• Introduction:
BV blow down vessels are designed and manufactured fully in accordance with the latest version of PD 5500, inspected during design and manufacture by an inde - pendent insurance company and supplied complete with a data dossier. they also comply fully with the european pressure equipment directive 97/23/EC (SI 1999/2001) and are CE marked .
• Background information:
When a steam boiler evaporates water the dissolved minerals in the remaining boiler water are concen-trated. To prevent the concentration becoming exces-sive and causing damage to the boiler some of the wa-ter is “blown down” from the boiler periodically and re-placed with fresh water. The blow down water loses pressure rapidly, resulting in the evolution of flash
steam. This mixture of steam and hot water is a po-tential hazard. It is not permissible to drain water to public sewers above 43oC so the blow down water must be safely contained and allowed to cool first. The BV blow down vessel is designed to do this.
• Regulation:
Boiler blow down installations must comply with the pressure systems and transportable gas containers regulations 1989 (“Pressure systems Regulations”) (HMSO). Recommendations on design of boiler instal-lations are given in BS 806 and PM 60 (available from BSI and hmso respectively). following these recom-mendations will satisfy most of the requirements of the Pressure systems Regulations. GMS blow down vessels comply with BS 806 and PM60. also, the hse guidance Note PM5 (available from HMSO) states various requirements for the sys-tem design. blow down vessels must have a minimum design pressure of 7 barg or 25% of boiler pressure,whichever is greater. GMS blow down vessels have a standard design pres-sure 7 barg - higher on request.
• Ancillaries supplied as standard:
Vent head-stainless steel, screwed or flanged cooling system-direct acting valve & sensor inlet manifolds (Three off) - supplied complete with isolation & check valves.
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