www.heatingandventilating.net
KEEPING VAL N
ew guidelines published by SAFed have been introduced surrounding pressure
key role in maintaining high standards of safety
The new SAFed guidelines were put in place within the workplace.
pressure relief valves in applications that required following an industry increase in the use of
used due to a perceived cost-saving solution by a safety valve. These valves are commonly mis-
The new guidelines will help engineers avoid using pressure relief valves instead.
temperature of valves. It also highlights the risks pressure, discharge capacity of valves and design situations. It focuses on areas such as optimal set the occurrence of dangerous overpressure
valves, a practice which has become increasingly of using pressure relief valves instead of safety
pressure relief valves are used as the last safety In a pressurised system both safety and common in recent years.
LVES SAFed AND SOUN D Consequences
device. However, engineers and specifiers need to be mindful that the requirements can vary
inspection and certification industry, which plays a represents the UK’s independent engineering The Safety Assessment Federation (SAFed) valves along with the differences between them. correct usage for both pressure relief and safety (pictured right) outlines the key points and the Littlewood, sales director at Albion Valves (UK) relief valves and safety valves. Les
Pressure Equipment Directive (PED) 2014/68/EU increasingly valves must now meet the EU’s significantly from system to system, and
to guarantee safety. The key differences:
opens completely. Safety valves should be used set pressure of the valve is reached, the valve Safety Valve – the opening is sudden. When the
lift opening / closing characteristic; higher blow- PED and CE Type Test Approval; normal lift – full Characteristics are: Certified valves with WRAS / for a boiler in a commercial building.
off capacities than pressure relief valves;
opening of the valve is not sudden but gradual if the proportional to increase in the vessel pressure. The A pressure relief valve – the opening is
Pressure relief valves should be used to control the pressure is increased gradually.
approval (without safety function according to PED); Characteristics are: Valve without certification / pressure in a manufacturing process.
proportional opening / closing characteristic; lower blow-off capacities than safety valves.
es
being used. However pressure relief valve both safety valves and In a pressurised sys
tem,
es were nd
valves must meet the EU’s Pr now need to be awar engineers and speci
overpressure protection. specifying the wrong and avoid catastroph Directive (PED) 2014
4/68/EU to guarantee safety e EU’s Pressure Equipment re that fiers r,
g valve when assessing hic risks associated with
file of information about ho declaration of confor instructions with equipment Manufacturers mu poses a huge safety required blow-off at approval is installed appropriate approva mandatory to use saf In applications wh
here PED is applicable, it is ction.
10% would be reached, which d there is no guarantee that the als. If a valve without type test afety valves with the
rmity and maintain a technical uipment, complete a specified ust provide adequate risk.
identification of model and serial number must be marked wit designed and manuf
pressure limits and the CE logo. of manufacture, max
del and serial number, the year h the manufacturer, unique factured. Pressure equipment bout how the equipment was
ximum/minimum allowable the CE logo.
Burning issue
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56