Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors
White Papers

8 Steps to Properly Installing a Gasket

By Chett Norton, C.E.T. and Sylvia Flegg, Triangle Fluid Controls




Visually examine and clean flanges, bolts, nuts and washers and make sure to replace any defective components, if necessary.




Lubricate bolt threads, nut threads & facing, and washers.




Install new gasket (Do not reuse old gaskets or use multiple gaskets).




Number the bolts in a “cross pattern” sequence according to this diagram. Important: hand-tighten then pre-tighten bolts to 20 ft/lb torque but do not exceed 20% of target torque.




Check gap uniformity using a gap tool, feely gauge or Vernier calipers.




Target torque round #1 – 30% of target torque, Round #2 – 60% of target torque and round #3 – 100% of target torque. It is very important that you check the flange gap around the circumference in several spots between each of these tightening rounds. If the gap is not reasonably uniform, make the appropriate adjustments by selective bolt tightening before proceeding.




Rotational round: to reach 100% of the target torque, use a rotational clockwise tightening sequence starting with bolt 1 for one complete round and continue until no further nut rotation occurs at 100% of the target torque value for any nut.




Final-round: Re-torque within 4-24 hrs at ambient temperature if possible. Consult TFC technical department for hot-torquing procedures, repeat round 4 followed by a rotational round. A large percentage of short-term preload loss occurs within 24 hours after initial tightening this re-torquing round covers this loss and is especially important for PTFE gaskets.

We recommend the use of an installation assembly worksheet with the details of the assembly and installation including the installers signature and date for verification. You can use the TFC worksheet for easy adoption into your bolting installation verification program. Fill out form below for a pdf of TFC worksheet.

For other specific applications or general procedures, please contact the TFC applications engineer at and you can read more about our Gasket Installation Procedures here.

Please fill out the following form to access this premium content

Privacy Policy:
Empowering Pumps & Equipment is committed to protecting and respecting your privacy, and we’ll only use your personal information to administer your account and to provide the products and services you requested from us and/or our partner. We may also send you our eNewsletter, of which you can unsubscribe and/or customize in your email preferences. By providing your information including email and clicking the button below, I agree to the Terms and Conditions and Privacy Policy, provide my electronic signature, and consent to receive the product/service requested. Consent is not a condition of any purchase. You may opt out any time.