Ten safety valve tips to protect employees, facility, profits

Follow these safety valve tips and make sure you are protected.

07/30/2013


When things go wrong, safety valves have only one function—to protect your people, plant and profits. When safety is at stake it’s vital not only to have the best equipment but make sure it is specific and fitted correctly. There is no room for mistakes:

  1. Transport valves upright and never lift them by the easing lever.
  2. Safety valves should always be installed with the bonnet vertically upward.
  3. Always set at least a 5 psig margin between relief pressure and system operating pressure to ensure tight shut off.
  4. Always seal the valve against tampering. Sealing wire and a lead seal are most commonly used.
  5. On steam systems always ensure that no condensate can collect on the upstream side of the valve disc.
  6. Before first lifting an installed valve, always flush the system first. Dirt in the system can damage the valve seat
  7. For steam and gases the discharge pipework should rise, and for liquids it should fall. Rising discharge pipework must be drained.
  8. Repairing, refurbishing and resetting valves must be done only by authorized personnel.
  9. To cut discharge noise use a large diameter discharge pipe or insulate it, but never insulate the safety valve itself.
  10. Regularly use the lifting lever to ensure the valve opens and minimize the risk of corrosion of mating surfaces.

Content provided by Spirax Sarco, originally published in Steam News Magazine.



Anonymous , 08/26/13 09:25 AM:

I´m in doubt if it would be possible to install a heating system around the valve in order to keep it warm for heavy oil system and to avoid problem o high viscosity difficultig flow.
Ryan , TX, United States, 08/26/13 09:35 AM:

About point 3: 5 psig is not a valid rule of thumb and I believe "relief" pressure should say "set" pressure. Safety valves (with the exception of remote sensing pilot operated devices) need to have at least a 10% margin between set pressure and maximum system operating pressure to avoid chattering. The springs have a 10% tolerance which is why relief pressure for most scenarios is treated as set pressure + 10% overpressure (full lift). On the other end of that, you may have the valve begining to unseat and reseat within 10% of set pressure, which may cause chatter if you are operating within that 10% margin. Remote sensing pilot operated valves can have set pressures much closer to operating pressure, depending on the valve. The tolerance range is typically less than 10%.
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
Prescriptive maintenance; Hannover Messe 2017 recap; Reduce welding errors
Safety standards and electrical test instruments; Product of the Year winners; Easy and safe electrical design
Safer human-robot collaboration; 2017 Maintenance Survey; Digital Training; Converting your lighting system
Mobility as the means to offshore innovation; Preventing another Deepwater Horizon; ROVs as subsea robots; SCADA and the radio spectrum
Future of oil and gas projects; Reservoir models; The importance of SCADA to oil and gas
Big Data and bigger solutions; Tablet technologies; SCADA developments
Automation modernization; Predictive analytics enable open connectivity; System integration success; Automation turns home brewer into brew house
Commissioning electrical systems; Designing emergency and standby generator systems; Paralleling switchgear generator systems
Natural gas for tomorrow's fleets; Colleges and universities moving to CHP; Power and steam and frozen foods

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
Featured articles highlight technologies that enable the Industrial Internet of Things, IIoT-related products and strategies to get data more easily to the user.
Compressed air plays a vital role in most manufacturing plants, and availability of compressed air is crucial to a wide variety of operations.
This digital report will explore several aspects of how IIoT will transform manufacturing in the coming years.
Maintenance Manager; California Oils Corp.
Associate, Electrical Engineering; Wood Harbinger
Control Systems Engineer; Robert Bosch Corp.
This course focuses on climate analysis, appropriateness of cooling system selection, and combining cooling systems.
This course will help identify and reveal electrical hazards and identify the solutions to implementing and maintaining a safe work environment.
This course explains how maintaining power and communication systems through emergency power-generation systems is critical.
click me