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Wall Mounted Vessel
July 27th, 2010 | 
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Safety valve - Mud Clarifier - Diaphragm Wall Equipment
Function and design
Proportional-Safety Valve
The earliest and simplest safety valve on the steam digester in 1679 used a weight to hold the pressure of the steam, (this design is still commonly used on pressure cookers); however, these were easily tampered with or accidentally released. On the Stockton and Darlington Railway, the safety valve tended to go off when the engine hit a bump in the track. A valve less sensitive to sudden accelerations used a spring to contain the steam pressure, but these (based on Salter spring balances) could still be screwed down to increase the pressure beyond design limits. This dangerous practice was sometimes used to marginally increase performance of a steam engine. In 1856 John Ramsbottom invented a tamper-proof spring safety valve which became universal on railways.
Safety valves also evolved to protect equipment such as pressure vessels (fired or not) and heat exchangers. The term safety valve should be limited to compressible fluid application (gas, vapor, steam).
The two general types of protection encountered in industry are thermal protection and flow protection.
For liquid-packed vessels, thermal relief valves are generally characterized by the relatively small size of the valve necessary to provide protection from excess pressure caused by thermal expansion. In this case a small valve is adequate because most liquids are nearly incompressible, and so a relatively small amount of fluid discharged through the relief valve will produce a substantial reduction in pressure.
Flow protection is characterized by safety valves that are considerably larger than those mounted in thermal protection. They are generally sized for use in situations where significant quantities of gas or high volumes of liquid must be quickly discharged in order to protect the integrity of the vessel or pipeline. This protection can alternatively be achieved by installing a High Integrity Pressure Protection System (HIPPS). Technical terms
A steam locomotive boiler safety valve belonging to 60163 Tornado
In the petroleum refining, petrochemical and chemical manufacturing, natural gas processing and power generation industries, the term safety valve is associated with the terms pressure relief valve (PRV), pressure safety valve (PSV) and relief valve. The generic term is Pressure relief valve (PRV) or Pressure safety valve (PSV)
Relief valve (RV): automatic system that is actuated by static pressure in a liquid-filled vessel. It specifically opens proportionally with increasing pressure.
Safety valve (SV): automatic system that relieves the static pressure on a gas. It usually opens completely, accompanied by a popping sound.
Safety relief valve (SRV): automatic system that relieves by static pressure on both gas and liquid.
Pilot-operated safety relief valve (POSRV): automatic system that relieves by remote command from a pilot on which the static pressure (from equipment to protect) is connected.
Low pressure safety valve (LPSV): automatic system that relieves static pressure on a gas. Used when difference between vessel pressure and the ambient atmospheric pressure is small.
Vacuum pressure safety valve (VPSV): automatic system that relieves static pressure on a gas. Used when the pressure difference between the vessel pressure and the ambient pressure is small, negative and near the atmospheric pressure.
Low and vacuum pressure safety valve (LVPSV): automatic system that relieves static pressure on a gas. The pressure is small, negative or positive and near the atmospheric pressure.
RV, SV and SRV are spring operated (even said spring loaded). LPSV and VPSV are spring operated or weight loaded. Legal and code requirements in industry
In most countries, industries are legally required to protect pressure vessels and other equipment by using relief valves. Also in most countries, equipment design codes such as those provided by the ASME, API and other organizations like ISO (ISO 4126) must be complied with and those codes include design standards for relief valves.
The main standards, laws or directives are: United States
ASME (American Society of Mechanical Engineers) Boiler & Pressure Vessel Code, Section I
ASME (American Society of Mechanical Engineers) Boiler & Pressure Vessel Code, Section VIII, Division 1
API (American Petroleum Institute) Recommended Practice 520 and API Standard 526, API Standard 2000 (low pressure -Storage tank) European Union
European standard steam boiler safety valve
ISO 4126 (harmonized with European Union directives) EN 764-7 (former CEN standard, harmonized with European Union directives, replaced with EN ISO 4126-1)
AD Merkblatt (German)
PED 97/23/EC (Pressure Equipment Directive - European Union) Japan
JIS: Japanese Industrial Standards South Korea
KOSHA Water heaters
Temperature and Pressure safety valve on a water heater.
They are required on water heaters, where they prevent disaster in certain configurations in the event a thermostat should fail. There are still occasional, spectacular failures of older water heaters that lack this equipment. Houses can be levelled by the force of the blast. Pressure cookers
Pressure cookers are pots for cooking with a pressure proof lid. Cooking at pressure allows the temperature to rise above the boiling point of water (100 degrees Celsius at sea level ) which speeds up the cooking and makes the cooking more thorough.
Pressure cookers usually have two safety valves. One is a hole upon which a weight sits. The other is a sealed rubber grommet which is ejected in a controlled explosion if the first valve gets blocked.
The term safety valve is also used metaphorically. See also
Boiler explosion
Flow limiter
Relief valve
Pilot-operated relief valve
Safety shutoff valve
Valve
Ball valve
Butterfly valve
Control valve
Globe valve
Needle valve References
^ List of countries accepting the ASME Boiler & Pressure Vessel Code
^ API 5210-1, Sizing and Selection of Pressure-Relieving Devices
^ EN ISO 4126-1 Safety devices for protection against excessive pressure - Part 1: Safety valves (ISO 4126-1:2004)
^ Elaine Porterfield, Paul Shukovsky, and Lewis Kamb (Saturday, July 28, 2001). Four hurt as water heater explodes. seatlepi.nwsource.com, Retrieved on Saturday, May 12, 2007
Wikimedia Commons has media related to: Steam boiler safety valves Categories: Valves | Safety equipment | Locomotive partsHidden categories: Articles needing additional references from May 2007 | All articles needing additional references
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