Metalliteollisuuden Standardisointiyhdistys

The principle of the method specified is to distil a prepared flux solution with sodium hydroxide to expel the ammonia present in the flux, to pass the resulting distillate into a standard sulfuric acid solution, to titrate the excess acid with sodium hydroxide solution and to calculate the ammonia content of the flux. Applies to fluxes of class 3.1.1 only, as defined in ISO 9454-1.

This document specifies the field of application, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical, and the acoustic characteristics of controllable backflow preventers with reduced pressure zone Family B Type A.This document covers controllable backflow preventers of Family B Type A, with reduced pressure zones, intended to prevent pollution of potable water by backflow, caused by backsiphonage or by backpressure. It is applicable to controllable backflow preventers in denominations DN 6 up to DN 250.It covers controllable backflow preventers of PN 10 that are capable of working without modification or adjustment:- at any pressure, up to 1 MPa (10 bar);- with any pressure variation, up to 1 MPa (10 bar);- in permanent duty at a limited temperature of 65 °C and for maximum 1 h at 90 °C.It specifies also the test methods and requirements for verifying their characteristics, the marking and the presentation at delivery.

The standard specifies requirements and testing for a single product consisting of a ladder and one separate platform where the platform height in the position of use, is no higher than 1 m and the platform is intended for use by one person at a time.

1.1 This part of EN 500 specifies the common safety requirements for mobile road construction machinery ). The EN 500 series is applicable to mobile road construction machinery as listed in Annex A. When no specific standard exists, EN 500-1 applies.It specifies common requirements for the design and construction of mobile road construction machinery in order to protect workers from accidents and health hazards which could occur during operation, loading, transport and maintenance.Additional specific requirements for certain types of mobile road construction machinery are given in parts 2 to 4 and 6 of this standard.This part of this standard gives safety requirements for all types of mobile road construction machinery and shall be used in conjunction with one of the parts 2 to 4 and 6. These machine-specific parts do not repeat the requirements from part 1 but add to or replace the requirements for the type of mobile road construction machinery in question.Machine-specific requirements in parts 2 to 4 and 6 take precedence over the respective requirements of this stan-dard.For types of mobile road construction machinery not dealt with in parts 2 to 4 and 6, EN 500-1 applies and if for those machinery additional derived risks may arise, these risks have to be taken into consideration.1.2 This European Standard deals with all significant hazards, hazardous situations and events relevant to mobile road construction machinery, when they are used as intended and under conditions of misuse which are reasonably foreseeable (see Clause 4).This European Standard specifies the appropriate technical measures to eliminate or reduce risks arising from the significant hazards as specified in Clause 4.1.3 This European Standard applies to machines which are manufactured after the date of publication of this European Standard by CEN.

This document specifies the minimum requirements for the protection of helium cryostats against excessive pressure, including the specific risks associated with cryostats for superconducting magnets and cryostats for superconducting radio-frequency cavities, coldboxes of helium refrigerators and liquefiers as well as helium distribution systems including valve boxes. It includes risk assessment, protection concepts, dimensioning of pressure relief devices, types of pressure relief devices, substance release and operation of helium cryostats.In order to fulfil the aim of this document, the characteristics of pressure relief devices are taken into account.