EN 16752:2015

Centrifugal pumps - Test procedure for seal packings

This European Standard gives details of a test procedure for packings to be used to seal the stuffing boxes of centrifugal pumps. It gives provisions on the design of test equipment, standard test parameters and reporting criteria. It does not specify performance criteria which should be agreed between supplier and customer, but does define 3 tightness classes.
When necessary, this European Standard is also applicable to packings used on other rotary equipment such as mixers and agitators.

Kreiselpumpen - Abnahmeprüfung für Packungen

Diese Europäische Norm legt Details eines Prüfverfahrens für Packungen fest, die verwendet werden, um Stopfbuchsen von Kreiselpumpen abzudichten. Es werden Festlegungen für den Entwurf von Prüfeinrichtungen, Standardversuchsparametern und Berichtskriterien festgelegt. Es werden keine Leistungskriterien angegeben, die zwischen Lieferant und Kunde vereinbart werden sollten, sondern drei Leckageklassen definiert.
Wenn nötig, kann diese Europäische Norm auch für Packungen in anderen Rotationsanwendungen wie Mischer und Rührer angewendet werden.

Pompes centrifuges - Procédure d'essai pour garnitures tressées

Le présent document donne un descriptif détaillé d'une procédure d'essai pour les garnitures tressées destinées à assurer l'étanchéité des presse-étoupes des pompes centrifuges. Il donne des préconisations sur la conception des équipements d'essai, les paramètres d'essai standard et les critères de compte-rendu. Il ne répertorie pas les critères de performance qui doivent être convenus entre le fournisseur et le client, mais distingue néanmoins 3 classes d’étanchéité.
Lorsque cela est nécessaire, le présent document est aussi applicable aux garnitures tressées utilisées sur d’autres dispositifs rotatifs tels que les mélangeurs et les agitateurs.

Centrifugalne črpalke - Preskusni postopek za zaprto embalažo

Ta dokument določa podrobnosti preskusnega postopka za embalažo, ki se uporablja za zatesnitev tesnilnega prostora centrifugalnih črpalk. Navaja določila glede zasnove preskusne opreme, standardnih preskusnih parametrov in meril za poročanje. Ne določa meril učinkovitosti na podlagi dogovora med dobaviteljem in odjemalcem, ampak določa tri razrede tesnosti.
Po potrebi se ta dokument uporablja tudi za embalažo za drugo rotacijsko opremo, kot so mešalniki in mešala.

General Information

• Status: Published
• Publication Date: 08-Sep-2015
• Withdrawal Date: 30-Mar-2016
• ICS: 21.140 - Seals, glands
• ICS: 23.080 - Pumps
• Technical Committee: CEN/TC 197 - Pumps
• Drafting Committee: CEN/TC 197/WG 3 - Test Procedure for Packings for Rotary Applications
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 03-Oct-2021
• Completion Date: 14-Apr-2025
• Ref Project: SIST EN 16752:2015 - Centrifugal pumps - Test procedure for seal packings

Overview

EN 16752:2015 - "Centrifugal pumps - Test procedure for seal packings" (CEN) specifies a standardized test method for packings used to seal stuffing boxes (packing glands) of centrifugal pumps. The standard defines test-facility design, instrumentation, standard test parameters and reporting criteria. It does not set pass/fail performance levels - instead it defines three tightness classes (T1, T2, T3) and leaves final acceptance criteria to supplier/customer agreement. Where relevant, the procedure can also be applied to packings for other rotary equipment (mixers, agitators).

