Knowledge Hub

Pump atmospheric head calculator

Type the pad elevation. Atmospheric head is live in metres of water from ISO 2533. This sheet does not invent NPSHA or NPSHR.

Families: industrial pumps. Duty sizing: pump duty calculator.

Worksheet

Elevation in, Hatm out

Site chips left. Live atmospheric head right. Magadi, Kakamega and Olkaria elevations are labelled approximate. Magadi is not a Proxico site. Olkaria is a pad guess — not the 2,434 m summit.

Pad elevation

Site

Pad RL m · Typing here sets Custom RL.

Hatm vs elevation Click the curve to set a custom RL. Pins are named Kenya sites.

Send to Proxico

Result · live

Live

— m

metres of water · ISO 2533

Sea-level Hatm: —
Already gone: —
Site: —
Elevation: —

Judgement

Hatm is not a site NPSHA measurement. HI 9.6.1 puts atmospheric head into NPSHA. ISO 9906 treats NPSHA as an installation number. NPSHR is a curve we do not invent.

Enquiry · from this pad

ISO 2533 · HI 9.6.1 · ISO 9906

Atmospheric head: P = 101325 · (1 − 0.0065 · h / 288.15)^5.256 Pa (ISO 2533 troposphere). Hatm = P / (1000 · 9.81) metres of water.
What this is not: Not a site NPSHA measurement. Not NPSHR. NPSHR lives on the manufacturer curve and is not invented here.

JKIA elevation is a KMD station fact. Magadi, Kakamega and Olkaria are approximate — confirm pad RL before a purchase order.