5.Understand the pump curve at three critical points:

- Churn (zero flow)

- Rated flow

- 150% of rated flow

6. Jockey Pump

This smaller pump maintains system pressure under normal conditions, compensates for minor leakage, and starts and stops automatically based on system pressure so the main fire pump is not activated unnecessarily.

7. Driver and Control

The pump is driven by either an electric motor or a diesel engine and is controlled by a dedicated fire-pump controller (with battery charger and batteries where required).

8. Engineering Checklist

- Hydraulic demand (flow and pressure)

Available water supply

Suction conditions (NPSH, pipe size, length)

Required discharge pressure

- Pump curve (duty point and 150% flow)

Driver capacity (hp/kW)

Electrical or fuel arrangement

- Equipment listing/approval

- Installation configuration

- AHJ requirements

9. Testing & Acceptance

Installation and acceptance testing under NFPA 20 are distinct from routine inspection, testing, and maintenance under NFPA 25. Always follow the acceptance-test requirements for flow, pressure, and duration carefully.

10. Key Takeaway

A fire pump is never selected by flow rate alone. It must satisfy the full hydraulic demand while complying with the applicable NFPA requirements, adopted codes, and AHJ criteria.

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🔥 ONE MEASUREMENT CAN HIDE A PROBLEM.

🔹 Redundancy → more than one measurement of the same critical variable
🔹 Voting logic → compares multiple inputs before taking defined action
🔹 Diagnostic coverage → helps identify certain sensor or signal faults

For critical functions, the design may use 2oo3, 1oo2 or other voting architectures, depending on the required safety integrity and system design.

WHY THREE SENSORS INSTEAD OF ONE?

DEEBOM ENGINEERING ACADEMY
Oil & Gas Master Class

#SafetyInstrumentation #SIS #ProcessSafety #DeebomEngineeringAcademy

MECHANICAL SEALS - DESIGN, SELECTION & RELIABILITY

1 Purpose----

Mechanical seals are critical components in rotating equipment, particularly pumps. Their primary function is to control leakage from the seal chamber and prevent air from entering the pump.

2 Essential Components-----

A mechanical seal consists of:

Primary sealing elements - rotating and stationary faces

Secondary sealing elements - dynamic and static seals

Hardware - drive, loading, and adaptive elements

Reliable sealing depends on maintaining the correct lubricating film between the sealing faces.

3 Seal Arrangements----

Mechanical seals can be classified by arrangement:

Single

Dual

Cartridge

Hydrostatic Pressure Testing - Inspection Perspective

Hydrostatic testing is a critical stage of mechanical integrity and quality assurance, used to verify the strength and leak-tightness of pressure-containing equipment and piping.

Key Inspection Points: Approved test procedure & test pack

Correct test pressure as per applicable Code/Project

Specification

Calibrated pressure gauges

Proper venting and complete air removal

Controlled pressurization and pressure holding

Visual examination for leakage at welds, joints, flanges & fittings

Recording pressure, temperature and test duration

Typical ASME Code References:

ASME B31.3- Para. 345 Leak Testing

ASME BPVC Section VIII, Div. 1- UG-99

Hydrostatic Test

ASME B31.1- Hydrostatic testing requirements for

Power Piping

The applicable Code edition, project specification and client requirements shall always govern the actual test requirements.

GoLive +1

Quality Inspection | TPI | Mechanical Integrity |

Hydrostatic Testing

#Hydrotest #Hydrostatic

### 🔧 90° Elbow vs 2 × 45° Elbows

In piping design, the way you change direction matters.
A 90° elbow creates a sharper flow direction change, while two 45° elbows can provide a smoother transition—but require more material, space, and installation work.

Good piping design = balancing pressure loss, cost, space, and installation.

#PipingEngineering #PipelineEngineering #PipeFittings #Elbow #90DegreeElbow #45DegreeElbow #PressureLoss #FluidFlow #Hydraulics #MechanicalEngineering #MEPEngineering #PipingDesign #EngineeringKnowledge #FireFighting #FireProtectionEngineering #EngineeringTips

MEP Project Manager: One Person, Many Expectations!

Managing MEP services is far more than engineering -it is the art of balancing competing priorities, tight timelines, and multiple stakeholder expectations on a single job site.

Here is a reality check on what an MEP Project

Manager balances every day:

The Multi-Directional Tug-of-War

Client: "I want it FASTER!" (Prioritizing early handovers and commissioning).

Top Management: "I want it CHEAPER!" (Focusing on value engineering and strict budget control).

MEP Design Team: "I want QUALITY!" (Ensuring engineering design standards and specifications are never compromised).

Which Instrument is Used to Measure Pressure?