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Medical Grade Seals

When looking at your options for gaskets and seals, you’ll see that some products are marked as medical grade. These seals offer a range of extra benefits and features when compared to your typical seals, and they are required for many different types of processes....

O Ring Face Seals

While you may be familiar with O-rings, these come in various types, which offer benefits to a range of manufacturing applications. Sometimes called a toric joint, O-rings work to seal the area between two different joined parts. This means that even when working at...

Straight Thread Tube Fitting O-Rings

When looking at the types of O-rings on offer for your manufacturing processes, you might be wondering which would be the best solution for your unique needs. Today we’re going to take a deeper look into what straight thread tube fitting O-rings are and how we can...

Can You Use Corrugated Gaskets Instead of Spiral Wound Gaskets?

If you’ve always relied on spiral wound gaskets in the past, you might be wondering if there is an alternative option on offer. Corrugated gaskets offer many benefits over spiral wound gaskets, which is why so many companies are opting to switch between these two...

What is a Wiper Seal?

An important component that’s often overlooked by businesses and manufacturers is the wiper seal. If you are wondering what a wiper seal is, today we’re going to discover why you need to use them and how they can support your work. Go to the homepage for more...

How to Choose the Right Seal for Electric Motors

When choosing a seal for your electric motors, there are many options on the market. Finding the right electric motor shaft seal is critical to ensure your customers are happy and that your vehicles fit their needs. Keep reading to discover how to choose the right...

Why Should You Invest in Quality Seals?

While industrial seals might seem like something you could save a little money on, this is one part that we don’t recommend cutting costs on. A quality seal will offer many benefits to your business and operations, so it’s worth taking the time to find a solution...

All you need to know about Neoprene O rings

Popular in the refrigeration industry, neoprene o rings are also growing in popularity across a wide range of other sectors due to their incredible resistance to hazardous materials. Also known as chloroquine o rings, these o rings provide excellent resistance to...

Why all sealants are not the same

It's important to understand just how critical it is to use the correct type of sealant. It's especially the case when working with heavy machinery or any industrial situation. You don't want to have to worry about whether your sealing products are working correctly...

How to understand O-rings and their design

O-Rings are a critical component for the proper sealing of specific pipes. They have to sit within a specified groove, which can vary based on the hardware used. That's why it's important to note the various types of o-ring groove design to understand better what kind...

How to tighten your bolts perfectly

How to tighten your bolts perfectlyHow to tighten your bolts and which tools you should use to achieve the perfect seal is not as seamless and straightforward as we would like. Various factors come into play in these situations, such as bolt grade, size, and even application type. 

Tightening torques in this sense can therefore become a minefield.   

However, it remains vital to determine the optimum tightening torque for each application as every bolted joint is unique. 

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Bolt tensioning safety is crucial – but what is torque? 

Torque is a rotating force measuring force multiplied by distance. Where distance equals the length of the wrench, and the force is the force you apply. 

What does a correctly tightened bolt look like? 

When a gasket spiral is tightened correctly, it will stretch like a rigid spring, connecting two surfaces securely and as long as the two loads do not exceed each other, then the components/two mating surfaces will not pull apart. 

As you continue to rotate the bolt, the stretching and tightening will continue; however, how much tension you require depends on several factors. 

  1. Bolt diameter is an important area to acknowledge as it will take more force to tighten a ¾ – 10 bolt compared to a 318-16 bolt.
  2. Bolt grade– depending on the material’s strength, it will take more force to stretch an SAE Grade 8 bolt than it does to stretch an SAE Grade 5, for example.
  3. Nut factor– also known as the friction coefficient, this element considers the bolting surface, i.e., those that are hard, smooth, and sleek require less torque than those that are softer, rougher, and stickier.

Taking these factors into account and combined will allow you to opt for the correct torque tightening level. 

Note:  The torque tightening value is only valid if all the application aspects remain constant, and each application should be evaluated on its own to determine the optimum torque value. 

Determining the required torque 

This, as we’ve mentioned, does depend on the spiral wound gasket’s material properties and its overall purpose. 

However, we know that achieving proper torque is essential as if they are under torqued, bolts will deform and won’t provide a solid clamping force. Alternatively, an over-torqued bolt will simply break and give no protection. 

The bolt tightening sequence 

As the most well-known and common sequence, a Star pattern is typically applied to all types of gasket materials, particularly to spiral wound gaskets UK. 

This sequence is then applied when torquing a bolted flange in assembly. 

Of course, gasket type, arrangement of flange connections, etc., still all determine which tightening sequence will be most suitable (we’ll look at some others later in this post). 

Ultimately, the aim is not to damage the gasket in the process of torquing. 

The Star procedure 

Following a star pattern, each flange bolt goes through a process of tightening, which starts at applying between 20-30% force, and then following the same pattern again going over these bolts applying 50-7-% force value, before finally using a rotational pass, stopping when the bolt stops turning.  For spiral wound gaskets, typically two passes will be required to ensure optimum torque. 

Other sequences to note: 

Modified star bolting pattern – an advance on the original star pattern, this sequence is much quicker when you’re working with applications with 20+ bolts; however, it still follows the same star sequence moving from one bolt to the next, applying varying levels of force value. 

Quadrant pattern – a more structured sequencing approach, the quadrant sequence avoids the crisscrossing, moving instead a bolt over only after you’ve completed the first sequence. 

Circular pattern – this sequence is suitable only for solid/hard gaskets such as Kammprofiles, making this sequence unsuitable for spiral wound gaskets. 

As the leading supplier of Spiral Wound Gaskets in Leeds, we carry a large stock volume when it comes to gaskets and bolts. To find out more, make sure to check out our pages online or call us on 01535 274 776; we’d be happy to help. 

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Read related post: Spiral wound gasket thickness – what’s best?

Reference video: Nord-Lock Group

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