How to choose an expansion joint manufacturer?
Choose the expansion joint manufacturer, don't come up and ask "how much is the quote". Nine of ten purchases are planted in this first step-the product is not understood, and there is no use in price comparison. You have to first figure out whether the pipe is traveling through high-temperature flue gas or corrosive liquid, and whether the displacement is axial or transverse. For example, in the power station industry, you have to useCorrugated expansion joint for power station industryOrHigh temperature axial expansion joint； Corresponding to cement production lineMetal Corrugated Expansion Joints in Cement Industry； What about the desulfurization system? HonestlyDesulfurization flue gas baffle doorAndNon-metallic expansion joint (fabric fiber expansion joint)。 If you don't choose the right product, no matter how cheap the manufacturer is, it is useless-the rework fee is enough for you to buy three sets of genuine products.
How to divide non-metallic from metallic? Don't just try to be cheap
Many people think that non-metallic expansion joints are made of fabric fibers, and the picture is cheap. But you have to know,Non-metallic expansion joint (fabric fiber expansion joint)High temperature resistance, large compensation, suitable for flue gas pipeline;Metal hoseAndCorrugated expansion joint for power station industryHigh strength, good pressure resistance, suitable for steam pipeline. The rectangular one is more complex —Rectangular non-metallic expansion jointAndMetal rectangular expansion jointThe application scenarios are completely different, so don't mix them. We also have it in our cataloguerubber compensator、Rubber PTFE compensator、PTFE compensatorEach material corresponds to different media: rubber is afraid of oil, and PTFE is corrosion-resistant. This common sense must be available. Wrong choice, three months of air leakage, who do you want to cry?
How is the technical strength of the manufacturer?
Asking three questions can sieve out 80% of the "leather bag companies". First,Do you have any experience in designing deflectors?Specific Function of Expansion Joint Guide TubeIt is to protect the bellows, and the life of the guide tube is directly cut in half in high-speed fluid applications. Second,How to adjust the tie rod nut? Should the screw be removed before installation?These inHow to adjust the tie rod nut of expansion jointAndDo you need to remove the screw of the expansion jointThere are standard answers in, and the manufacturers who can answer them are at least not laymen. Third,Will the selection calculation of pressure balance expansion joint be done?Such asStraight pipe pressure balanced expansion joint、Curved tube pressure balance expansion joint、Compound straight pipe bypass pressure balanced expansion jointThis thing involves blind plate force, and the pipe support will collapse directly if you miscalculate it. You dare to let someone who doesn't even understand the formula design it for you?
Pits in installation and commissioning, ten purchases nine plants
You think you can buy it and tighten it?Correct installation method of expansion joint of large tie rodThat's not how it works. Does the direction of the arrow on the expansion joint refer to the direction of media flow, or the direction of displacement?The direction of the arrow of the expansion joint refers to-Remember, the arrow indicates the direction of the medium flow. AndFunction of expansion joint tie rodIt is to restrain the bellows from producing additional displacement, and the positioning screw must be loosened after installation. Many people forget to dismantle it, and as a result, the expansion joint becomes a rigid connection and the weld joint is cracked. Another classic question:Electric plug-in insulation doorAndManual plug-in insulation doorHow to choose?Double-sealed single-axis circular baffle doorUsed in what working conditions? These details determine whether the equipment will last. And guess what? I have seen a customer use the electric as manual, and finally the motor burned and blamed the manufacturer.
"Niche" products can best see the level of manufacturers
Two days ago, I met a customer who made a thermal pipe network, and insisted on burying the universal corrugated expansion joint directly. I said buddy,Direct buried (fully buried) type expansion jointHas a special waterproof and anti-corrosion structure,Universal corrugated expansion jointBuried in the ground for two months. Similar toDouble hinge expansion joint for air-cooled island vacuum pipeline、Large diameter thick wall expansion jointThese non-standard custom parts test the design and welding ability of manufacturers. AndRotary compensator、Sleeve type pipe expansion joint— You think just pulling a standard part can replace it? Block those manufacturers who fool people with general standard parts as soon as possible, so as to avoid major accidents in the later period.