Key topics and requirements

• Test arrangement & apparatus: detailed layout for circulation, pressure control and instrumentation (test shaft, gland follower, retaining plate, bearings, drive). Shaft alignment tolerance ≤ 0.10 mm and shaft speed control within ±5%.
• Instrumentation & measurements: separate leakage measurement for shaft and gland, inlet/outlet fluid temperature, gland follower temperature (probe ≤ 3 ± 0.5 mm from outer ring), continuous torque measurement for frictional power.
• Material & surface specs: shaft and housing in corrosion‑resistant stainless steel (e.g. per EN 10088-1); shaft hardness ≥ 40 HRC; surface roughness limits - stuffing box bore ≤ 1.6 µm Ra, shaft ≤ 0.4 µm Ra; dimensional tolerances h10/H10 per EN ISO 286-2.
• Standard test conditions: clean water medium, inlet temperature 20 °C (‑5 / +10 °C), shaft diameter 40–65 mm, packing cross‑section 9.5–12.7 mm, surface speed 8–9 m/s, test pressure 0.6 MPa ±0.1 MPa.
• Tightness classes: defined total leakage over the 100 h test (excluding break‑in):
  • T1: ≤ 5 ml/min
  • T2: ≤ 15 ml/min
  • T3: ≤ 30 ml/min
• Procedure & duration: includes break‑in (typically <1 h) with controlled leakage bedding-in, then continuous test of minimum 100 h; maximum of 3 gland adjustments allowed during the test (excluding break‑in). Minimum two complete tests per packing type.
• Reporting: mandatory graphical time-series for temperatures, pressure, shaft/gland leakage and normalized power consumption; final report must include packing ID, test speed/pressure/duration, average power and gland temperature, and tightness class achieved.

Applications and users

This standard is essential for:

• Pump manufacturers and OEMs validating packing performance
• Packing material and seal manufacturers for product development and specification
• Independent test laboratories performing acceptance or comparative testing
• Procurement and engineering teams specifying sealing systems for centrifugal pumps, mixers and agitators
• Maintenance and reliability engineers assessing seal selection and lifecycle performance

Related standards

• EN ISO 286-2 (tolerance system h10/H10)
• EN 10088-1 (stainless steel grades) Use EN 16752:2015 to ensure repeatable, comparable test data on seal packings and to support supplier/customer discussions about acceptable leakage and operational performance.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kreiselpumpen - Abnahmeprüfung für PackungenPompes centrifuges - Procédure d'essai pour garnitures tresséesCentrifugal pumps - Test procedure for seal packings23.080ýUSDONHPumps21.140Tesnilke, mašilkeSeals, glandsICS:Ta slovenski standard je istoveten z:EN 16752:2015SIST EN 16752:2015en,fr,de01-november-2015SIST EN 16752:2015SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16752
September
t r s w ICS
t sä s v râ
t uä r z r English Version
Centrifugal pumps æ Test procedure for seal packings Pompes centrifuges æ Procédure d 5essai pour garnitures tressées
Kreiselpumpen æ Abnahmeprüfung für Packungen This European Standard was approved by CEN on
s August
t r s wä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s w CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s x y w tã t r s w ESIST EN 16752:2015

Packing test report template . 11 Annex B (informative)
Typical graphical representation of results . 14 Bibliography . 15
Key 1 tank 2 valve 3 direction of flow 4 pump 5 pressure container 6 water circulation pump 7 pressure gauge 8 flow measurement 9 drain 10 inlet temperature gauge 11 outlet temperature gauge 12 testing apparatus 13 alternate return line 14 heat exchanger Figure 1 — Test arrangement The testing apparatus shall be compliant with the description given in Figure 2. In particular, it shall consist of a suitable housing for retaining the test fluid and either one or more stuffing boxes to house the test packing. Each stuffing box shall be fitted with a gland follower and suitable retaining plate capable of controlled axial adjustment. There shall be a test shaft mounted on suitable bearings and attached to a suitable drive mechanism. SIST EN 16752:2015

Key 1 motor 2 test shaft 3 gland follower 4 stuffing box 5 test packing 6 torque measurement 7 gland follower temperature 8 water in 9 water out 10 shaft leakage measurement 11 gland leakage measurement Figure 2 — Testing apparatus details The testing apparatus shall also conform to the following additional requirements: a) the shaft speed shall be controlled within a maximum variation of ± 5 %; b) the test head shall be designed and constructed so as to maintain stuffing box bore alignment relative to the shaft axis within 0,10 mm; c) the design of the test head and support shall ensure minimum vibration; d) the surface roughness of the stuffing box bore shall be no worse than 1,6 µm Ra. The surface roughness of the shaft shall be no worse than 0,4 µm Ra and the shaft shall be free of helical machine marks; e) shaft and housing shall be manufactured from corrosion resistant stainless steel (e.g. 1.4016 or 1.4404 in accordance with EN 10088-1) without surface coating and shaft hardness shall be 40 HRC minimum; f) the tolerances on shaft and stuffing box bore shall be h10 and H10 respectively in acco
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