ALL >> Business >> View Article
Dry Gas Seals In Api 682 And Api 617 Standards

Dry gas seals are generally non-contacting, dry-running face seals, mainly used in high speed applications. Natural gas compressors in a gas transfer and distribution network is a common example where dry gas seals are routinely used.
The problem with an ordinary contacting mechanical seal or wet seal is a danger of seal faces overheating at high speed, especially if high speed is combined with high pressure. A common 6500 rpm 70 bar application is very tough for a wet seal to handle. At such high pv factors, a mechanical seal must have certain allowed leakage of the sealed product to prevent overheating and failure. In this case it would be mineral oil at pressure several bars higher than that of the transferred gas as per API 682 flush plan 54. The normally leaking oil is directed back to the oil tank, but not all of it may be collected. Part of the leaked oil will get into the process, that is the transferred gas contaminating it. In some industries it is just loss of oil, easily 1-3 barrels per day. In other industries, contamination with oil involves other cost, for example, contamination of catalyst by a hydrogen ...
... recycle compressor in an oil refinery.
In a dry gas seal normally there is no contact between the faces so overheating, or actually, any frictional heat, does not occur. There is a very small gap that separates the rotary and stationary faces. How does it happen? The rotary face or faces have shallow, often spiral, grooves, which catch gas and under the action of the generated pressure the faces lift one against the other. The buffer gas, usually nitrogen, also gets into the process. Most often it does not create a problem and double seals are used then. If nitrogen is not allowed to get into the process then tandem or triple gas seals are used.
All manufactured dry gas seals are subjected to a dynamic performance test. During the test the seals are running under normal (design) and abnormal conditions, as per API 617 Standard.
Since dry gas seals are used mainly in compressors, they are described in API 617 Standard - a standard for compressors. But because dry gas seals have found some use in pumps as well, they are also described in API 682 Standard, which is a standard for mechanical seals for pumps.
Speaking of use in pumps, dry gas seals or non-contacting seals (or a combination of contacting wet and non-contacting faces) for pumps are still considered a luxury. There certain applications where these seals are desirable. A good example would be sealing a cold (sub-zero) fluid with an inboard wet seal and an outboard non-contacting seal. Nitrogen would prevent icing of the inner parts of the seal and also would eliminate problems associated with arranging a buffer fluid seal system at low temperatures. Still, there are not many applications where dry gas seals are used for sealing pump shaft while sealing centrifugal compressor shafts with dry gas seals has become an industry standard.
Find more information relating to mechanical seals, and API 682 here.
Add Comment
Business Articles
1. Why Bergercpafirst Stands Out Among Cpa Firms In New Jersey, Manhattan, And NycAuthor: bergerCPAFirst
2. Restoring Functionality: The Importance Of Local Expert Upvc And Aluminium Door And Window Repair
Author: Vikram kumar
3. How Custom Printing & Packaging Helps Mumbai Businesses Build Stronger Brand Identity
Author: Walid Shaikh
4. Role Of Marble Ganesh Murti In Festivals And Rituals
Author: Madhav Arts
5. 2025 Trends: Heavy-duty Paper Bowls Shaping The Dessert Industry
Author: Gujarat Shopee
6. How To Join Shade Cloth Together: Your Easy Guide
Author: DIY Shade Sails
7. Top 7 Benefits Of Asterisk Development For Modern Businesses
Author: Jack Morris
8. Experience The Wellness Benefits Of A Sauna In Kelowna
Author: Duke John
9. Reputable Pintle Bush Distributor In Dubai Uae For Marine Use
Author: Anbu Thalapathy
10. Trustworthy Stern Tube Bearing Manufacturer In Dubai Uae For Marine Sector
Author: Anbu Thalapathy
11. From Pigment To Perfection: Koel Colours In Colour Cosmetics Manufacturing
Author: Kanika shah
12. Top Benefits Of Lithium Batteries For Caravans And Travel Trailers
Author: trailercamper
13. Real-time Competitive Price Tracking : Boost Revenue By 18%
Author: Actowiz Metrics
14. Iso 42001 Vs Iso 27001 Certification
Author: Sqccertification
15. Best Office Cleaning Suppliers In Dubai – Facilico Facilities Management
Author: Facilico