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Clauses 5 and 8 of this part are mandatory, and the rest are recommendatory.
GB 18241 consists of the following five parts under the general title Rubber lining:
——Part 1: Anticorrosion lining for equipment;
——Part 2: Lining for grinding mills;
——Part 3: Rubber lining for floatation machine;
——Part 4: Anticrrosion lining for flue gas desulfurization.
——Part 5: Anticorrosion lining with high temperature resistance for equipment.
This is Part 1 of GB 18241.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB 18241.1-2001 Rubber lining - Part 1: Anticorrosion lining for equipment; the following main changes have been made with respect to GB 18241.1-2001:
——The term and definition of lining are modified (see clause 3; clause 3 of Edition 2001);
——The classification method of lining is modified (see 4.1; clause 4 of Edition 2001);
——The mark method of lining is modified (see 4.2; clause 5 of Edition 2001);
——The technical requirements and performance index are adjusted (see clause 5; clause 6 of Edition 2001);
——The inspection rules of lining are modified (see clause 7; clause 8 of Edition 2001);
——The method for testing for integrity of rubber linings is modified (see Annex A; Annex B of Edition 2001);
——The construction and acceptance requirements of rubber anticorrosion lining are modified (see Annex B; Annex C of Edition 2001);
——Annex A of Edition 2001 is deleted.
This part was proposed by China Petroleum and Chemical Industry Association.
This part is under the jurisdiction of SAC/TC 35/SC 7 Technical Subcommittee on Rubber Goods of National Technical Committee on Rubber & Products of Standardization Administration.
The previous edition of this part is as follows:
——GB 18241.1-2001.
Rubber lining - Part 1：Anticorrosion lining for equipment
1 Scope
This part of GB 18241 specifies the terms and definitions, classification and product mark, requirements, test methods, inspection rules as well as marking, packaging, transport and storage of rubber anticorrosion lining (hereafter referred to as “lining”).
This part applies to the rubber lining that is laminated to the to-be-lined equipment to prevent the equipment from being corroded by the medium.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties
GB/T 531.1 Rubber vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness)
GB/T 1690 Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
GB/T 7760 Rubber, vulcanized or thermoplastic - Determination of adhesion to a rigid substrate - 90 degrees peel method
GB/T 11211 Rubber, vulcanized or thermoplastic - Determination of adhesion to metal - Two-plate method
HG/T 3845 Ebonite - Determination of impact strength
HG/T 3849 Ebonite - Determination of tensile strength and elongation at break
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
heat-vulcanized rubber lining
lining formed by vulcanizing in a heated manner the unvulcanized rubber plate which is pasted on the to-be-lined equipment with adhesive
3.2
pre-vulcanized rubber lining
lining formed by pasting the rubber plate vulcanized in advance on the to-be-lined equipment with adhesive
3.3
self-curing rubber lining
lining formed by vulcanizing under natural condition the unvulcanized rubber plate which is pasted on the to-be-lined equipment with adhesive
4 Classification and product mark
4.1 Classification
4.1.1 The lining shall be classified into two categories by whether it needs to be heated and vulcanized after construction:
a) heat-vulcanized rubber lining, represented by J;
b) non-heat-vulcanized rubber lining:
1) pre-vulcanized rubber lining, represented by Y;
2) self-curing rubber lining, represented by Z;
4.1.2 The rubber plate used for lining shall be classified into two categories by the hardness after the completion of vulcanization:
a) hard rubber, represented by Y;
b) soft rubber, represented by R.
4.1.3 See Table 1 for the classification of lining.
Table 1 Classification of rubber lining
Classification Heat-vulcanized hard rubber lining Heat-vulcanized soft rubber lining Pre-vulcanized soft rubber lining Self-curing soft rubber lining
Code JY JR YR ZR
?
4.2 Mark
4.2.1 Mark method
The product shall be marked in the sequence below, and the mark contents may be added as required:
Product name, category, rubber type, temperature resistance level and standard number.
4.2.2 Mark example
Example: The heat-vulcanized hard natural rubber lining with a service temperature range of 70℃＜T≤85℃ shall be marked as follows:
5 Requirements
5.1 Specification/dimension and deviation
The specification/dimension and deviation of the rubber plates used for lining shall meet those specified in Table 2.
Table 2 Specification/dimension and deviation of rubber plates used for lining
Thickness Width deviation/ mm
Nominal dimension /mm Deviation/%
2, 2.5, 3, 4, 5 and 6 －10~＋15 －10~＋15
Note: Other specifications/dimensions shall be determined through negotiation between the Supplier and the Demander.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and product mark
5 Requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transport and storage
9 Requirements for equipment bases
10 Requirements for anticorrosion construction process
Annex A (Normative) Testing for integrity of rubber linings
Annex B (Normative) Construction and acceptance of rubber anticorrosion lining
