The following companies are certified:
As at 2025-01-28Certifications of companies according to DVGW guideline W 120-1
Company | Scope of certification | Certificate-Reg.-No. | Expiry |
Stölben GmbH Barlstr. 42 D-56856 Zell | A4, B2, B4 | 600001.500.22135 | 30.09.2027 |
BOG Bohr- und Umwelttechnik GmbH Eselsteig 17 D-07586 Caschwitz | A4, B2, B4 | 600052.500.24137 | 03.04.2031 |
Gerätebau Wiedtal Schützeichel GmbH & Co. KG Auf dem Schützeichel D-53577 Neustadt (Wied) | A4, B2, B5 | 600128.500.25064 | 15.01.2032 |
Certifications of companies according to DVGW guideline W 120-2
Company | Scope of certification | Certificate-Reg.-No. | Expiry |
Stölben GmbH Barlstr. 42 D-56856 Zell | G200 | 600001.500.22146 | 30.09.2029 |
Certifications of companies according to CEN ISO/TS 24283-3
Company | Scope of certification | Certificate-Reg.-No. | Expiry |
Stölben GmbH Barlstr. 42 D-56856 Zell |
| 600001.501.22134 | 30.05.2027 |
Abbrevitions:
Installion of wells
A1 - well diameter larger than DN 400
A2 - well diameter up to DN 400
A3 - well diameter up to DN 300
A4 - well diameter up to DN 150
boreholes
B1 - dry drilling methods deeper than 75 m
B2 - dry drilling mehtods up to a depth of 75 m
B3 - hydraulic circulation drilling methods deeper than 300 m
B4 - hydraulic circulation drilling methods up to a depth of 300 m
B5 - hydraulic circulation drilling methods up to a depth of 100 m
Well regeneration
R1 - mechanical regeneration
R2 - chemical regneration
Restoration and dismantling
S1 - annular space sealing
S2 - insertion casing
S3 - washover/pipe cut
S4 - backfilling/partial backfilling
S5 - dismantling
Geothermal heat excahnges (BHE)
G200 - BHE up to a depth of 200 m