Earl and the Aboveground Storage Tank Forum for fuel tanks, plastic tanks, fuel oil storage tanksWelcome to the aboveground storage tank forum, a bulletin board dedicated to tanks, fuel tanks, plastic tanks, fuel storage tanks, and above ground storage tanks (AST) API650, API653 & UL142 aboveground storage tanks (AST) and chemical plastic tanks. Remember the forum is made up of volunteers from experts to beginners. Unfortunately, we cannot allow free commercialism that promotes products, services, or sites.
Sponsored by:
Spirax SarcoPE Marketing, LLC
Contact us about advertising

MJCronin on The difference between the API 650 & API 620

By: MJCronin 
Date: Friday, January 30, 2004
Time: 12:00:00 AM

Banu, My two cents worth, There is a USA regulation (NFPA-20 I think) that addresses the design of these tanks as well as underground fire mains. As I can best recall, Either API-650 or AWWA D100 can be used to design these tanks The major differences between the API 650 and API 620 rules are as follows: - For tanks with flat bottoms and operating pressures less than 2.5 psig, API-650 is commonly used as the design code. Tanks of 12"-6" diameter and smaller are commonly shop fabricated, - Tanks that have operating pressures between 2.5 and 15 psig or tanks in refrigerated service use API-620 as the design code Just my thoughts...... MJC

Published on ast-forum.com

Spirax Sarco

Spirax Sarco: A World Leader in Steam Management

An Energy Engineering Company Specializing in Steam Energy Solutions.  Steam generation from HRSG to Process Heating, Spirax Sarco has your energy solution.


  • Instrumentation and Controls Systems
  • Experts in Steam & Condensate
  • Training Courses
  • Capital Equipment: Condensate Packages and Systems
  • Steam Trap Programs Facility Wide
  • Steam Process Heating Optimization
  • Distributors Worldwide


Invite us to talk to you about your steam consumption today and what we can do for you!


Spirax Sarco

Spirax SarcoPE Marketing, LLC
Want to Advertise on the AST Forum
Confidentiality, Disclaimer & Policy
© 2001 to Aboveground Storage Tank - AST Forum, All Rights Reserved.
Valid XHTML 1.0 Transitional