Valid

JB/T 7255-2007Water ring vacuum pumps and compressors (English PDF)

水环真空泵和水环压缩机

Preview PDF

This is a limited preview

Buy now to download the full PDF (15 pages)

Need quotation for your management?

Get a formal quotation for JB/T 7255-2007 in 30 minutes.

Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

August 28, 2007

Implementation date

February 1, 2008

Scope

JB/T 7255-2007 is the English-translated version of 水环真空泵和水环压缩机.

JB/T 7255-2007 is the Chinese standard "Water ring vacuum pumps and compressors". Its scope clause reads: This standard specifies types and basic parameters, specifications, test methods, inspection rules, guarantee, marking, packaging, transportation and storage of water ring vacuum pumps and compressors (hereinafter referred to as "pumps").

This standard is applicable to water ring vacuum pumps and compressors for suction or transportation of gas free of solid particles, insoluble in water, of temperature generally form -10°C to 40°C. Liquid ring pumps use non-aqueous liquid as working solution may made reference to this standard. Its clauses include terms and definitions.

Found what you need?

Document preview — JB/T 7255-2007

National Standard of the People's Republic of China

Replacing: JB/T 7255-1994

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Contents
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Types and Basic Parameters
4.1 Types
4.2 Basic parameters
5 Specifications
5.1 Performance
5.2 Driver
5.4 Critical speed
5.5 Balance
5.6 Vibration
5.7 Noise
5.8 Pressure parts
5.9 External force and torque of inlet and outlet
5.10 Inlet and outlet flanges
5.11 Cover plate (or side cover) and distributor for air suction and discharge
5.12 Impeller
5.13 Shaft and shaft sleeve
5.14 Assembly of shaft sleeve
5.15 Bearing
5.16 Shaft seal
5.17 Coupling
5.18 Foundation
5.19 Materials
5.20 Castings quality
6 Test Methods
6.1 Chemical analysis and mechanical property test of materials
6.2 Hydraulic test
6.3 Performance test
6.4 Vibration measurement
6.5 Noise measurement
6.6 Balance test
7 Inspection Rules
7.1 Type inspection
7.2 Delivery inspection
8 Guarantee
9 Marking, Packaging, Transportation and Storage
9.1 Marking
9.2 Packaging and transportation
9.3 Storage
Table 1 Basic Parameters of Single Stage Water Ring Vacuum Pumps
Table 2 Basic Parameters of Two Stage Water Ring Vacuum Pumps
Table 3 Basic Parameters of Single Stage Water Ring Compressors
Table 4 Basic Parameters of Two Stage Water Ring Compressors

1 Scope

This standard specifies types and basic parameters, specifications, test methods, inspection rules, guarantee, marking, packaging, transportation and storage of water ring vacuum pumps and compressors (hereinafter referred to as "pumps").

This standard is applicable to water ring vacuum pumps and compressors for suction or transportation of gas free of solid particles, insoluble in water, of temperature generally form -10°C to 40°C.

Liquid ring pumps use non-aqueous liquid as working solution may made reference to this standard.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.

GB/T 1348 Spheroidal Graphite Iron Castings

GB/T 2100 Corrosion-resistant Steel Castings for General Applications (GB/T 2100-2002, eqv ISO 11972:1998)

GB/T 4662 Rolling Bearings - Static Load Ratings (GB/T 4662-2003, ISO 76:1987; ISO 76:1987/AMD.1:1999, IDT)

GB/T 4879 Rustproof Packaging

GB/T 6391 Rolling Bearings - Dynamic Load Ratings and Rating Life (GB/T 6391-2003, ISO 281:1990; ISO 281:1990/AMD.1:2000; ISO 281:1990/AMD.2:2000, IDT)

GB/T 9239.1-2006 Mechanical Vibration - Balance Quality Requirements for Rotors in a Constant (Rigid) State - Part 1: Specification and Verification of Balance Tolerances (ISO 1940-1:2003, IDT)

GB/T 9439 Grey Iron Castings

GB/T 11352 Carbon Steel Castings for General Engineering Purposes (GB/T 11352-1989, neq ISO 3755:1991)

GB/T 13306 Plates

GB/T 13384 General Specifications for Packing of Mechanical and Electrical Product

GB/T 13929 Methods of Testing for Water-ring Vacuum Pumps and Compressors

JB/T 4127.1 Specification for Mechanical Seals

JB/T 4127.3 Technical Requirement on Product Reception of Mechanical Seal

JB/T 4297 Painting Specification for Pumps

JB/T 8097 Methods of Measuring and Evaluating Vibration of Pumps

JB/T 8098 Methods of Measuring and Evaluating Noise of Pumps

3 Terms and Definitions

For the purposes of this document, the following terms and definitions apply.

3.1 suction capacity

Suction capacity of water ring vacuum pump refers to the gas volume, in m3/min, get through the pump inlet within unit time, at specified degree of vacuum of the inlet and outlet atmospheric pressure of 1013.25 hPa […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Referenced standards

Cited by

Similar standards

JB/T 14164-2022|GB/T 13929-2024|GB/T 13930-2024|JB/T 10770-2019|JB/T 11238-2011|JB/T 2231.4-2013

Editions of JB/T 7255

Edition	Title	Revision	Status
JB/T 7255-2007	Water ring vacuum pumps and compressors	current edition	Current
JB/T 7255-1994	Water ring vacuum pumps and compressors	previous edition	Superseded

This page sells the current edition, JB/T 7255-2007. Earlier editions are listed for reference only.

How to Download JB/T 7255-2007

1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.