Lowering Headframe Masts – Masts

Once you’ve chosen a headframe and central assembly configuration, use the table below to find the appropriate mast.

The mast’s structure is determined by your chosen headframe’s useable headload area (detailed on the previous  pages) and the governing wind speed on your specific site. The mast is supplied as standard with the integral winch. It is also available as an option without.

The table below gives the principal structures and loadings for most requirements. If you need more information on mast structures for particularly high wind loads or speeds, please contact our sales office.

Once you’ve chosen a headframe and central assembly configuration, use the table below to find the appropriate mast.

The mast’s structure is determined by your chosen headframe’s useable headload area (detailed on the previous  pages) and the governing wind speed on your specific site. The mast is supplied as standard with the integral winch. It is also available as an option without.

The table below gives the principal structures and loadings for most requirements. If you need more information on mast structures for particularly high wind loads or speeds, please contact our sales office.

Mast Structures

Height (m) Winch capacity (kg) Product Code Basic site wind speed (m/s) ** Headload capacity (m²) Useable head weight (kg) Mast design information
Hourly mean wind speed (m/s) *** Top/base/flange Ø (mm) Bolt assembly code and PCD* O.T.M (kNm) and shear (kN) Foundation refs.†
Max 3 second gust (m/s) ****
15 275 RLW-15M275S-I1 26 3.466 190 140/438/700 FA30/8/1220/600 104kNm, 8.3kN 150M150, 150P150
28.25
48 3.639
20 275 RLW-20M275S-E1 26 2.566 185 140/457.2/700 FA30/8/1220/600 130kNm, 8.7kN 150M150, 150P150
28.25
48 2.597
20 550 RLW-20M550S-M1 26 4.181 460 140/614/900 FA30/8/1220/800 190kNm, 12.5kN 200M150, 200P150
28.25
48 4.222
25 275 RLW-25M275S-C2 26 2 180 140/478.8/750 FA30/8/1220/650 164kNm, 9.7kN 200M150, 200P150
28.25
48 2.005
RLW-25M275S-C3 26 2.264 180 140/476.8/750 FA30/8/1220/650 176kNm, 10.0kN 200M150, 200P150
28.25
48 2.36
25 550 RLW-25M550S-I1 26 3.025 455 140/626/900 FA30/8/1220/800 222kNm, 13.1kN 300M150, 300P150
28.25
48 3.031
RLW-25M550S-I2 26 4.483 455 140/624/900 FA30/8/1220/800 284kNm, 15.4kN 300M150, 300P150
28.25
48 4.531
30 275 RLW-30M275S-A3 26 1.513 170 140/488.4/750 FA30/8/1220/650 200kNm, 10.6kN 200M150, 200P150
28.25
48 1.506
RLW-30M275S-A5 26 2.295 170 140/484.4/750 FA30/8/1220/650 242kNm, 11.8kN 300M150, 300P150
28.25
48 2.363
30 550 RLW-30M550S-F2 26 3.098 445 140/634/900 FA30/8/1220/800 307kNm, 15.5kN 400M150, 400P150
28.25
48 3.101
RLW-30M550S-F4 26 4.442 445 140/630/900 FA30/18/1220/800 377kNm, 17.6kN 400M150, 400P150
28.25
48 4.509
35 275 RLW-35M275S-C1 26 1.656 165 140/610.8/850 FA30/8/1220/750 290kNm, 14.5kN 300M150, 300P150
28.25
48 1.676
RLW-35M275S-C3 26 2.25 165 140/606.8/850 FA30/18/1220/750 326kNm, 15.4kN 400M150, 400P150
28.25
48 2.225
35 550 RLW-35M550S-D3 26 2.86 440 140/637/900 FA30/18/1220/800 384kNm, 17.3kN 400M150, 400P150
28.25
48 2.928
RLW-35M550S-D7 26 4.33 440 140/631/900 FA30/18/1220/800 474kNm, 19.6kN 500M150, 500P150
28.25
48 4.282
40 275 RLW-40M275S-C1 26 1.842 160 140/678.8/950 FA30/18/1220/850 396kNm, 18.1kN 400M150, 400P150
28.25
48 1.808
RLW-40M275S-C2 26 2.177 160 140/676.8/950 FA30/18/1220/850 422kNm, 18.6kN 500M150, 500P150
28.25
48 2.134
40 550 RLW-40M550S-C6 26 3.047 435 140/668/950 FA30/18/1220/850 503kNm, 20.3kN 750M150, 750P150
28.25
48 2.992
RLW-40M550S-E5 26 4.059 435 140/748/1000 FA30/18/1220/900 586kNm, 23.6kN 750M150, 750P150
28.25
48 3.988

Footnotes:
* All masts employ the same M30, 1220mm length foundation bolt, hot spun galvanised, Grade 8.8.
** Site wind speed: this figure is based on an assumption that site is 1km from the sea at an altitude of 0m.
*** Hourly mean is the UK standard for wind loadings. Many continental European countries specify “10-minute mean” wind speed, which varies slightly. Contact UK sales office for more information.
**** 3 second gust is the wind load design velocity used in many countries.
† For complete foundation details, refer to pages 50-55; the overturning moments (OTM) and shear forces are rounded up to the next level to calculate the suitable foundations for the mast. There is a choice of either passive or non-passive foundations, both of which are non-reinforced. For a reinforced foundation design, use the same code but with ‘R’ replacing the ‘M’ and ‘P’ will fulfill the requirement.

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