Technical Specification

In our experience we have encountered many defined twisted tapes specifications. Below, you can find some of the most common ones.

If there is a different retaining method preference or if there are specification tolerances available, including other materials please let us know by using the spec check…

  • Specification #1
  • Specification #2
  • Specification #3
  • Specification #4
  • Specification #5
  • Specification #6

Spec #1 – Flat Ends with Holes

This specification comes with a typical 25mm flat length with a 3-5 mm centre hole at both ends, retained using keywire.

Typical application This type of retaining method has been used in Shell and tube heat exchangers with access to both tube sheets
Twisted Tape width range 8 - 55mm
Material Any material available in strip form
Specification #1

Spec#2 – Rivetted Flat Tail at Rear

This specification comes with a typical 25mm flat length and a 3-5 mm centre hole at one end (usually outlet tube sheet) and a centre riveted core anchor type retaining method.

The core anchor will self-retain the twisted tapes at the inlet tube sheet.

Typical application This type of retaining method has been used on plug header type air-cooled heat exchangers where there is a minimum fluid backflow
Twisted Tape width range 10 - 55mm
Material Normally restricted to stainless steels
Specification #2

Spec#3 - Key Ring Fitted at Rear End

This specification comes with a typical 25mm flat length and a 5 mm centre hole at both ends and a centre hole fitted with a 2mm wire locking ring (2 turns, 25mm OD).

If there is access to both tube sheets, the opposite end can also be fitted with a key ring on-site, once a twisted tape has been installed, to keep it in place in case of fluid backflow concerns.

Typical application This type of retaining method has been used on air-cooled heat exchangers
Twisted Tape width range 18 - 22 mm (mostly used in 1’’ tubes, but not restricted to this size. Other size key rings are available, upon request)
Material Normally restricted to stainless steels
Specification #3

Spec#4 – Flat Length with Hole
(U Tube)

Being the most common type of twisted tape that we have delivered, this specification comes with a typical 25mm flat length at both ends but with only one end having a centre hole, retained using keywire or welded rods to the tube sheet.

Typical application This type of retaining method has been used in Shell and tube heat exchangers with access to only one tube sheet
Twisted Tape width range 8 - 55mm
Material Any material available in strip form
Specification #1

Spec#5 – Extended Flat Length
with Hole

This specification comes with a typical 25mm flat length at one end (no centre hole) and a bespoke flat length (normally between 50-150 mm) and a centre hole for retaining purposes. A bespoke flat length is possible at both ends also, if required.

With access to one single tube sheet, final retaining can be performed either using keywire (passing through welded lugs) or welded rods to the tube sheet.

Typical application This type of retaining method has been used on LNG vaporisers (U-tube type shell and tube heat exchangers)
Twisted Tape width range 8 - 55mm
Material Any material available in strip form
Specification #1

Spec#6 – Extended Flat Length
with Holes at Both Ends

This specification comes with a typical 25mm flat length and a 3-5 mm centre hole at one end and a bespoke flat length (normally between 50-150 mm) and a centre hole for retaining purposes.

A bespoke flat length is possible at both ends also, if required.

Typical application This type of retaining method has been used in Shell and tube heat exchangers with access to both tube sheets.
Twisted Tape width range 8 - 55mm
Material Any material available in strip form
Specification #1

Quick Twisted Tape
Specification Check

Use our Twisted Tape specification tool to check the manufacturing feasibility of your twisted tapes.

Please use this function to input your twisted tape or tube specification details, in order for us to confirm if we can produce to your spec requirements.