Colorado has recently adopted some of the toughest fugitive emissions standards in the country. Operators and maintenance personnel are being challenged to increase maintenance programs, and develop preventive measures to minimize the potential for fugitive emissions. In addition many operators are implementing equipment monitoring plans and systems. Plus, the new rules require existing storage tanks comply with pollution limits that only apply to new tanks under federal law. Challenging to say the least.
Anticipating the new fugitive emission requirements, researchers and product developers within the fluid sealing industry have develop a full line of Low Emission fluid sealing products. These fluid sealing Low Emission technologies are made from improved materials and improved gasket designs. Selecting which product is appropriate for a given application is key. The acronym STAMP—can serve as a general guide to ensure correct gasket selection. The initial S stands for the size of the flanges to be sealed; T stands for temperature; A is for the actual application (flanges, bolts, equipment, etc.); M is for media (liquids, gases, chemicals, water, steam, etc.); and P is for pressure. Once this information is gathered a proper fluid sealing solution can be used.
With the proper fluid sealing solution every flanged joint, valve bonnet, packing gland, threaded fitting can meet or exceed the new fugitive emissions standards.
Gaskets form a mechanical seal which fills the space between two or more mating surfaces, to prevent leakage from or into the joined objects while under compression. The amount of force or torque needed to compress the gasket between two flanges is specified by the gasket manufacturer. When that torque is properly applied a good safe seal is achieved. That is why a good torque wrench is needed.
For more information on the kinds and proper use of torque wrenches click here to read a Fluid Sealing Associations Article on this subject.
This blog post was adopted from Jim Drago, PE, Senior Manager, Marketing Intelligence, Garlock Sealing Technologies, Palmyra, New York, USA article entitled “Initial gasket compression is key to safe, reliable flange joints”
A question that we are often asked is “what pressure rating is the gasket material I need good for?” Obviously, the concern is for the gaskets ability to maintain a good seal and not “blow-out” According to Jim Drago the answer to that questions depends on a number of variables.
Blow-out resistance is not primarily a function of gasket tensile strength, but rather a number of other factors, including clamping force, flange surface texture, temperature, gasket creep resistance, joint rigidity and internal pressure.
1) The clamping force of the bolts transferred through the flanges produces compressive stress (force per unit area) on the surface of the gasket. Different types of gaskets require different minimum compressive stresses in order to effect and maintain a seal.
2) Surface-finish determines how effectively flanges grip a gasket. It is especially important to bear this in mind when dealing with soft, sheet-type gaskets. A serrated flange surface, as specified by ASME B16.5 section 188.8.131.52 will “bite” into a gasket – holding it in place and preventing it from splitting and shearing as it would with a
3) Temperature and gasket creep are directly related. When the temperature increases, flange bolts relax as their yield strength decreases. Gasket materials become thinner without an increase in compressive load. Bolt relaxation and gasket creep effectively reduce the clamping force on a gasket, increasing the probability of a leak.
4) Flange rigidity affects how bolt load will be transferred to a gasket.
5) Internal system pressure develops forces within a joint that concurrently work to pull apart the flanges and push out the gasket.
Finally, In the case of soft-sheet gaskets, compressive stress and not the tensile strength of the material is the major determinant of flanged joint reliability. Therefore, gasket installation demands the utmost diligence. The use of torque wrenches and following gasket manufacturers’ guidelines will go a long way to assuring reliable joints for improved worker safety and plant productivity.
To read the full article, including testing data, go to
High temperature textiles fiberglass tapes provide a safe, durable and effective thermal barrier for a wide variety of applications in the manufacture of metals, petroleum, chemicals, glass, paper and wherever flames and extreme heat can be a danger. Key industries where textiles are used include:
+ Power Generation
+ Natural Gas Processing Plants
(PLAIN OR 9383 HEAT CLEANED)
TYPE: PLAIN OR BOLT HOLE
NOMINAL THICKNESS: 0.125″ (BOLT HOLE TAPE MAY MEASURE DIFFERENTLY)
STANDARD PUT UP: 100FT/RL
STANDARD NOMINAL WIDTHS: .5″, .625″, .75″, 1″, 1.5″, 2″, 2.5″, 3″, 4″, 5″, 6″, 7″
TEMPERATURE RESISTANCE: 1000˚F
STANDARD COLOR: WHITE, OTHER COLORS AVAILABLE PLEASE CALL FOR DETAILS
CONTENT: 100 % FIBERGLASS YARNS
AVAILABLE WITH A HIGH PERFORMANCE PRESSURE SENSITIVE ADHESIVE
• ADHESIVE TEMPERATURE RESISTANCE: 300˚F
• ADHESIVE IS ONLY USED TO AID THE INSTALLATION PROCESS, AFTER THE MATERIAL IS IN PLACE, IT IS USUALLY MECHANICALLY BONDED SO THAT THE ADHESIVE IS NO LONGER NECESSARY.
ALL UNCOATED FIBERGLASS TAPES ARE NONCOMBUSTIBLE MEETING USCG 164.009
OTHER: MATERIAL SHOULD BE TESTED FOR ITS SUITABILITY IN ANY APPLICATION.
USERS SHOULD ALSO FAMILIARIZE THEMSELVES WITH THE MSDS BEFORE
For more information contact Four States Gasket:
In Brighton CO – 303-655-8315
In Farmington NM – 505-325-9806