I am purchasing a Diesel Storage Tank designed to ULC S601-07. This ULC specification provides the required thickness of the tank by tank size, no thickness calculations are required. A corrosion allowance was specified for the tank, however ULC does not seem to address corrosion allowance...
I am investigating the requirements of relocating a tank. The tank is small enough that it will not have to be dismantled to be relocated.
The tank service will change, however the tank was designed for a larger specific gravity and design pressure. Inspection of the tank has been carried...
There appears to be a discrepancy in the design wind pressure for API 650 tanks.
-Section 5.2.1 defines the wind pressure on vertical surfaces to be 0.86(V/190)^2 or 18(V/120)^2 which is used in the wind overturning (Section 5.11) and Appendix F calculations.
-When calculating the stiffener...
I am looking at the decision tree (Fig F-1) in Appendix F of API 650. The tank internal pressure is less than the weight of the shell & roof, however when I calculate Pmax it is less than the design pressure. F.4.2 indicates not to exceed Pmax. What needs to be done, I assume that anchoring...
I have an air receiver (DP = 1034 kpa) for which the bottom head and 1/3 of shell requires internal epoxy coating. Per the client specification, the nozzle neck, flange and first third of the flange face also require coating. The flange face coating detail indicates that a reduced coating...
Can someone please describe or provide references as to how to calculate the relieving capacity of open vents. I have calculated the required relieving rates using API 2000, however need to confirm if the gooseneck vents (open to atmosphere) have sufficient relieving capacity.
Thanks.
I have read through NFPA 11 which provides information to design a foam system for storage tanks (ie. number of nozzles, flow rates etc.). What is the criteria used to originally determine if a foam system is required or not. Are there guidelines based on the combustibility and volume of the...
I am trying to caculate the allowable external pressure on a cone section of a vessel using Code Case 2286-2. Section 4.1.1 provides methods for calculating De and Lce to substitute for Do and L in section 3.1 to determine Fha and Pa. My questions are:
1) What thickness shall be used to...
I have a few questions regarding API 650 Section P. Any assitance is appreciated.
1) Section P.1 indicates that the appendix shall be used for tanks greater than 36m diameter and tanks less than 36m diameter only when specified by the purchaser. Are there any issues with using the appendix...
When calculating Mf (moment about the shell to bottom joint from liquid) in section 5.11.2 of API 650, wl is the lesser of 0.9HD or 59*tb*(Fby*H)^.5. 0.9HD is significantly less than the other value and appears to have different units. Can anyone explain?
Thanks
Can some one please advise me as to how tb (required thickness of the bottom plate under shell that is used to resist wind overturning) is calculated in API 650 section 5.11.2.
Thanks
Line 9 on the standard API 650 datasheet in Appendix L gives the option to "Check buckling in the Corroded Condition". I would have thought this to be a manditory calculation. Why is it an option?
Thanks
What is the reason for capping the tank diameter at 6m (20ft) in API 650 Appendix J? If the transportation envelope is such that it permits a larger diameter tank to be shop fabricated is this acceptable?
Tank Information
Diameter = 60m
Internal Design Pressure = 1.62kPa
Roof = Supported Cone
Roof Slope = 9º
The client is requesting that the tank roof be frangible. The tank meets the frangibility requirements per 5.10.2.6, with maybe the exception of the compression ring type.
The Appendix F.5.1...
I have two questions.
1) I am looking for some information on hillside tank bottoms (ie sloping across the diameter of the tank). Can anyone provide some information with respect to the topics below.
a) What are some guidelines as to the largest practical tank diameter that can have a...
I have a 10" opening in a 32" flat cover (with hub) and want to cofirm the cover thickess is adequate. I have tried two methods yeilding quite different resuts.
1) Finding the required cover thickness per UG-34 and the required reinforcement per UG-39.
2) Analyze the cover and opening as an...
I have a vessel with an MDMT of -10ºF and the requirement of integrally reinforced nozzles. The nozzles being provided are a variety of forged nozzles (LWN, HB, F and V series).
UCS 66(c)(4) provides criteria for exemption of LWN's if the MDMT is no colder than -20ºF. Is there any exemption...
