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GB/T 6556-2016Type, Main Dimension, Material and Marking of Mechanical Seals (English PDF)

机械密封的型式、主要尺寸、材料和识别标志

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

Level / Type

National · Recommended

Issue date

August 29, 2016

Implementation date

March 1, 2017

Scope

GB/T 6556-2016 is the English-translated version of 机械密封的型式、主要尺寸、材料和识别标志.

GB/T 6556-2016 is the Chinese standard "Type, Main Dimension, Material and Marking of Mechanical Seals". Its scope clause reads: This Standard specifies the type, main dimension, marking and material code of mechanical seals for centrifugal pumps and similar rotary machines.

This Standard applies to single and double mechanical seals. Its clauses include application scope; type and main dimension; marking; for cartridge seals, 0 for non-cartridge seals (o can be omitted); for cartridge seals, 0 for non-cartridge seals (o can be omitted).

It was issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on 2016-08-29 and took effect on 2017-03-01.

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Document preview — GB/T 6556-2016

National Standard of the People's Republic of China

ICS: 21.140
Classification: J 22

Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

Foreword...3
1 Application Scope...4
2 Normative References...4
3 Type and Main Dimension...4
4 Marking...10
5 Material Code...11

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 6556-1994, Type, Main Dimension, Material and Marking

of Mechanical Seals. Compared with GB/T 6556-1994, the major changes are as

follows, in addition to editorial changes.

-- it adds BU double mechanical seal type;

-- it adjusts the marking of mechanical seal.

This Standard was proposed by China Iron and Steel Association.

This Standard shall be under the jurisdiction of the National Standardization Technical

Committee on Mechanical Seals (SAC/TC 183).

The main drafting organizations of this Standard. Hefei General Machinery Research

Institute, Hefei General Environment Control Technology Co., Ltd., Sichuan University,

Beijing University of Chemical Technology, Jiangsu Huaqing Fluid Technology Co., Ltd.

1 Application Scope

This Standard specifies the type, main dimension, marking and material code of

mechanical seals for centrifugal pumps and similar rotary machines.

This Standard applies to single and double mechanical seals.

2 Normative References

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition dated applies to this document. For

undated references, the latest edition of the referenced documents (including all

amendments) applies to this Standard.

GB/T 1804-2000, General Tolerances – Tolerances for Linear and Angular

Dimensions Without Individual Tolerance Indications

GB/T 10444, Method of Type Establishment for Mechanical Seals

3 Type and Main Dimension

3.1 General requirements

All types of mechanical seals may be of the structures shown in Figure 1 ~ Figure 6,

but the dimensions given shall be followed. The figures give the examples in which O

ring is used as stationary auxiliary seal ring; the seal rings of other sectional types may

also work as stationary auxiliary seal ring. The dimensional tolerances not specified

shall be as specified in GB/T 1804-2000, grade f.

3.2 Single mechanical seal type

U type. unbalanced single mechanical seal. See Figure 1.

B type. balanced single mechanical seal. See Figure 2.

4 Marking

4.1 Marking of single mechanical seals

The marking of single mechanical seals is as follows.

EXAMPLE. 108-0-N-R-055-QBPFF indicates type 108 single mechanical seals of.

non-cartridge type seal (0), design type N, right rotation (R), nominal diameter d1 55

mm (055), rotary ring material silicon nitride (Q), stationary ring material graphite

impregnating resin (B), auxiliary seal ring material nitrile rubber buna (P), spring

material chrome-nickel steel (F) and other structural members' material chrome-nickel

steel (F).

4.2 Marking of double mechanical seals

The marking of double mechanical seals is as follows.

EXAMPLE. UB191-0-080-UAVFF/UBPFF indicates UB191 double mechanical seals

of. unbalanced medium side (U), balanced atmospheric side (B), non-cartridge seal

(O), nominal diameter 80 mm (080), medium side materials including rotary ring

material Co base tungsten carbide (U), stationary ring material graphite impregnating

metal (A) and auxiliary seal ring material fluororubber (V), spring material chrome-

nickel steel (F) and other structural members' material chrome-nickel steel (F),

atmospheric side materials including rotary ring material Co base tungsten carbide (U),

stationary ring material graphite impregnating resin (B), auxiliary seal ring material

Material code (see 5.1)

Nominal diameter of mechanical seals, expressed with 3 digits; add

"0" in front if less than 3 digits

Direction of rotation (R for right, L for left and S for any direction)

Type of mechanical seal design (N, K)

1 for cartridge seals, 0 for non-cartridge seals (o can be omitted)

Type of mechanical seal (as specified in GB/T 10444)

Material code (see 5.1)

Nominal diameter of mechanical seals, expressed with 3 digits; add

"0" in front if less than 3 digits

1 for cartridge seals, 0 for non-cartridge seals (o can be omitted)

Mechanical seal type number (as specified in GB/T 10444)

......

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 11 pages — is available in the English PDF.

Referenced standards

Normative references

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