1. Why must the transportation of the compensator be fixed? How tragic are the consequences of being unfixed?
Let's tell you the truth first. Last year, a customer bought aUniversal corrugated expansion jointWhen loading, I felt that it was only a few kilometers anyway, so I was too lazy to tie it up. As a result, there was a sudden brake on the road, and the expansion joint rolled directly from the carriage. The bellows fell out of a pit and the flange was deformed. Go to the site to test, air leakage-directly scrap. Do you think it's a loss or not?
The compensator looked solid, but it was actually very delicate. WhetherMetal hose、Corrugated expansion jointStillNon-metallic expansion jointNone of their core components (bellows, fabric bands) can withstand severe impact and extrusion. If it is not fixed during transportation, bumps, sudden braking and turning will make the products collide in the car, ranging from scratching the surface coating to flattening the bellows, bumping the flange and damaging the sealing surface. Not to mention those with limit tie rods, such asLarge tie rod expansion jointOnce the limit bolt is loosened, the direction cannot be found during installation.
So, compensator transportation fixation is not a "do-or-don't" thing, but the last insurance from the factory. If you save a few minutes of bundling time, you may have to lose thousands of dollars of product money-I don't have to forget this account, right?
Second, check before loading: first distinguish which type of compensator is in your home
Before you start fixing it, you have to find out what the compensator is on the car. Different types of compensators, the method of transport fixation varies greatly. It is impossible for us to bundle steel barsrubber compensatorRight?
- Metal hoses: IncludesPTFE-lined hose、Special hose for vacuumEtc. It is characterized by slender, soft, and most afraid of flattening and twisting.
- Corrugated expansion joint: IncludesCorrugated expansion joint for power station industry、Metal Corrugated Expansion Joints in Cement Industry、High temperature axial expansion joint、Direct buried (fully buried) type expansion joint、External pressure single axial expansion joint、Compound hinge transverse expansion joint、Straight pipe pressure balanced expansion joint、Curved tube pressure balance expansion joint、Compound straight pipe bypass pressure balanced expansion joint、Sleeve type pipe expansion jointEtc. This part of products usually has bellows and flanges, which are most afraid of bumps and lateral forces.
- Non-metallic expansion joint: IncludesRectangular non-metallic expansion joint、Non-metallic expansion joint (fabric fiber expansion joint)、Rubber PTFE compensatorEtc. It is characterized by fear of moisture, piercing by sharp objects and heavy pressure.
And there's alsoRound Flap Door (Double Seal)、Double-sealed single-axis circular baffle door、Flue gas baffle door、Desulfurization flue gas baffle door、Manual plug-in insulation door、Electric plug-in insulation door、Single-axis double-flapper doorThese products, although not exactly compensators, should also be treated as metal pieces when transported, and pay attention to protecting the sealing surface.
How to judge quickly? The easiest way: see if there is a bellows in the appearance-those with bellows are basically corrugated expansion joints; If the outer skin of the hose is wrapped with a metal braided mesh, it is a metal hose; If it is a cloth or rubber square/circular loop band, it is non-metallic.
3. Three steps of fixed operation: bundling, cushioning and limiting, none of which can be missed
Okay, I know what goods are on the car. Let's talk about the specific operation. Don't be too long-winded, these three steps are indispensable:
Step 1: Strapping
Use packing tape or nylon tightening tape, never use wire rope-wire rope will strangle the surface of the product. The binding point is selected at the root of the flange or at the reinforcing ring, avoiding the bellows and hose body. ForMetal hoseIt is necessary to put a protective sleeve (foam tube or rubber tube) on the outside of the hose and then tie it, otherwise the tightening belt will be directly strangled on the metal braided net, which will easily break the network cable.
How to master the binding strength? Subject to the fact that the product cannot be moved in the carriage, but do not strangle until it deforms. Think about it,Metal rectangular expansion jointThe corner is very fragile to begin with. If the bundle is too tight, the corner will be deflated directly, and the flange surface will be uneven when installing.
Step 2: Pad support
Strapping alone is not enough. Wooden or rubber pads should be placed on the floor of the carriage, and the products should be overhead to avoid direct contact with the metal floor-especially in rainy days, if water is soakedNon-metallic expansion jointThat ring belt sucked water, and it was moldy and cracked as soon as it was installed at the scene.
