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Hi, Can someone please provide a good go-by or design reference for sizing a detention pond by rational method. its for a small 4 acre development.

Thanks oldestguy

We are working on a industrial site in West Texas. What surface fill is generally used for the entire site for light traffic such as pick up trucks and dump trucks. I was thinking of TxDOT item 247 Grade 1. it has following retained, 7/8"=10-35, 3/8"=30-50, No.4 =45-65, No.40=70-85. Has good mix...

Agree with you azcats. Thank you everyone. That's right HotRod10 :)

Yes, 120mph is ASCE 3sec gust speed

ASCE 7-10 2.4.1 Exceptions 2 - For nonbuilding structures...., it shall be permitted to replace W with 0.9W in combination 7 for design of the foundation. if the projected area is less that 1000 ft^2, we must use W and not 0.6W. isn't it ? Agree with your AASHTO take, but since its inside a...

I agree ASCE 7-10 should be used, .6 is only for buildings, under 2.4 basic combinations exceptions for other structures 1.0 applies for other structures below 1000 ft^2 surface area. Im trying to pick light pole from vendor catalogs and they are based on AASHTO wind speeds and they suggest per...

We are designing a natural gas compressor station using Risk Category of IV per ASCE 7-10, wind speeds for the area is 120 mph. Per ASCE 7-10 wind speeds are 120 mph, but per AASHTO 2013 it is 90 mph. Which wind speeds should I use ?

Thank you SlideRuleEra! P.S: will try to get more info on the difference b/w shipping and operating weight.

hahaa...thing is they are estimating it to be around 20-30% at this time. Have not received a breakdown of loads for the rest (doubt if we receive it at this stage). How much of other operating loads to consider ? or should shipping weight minus skid weight be used for mass ratio ?

yes good part of operating weight is concrete in the skid, oils, panels, etc

Thank you, Will do a detailed analysis per Arya. i have looked at a few go-by's for similar sized compressors and they only have 4 to 5 feet deep foundations. Could not find any calc's on them, doubt if there are any. Wondering what is the industry standard, FEA analysis ? Spreadsheet design...

Jack/ shore it up to compensate deflection, safety during repair and to reload joist effectively, Why not weld 2x2x1/4" angles for the damaged portion of the joist plus 6" longer each side on both sides ?

Hello Everyone, I'm involved in FEED phase of designing foundations for a Recip compressor. Compressor Data: Shipping Weight = 150,000 lbs Operating Weight = 300,000 lbs Dimensions = 44' x 16' For preliminary foundation design, per API 618, Recip compressor foundation to have a mass ratio of 5...