high sealing requirements of various water accessories .The service life of civil water supply pipeline is higher than that of pipeline verified by Shanghai Polymer Research Institution.The sealing ring is black m more resistant to ultraviolet radiation aging. |
Adopt silicone , relatively soft , and the permanent compression ratio ability is not enough, easy to absorb water.There is no relevant GB for this material.Silicone rubber in water supply sealing materials generally in the hose connection in the steel wire seal , belongs to the short life of the sealing materials to be maintained.Generally , the service life in water supply material is 5years.At present silicone rubber is commonly used in short life of the sealing occasions, such as pacifier.Therefore , the compression GB did not include silicone rubber in the GB |
No sealing ring |
Pipe Fitting Technique |
Complicated production process and the technical content is high.The threaded part is precision cast by silica sol .Pipe fittings adopt Cold stamping And they are processed by annealing , pickling and passivation .The sealing ring has been assembled in the R cavity of the pipe fittings. |
Same as single press fittings
|
The production process is simple . Pipe fitting and threaded fittings are produced bu extrusion .There is no R cavity for sealing ring in pipe fitting . Pipe fittings and sealing rings are separately sale. The sealing ring that should be assembled during installation in the factory which belongs to semi-finished products of press fittings |
Cool Punch Process |
Other Accessories(Thread connecting part ) |
Silica sol precision casting can ensure the physical performance of casting without stress concentration . The dimensions and specification of the Male Hexagon accessories conform to the GB. Standard wrench can be used for construction which is convenient. |
Silica sol precision casting can ensure the physical performance of casting without stress concentration . The dimensions and specification of the Male Hexagon accessories conform to the GB. Standard wrench can be used for construction which is convenient |
Seamless stainless steel pipe is produced by Cold extrusion (Cold Hobbing) which is easy to form stress concentration .The outer hexagon dimension specification of threaded fittings are out of standard that can not match standard wrench ,and only pipe wrench can be used ,which is very inconvenient. |
Seamless stainless steel pipe is produced by Cold extrusion (Cold Hobbing) which is easy to form stress concentration .The outer hexagon dimension specification of threaded fittings are out of standard that can not match standard wrench ,and only pipe wrench can be used ,which is very inconvenient. |
Working Pressure |
Working pressure 1.6MPA that accords with GB |
Working pressure 1.6MPA that accords with GB |
Working pressure 1.6MPA that accords with GB |
Working pressure 1.6MPA that accords with GB |
Specification of Pipe |
Accord with GB/T19228,take DN25 for instance , the actual inner diameter is 26.58mm |
Same as single press fitting |
Accord with GB/T33926,take DN25 for instance , the actual inner diameter is 23.8mm |
Take DN25 for instance , the actual inner diameter is 23.8mm,low water flow. |
Wall Thickness of Pipe |
Accord with GB |
Accord with GB |
Wall thickness is lower than GB,generally is 70-80% wall thinner than GB |
Same as ring pressure type |
Material Cost |
Because of pipe’s wall thickness , pipe and pipe fittings’ cost are reasonable |
pipe and pipe fittings’ cost are reasonable |
Due to the outer diameter and wall thick are lower than GB, each product weight is 70-80% lighter than press fitting, thus the total price is pretty low. Pipe fittings’ price isn’t contain sealing ring . The cost of pipe fitting is close to press fitting |
Due to the outer diameter and wall thick are lower than GB, each product weight is 70-80% lighter than press fitting, thus the total price is pretty low. |
Construction Cost |
One time press form?,short time of installation and the procedure is simple.Just insert the pipe into pipe fitting for pipe fitting has already assembled with sealing ring , saving installation time |
Same as single press fitting |
Long time of installation , need secondary or third time press to make long working hours.Complicated procedure , installing the sealing ring into pipe then press it . If the sealing ring isn’t in place , unplug pipe and reinstall in .That results in nearly 15% more time for installation than press fittings |
Argon are workers are paid more than ordinary workers. Need welding wire , argon and other auxiliary materials dynamic electricity.These auxiliary materials make up about 9% of materials. Long time installation is around1.6 times as long as press fitting installation.The preparation time of argon gas protection is basically the same as that of press fittings |
Service Life |
Stainless Steel has service life for 70years,due to the wall thickness conforms to GB , the corrosion resistance is strong.The sealing ring is chlorinated butyl rubber up to 50years |
Same as single press fitting. Sealing ring adopt EDPM rubber, the service life is longer than that of pipeline |
The service life of stainless steel is 70years.However the wall thickness is thinner that press fitting and there is no corrosion allowance thus it exists a risk of corrosion by other environmental factors.Sealing ring ,silicone rubber’s performance decline after 5years |
The service life of stainless steel is 70years.However the wall thickness is thinner that press fitting and there is no corrosion allowance thus it exists a risk of corrosion by other environmental factors. Welding process is not proper will cause problem in quality. |
Fire Protection Requirement |
No open flame , no fire hazard |
No open flame , no fire hazard |
No open flame , no fire hazard |
There is open flame during installation , fire hazard |
Transmission Energy Consumption |
Save energy |
Free maintenance |
Maintain after2 years because of leakage Change sealing ring after 10years |
Welding process is not proper will cause short time maintenance |
2.From product security , double press fitting is better than single press fitting ,single press fitting is better than Ring compression connection or Socket weld connection
3.From installation cost , double press fitting and single press fitting is pretty lower, Ring compression connection And welded pipe fitting is high
4.From the analysis of fire requirement , the risk of Socket weld connection is top especially when the interior decoration construction at the same time , it’s easy to cause fire.
5.From the sealing performance , Ring compression connection is the worst.
6.From the daily maintenance and energy consumption, Ring compression connection is the worst.
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