We have compiled a list of the Top 10 Most Common, or Frequently Asked Questons among investigating customers. This page of questions and answers resonates these questions. However, if you are looking for more indepth or detailed answers to other common questions you can find these in the archive of User’s Workshops. See Customer Care for access to this information.
Top 10 Most Frequently Asked Questions
What are the start-up spares needed for the Unheading system?
What is the life expectancy of the Unheading system?
How fast is the Unheading and Reheading of the system?
How long does it take from "order to ship" an Unheading system?
What is the typical steam consumption of the Unheading system?
How much does it cost?
How long does it take to install a unit?
Where do you have other Unheading systems installed?
What does the Unheading system weigh?
Can we use our current cutting tool with your Unheading system?
Top 10 Most Frequent Responses
What are the start-up spares needed for the Unheading system?
30 in Bottom Unheading Spares.xls
36 in Bottom Unheading Spares.xls
56 in Bottom Unheading Spares.xls
60 in Bottom Unheading Spares.xls
What is the life expectancy of the Unheading system?
The DeltaGuard is the only unheading device in the world that is able to boast that it is built, tested, and proven to operate day in and day out continually, and reliably, from turnaround to turnaround. Officially, the general benchmarks are: Body & Bonnets = 20 years; seats, rings, and gates = 5-7 years. In fact, DeltaGuards from different coker plants have been pulled during it's "scheduled" turnaround maintenance and was found to be in perfect working order. DeltaValve does recommend replacing the seals and rings during turnarounds as a preventative maintenance solution.
How fast is the Unheading and Reheading of the system?
Because the DeltaGuard Top and Bottom Unheading devices are pnuematically, or hydraulically, controlled by a remote operator, it is not subject to how fast a team of engineers can untorque the bolts and swing the massive gate out of the way, then when finished reassemble it. This unique relovutionary tools saves thousands of dollars in time, alone, because 1) it only needs the supervision of one operator or engineer. 2) it only takes any where from 2 to 4 minutes to stroke the valve. The average time is 3 minutes.
How long does it take from "order to ship" an Unheading system?
Lead times (from production to delivery) vary with every project due to the differing complexities of the plants requests. The 'A-typical' project will generally take 48-52 weeks upon receipt of approved drawings and documentation.
What is the typical steam consumption of the Unheading system?
60" bottom switch steam is 2000-6000 lbs/hr, normal 200-800 lbs/hr; 30-36" top valve switch steam 300-720, normal 100-188 lbs/hr.
How much does it cost?
Costs may vary with each project and plant. These variances are due to any special requests, added complexities, drawing modifications, and other deviances from the "off-the-shelf" product. To get a better understanding of costs that may be associated with your particular coker, please contact our sales department.
How long does it take to install a unit?
Because every coker unit is laid out differently it's difficult to lay out a blanket turn-over plan. Prior to your refinery's turn-over DeltaValve's engineers will be onsite to confer with managers, engineers, and other key staff to determine the best course of action for installing the new DeltaGuard®. Over the years each install has taken between 2-4 weeks/valve depending on crew availablity, site limitations, etc. This represents average conditions.
Where do you have other Unheading systems installed?
For a current list of installations visit installations.
What does the Unheading system weigh?
The bottom unheading DeltaGuard weighs approximately 72,000 lbs excluding the transition spool. It's closer to 90,000 lbs with the transition spool afixed. Though the Top Unheading DeltaGuard is significantly smaller it still weighs upwards of 12,000 lbs. Because of the significant amount of weight we use specialized truck drivers and longer trailer beds to offset the weight. Cranes and team work are used to hoist and position the unheading device in place.
Can we use our current cutting tool with your Unheading system?
DeltaGuard® unheading devices were developed with other cutting tools in mind. There have been no reported problems using current cutting systems with the DeltaGuard.
Currently, DeltaValve has developed its own cutting tool which hopes to prove superior to any currently installed cutting tool. The DeltaValve Auto-Switch Cutting Tool has been re-engineered over several testing phases. It is engineered to work seemlessly with its own Top Unheading Device (DV815/820) though it will work with other 3rd party unheading devices. It has successfully cut and cycled through multiple coker drums while still in its beta testing phase. Look for this new revolutionary cutting tool during the first part of 2008. For more information on the DeltaValve Auto-Switch Cutting Tool click here.
