Blaw Knox K9906

Contents

• Overview
  • General data
• Can be confused with
• Lines
• Tower forms
  • Examples
• Tower details

Overview

Blaw Knox K9906 is a 66 kV distribution tower type. The Blaw Knox K9906 drawings were used for scheme SWE SL11; the D30 at least was used on an SL4 scheme. The details of these schemes are not known. K9906 is depicted in [NSP/004/030] where it is listed as a “Knursling” type (intended to read Nursling, now a suburb of Southampton). The “Knursling” type has “Typical Tower Types in the family” “D3(s)”, D30, D60, DT and DTV. Northern Powergrid give the standard conductors as 100, 150 or 175 mm² ACSR with 60 or 70 mm² ACSR earthwire. The meaning of “s” in “D3(s)” is not known.

In addition to the Nursling area, the same towers can also be found in Gloucestershire. Whether both types share the K9906 designation is not presently known.

General data

Can be confused with

• Baby PL16 (66 kV?)
• NWE SL4
• ca. 1945 standard 66 kV
• PL16 (D3)
• Eve 0.4 (D10, D30)

Lines

Lines discovered to date:

• Lydney substation to Ryeford substation in Stonehouse, both in Gloucestershire, England. The tower numbering is unclear. Tower ZLYD1 is at Lydney and numbering continues up to a junction to Lydney–Elton outside Hall Farm PV Substation. The line is then ZLYDA up to ZLYDA35 at Netherhills substation (the 37th tower). The line from Netherhills to Ryeford substation appears to be ZRYT numbered from the Ryeford end.
• A short line outside of Nursling, Southampton on a combination of K9906 towers and wood poles.

Both lines have been de-rated to 33 kV. The line at Lydney retains its 66 kV insulators except for the downleads on the terminal tower.

Tower forms

The following diagrams are shown to scale at 12 pixels per metre:

The GA&ED drawings for the terminal (DT) tower with sealing end termination omits the actual cable sealing ends, so these have been loosely approximated based on similar towers from other series.

Examples

The D10 tower is assumed to be such from the approximately 10–11° angle it carries; D10 and D30 are almost identical. All examples are in the Lydney woodland and were photoghraphed during pylon hunt 30, 6th July 2024.

Tower details

Total width is the width between the outer phase conductor attachment points (the conventional measurement on towers). The steelwork projects a little further beyond these points.