Recent developments in API standards now allow the distinction between Double Block and Bleed and Double Isolation and Bleed valves. Check out this interview and transcript with Fred Turco from Omni Valve, at Valve World.
Wednesday 3 July 2013
Tuesday 2 July 2013
Chevron packing for severe service valves in demanding petrochemical applications
Chevron packing is a valuable resource for industrial valves owing to its
specific features like durability, high elasticity, tough resistive power and
above all the ability to withstand high/low pressures.
Crane’s Xomox Tufline severe service valves, for example, use
Chevron packing, particularly in valves designed for alkylation service. These particular valves are made of carbon steel or monel body and monel trim which are required to withstand the
corrosive nature of hydrofluoric acid
(HF acid). Given the highly corrosive nature of HF acid service, alkylation
valves require reliable packing making Chevron
packing a reliable choice.
 |
| Xomox Tufline sleeved plug valve. Source: cranecpe.com |
Designing the seal
The Chevron packing seal
consists of a base ring, V-ring and a pressure ring. All three rings are come
together to form a seal that reacts to the pressure changes. The base ring is
made of a cotton fabric mixed with nitrile rubber that ensures complete safety
from the extrusion problems. This ring is then backed up by the V-rings which
are also made from the cotton fabric as well as the nitrile elastomers,
combined as per industry standards. The overall purpose of the packing is to
increase the sealing efficiency and balance the load which is crucial for better
performance. The third and last element of the packing are the pressure rings
whose function is to distribute the pressure equally among the rings and
protect its different, integral elements from disproportionate wear and tear.
Usually one base rings is combined with one or three V-rings
followed by one pressure ring. The Chevron seals find their use in industrial
applications as well as other robust and high-alloy
valves.
Benefits of using Chevron seals
There are several advantages of using Chevron seals in monel valves or other packing
solutions:
- It has the ability to adjust to a broad range of
demanding industrial applications.
- Durability and lasting performance reduces down-time,
cost-of-ownership and increases worker safety.
- Despite wear and tear, the Chevron sealing and packing
system will work well without adversely affecting performance.
- Flexible to bear even the severe temperature and pressure
conditions.
Use
Chevron packing can be found in many different types of
valves, but are of particular use in corrosion
resistant valves designed for
alkylation service and made of monel. Other industrial purposes of such seals
include pumps, marine hydraulics, and injection molding machines.
Friday 28 June 2013
Tuesday 16 April 2013
Sunday 24 March 2013
Monel valves in petrochemical applications and... trumpets?
Monel valves in petrochemical and trumpets?
Did you know that the main two end uses of monel valves are world apart? One of the main uses of valves made of monel is in the petrochemical industry. Monel valves are particularly useful in oxygen service, as well as marine service in combination with aluminium bronze. This corrosion resistant alloy is of particular use in alkylation processes where hydrofluoric acid eats through most metals, bar monel and hastelloy.Monel valves are also used in.... trumpets! Monel valves don't require being oiled frequently since oil evaporates faster on stainless steel compared to monel. The drawback: price!
Saturday 23 March 2013
Titanium valves: the link between the petrochemical and motorsports industries
Did you know that titanium valves are used both in petrochemical applications as well as in motorsports and aviation? Valves made of titanium are ideal for certain acid applications in petrochemical processes; titanium is inert in some acid environments and the use of titanium valves ensures that the material doesn't react to the medium flowing through the valve.
Weight is not an issue in the petrochemical industry, though titanium valves tend to weigh around half the weight of their stainless steel counterparts. Weight, on the other hand, is a key issue in both motorsports as well as aviaion, though reaction to acid content isn't a concern here. Titanium is great for motorsports, since less weight means more flexibility for manufacturers. This, too, is true in aviation, with an added bonus: titanium has a very high tensile strength compared to stainless steels, and it also very brittle. Fissures are therefore easier to detect before they become a serious problem.
 |
| Valve made of titanium for nitric acid application |
Wednesday 20 March 2013
Valves in duplex alloy
Valves made of duplex alloy are taken front and center stage at desalination plants. We've noted a particular upswing in orders from Central and South-America, particularly in the development of new desalination plants and processes.
