Work it out.
Calculators
Is my epoxy and isocyanate certificate valid?
BEK 1978/2021 § 16, § 30, subsections 7-8 + annex 10
Butt welding of PE pipes
DVS 2207-1 (as at 2023), via SIMONA work.info 10/2023
Sum value for air pollution
BEK 613/2026 § 3, subsection 3 + annexes 1 and 2
Epoxy mixing ratio (A:B)
Forholdsregning · forhold fra dit eget datablad
Epoxy/coating consumption per area
Geometri + rækkeevne fra dit eget datablad
Airflow for negative pressure ventilation
Ventilationsregning · luftskifte fra din egen arbejdsplan
Asbestos — 8-hour time-weighted average (TWA8)
AT-grænseværdi · Bekendtgørelse om grænseværdier for stoffer og materialer (kemiske agenser) — 0,003 fibre/cm³
Asbestos air measurement — required sampling time
NIOSH 7400 (PCM-fiberoptælling) · 25 mm-kassette, Ac = 385 mm²
Plastic welding — recommended nozzle temperature (hot air)
DVS 2207-3 · SIMONA work.info 10/2023, tabel 10 (målt 5 mm inde i dysen) — tjek dit datablad
Plastic — linear expansion with temperature change
Fysik (ΔL = L·α·ΔT) · koefficienter fra GPA.dk / Metalindustrien.dk
Epoxy — pot life at a different temperature
Tommelfingerregel (Q10) · ASTC Global — potlife halveres ca. hver 10°C stigning
Epoxy — max. mix quantity relative to pot life
Planlægningsregning · rate × tid (egne tal fra datablad/erfaring)
Asbestos waste — number of big bags
Affaldsplanlægning · vægt/m² og big bag-kapacitet (kommunalt eksempel)
Negative pressure — purge time by air change rate
Ventilationsteknik · eksponentiel fortyndingsligning (idealiseret fuld omrøring)
Welding wire — consumption and number of spools
Erfaringsregel · svejsetråd-forbrug ≈ sømlængde pr. streng
Extrusion welding — material consumption in kg
Geometri + densitet (Holm & Holm A/S materialedata)
Pipe welding — number of joints and welding time
Planlægningsregning · egne erfaringstal pr. samling
Tools that work in all subjects
Whatever your programme is called, these tools calculate the same — Pythagoras, area, percentages and units are not tied to one trade.
- Pythagorasa² + b² = c²Find the missing side, set out a right angle, check whether a room is square, and find the space diagonal.
- Area and perimeterm²Rectangle, triangle, trapezium, circle and composite shapes — area and perimeter.
- Volume and surface aream³ · lBox, cylinder, cone, sphere, pyramid, prism, pipe and frustum — also in litres.
- Percent%Percentage of, how many per cent, percentage change, discount and VAT.
- Scale and ratios1 : 50From drawing to reality, area and volume to scale, the rule of three and dividing in a ratio.
- Unit convertermm ↔ mFrom mm to km, Pa to bar and kB to GB — with the unit staircase.
- Time calculations and the clockt : minTime between two clock times, add time, and 1.75 h = 1 h 45 min for the timesheet.
- Slope and fall% · ° · 1:xFall from level to level, in per cent, per mille, degrees and mm per metre — and the height difference.
- Material consumption including wastem² + %Boards, paint, battens at c/c spacing and packs — for a composite surface or a whole room, with waste.