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In the case of temperature deviations which can endanger the hot water generator or the hot water generating system, the heat supply and the water supply to this hot water generator shall be cut off and locked out automatically.
EVS-EN – Estonian Centre for Standardisation
In the case of two-drum boilers with an evaporator tube bundle between them, the outer tubes shall not be considered as downcomers. In addition, pressure reading shall always be possible. An indication of the limit values for safety-relevant water levels is sufficient. It shall, however, be ensured in the case of failure of the drive unit provided for normal operation, that a sufficient number of circulating pumps required for cooling of the hot water generators can be kept in opera- tion by means of a second drive unit.
It shall be determined for each plant whether the circulating pumps shall be cut off in addition to the heat supply system; f Hot water generators may be operated in parallel. A water-level indication device shall be so arranged as to make the level “30 mm above the supply pipe outlet opening” visible, or 2 Should the quantity of water contained in the hot water generator not suffice for this purpose, make-up feeding shall be required.
One glass water gauge may be replaced by: Short-time delay of the aforementioned device by a time element is permitted. For solid fuel firing systems, e. Except in the case of unitized arrangements such devices shall be located as close as possible to the steam boiler.
Requirements for flue gas DENOX-systems using liquefied pressurized ammonia and ammonia water solution. About Us Info center Standardization. This shall be done in the vicinity of the sensors for flow temperature measuring and in the vicinity of the tempera- ture limiter e. Cut-off and lock-out of the heat supply system by actuation of the shut-off devices at the control lines may be delayed by means of a time element, in accordance with 4.
This part of this European Standard specifies the essential requirements for equipment and protective devices for water-tube boiler plant as defined in ENto ensure the boiler operates safely within the allowable limits pressure, temperature, etc. Requirements for feedwater and boiler water quality. The steam pressure may be controlled automatically instead of the temperature. Impulse tubes to transmitters can have a smaller inside diameter.
In the case of totally demineralized feedwater the conductivity shall be monitored automatically. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. Requirements for firing systems for pulverized solid fuels for the boiler.
Design and calculation for wn parts of the boiler. This standard is identical to: This publication does not purport to include all the necessary provisions of a contract. This part of the European Standard defines the requirements for equipment for steam boilers and hot water generators as defined in ENwherein steam or hot water will be generated. Water-tube boilers and auxilliary installations – Part 3: Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service.
BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Document Status Indicators The Green document fn indicator indicates that the document is: Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services.
If the shut-off device and the protection device against backflow are not installed in direct connection to each other, pressure relieving shall be possible for the intermediate piping section. A separate expansion vessel or tank shall be used unless the steam space in the hot water generator can be used for expansion purposes. The nozzle or ring height shall not exceed mm, and mm in the case of a tapered design. The inside diameter of the connecting pipework shall be not less than 8 mm.
Amendments issued since publication Amd. The Annex A is normative. Cylindrical glass gauges shall be provided with a safety device for protection against damage by bursting glass.
Requirements for equipment for the boiler. The design of these devices shall permit functional testing, by simulation where appropriate, for all operating conditions. Materials for pressure parts of boilers and accessories. Where duplicate isolating devices are installed in series, but not adjacent 1292-7 each other, the intervening tubework shall be provided with means for venting and condensate removal. Water-tube boilers and auxiliary installations – Part Requirements for flue gas cleaning systems.
A common standby circulating pump can suffice for several once-through hot water generators of one hot water generating plant, if this standby pump is connected to each hot water generator. In addition to this control device a safety device shall be provided to cut off and lock out the heat supply pressure limiter if the maximum allowable pressure is exceeded.
Design and calculation for pressure parts. The een or ring height shall not exceed 65 mm, or 95 mm in the case of a tapered design. First Balkan IT Conference for business platform for standardization Information regarding online access to British Standards via British Standards Online can be found at http: For minimum number of openings see table 4.
Do you use standards in your work? An sn or a visual alarm system shall be tripped if the water level required for operation reaches the specified value. The feedwater pump capacity shall be 0,2 times the steam generated corresponding to the allowable heat output for the generator connected to the system.