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Standards & Practices

Quality & Compliance

Quality and compliance are built into how E4 operates — not treated as add-ons.

Where required, E4 provides functional testing and Factory Acceptance Testing (FAT), supported by documentation suitable for long-term reference.

Quality at E4 is ultimately measured by field performance, not paperwork.

E4 works with organizations that value clarity, accountability, and predictable execution, including:

Engineering accuracy and correct application

Verification and testing before equipment reaches the field

Clear, traceable documentation

Alignment with applicable standards, specifications, and project requirements

Explore Pump Systems

What We Do

E4 supports projects where equipment performance, reliability, and execution discipline matter.

Our core capabilities include:

Pump systems for municipal, commercial, industrial, and energy applications

Valve automation for quarter-turn and multi-turn valves

Actuation using pneumatic, hydraulic, and electric technologies

Equipment coordination, testing, and documentation to support installation and operation

We focus on doing fewer things — correctly and consistently.

Who We Serve

E4 works with organizations that value clarity, accountability, and predictable execution, including:

Municipal water and wastewater utilities

Commercial building owners and facility teams

Industrial, chemical, and energy operators

OEMs, EPCs, and contractors

We focus on doing fewer things — correctly and consistently.

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API Valve & Pressure Relief Standards

API 520-1 — Sizing & Selection of Pressure-Relieving Devices(Part I)

Our core capabilities include:

Scope & Purpose

  • Governs how pressure relief valves (PRVs) are sized and selected
  • Applies to refineries, petrochemical plants, and process facilities
  • Covers gas, vapor, steam, two-phase, and incompressible flow

Key Technical Content

  • Relief scenarios:
    - Fire exposure
    - Blocked outlet
    - Thermal expansion
    - Control valve failure
    - Gas blow-by

Calculation methods for:

  • Required relieving area
  • Flow coefficients
  • Backpressure corrections

Defines overpressure limits:

  • Normal relief: 10%
  • Fire case: 21%

Why It Matters

  • Prevents vessel rupture
  • Used by process engineers to
    determine orifice size (API 526)
  • Incorrect sizing = catastrophic
    failure risk

API 520-2 — Installation of Pressure-Relieving Devices (Part II)

8th edition (Aug 2023)

Scope

  • Governs how PRVs must be installed, not how they’re sized

Key Requirements

  • Inlet piping:
    - Pressure drop limits
    - Straight-run requirements
  • Outlet piping:
    - Backpressure limits
    - Drainage & support
  • Installation orientation:
    - Vertical only (unless otherwise approved)
  • Discharge to:
    - Flare systems
    - Vent stacks
    - Atmosphere (with restrictions)

Why It Matters

  • Even a correctly sized PRV can
    fail if installed improperly
  • One of the most commonly
    violated standards during plant audits

API Standards vs Valve Type — Applicability Matrix

Overview of API standards and their applicability to different valve types.

Legend
  • ✓ — Primary governing standard
  • ○ — Supplementary / referenced
  • — — Not applicable

1. Isolation & Control Valves

API Standard Gate Globe Check Ball Plug Butterfly
API 600 ✓ — — — — —
API 602 ✓ ✓ ✓ — — —
API 603 ✓ — — — — —
API 594 — — ✓ — — —
API 599 — — — — ✓ —
API 608 — — — ✓ — —
API 609 — — — — — ✓
API 598 ✓ ✓ ✓ ✓ ✓ ✓

Key Notes

  • API 598 applies to almost every manual isolation valve as the baseline inspection & pressure test standard.
  • API 600 / 602 / 603 are gate-valve specific and differ mainly by size, construction method, and corrosion intent.
  • API 594 is check valves only — never gate/globe/ball.

2. Fire Testing Standards (Critical for Safety Specs)

API Standard Gate Globe Check Ball Plug Butterfly
API 607 — — — ✔ ✔ ✔
API 6FA ✔ ✔ ✔ ✔ ✔ ✔

Key Notes

  • API 607 → Soft-seated
    quarter-turn valves only
  • API 6FA → Broad fire
    testing (often used for pipeline & metal-seated valves)

3. Pipeline Valves (Midstream / Transmission)

API Standard Gate Ball Plug Check
API 6D ✔ ✔ ✔ ✔
API 598 ✔ ✔ ✔ ✔
API 6FA ✔ ✔ ✔ ✔

Key Notes

  • API 6D requires:
    - Full bore / piggable design
    - Low-leakage sealing
    - Fire testing
  • API 6D valves almost always reference API 598 for testing

4. Upstream / Wellhead Valves

API Standard Gate Choke Check Special Valves
API 6A ✔ ✔ ✔ ✔
API 6FA ✔ ✔ ✔ ✔

Key Notes

  • API 6A valves are not interchangeable with refinery valves
  • Much higher pressure classes and qualification requirements

5. Inspection, Qualification & Asset Integrity

API Standard Applies To
API 574 In-service inspection of piping & manual valves
API 576 In-service inspection of PRVs
API 598 Factory inspection & testing (baseline)

6. Quick “Which API Spec Do I Call Out?” Guide

Valve Type Primary API Spec(s)
OS&Y Gate Valve (Refinery) API 600 + API 598
Small Forged Gate/Globe API 602 + API 598
Stainless Gate Valve API 603 + API 598
Check Valve API 594 + API 598
Ball Valve (Metal Seat) API 608 + API 598
Butterfly Valve API 609 + API 598
Pipeline Ball Valve API 6D + API 598 + API 6FA
Pressure Relief Valve API 520 / 526 / 527
Fire-Safe Quarter-Turn API 607 or API 6FA

ASME (American Society of Mechanical Engineers)