Static Seals

Springsele and Teesele

Springsele and TeeseleSpringsele and Teesele are two seal ranges developed by James Walker to solve problems commonly experienced by manufacturers and users of oilfield equipment.

  • Two double-acting seals for arduous duties
  • Work at extreme pressures and temperatures
  • Effectively seal large extrusion clearances
  • Resist all aggressive oilfield media

Both Springsele and Teesele are double-acting and will effectively seal applications that are subjected to...

  • Extremes of pressure and temperature
  • Attack by oilfield media
  • Large extrusion clearances
  • Arduous mechanical conditions

Springsele is recommended for static duties, whereas Teesele is capable of operating in a dynamic mode. Both seals can operate at high pressures with large extrusion gaps.


Supply commitments
Our standard ranges of both these seals fit housings to SAE AS568A and BS ISO 3601-1 Class A. Non-standard sizes are manufactured to order.

We therefore make the following commitments to our customers, we will...

  • Hold stocks of the most popular 400 series parts in our preferred configuration
  • Not charge mould/tooling costs for 400 series parts, and look to waive mould/tooling charges for other sizes where significant volumes are required
  • Hold stocks locally according to customer demand
  • Design and manufacture custom parts specifically for your application

Preferred design
Springsele is the preferred design for the majority of oil and gas applications (except where the duty is dynamic and Teesele should be used). This is due to the ease of assembly of Springsele and its ability to work efficiently with large clearances. In addition, Springsele is rapidly gaining acceptance as the standard for sealing casing seal receptacles in surface wellheads, where it is often used in conjunction with the James Walker FS Casing and Tubing Seal. Please note that the use of Springsele in applications where relative motion is experienced can result in wear or damage due to metal-to-metal contact between the spring and housing.


Typical applications
These two seals are used for many oil and gas duties, including...

  • Down-hole
  • Wellhead
  • Surface equipment
  • Valves, high-pressure pipelines and riser systems

Both Springsele and Teesele can be...

  • Fitted at original equipment stage
  • Retrofitted in any existing housing designed for O-Rings with back-up rings
  • Custom designed and manufactured to fit non-standard housings

Materials
We have a wide range of HNBR and fluorocarbon materials that can be used for both Springsele and Teesele applications offering key performance characteristics such as resistance to rapid gas decompression, low temperature capability and resistance to oilfield chemicals or sour conditions.

The majority of recommended materials are qualified to Norsok M-710 / ISO93236-2 for rapid gas decompression resistance and sour ageing.

Visit our materials pages or contact the James Walker team for information on the best material choice for your particular application.


Engineering Considerations

Operation
Elastomeric materials have a very high bulk modulus and are virtually incompressible. Therefore, when a Springsele or Teesele is installed, the elastomeric element is deformed slightly in its housing to give a predetermined level of radial seal compression.

The resulting force provides positive fluid sealing at zero system pressure. When system pressure is applied, the elastomeric component deforms further but, because of the initial squeeze, the sealing force always exceeds the force exerted on the seal by the fluid.

This deformation moves the Springsele anti-extrusion spring into the clearance gap of the housing's low pressure side. With Teesele, the anti-extrusion ring is activated by system pressure. These actions effectively prevent extrusion, even at high system pressure.


Operating capabilities
The materials of construction of Springsele and Teesele dictate the seals' temperature capability.

Visit our materials pages or contact the James Walker team for information on the best material choice for your particular application.


Product validation
Both Springsele and Teesele have been validated statically in high temperature oil at: 155MPa (22,500psi) and +140°C (+285°F). Springseles have also been validated by customers under under full API6A PR2 procedures. The most extreme validation was at: 69MPa (10,000psi) from -29°C (-20°F) to +177°C (+350°F). Contact the James Walker team for further details.


Groove fill
Both seals are designed to operate with higher levels of groove fill than conventional O-Rings and O-Ring/back-up systems. It has been proven that high groove fill can enhance RGD resistance.


Seal stretch
Springsele is designed to be stretch-fitted into a groove for external applications, and compression-fitted into a groove for internal applications. In certain circumstances, seals can be retrofitted into non-standard housings, but advice should be sought from our Technical Support Team. Teesele uses rigid plastic back-up rings, and a standard seal cannot be retrofitted into a non-standard housing. Non-standard seals in both formats can be made to order.


Seal squeeze (radial compression)
Both products are designed with a higher level of squeeze than conventional O-Rings. This helps to improve the low temperature sealing performance and RGD resistance, and caters for housing offset in duties with large extrusion clearances.


Installation
Both seal types are easy to install, even in a blind recess. The use of integral anti-extrusion springs in Springsele eliminates the risk of these elements becoming dislodged or damaged during assembly. The anti-extrusion elements of Teesele are bi-directional to prevent incorrect installation. With both seals, particularly when subjected to stab-in, the metal components require a 15 to 30 degree lead-in chamfers.


Seal sizes and configurations
Springsele and Teesele are available in many sizes and configurations. Our standard ranges fit housings to SAE AS568A and BS ISO 3601-1 Class A. There are a number of seal configurations according to the axial dimensions of the housing and the mode of operation...

  • Seal size (AS568a-xxx) where xxx defines the housing ID and/or OD and/or seal radial section
  • Seal axial dimension (long, intermediate or short) according to whether the housing is an O-Ring housing designed for use with or without back-ups, or designed according to available space. Long axial housing depths are preferred as they minimise the risk of seal rotation during assembly and/or operation
  • Configuration (piston or rod), according to whether the seal has external or internal sealing bulges

How it is supplied
There are thousands of potential variants within a single standard such as SAE AS568A or BS ISO 3601-1 Class A. To simplify stockholding and meet the vast majority of customers' applications, we have invested significantly in fast manufacturing techniques to offer customers compressed lead times for these vital ranges of products.


Preferred configuration
We will...

  • Hold stocks of the most popular 400 series parts in our preferred configuration
  • Not charge mould/tooling costs for 400 series parts, and look to waive mould/tooling charges for other sizes where significant volumes are required
  • Hold stocks locally according to customer demand
  • Design and manufacture custom parts specifically for your application
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