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:
Contact us about advertising

Re: EFRT Roof Drain Systems

From: Stephen H 
Date: Tuesday, August 09, 2005
Time: 12:00:00 AM
Remote Name:

Comments

How do you calculate the NPS for the drain? Use maximum rainfall rate/hour and design for that flow rate through the piping/hose system. How do you calculate how many drains are necessary? Would be arbitrary, unless your drain size exceeded the size of fittings available. Normally one. I know that the roof must be designed to hold a certain amount of water but what is this amount, API states 10ins in 24 hours but does this assume that no water drains off and that the roof must accommodate 10 ins of water over the entire roof surface? Yes, it is stated that this is with the primary drains inoperative, so it assumes no water drains off. The 10" of water won't actually be distributed over the whole surface, but that quantity of water must be supported. There are essentially three types of systems - flexible hose, pipe & swivel joint and pipe & flexible joint, but has anyone advice on which is best. No opinion. Finally, who is normally held responsible for the Design (and Specification) of the tank roof drain system - the Tank Engineer or the Supplier of the Drain System? If the owner doesn't specify a specific drain system, it would be left up to the tank engineer, who in turn, could delegate it as he sees fit.



Silver Star Sponsors
    Tutorial on Pressure Vessel Safety Awareness        AIS Forensic Testing Laboratory Steel Making Tutorial Industrial Training School | Little Smokey's Bookstore at AIS Engineering Books | ASR Search Engine | Steam and Power Forum
Want to Advertise on the AST Forum
Confidentiality, Disclaimer & Policy
Copyright 2001-2012
All Rights Reserved; AST-FORUM.COM
Valid XHTML 1.0 Transitional