定价： 689元 / 折扣价： 586 元 加购物车

定价： 260元 / 折扣价： 221 元 加购物车

定价： 156元 / 折扣价： 133 元 加购物车

定价： 156元 / 折扣价： 133 元 加购物车

定价： 156元 / 折扣价： 133 元 加购物车

定价： 78元 / 折扣价： 67 元 加购物车

(It includes GI 2) 1. Scope 1.1 This Standard establishes minimum requirements for electrical work and electrical equipment operating, or intended to operate, in mines and quarries. 1.2 This Standard is intended to be used in conjunction with CS

定价： 683元 / 折扣价： 581 元

1. Scope 1.1 This Standard describes the technical requirements and procedures necessary for the design, performance and testing of new or unused flameproof, diesel-powered, non-rail-bound, self- propelled machines for use in gassy underground mines.

定价： 501元 / 折扣价： 426 元

1. Scope 1.1 This Standard describes the technical requirements and procedures necessary for the design, performance, and testing of new or unused non- rail-bound, diesel-powered, self-propelled machines for use in non-gassy underground mines. 1.2 This

定价： 364元 / 折扣价： 310 元

定价： 345元 / 折扣价： 294 元 加购物车

定价： 345元 / 折扣价： 294 元 加购物车

1. Scope 1.1 This Standard covers the following devices intended for connection to copper conductors only and for installation and use in hazardous locations: Class I, Groups A, B, C, and D; Class II, Group G, in coal or coke dust, and in gaseous mine

定价： 592元 / 折扣价： 504 元

This specification covers limestone suitable for use as dust in coal mines to prevent coal dust explosions. The limestone shall conform to the chemical composition requirements prescribed. The chemical analysis and the particle size analysis of the limestone shall be conducted.1.1 This specification covers pulverized limestone suitable for use as dust in coal mines to reduce risk of coal dust explosions.NOTE 1: Pulverized limestone can serve as a source of incombustible material in coal mine operations. Limestone is dusted onto coal exposures in sufficient amount so that the incombustible content of the combined coal dust, rock dust, other dust, and moisture shall not be less than 80 % of all loose dust (MSHA 30 CFR 75.403). With such a concentration of limestone incombustible material, dust explosions cannot initiate or be propagated from nearby gas explosions. The limestone must be substantially dry in order to dust satisfactorily.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

定价： 481元 / 折扣价： 409 元 加购物车

定价： 605元 / 折扣价： 515 元 加购物车