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The importance of backup rings to O rings

Backup rings are ultimately used to help stop o ring migration, and they achieve this in both static and dynamic fluid power applications as the pressure cycles occur, preventing the extrusion of an o ring in the gap.  Ultimately a backup ring is a rigid ring that...

Gasket manufacturing process explained

Specialist Sealing Products have been providing high-quality gaskets to customers throughout the UK for many years. We pride ourselves in the range of gaskets we have available, suitable for a variety of applications across a range of industries.  Rubber gaskets are...

Designing seals for the food industry

There’s a number of factors to take into consideration when designing seals for the food industry. That’s because seals used within this sector need to work exceptionally hard in all food processing environments where hygiene and health and safety are of the utmost...

Storing your gaskets!

A strange headline for a gasket article, we know.  However, it’s an important area and one, which in this sector is often overlooked.  When we think about most products or items in and around our homes and business, we will recognise that most come with manufacturing...

Flange Gasket materials – What you need to know

Getting the most out of flange gasket materials and ensuring the performance of the gasket is not affected when you come to use it, means several things must be taken into consideration.  For example, factors such as their design, how they’re manufactured, installed,...

Spiral Wound Gaskets and Sheet Gaskets

Gaskets come in a range of different shapes and sizes.  All are offering similar functionality; gaskets are produced using a range of different materials to suit a range and a variety of environmental factors, industrial uses, and product requirements.  When it comes...

Benefits of Kammprofile Gaskets

Used to prevent leakage, gaskets are constructed to fit between a range of different sizes and types of surfaces in order to provide the perfect seal.  Typically used in pipes and heat exchangers, gaskets are widely used as industrial sealants.  Kammprofile gaskets,...

Purpose of a Kammprofile Gasket

The ultimate purpose of a gasket is to stop leaks while being able to deal with varying levels of compression.  When it comes to Kammprofile gaskets, these are ideal for standard pipeline and heat exchanger applications.  As due to their grooved metalcore, with a...

Are your gaskets completely compliant?

In industries where gaskets are not just important but essential, there are numerous challenges to be faced and considerations to take on board.  This is especially true when it comes to making sure this “essential” element is also compliant.  With the implementation...

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...

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.

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