NEW

Tips for best o ring maintenance

If o rings are not maintained, leaks can occur, and water and other fluids can enter the appliance or application, and even product in the mix!  If this happens, damage can occur to internal parts and mechanisms, causing deployment failings, potential false readings,...

What you need to know about O Ring Lubricants

Silicone grease and lubricants aren’t just a nice to have for o rings, but they can quite often be a must-have.  However, with so many greases and lubricants to choose from, it can often be a minefield choosing the best ones and the right ones for your o ring and...

O Ring Replacement

Replacing an O Ring in pressure washer wands is probably one of the most common replacements you'll find when working with seals.  Unfortunately, O Rings don't last forever, and over time they do deteriorate, and you will require an O Ring replacement.  It's important...

Reasons behind seal failure and a look into seal replacement

Unfortunately, there are occasions where O-rings, in particular, fail.  The failure of these seals is not simply due to one factor, but various factors that can occur across a range of applications – hence why locating the exact cause of such problems is just that, a...

Gaskets and seals for Aerospace

Gaskets and seals used for aerospace applications and equipment must be of premium quality and to a substantially high standard.  They are used across a range of applications such as radars, antennas, lighting, access panels, electrical conductivity, pressure sealing,...

Finding the best sealing materials for Food Grade Applications

You will find rubber seals across various industries, providing an important element and operating as a vital fixing across a wide range of different applications and equipment.  However, these FDA gaskets must follow strict, set guidelines, in terms of their material...

The Evolution of Gasket Solutions

When we talk about gaskets and the history of a gasket, we must start at the very beginning.  What is a gasket?  Ultimately, a gasket is a manufactured seal that is used to fill the gap/space between two or more surfaces.  Gaskets are typically manufactured by cutting...

How to preserve your gasket

Gaskets and seals don’t last forever. However, they are designed, or they should be, last for a considerable period.  In this sense, it is vital to look at ways to preserve your gaskets in order to avoid any application downtime.  Downtime that involves additional...

Important Design Features of Rubber Sealings

When it comes to designing the perfect rubber sealing, there are a few design features to bear in mind to help achieve the optimum solution.  In this post, we explore these rubber sealing features further and provide information on the benefits and best uses for these...

Optimal Squeeze for an O Ring to be effective

A doughnut-shaped seal that is primarily used to stop liquids and air from escaping or getting into specific spaces is the function and role of an O Ring.  Also known as a mechanical gasket, O rings are designed to fit between a groove and a compression during the...

Everything you need to know about Manway Gaskets

Everything you need to know about Manway Gaskets

When it comes to manway gaskets, we want to keep things simple, introducing them as the small sealing ring found in hatches/openings that are constructed for large tanks. Openings which give people access to the inside of the aforementioned tanks and vessels.

The types of tanks we mean include the large tankers which are used for filling and storing liquids — those used within the food, beverage, dairy and pharmaceutical industries.

In this post we’re going to look at manway gaskets in a little more depth, finding out just what they can offer, why they are used and some of the materials they are made from.

Manway Gaskets or Manway Seals

Manway Gaskets can also be known as Manway Seals or in the brewing industry, in particular, Brewery Door Seals (as they’re a seal which is used heavily in this industry, sealing the doors to the actual brewing tanks).

These seals/gaskets can be found in:

  • the food and beverage sectors
  • working farms and large dairy farms
  • certain areas of the pharmaceutical industry

Acting as an industry standard when it comes to keeping liquids and fillings stored safely inside while still allowing for access when required.

These large tanks and containers can be used to store many different types of fluids and materials and manway gaskets can provide the seal for products such as sugar, flour, oils, chemicals, and beverages.

Of course, these small hatches and entranceways need to be properly sealed to stop anything like the above getting out, making manway seals of vital importance.

In this instance, you also need a seal that helps with Non-Accident Releases (NARs), and you need a seal that avoids over-torquing, re-torquing, and ultimately general manway damage.

Materials used for manway seals

Development of manway seals has come a long way over the years with new, tried and tested materials being used reviewing what materials offer the best solutions for businesses who have experience of NARs.

Most manlid door seals are now made with rubber, as it has been reported that hinged and bolt manways have, in the past, been the number one cause of Non-Accident Releases, which has had dramatic consequences for the businesses and individuals involved.

For example, elastomeric gaskets are made from rubber materials including, Buna N, Viton, Nitrile, SBR, and EPDM.

Food grade silicone and EPDM produced gaskets are the most common in the market. Mainly due to their elasticity, meaning they don’t compress and they’re able to deform even under the lightest of loads.

However, silicone gaskets can withstand higher temperatures and are resistant to fungal attacks within tanks. But they do have a poor tolerance to steam.

EPDM manufactured gaskets have a lower upper-temperature limit, but these seals are resistant to steam, as well as ozone, acids, and alkalis.

Specialist Sealing Products (SSP) offer several manway door seals for access doors, vessels, tanks and more. Vulcanizing seals to any dimension, size, and section. From round oval to rectangular we can supply seals in a range of materials all dependant on specific requirements and range of fluid content.

Role of a Manway Seal

Large tankers and vessels etc, are all constructed with a manway so that someone can ultimately get into these big tanks and fix any problems inside, as well as clean them out!

Manways must be large enough for a person to be able to fit through and are most commonly found at the bottom of a tank. Each manway seal is different as the material and type of gasket used will all depend on the contents of what’s inside the container, i.e., the pressure and the temperature of the liquid contained inside.

Every manway needs a gasket/seal to stop it from leaking, and ideally these should be soft, can resist taking on a compression set and where appropriate must be of food grade standard to avoid any contamination.

If manway gaskets aren’t fitted correctly or they become broken, it can result in a full door gasket failure and pose significant safety risks as well as being extremely costly to repair.

SSP uses the latest technology to help overcome such potential issues, designing seals to achieve successful gasket sealing through entire cycles – making our manlid door seals more reliable, sustainable and cost-effective.

Call us on 01535 274 776 to find out more.

Previous

Next

Contact Us
close slider

Your Details

Let us know how to get back to you.


How can we help?

Feel free to ask a question or simply leave a message.