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EN 12952-7:2012

Arrangement and function with regard to operational requirements; c Limiting devices, e. For operation of plants without permanent supervision, the following requirements shall also apply. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards.

The 129527 allowable pressure shall be indicated by a fixed and readily visible red mark on the pressure gauge.

If water is blown down, the quantity of blow down water shall be fully considered when rating the second feed pump; Li ce ns ed C op y: The quantity of water used from the feed water reserve for other purposes shall be considered when rat- ing the feed water reserve.

In the case of two-drum boilers with an evaporator tube bundle between them, eb outer tubes shall not be considered as downcomers.

If aqueous solutions are used for cleaning the lower part of the smelt spout covers, special precautions shall be taken to prevent the solution from corroding the boiler wall tubes. The nozzle or ring height shall not exceed 65 mm, or 95 mm in the case of a tapered design. The other pressure holding pump shall have a capacity of approximately 0,2 times the steam generated corresponding to the allowable heat output of the largest of all associated hot water generators.

Water-tube boilers and auxiliary installations – Part Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 50, an inside back cover and a back cover.

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In the case of hot water generators with quick-adjusting heat supply systems this value may be mm. This standard is identical to: Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards. If the hot water generator can be endanger by the possible intrusion of foreign matter e. Water-side connecting tubes shall always be arranged horizontally to the water level indicators.

Requirements for feedwater and boiler water quality. In case a the glass water gauge need not be in the field of vision of the boiler operator being responsible for feed water supply. If the water level indicators are connected by means of common connecting lines or if the water-side connecting tubes are longer than mm, the latter shall have an inside diameter of at least 40 mm. The lower limit of the indicating range of a glass gauge shall be at least 30 mm below the lowest permissible water level LWL also see 5.

The feed pumps shall be connected to the power sources in such a way that in the case of failure of one power source the remaining feed pumps shall meet the requirements of 5. Assessment of suitability and determination of the tripping points of limiters; d Feed pumps: In the case of totally demineralized feedwater the conductivity shall be monitored automatically. Water-tube boilers and auxiliary installations – Part 5: If any part of the functional test involves delaying the cut-off and lock-out of the heat supply, then the time delay shall not exceed a value specified by the manufacturer.

For undated references the latest edition of the publication referred to applies including amendments. Requirements for flue gas cleaning systems. Inspection during construction; documentation and marking of pressure parts of the boiler. Cylindrical glass gauges shall be provided with a safety device for protection against damage by bursting glass.

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EN – Water-tube boilers and auxiliary installations – Part 7: Req –

wn By exception, steam operation of all feed pumps from only one steam main shall be permissible. Design and calculation for pressure parts of the boiler. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member.

The steam pressure may be controlled automatically instead of the temperature. The temperature limiter shall respond, at the latest, when the allowable flow temperature of the hot water generator is exceeded. Additional measures shall be taken if the water losses in the total system exceed the capacity of the largest pressure holding pump. Two safety devices limiters shall be installed as low water protection in order to prevent the water walls from 12925-7 heated to an unacceptable extent e.

A flow limiter or a temperature limiter shall be in- stalled for low water protection in order to prevent the water walls from being heated to an inadmissible extent. Requirements for grate and fluidized bed firing systems for solid fuels for the boiler. All safety accessories shall fulfil the requirements in modules B and D; g Pressure generation devices in the case of hot water plants with external pressure generation. Gives requirements for equipment for steam boilers and hot water generators.

Pressure gauges shall comply dn the requirements of EN Determination of trip points and, if necessary, testing of change-over; h Non-return valves, shut-off and drain devices: Where duplicate isolating devices are installed in series, but not adjacent to each other, the intervening tubework shall be provided with means for venting and condensate removal. The device in accordance with 7.