ANSI HI 7.8-2016 PDF

Full title and description

ANSI/HI 7.8-2016 — Controlled-Volume Metering Pump Piping Guideline. Provides recommended piping and accessory requirements for installation of controlled‑volume (pulsating‑flow) metering pumps and discusses the effects and interactions of inlet (suction) and outlet (discharge) piping on metering system performance.

Abstract

This guideline applies to controlled‑volume metering pumps (examples: hydraulic‑coupled disc and tubular diaphragms, mechanical disc diaphragms, packed piston and plunger designs). It explains typical upstream and downstream piping arrangements, accessories, and installation practices intended to optimize accuracy, repeatability and reliability of metering systems where pulsating flow and positive‑displacement pumping are used.

General information

• Status: Superseded (2016 edition; later revised as ANSI/HI 7.8-2021).
• Publication date: 2016.
• Publisher: Hydraulic Institute (ANSI‑approved standard).
• ICS / categories: ICS area: Fluid systems and components for general use — Pumps / Fluid power systems (23.080 / 23.100 family); topical categories: Design & Application, Reciprocating / Metering Pumps, Pump Systems & Components.
• Edition / version: ANSI/HI 7.8-2016 (2016 edition; later revised 2021).
• Number of pages: 27 pages (2016 edition).

Scope

Defines piping and accessory requirements and installation guidance for controlled‑volume metering pumps with pulsating flows. Covers interactions of suction and discharge piping with pump performance, typical accessory items, and recommendations to preserve metering accuracy and pump reliability across industries including chemical, water/wastewater, power, petroleum and slurry handling. (Does not replace individual manufacturer instructions where those are stricter.)

Key topics and requirements

• Definitions and nomenclature specific to controlled‑volume metering pumps and pulsating flow devices.
• Recommended inlet (suction) piping arrangements to minimize cavitation, air ingestion and flow disturbances.
• Recommended outlet (discharge) piping, backpressure considerations and accessory selection (e.g., pulsation dampeners, check valves, relief valves) to preserve accuracy and protect pump liquid ends.
• Discussion of how piping geometry and fittings affect metering accuracy, pulsation amplitude and system stability.
• Installation and layout guidance aimed at optimizing repeatability, reducing maintenance, and ensuring safety in common industrial applications.

Typical use and users

Used by pump system designers, process engineers, installation contractors, plant maintenance personnel and manufacturers who specify, install or service controlled‑volume metering pumps in chemical processing, water and wastewater treatment, power generation, petroleum, industrial manufacturing and related sectors. It is a practical reference for ensuring piping choices support metering accuracy and pump longevity.

Related standards

Related Hydraulic Institute standards and guidelines on controlled‑volume pumps and pump system practices (e.g., HI series documents for nomenclature, testing and installation). The 2016 guideline was later revised by ANSI/HI 7.8-2021; users should consult the 2021 edition for updated equations and clarified definitions where applicable.

Keywords

Controlled‑volume, metering pump, metering, piping guideline, pulsating flow, diaphragm pump, piston pump, pulsation dampener, suction piping, discharge piping, Hydraulic Institute, ANSI.

FAQ

Q: What is this standard?

A: ANSI/HI 7.8-2016 is a Hydraulic Institute guideline that provides recommended piping and accessory practices for controlled‑volume (pulsating) metering pumps to support performance and reliability.

Q: What does it cover?

A: It covers inlet (suction) and outlet (discharge) piping interactions with pump performance, accessory selection (e.g., dampeners, check valves), installation practices and factors that affect metering accuracy in pulsating positive‑displacement pumps.

Q: Who typically uses it?

A: Pump/system designers, process and mechanical engineers, maintenance teams, installers and manufacturers working with metering and dosing systems in chemical, water/wastewater, power, petroleum and other industrial applications.

Q: Is it current or superseded?

A: The 2016 edition has been superseded by a revised edition published in 2021 (ANSI/HI 7.8-2021). The 2016 document remains available as an archival edition.

Q: Is it part of a series?

A: Yes — it is part of the Hydraulic Institute’s body of pump standards and guideline publications (the HI 7.x family and broader HI standards addressing nomenclature, application, testing and installation practices).

Q: What are the key keywords?

A: Controlled‑volume, metering pump, pulsating flow, piping, pulsation dampener, inlet suction, discharge piping, Hydraulic Institute, ANSI.