For products that are stacked in multiple layers (such as small boreUniversal corrugated expansion joint), each layer should be separated by foam board or cardboard to prevent the flange edges from bumping each other. Don't putrubber compensatorAndMetal hoseMixed with stacking, rubber parts are easily pressed out by metal parts.
Step 3: Limit
This step is the easiest to ignore. Many compensators come out of the factory with transport limits-such asexpansion joint tie rodAn adjustment nut on the adjustment nut, or a temporarily welded positioning plate. Check that these limits are secure before departure. If the limit bolt is found to be loose, it must be tightened, otherwise the bellows will expand and contract freely during transportation, resulting in uneven corrugation spacing.
In addition, for hinged expansion joints (e.g.Compound hinge transverse expansion joint), the hinge should be fixed with an additional wooden wedge to prevent the hinge from rotating itself during transportation and causing lateral force.
4. Fixing points of different products: metal hoses should not be flattened, corrugated expansion joints should not be bumped, and non-metal expansion joints should not be damp
This section is a little more detailed, and it is divided into products:
- Metal hose: It must be laid flat, and it is prohibited to stand up or fold in half. If the length of the hose exceeds 2 meters, add support points in the middle to prevent sagging and deformation. ForPTFE-lined hoseThe PTFE layer is particularly afraid of scratches, so the outer packaging must be kept when bundling, and hard cable ties should not be used.
- Corrugated expansion joint: WhateverCorrugated expansion joint for power station industryStillMetal Corrugated Expansion Joints in Cement IndustryProtective cover should be installed on the bellows (it can be wrapped with thick cardboard or foam board), and heavy objects are strictly forbidden to pile up. The flange face should be placed upward or sideways, and never let the flange be directly stressed. ForExternal pressure single axial expansion jointNote that the external pressure cylinder is easy to be hit and dented. It is recommended to add wooden strips on both sides of the cylinder for protection.
- Non-metallic expansion joint：Rectangular non-metallic expansion jointAndNon-metallic expansion joint (fabric fiber expansion joint)It must be wrapped tightly with waterproof membrane. If it is a rainy day at the time of delivery, the carriage should also be covered with tarpaulin. In addition, the non-metallic loop belt itself is elastic, so it should not be deformed under compression for a long time during transportation, otherwise it will not be recovered. It is recommended to fill the inside of the loop band with sponge support.
- Special Products：Rotary compensatorThere are rotating bearings, and the rotation angle should be locked during transportation to prevent the bearing from being injured during shaking.Double hinge expansion joint for air-cooled island vacuum pipelineThe size is large, so pay attention to the position of the center of gravity when loading to avoid rollover caused by eccentric load.
After unloading, I found that the product appearance was fine, but I couldn't install it once I installed it? Eighty percent is slight distortion in transit. Therefore, to fix this matter, it is better to be tight than loose, and it is better to have more than less.
5. Pits when unloading and removing fixing parts: Don't cut the cable tie in a hurry, first see if the limiting device is still there
When you arrive at the scene, don't rush to take scissors and cut all the straps. Do two things first:
First, check whether the limit rod and temporary positioning plate are intact. Before, some customers tried to save trouble, and after cutting the cable tie, the tie rod nut was loosened. As a result, the bellows popped out with a "bang" and almost hurt people. The correct method is: firstly confirm that the expansion joint does not displace during transportation, and then follow the steps in the installation instructions,Step-by-step removal of limiting device。 For products with tie rods, wait until the pipeline is connected and the installation reference is found before loosening the tie rod nut (refer to FAQ Article 12 "How to adjust the tie rod nut of expansion joint").
Second, see if there is any damage. EspeciallyNon-metallic expansion jointIf water stains or damage are found on the outer packaging, immediately unpack the check ring to see if it is not damp. If the loop is already wet, it needs to be dried in a ventilated place before installation, otherwise it will bulge and crack when heated.
Don't be brutal when unloading the goods. The sling should be hung on the flange or lifting lug, and never strangle it directly on the bellows. Large-ticket products (such asLarge diameter thick wall expansion joint) To use a special hoisting balance beam, single-point hoisting can easily lead to the deflection of the center of gravity, and no one will pay for it if it falls.
Compensator Transport FixedThis matter looks small, but one oversight is enough for you to drink a pot. From loading inspection to unloading and disassembling parts, each link follows these five steps to ensure that your compensator arrives at the site safely. Remember that?