Oil & Gas Quick Presets
Click any card to auto-fill
Wellhead 2K
API 6A · 2,000 psi WP
Wellhead 3K
API 6A · 3,000 psi WP
Wellhead 5K
API 6A · 5,000 psi WP
Wellhead 10K
API 6A · 10,000 psi WP
Wellhead 15K
API 6A · 15,000 psi WP
Pipeline Cl.900
ASME B16.5 · 1,440 psi
Separator Cl.300
ASME B16.5 · 285 psi
Choke Manifold
Cyclic · 150 psi
Pump Suction
Compound · -30inHg/100psi
Pump Discharge
Pulsating · 300 psi, liquid-filled
Gauge Range Selector
ISA 5.1 / ASME B40.100 — Normal reading 60-75% of full scalePer ISA 5.1, gauges should normally operate between 25% and 75% of full scale. Pulsating service: 50% max. Minimum range = Pmax × 1.33 (steady) or × 2.00 (pulsating).
Min Range = Pmax × 1.33 // ISA 5.1 steady service
Min Range = Pmax × 2.00 // ISA 5.1 pulsating / cyclic
Min Range = Pmax × 2.00 // ISA 5.1 pulsating / cyclic
For pump/compressor suction, boiler feedwater, and condensers where pressure may swing below atmospheric — select Compound.
psi
Sizing Results
Minimum Required Range--
Recommended Gauge Range--
Normal Reading Position--
Overpressure Safety Margin--
Live Gauge Dial
Real-time ISA/ASME geometryEnter an operating pressure to preview the live gauge dial.
ISA 5.1 Operating Zones
25-75% — Normal operating band
75-100% — Caution zone
>100% — Exceeds range
Pulsating service: limit to 50% max per ISA 5.1. Liquid-filled gauges recommended for cyclic service.
Pressure Unit Converter
NIST SP 330 — Edit any field to convert all units simultaneouslyEdit any field — all other units update instantly. Base: 1 Pa. Water column at 20C (rho=998.2 kg/m3, NIST). g=9.80665 m/s2.
Differential Pressure Unit Converter
inH2O · mbar · Pa · mmHg · psi — at 20C per NISTDP units for flow, level, and filter monitoring. Water column at 20C (rho=998.2 kg/m3). Enter any value to convert all others instantly.
Automag Level Presets
Click any card to auto-fill (SG, span, pressure)
Crude Oil Storage
SG 0.85 · 2.4 m span · 2.5 bar
Produced Water
SG 1.00 · 3.3 m span · 1.5 bar
LPG / Light HC
SG 0.55 · 2.1 m span · 10 bar
Amine / Glycol
SG 1.20 · 2.8 m span · 3.0 bar
Diesel Fuel Tank
SG 0.84 · 2.5 m span · 1.0 bar
Automag MLG & MTLI Hydrostatic Level Calculator
Center/Center · MAWP at lower nozzle · Float SG selection — ASME B31.3 · API RP 551Sizes Magwell Automag magnetic level gauge and MTLI tubular indicator chambers using P = SG × ρw × g × h. Chamber mirrors vessel; float must be buoyant (SGfloat < SGfluid). Practical span limit 6 m (20 ft).
Range 0.30 – 2.50
Live Automag Chamber
Level: 75%
0%25%50%75%100%
Adjust the slider to preview float position, magnetic-flag deflection, and live hydrostatic head at the lower nozzle.
Engineering Disclaimer: These calculators are reference tools for preliminary instrument selection and sizing based on accepted industry standards (ISA, ASME, IEC, NIST). They do not account for all process variables, installation conditions, or site-specific hazards. All selections must be reviewed by a qualified instrumentation engineer before procurement and installation. Magwell LLC accepts no liability for errors arising from calculator use without professional verification.