API St 527-2014 rus PDF

Full title and description

API STD 527 — Seat Tightness of Pressure Relief Valves, 4th Edition (2014) — Russian language version. This document specifies test methods, acceptance criteria and procedural requirements for determining the seat tightness (leakage) of metal‑ and soft‑seated pressure relief (safety) valves, including conventional, bellows and pilot‑operated designs. It is the Russian translation of the API Standard published by the American Petroleum Institute (API).

Abstract

API STD 527 (2014, 4th edition) defines standardized procedures to verify valve seat tightness using air (or nitrogen), saturated steam and water as test media. It establishes maximum allowable leakage rates for metal‑ and soft‑seated valves across a wide range of set pressures and effective orifice sizes, includes alternative procedures for open‑bonnet designs, and contains safety guidance for personnel performing leakage checks. The Russian edition presents these requirements in Russian for use by manufacturers, test laboratories and end users operating in Russian‑language environments.

General information

• Status: Superseded (historical edition; replaced by API STD 527, 5th Edition, published 1 July 2020).
• Publication date: 1 November 2014 (4th edition, Russian translation).
• Publisher: American Petroleum Institute (API); Russian translation published/distributed by standards resellers and translation services.
• ICS / categories: 23.060 (Valves) — Fluid systems and components for general use.
• Edition / version: 4th edition (2014) — Russian language version.
• Number of pages: Typically 13 pages (standard short form).

Scope

This standard applies to seat tightness (leakage) testing of pressure relief valves with metal or soft seats and set pressures typically from approximately 103 kPa gauge (15 psig) up to very high pressures (industry range up to 6000 psig in later editions). It covers test media selection (air/nitrogen, steam, water), defined test pressures (commonly set pressure minus 10% or 5 psig, whichever is greater), measurement/observation methods, allowable leakage limits by valve type and size, and special procedures for open‑bonnet valves and pilot‑operated designs. The purchaser may specify tighter limits when required.

Key topics and requirements

• Definitions and classification of metal‑seated and soft‑seated pressure relief valves (including conventional, bellows, pilot‑operated types).
• Specified test media: air or nitrogen (near ambient), saturated steam, and water (near ambient).
• Standard test pressures: generally 10% below nameplate set pressure or 5 psig below set, whichever is greater; procedural details for stabilizing and observing leakage.
• Maximum allowable leakage rates: numeric limits for metal‑seated valves based on effective orifice size and pressure range; zero‑leakage (no visible or audible leakage for 1 minute) requirement for soft‑seated valves under most test media.
• Alternative test procedure for valves with open bonnets (reduced leakage limits for metal seats; same zero‑leakage criterion for soft seats).
• Test apparatus, measurement methods and practical guidance (use of mirrors/indirect observation for safety, calibration, test setup).
• Safety and procedural notes for personnel performing seat tightness checks (personal protection, containment of discharge, precautions when inspecting outlet).

Typical use and users

Used by valve manufacturers for factory testing and quality control, by repair and service shops for post‑overhaul verification, by refinery and petrochemical plant maintenance teams for acceptance testing and periodic inspection, and by procurement/inspection authorities to set and verify contractual leakage requirements. Test laboratories and certification bodies also use this standard as a reference for performing standardized seat‑tightness tests.

Related standards

Commonly referenced standards and documents include API Std 526 (Flanged Steel Safety Relief Valves), API 520 (Sizing, Selection, and Installation of Pressure‑Relieving Devices — Parts 1 and 2), ASME and ISO/EN standards on safety devices and valve testing (for example ISO/EN standards on safety devices for protection against excessive pressure), and manufacturer product specifications. Later editions of API STD 527 (5th edition, 2020) supersede the 2014 text and contain updated references and clarifications.

Keywords

API STD 527, seat tightness, pressure relief valve, safety valve, leakage testing, metal‑seated valve, soft‑seated valve, valve testing procedures, air test, steam test, water test, acceptance criteria, open‑bonnet valves, Russian translation.

FAQ

Q: What is this standard?

A: API STD 527 (4th edition, 2014) is an API standard that defines methods and allowable leakage limits for seat tightness testing of pressure relief valves. The version referenced here is the Russian‑language edition of the 2014 publication.

Q: What does it cover?

A: It covers test media and procedures (air/nitrogen, saturated steam, water), specified test pressures, measurement/observation techniques, maximum allowable leakage rates for metal and soft seats, alternative procedures for open‑bonnet valves, and safety guidance for testers.

Q: Who typically uses it?

A: Valve manufacturers, repair/service facilities, plant maintenance and inspection teams in oil & gas, petrochemical and other industries where pressure‑relief devices are used, plus independent test laboratories and procurement/quality engineers.

Q: Is it current or superseded?

A: The 2014 (4th) edition is superseded. API published a later edition (5th edition) on 1 July 2020; users should consult the 2020 edition for the most current API requirements unless contracts or regulatory references specifically require the 2014 text.

Q: Is it part of a series?

A: Yes. API STD 527 is part of a set of API standards related to pressure‑relief devices and valves, used alongside standards such as API 520 (sizing and installation) and API 526 (flanged steel safety relief valves), and is aligned with other national and international valve and safety device standards.

Q: What are the key keywords?

A: Seat tightness, leakage rate, pressure relief valve, safety valve, metal‑seat, soft‑seat, air test, steam test, water test, acceptance criteria, open‑bonnet, API STD 527, Russian translation.