|New Articles Available
The More You
Know: Process Safety Information (PSI)
From our guest author, Mike McCue, read about what's
important when conducting a Process Hazard Analysis. Read the full article.
Flow Through Orifice Plates in Compressible Fluid Services at High Pressure Drops
calculation of compressible flow through orifice plates at high dP (critical flow) appears
to be carried out incorrectly in most instances. This flow condition is often encountered
on gas plants....Read the full
Explosion in a Salt Bath of a
Synthetic Fiber Plant
Synthetic fiber plants like Nylon and
Polyester use a salt bath consisting of a mixture of sodium nitrate and sodium nitrite for
cleaning metering pumps, spinnerette assemblies, valves, and fittings coming in
contact with polymer melts....Read the full
Affecting the Quality of Quicklime
To conserve natural resources and comply with responsible care
initiatives, the soda ash industry has concentrated on optimal and effective utilization
of lime in the ammonia recovery section of the soda ash process....Read the full article.
Samudra Manthan - Mining the World's
Salt affects our lives and our needs more than anything else. In industry,
salts are important raw materials for heavy chemical industries that require high
quantities of salt with fewer impurities, like calcium magnesium.... Read the full article.
Pyrophoric Iron Fires - UPDATED
Read the lesson submitted by one of our visitors in this quick update to a
popular article on our site. Read the update here.
|New Software Titles Released
|Pressure Venting of Dust Explosions (VDI Edition)
Calculate the pressure venting
requirements for dust explosions based on VDI 3673, Part 1, November 2002. This a German
technical document which is used to govern such requirements in many areas outside of the
Flammable Mixtures - Flash/LFL/UFL
Two calculations are included with this title:
1. Estimate the flash point of a flammable and inert material via Raoult's Law.
2. Determine Lower and Upper Flammability Limits of a flammable mixture via Le
EZZE TRIZ is essentially cook book
problem solving with a recipe, which follows the procedures discovered by Altshuller to
find an innovative solution to a particular problem.
|Vent Requirements for Steam Cleaning Vessels
Over the years,
we've seen far too many innocent vessels fall victim to a lack of sufficient venting when
steam cleaning was being performed. Are you sure that your vessels have the
appropriate amount of venting capacity? Condensing steam can create a powerful
vacuum that can damage your vessel beyond repair. Before steam cleaning your vessels
again, check your venting requirements with our easy to use software tool entitled "Various Relieving Scenario Calculations". This spreadsheet
includes the following relieving scenarios:
Steam condensing on tank surfaces
Cold water spray - steam condensing
Vacuum hazards from drainout and pumpout
Tank venting for gas and liquid inflows
A truly flexible software title and it can help in many
circumstances. There's also a preview available here.
|Overheard in the Online Forum
"We have safety valves on a initiator
feed vessel which are blanketed with nitrogen. They are designed for a fire case,
control valve failure, and overfilling.
The initiators are peroxides solutions with heptane and they are susceptible to
decomposition. The valve flow rate is 18000 kg for the fire case, 780 kg for
nitrogen failure and much less for overfilling. The set pressure for the valve is 5
This means that a pressure relief valve can also act as a thermal relief valve which in
the case here is overfilling.
What does the fire flow rate mean? Does it mean that the valve, when fully open,
must be capable of relieving 18000 kg/hr in the event of a fire outside the vessel and
heat from the fire increasing the pressure in the vessel?"
Read the replies to this message
Looking for another great engineering website?
Consulting engineer Paul Ostand has provided many great articles on tank blanketing
Also, check out www.ktron.com/cutcosts to learn
more about optimizing your recipe blending procedures.
|Launch of Enterprise Asset Management Section
|Mr. Mike Sondalini joins us
as a guest author in his new column entitled "Enterprise Asset
Management". Read his latest column "What is the Purpose of Equipment Maintenance?"
Calculate the torque required to tighten UN inch size bolts such as piping flange bolts to
a required level of tension without breaking them. See how much or how little of the
torque actually goes into achieving tension in the bolt. See the Mohrs Circle and Ductile
Failure Envelope conditions both during tightening and after installation. See the effect
of various lubricants and bolt surface finishes. Set up to work with UNC, UN8 and UNF inch
size bolts to ASTM A193 and A320 bolt materials but with the ability to deal with other
thread types and materials. All of the formulas used are provided in the worksheet and the
calculation is presented in both US and SI units.
The interface is extremely user-friendly and can be previewed here.
When you're ready to get your copy of the Bolt
Torque Calculator, you can purchase
from the online store and download the software immediately.
|CE Credit Discounts
|Did you know that you can get a 10% discount
on a variety of online CE courses offered by RedVector.com? Visit the CE Credit section of our online store for instructions.
Remember, don't put the course in your "basket", use the link provided with each
course description to order from RedVector.com.
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