Frequently Asked Questions
Does Garlock have dielectric breakdown values for gaskets?
Which gaskets work for steam and superheated steam?
What are controlled density gaskets?
Controlled Density™ is a manufacturing process used in the production of Garlock Spiral Wound gaskets to ensure optimum filler density across the windings to achieve consistent compression and superior sealability. Garlock Controlled Density gaskets are able to achieve tightness at lower loads. While most gaskets (manufacturers other than Garlock) are manufactured to a “Y” factor of 10,000 psi, gaskets manufactured with Controlled Density are manufactured to a “Y” factor of 7,500 psi. This contributes to an improved performance during stress cycling. Garlock also manufactures Controlled Density Plus™ (CD Plus) gaskets which offer a “Y” factor of 5,000 psi.
Does Garlock have gaskets that meet 3A?
Does Garlock have installation instructions?
Garlock strongly recommends the use of calibrated torque wrenches to tighten bolts to the correct load. We have a installation procedures and directions are available upon request.
Does Garlock recommend the use of torques wrenches to tighten flange bolts?
We realize many end users resist using a torque wrench for installation. However, we have found the use of a torque wrench to be the least painful way to gain a substantial increase in performance. Any method which accurately controls the compressive load on the gasket is acceptable.
Does the use of heat traced lines affect a gasketed joint?
Heat traced lines pumping materials which are solid at ambient temperature can present a number of problems for gaskets.
Has Garlock tested gaskets against any fuel additives?
The chemical MTBE (methyl t-butyl ether) has become a very common fuel additive and gasketing compatibility inquiries on this material are frequent. Garlock in-house testing has shown GYLON® gasketing to be unaffected by MTBE. We have also found compressed sheet Styles 9850 and 3000 to be suitable for MTBE service. These materials are recommended for MTBE alone or mixed with gasoline.
How does available compressive stress affect gasket performance?
Compressive stress must be appropriate to the gasket type...
How do I fill a large gap in flanges? Can I stack gaskets? (Spacers in Flanges)
Some installations require a very thick gasket to fill a large gap between flanges. We do not recommend stacking numerous gaskets in the same flange. In-house tests have shown that a better way to fill a 1/2" gap, for example, is to install a 1/16" gasket on each side of a 3/8" thick incompressible spacer ring. Ideally, the spacer ring will be consistent with piping metallurgy, serrated, and cut to the same dimensions as the gasket. We recommend higher minimum torques when using this arrangement.
How do I get my gaskets to pass bubble tests?
Some end users perform bubble tests of their system to check gasket tightness. This information is helpful before specifying a gasket. Bubble tests are an extremely tough test for a gasketed joint, and may not be an appropriate means to verify correct installation. Lightweight flanges with low available compressive load may never achieve "bubble tight" results.
How do I obtain leachable levels (chemical) for gaskets?
Some pipe specifications call out maximum levels of "leachables" for gaskets. These limits are usually concerned with leachable chlorides, fluorides, halogens and sulfur. These ions, or charged particles, are of concern due to their tendency to promote corrosion of piping systems. Garlock keeps test results for numerous gasket styles on file and we will test and certify leachable chlorides, etc., where required. There is a charge for these tests. Due to the nature of this type of analysis, we publish "typical" leachables only on certain styles such as our nuclear grade Style 9920.
- Does Garlock have dielectric breakdown values for gaskets?
- Does Garlock recommend the use of torques wrenches to tighten flange bolts?
- Does the use of heat traced lines affect a gasketed joint?
- Has Garlock tested gaskets against any fuel additives?
- How does available compressive stress affect gasket performance?
- How do I fill a large gap in flanges? Can I stack gaskets? (Spacers in Flanges)
- How do I get my gaskets to pass bubble tests?
- How do I obtain leachable levels (chemical) for gaskets?
- How is a gasket selection affected by the flange type?
- How much will my gasket compress?
- What is ABS?
- What are the appropriate gaskets for Jet Fuels?
- Why do customers request gaskets that are electrically insulating?
- Which gaskets work in flange isolation kits?
- Which gaskets meet USP (United States Pharmacopeia) requirements?
- Which gaskets have passed a fire test?
- Which gaskets can I use for FDA or USDA applications?
- Which gaskets are recommended for Refrigerants?
- Which gaskets are best for Cryogenic Service?
- What are the best gaskets for monomers?
- What is controlled density? What are controlled density gaskets?
- What are gasket constants?
- What is the correct flange surface finish?
- What is the crush strength of Garlock gaskets?
- What does it mean if I am given the pH of the solution?
- What do I need to be concerned with when gaskets are installed in grooves or recesses?
- What is a full face gasket?
- What is Garlock's position on the reuse of gaskets?
- What gaskets are recommended for chlorine service?
- What gaskets are recommended for oxygen (O2) service?
- What gaskets can be used with aviation gasoline?
- What gaskets can I use for steam? What is superheated steam?
- What gaskets can I use for strong oxidizers?
- Which gaskets are ABS type approved?
- Where can I find "M" and "Y" values for flange design?
- Where are the values for Thermal Conductivity?
- Which thickness is best for a gasket?
- What gaskets are recommended for Gasohol?
- What's the best way to control Emissions from gasketed joints?
- What is a modulus of elasticity for gasket material?
- What gasket problems can be caused by pressure spikes?
- What is the recommended shelf life for gaskets?
- Does Garlock have any gaskets approved for military specifications?
- Does Garlock have any gaskets that are approved to NSF/ANSI 61 standard for drinking water?
- Does Garlock have data on Radiation Resistance?
- Which gaskets work for steam and superheated steam?
- What are controlled density gaskets?
- Does Garlock have gaskets that meet 3A?
- Does Garlock have installation instructions?