SL/T 806-2020 in English

VALID

Fundamental technical requirements for pumps of water and hydropower proj ects

Issued on:2020-11-30
Implemented on:2021-02-28
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $480.00
$466.00

Standard No:	SL/T 806-2020
Document status:	VALID
Title in English:	Fundamental technical requirements for pumps of water and hydropower proj ects
Title in Chinese:	水利水电工程水泵基本技术条件
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2020-11-30
Implemented on:	2021-02-28
Professional Classification:	SL-Water Resources
Related Keywords:	fundamental technical requirements technical requirements key technical requirements standard technical dimensioncentrifugal pumpaxial flow sand-containing water flow condition
Related Topics:	water conservancy hydropower project water pump Ministry of Water Resources Basic technical conditions of water pump hydraulic adjustment system Industrial Pump Technology non-water conditions water pump Water Resources and Hydropower non-water conditions Water Resources and Hydropower Engineering plumber Soil and Water Conservation Technology in Water Conservancy and Hydropower Projects dl/t5113.1-2019 Hydropower and Water Conservancy Capital Construction Project Fire protection in water conservancy and hydropower projects Soft soil foundation construction monitoring technology for hydropower and water conservancy projects Energy dissipation in water conservancy and hydropower projects qcr 806-2020 sl/t247-2020 Power cone sounding technology for water conservancy projects

Introduction

Interpretation of the core content of the standard

Technical dimension	Centrifugal pump	Axial flow pump/mixed flow pump	Tube flow pump
Impeller clearance requirement	≤0.2% impeller diameter	≤0.15% impeller diameter	≤0.1% impeller diameter
Cavitation reference plane	First stage impeller outlet center	Intersection of blade axis and outer edge	0.5D below the highest point of the blade
Vibration limit (mm/s)	4.5 (vertical)/2.8 (horizontal)	3.5 (water guide bearing part)

Analysis of key technical requirements

1. Hydraulic performance guarantee: The efficiency of the prototype pump needs to be corrected through model tests, and the correction formula is Δη=(Re_proto/Re_model)^0.16, where the Reynolds number Re=πDn/ν.

2. Material selection: The sand-containing water flow condition requires a 06Cr13Ni4Mo stainless steel impeller, and the hardness of the flow-through parts must be ≥250HBW.

3. Transition process control: The runaway speed shall not exceed 130% of the rated speed, and the transient pressure fluctuation shall be controlled within ±30% of the design pressure.

Key points for standard implementation

Factory acceptance must include pressure resistance test (1.5 times the working pressure) and 72-hour continuous operation test
When the sand content is greater than 1kg/m³, an additional wear life calculation report shall be provided
Vibration monitoring points shall be arranged at the bearing seat and the inlet and outlet flanges

Standard evolution comparison

Main updates compared to the 2005 version: ①Newly added technical requirements for cross-flow pumps; ②Detailed cavitation margin measurement method; ③Changed vibration evaluation from displacement value to velocity root mean square value.

More samples: DL/T 5154-2012 DL/T 368-2010 JGJ 94-2008

Sample only — not a preview of SL/T 806-2020

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