Flex Band Bow Casing Centralizer

ASTA Flex Band Bow Casing Centralizer is a further developed bow spring casing centralizer introducing the flexible bands/end collars. This feature enables the casing centralizer to be dismantled and stored in flat mode, allowing cost saving in the sense of minimum storage space requirement, smaller packaging dimension and ease of transportation handling. The centralizer constitutes a unique interlocking braid between the end collar and bow spring, designed to achieve a strong singular unit. ASTA Flex Band Bow Casing Centralizer is fully compliant with API Specification 10D for both starting & running force and well exceeding the requirements of API Specification 10D for restoring forces.

Overall design features of the Flex Band Bow Casing Centralizer include the following:

  • Spring steel bows with rounded edge profile designed for safety reason and to minimize damage on casing wall or other equipment which traversed by the centralizer. The bows are heat treated and harden-tempered to achieve appropriate strength and consistent spring characteristics.
  • Band/End collar hinges are folded toward inside. This design feature is carefully engineered to minimize the collar stretch which tends to occur when centralizers encounter tapers, commonly found in certain type of pipe connections.
  • Flat dismantled mode allows more than 50% saving of storage space & cost of transportation while increasing shipping quantity by three fold.
  • Ease of use allows faster installation time and convenient assembly and installation in limited space.
  • Starting & Running Force meets the requirements of API Spec 10D the latest edition.
  • Restoring Force exceeds the requirements of API Spec 10D the latest edition.
  • Various spring bow heights are made available to accommodate the required casing-to-hole configuration.
  • Available in Welded and Non Welded Latch on Type.
  • Semi Rigid Single and Double/Tandem Bow Type for higher restoring force usage.
Table 1: ASTA Flex Band Casing Centralizer Specification
Casing Size (in) Hole Size (in) Number of Bow Band ID (in) Average Bow OD (in) Average Length (in) Max. Starting / Running Force (lbf) Min. Restoring Force at 67% stand off (lbf)
7 8-1/2 ~ 12-1/4 4 / 6 7-1/8 9 ~ 12-3/4 22 1040 1040
7-5/8 9-1/2 ~ 12-1/4 4 / 6 7-3/4 10 ~ 12-3/4 22 1056 1056
8-5/8 9-1/2 ~ 12-1/4 4 / 6 8-3/4 10 ~ 12-3/4 22 1440 1440
9-5/8 12-1/4 ~ 14-3/4 6 / 8 9-3/4 14 ~ 15-1/4 22 1600 1600
10-3/4 12-1/4 ~ 16 6 / 8 10-7/8 14 ~ 16-1/2 22 2040 1020
11-3/4 14-3/4 ~ 16 6 / 8 11-7/8 15-1/8 ~ 16-1/2 22 2160 1080
13-3/8 16 ~ 17-1/2 6 / 8 13-1/2 16-1/2 ~ 18 22 2440 1220
16 20 ~ 22 6 / 8 / 10 16-1/8 20-1/2 ~ 22-1/2 26 2600 1300
18-5/8 22 ~ 26 8 / 10 / 12 18-3/4 22-1/2 ~ 26-1/2 26 3500 1750
20 24 ~ 26 8 / 10 / 12 20-1/8 24-1/2 ~ 26-1/2 26 3760 1880
Notes: Other size & requirement are available based on request.

Ordering Suggestions
To ensure correct size and type of equipment during order placement, please specify:
1. Casing O.D on which the equipment will be used.
2. Hole size or casing I.D in which the equipment will be placed.
3. Any restriction through which the equipment will be run.

Product Picture

Flex Band Bow Casing Centralizer Flex Band Bow Casing Centralizer
The rounded edge profile of bow for safety reason