THREAD SEALING

Thread Sealing

HOW TO: THREAD SEALING

 

Pipes are widely used to transport and to store various media such as gases and liquids. Threaded connections are used to render a threaded joint leak-proof and pressure-tight.

This tutorial gives you more information about:

Thread sealing methods

Typical stresses and challenges in thread sealing

Curing methods with liquid retaining products

Thread sealing: Additional Knowledge

Learn everything you need to know about the subject of thread sealing.

LOCTITE thread sealants

  • Fill all voids
  • High chemical, thermal and pressure resistance
  • For metal, plastic or combination of both
  • Resistant to shrinkage and vibrations
  • Post-assembly adjustment for both hardening and non-hardening systems
  • Suitable for various thread sizes and pitches

Because of the geometry of a threaded pipe joint and the tightening torque applied some degree of leak-tightness will already exist. However, additional sealing products will give the assembly much greater reliability.

Geometries of pipes

Thread Sealing - Find out more about the pipe geometry parallel to parallel.
Thread Sealing - Find out more about the pipe geometry taper to taper.
Thread Sealing - Find out more about the pipe geometry parallel to taper.

Additional sealing products

Additional sealing products give the assembly much greater reliability:

Conventional methods

Thread Sealing - Sealing cord gives the assembly much greater reliability.

Sealing cord

Liquid methods

Thread Sealing - Hemp and paste gives the assembly much greater reliability.

Hemp & paste

Thread Sealing - Teflon tape gives the assembly much greater reliability.

Teflon tape

Thread Sealing - Silicone thread sealing products give the assembly much greater reliability.

Silicone products

Thread Sealing - Anaerobic thread sealing products give the assembly much greater reliability.

Anaerobic products

Anaerobic products

A liquid thread sealing product cures to a thermoset plastic and creates an integral assembly.

a) Stays liquid in contact with oxygen

b) Cures to a solid thermoset plastic in the absence of air whilst in contact with a metal surface

Thread Sealing - Liquid thread sealing products cure to a thermoset plastic and creates an integral assembly.

Silicone products

Silicones cure with atmospheric moisture releaseing by-products while forming a flexible elastomer.

Ensure, that parts are properly assembled before skin formation.

Thread Sealing - Silicones cure with atmospheric moisture, releasing by-products while forming a flexible elastomer.
  Anaerobic thread sealants
Silikon Produkte Sealing cord
Description Curing when confined within threaded
metal joints
Elastic sealant, hardening by ambient moisture Non-hardening coated multifilament cord with instant sealing capability
Substrates / Thread types • Any type of metal
• Any type of thread
• Plastics
• Metals
• Combination of both
• Metal & plastic tapered threads
• Instant seal
Advantages • Sealing & locking
• Suitable up to burst pressure of pipe
• Excellent chemical resistance

• High flexible sealant
• Big variety of substrates
• Gap filling
• Re-adjustable (45° back off)
• Easy and fast to use
 

Some approvals for thread sealing products are:


• European gas standard

  EN 751-1 for hardening and EN 751-2 for non-hardening sealants


• Potable water standards
  BS 6920, NSF/ANSI Standard 61 or KTW recommendations for plastics in contact with
  potable water.


• Food contact
  NSF category P1 for use in food processing areas


• Oxygen contact
  for use with pure oxygen, BAM testing procedure