Hydrant Pressure Gauge Guide

1) What a pressure gauge does

A pressure gauge shows the pressure in your fire system. It helps you check hydrants, pumps, and sprinkler lines. Clear reading = faster service and safer sites.

2) How to choose the right gauge

Range (kPa)

Pick a full-scale range about 1.5× to 2× your normal working pressure. This protects the gauge and keeps the pointer in the best zone.

Fill type

• Liquid-filled: best for vibration and pulsation (pump discharge). The pointer is steady. Longer life.
• Dry: good for stable lines and indoor locations. Lower cost.

Dial size (visibility)

• 110–160 mm: easy to read from far (pump rooms, risers).
• 55–70 mm: compact spaces (cabinets, panels).
• 37 mm: service gauges for extinguisher work.

Entry and mounting

• Bottom entry: fits tees and valves on pipe runs.
• Rear entry: fits panel mounts; neat in cabinets.

Thread type

Match the thread. PT (BSPT) and NPT are different. Do not mix. Check size: 1/8", 1/4", 3/8", 1/2".

Environment

• High vibration → choose liquid-filled and consider a snubber.
• Moisture / outdoor → sealed case and regular checks.
• Heat sources → keep within rated temperature.

3) Installation (quick steps)

1. Isolate and depressurise the line. Wear PPE.
2. Confirm thread & size. Use the correct adapter if needed.
3. Seal with PTFE tape or approved sealant. Do not over-wrap.
4. Tighten by hand, then with a wrench on the spanner flats. Do not twist the case.
5. Position the dial upright for easy reading.
6. For liquid-filled models: set the vent plug as per instructions after install.
7. Re-pressurise slowly. Leak check. Record a baseline reading and date.

4) Safety notes

• Never remove a gauge while the line is under pressure.
• Do not exceed the gauge’s full-scale pressure.
• Use the correct thread type every time. No force fit.
• Keep away from excess heat and direct impact.
• For oxygen or special media: use clean, oil-free instruments rated for that service.

5) Good use & maintenance

• Run the system mostly in the middle of the scale (about 30–80%).
• If the pointer shakes, add a snubber or use a liquid-filled gauge.
• Monthly quick check: leaks, fogging, zero position at no pressure.
• Compare with a reference gauge during service. Replace if out of tolerance.

6) Why choose FFA gauges

• High quality components and steady readings.
• Wide range: from low pressure to 4500 kPa and compound (vacuum) models.
• Multiple sizes and entries for easy fit on site.
• Competitive pricing without compromise on reliability.
• Fast selection help from our team when you need it.

View Gauges & Specs