We welcome this development and continue to serve our customers in this booming market!
 |
Valve made of duplex alloy; swing check configuration. |
Monday 18 March 2013
Valves in Alloy 20 for corrosive petrochemical media
Valves in Alloy 20 for corrosive acid processes
The use of valves made of Alloy 20, such as A351 CN7M or B462 N08020, has shot up over the past few years. New applications have been found for Alloy 20 - sometimes identified as Carpenter 20 - which has proven relatively inert against high concentrations of nitric acid up to 60ºC, as well as heated though diluted oxide. Alloy 20 valves can also be used in acetic acid alkali and diluted hydrochloric acid; they are also found in hydrofluoric acid applications (HF acid) at alkylation plants.
 |
| Alloy 20 gate valves from The Alloy Valve Stockist (Barcelona) |
The Alloy Valve Stockist, headquartered in Barcelona, Spain, is constantly expanding its inventory of Alloy 20 valves to include a wide range of gate, globe, check, ball and butterfly valves. Plug valves are also available in Alloy 20 material.
Wednesday 13 March 2013
Barça moves on to Champions League quarter finals after subduing Milan
What a spectacular game last night, and a priviledge to watch together with friends and industry colleagues!
Last night, Barça came back from a 2-goal away-field disadvantage to clinch a solid 4-0 homegame victory over Milan. The two teams were playing the second leg of the final-sixteen-team Champions League.
Game was mesmerising!
Last night, Barça came back from a 2-goal away-field disadvantage to clinch a solid 4-0 homegame victory over Milan. The two teams were playing the second leg of the final-sixteen-team Champions League.
Game was mesmerising!
Wednesday 27 February 2013
Substantial valve order on its way!
Just closed a substantial order for some metal-seated titanium ball valves for South American plant. Delivery is tight: 7 weeks; it will be done!
Thursday 21 February 2013
HF Acid Valves for corrosive alkylation service
HF acid valves designed for alkylation service at plantes designed according to UOP and ConocoPhilips licenses are one of the most corrosion-resistant category of valves available on the market.
Only a handful of manufacturers have been approved by UOP and ConocoPhillips for use under their license. End users are obliged to use hf acid valves made by these manufacturers alone, and otherwise risk to loose the licensor's guarantees for the safety of the plant and the integrity of the alkylation process.
Although alkylation valves are made of relatively common steel -- they either come in carbon steel body and monel trim, or monel body and trim -- they also come with a series of safety and performance features that are unique to these valves. For the time being, only gate, globe, check and plug valves are approved for UOP and ConocoPhillips alkylation plants.
Other materials used at alkylation plants often follow NACE norm 5A-171 "Materials for Storing and Handling Commercial Grades of Aqueous Hyrofluoric Acid and Anhydrous Hydrogen Fluoride". This norm os one of the most demanding ones in the process industry.
Source: www.craneenergy.com
Only a handful of manufacturers have been approved by UOP and ConocoPhillips for use under their license. End users are obliged to use hf acid valves made by these manufacturers alone, and otherwise risk to loose the licensor's guarantees for the safety of the plant and the integrity of the alkylation process.
Although alkylation valves are made of relatively common steel -- they either come in carbon steel body and monel trim, or monel body and trim -- they also come with a series of safety and performance features that are unique to these valves. For the time being, only gate, globe, check and plug valves are approved for UOP and ConocoPhillips alkylation plants.
Other materials used at alkylation plants often follow NACE norm 5A-171 "Materials for Storing and Handling Commercial Grades of Aqueous Hyrofluoric Acid and Anhydrous Hydrogen Fluoride". This norm os one of the most demanding ones in the process industry.
Source: www.craneenergy.com
Wednesday 20 February 2013
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