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The ASME BPVC Section III NB-3500 requires a fatigue analysis for valves greater than 4NPS and basically sends you to B16.34 for valves 4NPS and less to do a minimum wall calculation. Why/what was the reasoning for making 4NPS the cutoff?

The purchaser must communicate in the purchase order what edition of the code to use.

thread731-160778 Any one have new data on the amount of a pay raise for obtaining a PE? Thanks, bumpjones

Yes the subject of lockwasher performance has been covered many times in this forum. I reviewed the FAQ section and understand that the predominant opinion is that lockwashers don't help. I was asking if any one knew of any studies that supported this positon. It helps to have supporting data...

Does any one know of any engineering studies performed to determine what if any affect the use of lock washers has on the integerity of s structural joint?

I am working on a report for a class 3 valve and in reviewing B16.34 Section 6.1.2 to determine the minimum wall thickness required found the following, "the inside diameter d is taken as the minimum diameter of the flow passage but not less than 90% of the basic inside diameter at the valve...

I work in a large specialty machine shop and we are constantly moving equipment. I want to use buss drop but the safety department requires conduit. The safety department can't tell me where the regulation to use conduit comes from but I know the NEC allows buss drop. I think that the conduit...

Hello, we currently have a room we call the cleanroom in which we assemble valves for O2 service. Recently the room was flooded when someone left the DI Water supply valve open. Now the flooring is comming up and there is no way I can believe that the room meets specs for a 'clean room'. Does...

Be yourself if you have to 'phony up' for the interview then chances are you won't like the job if you get it.

GO FOR IT!!! Just be carefull that the job responsibilites in your new position and carefully spelled out and it is understood that you will no longer be availible to perform your old job tasks. Also ensure the additional compensation promised or implied is documented. I didn't do that when I...

Yes Factory Mutual requires them based on the tower liability.

Mostly the cost to repair these machines, the ways are not replacable. We are currently rearranging the plant to align the equipment to value stream manufacturing. And moving these machines causes a lot of problems to surface.

The old timers at the plant where I work tell me that it is possible to "twist" the frame of a Gisholt 5L lathe to compensate for way wear. I believe that the concrete pressure cone will fail and pull out before enough force can be exerted on the frame to straighten it. We are using 3/4"...

We currently install buss heads on to our I Line buss duct with the duct energized. With the current awareness of 'arc flash' hazards should we deenergize the entire buss or continue with our current practice. Thanks, Bumpjones

We are looking to design a high pressure hydro room. Can anyone provide us some guidance on the how to determine the required wall thickness of this room. Some of our hydros are in the 20,000psig range. We want to build a wall to separate us from the object being hydroed during the...

We do a lot of hydrostatic testing of our product and have been tasked to build a "high pressure hydro room". Does anyone know of any standards or codes that we can look to for guidance? How do I differentiate between a "hydro room" and a "high pressure hydro...

Hello, We put in two new cooling towers last year and we operated the cooling towers in tandem. When one chiller is running we run one condenser water pump and allow the condenser water to run over both towers. During operation of a single chiller we operate our towers at 1/2 of rated flow...

Are there any 'thumb rules' for when a machine needs to have a pad and when it doesn't? We are moving a machine and the suggestion has been made to fasten it to a 2" steel slab that is 9'x15'. This doesn't seem effective to me and I am worried that the machine will walk across the shop...

I am trying to determine a method to analyze trusses when they are subjected to a load that is not at a panel point. We have trusses that are 60' long and have panel points every 7.5'. The problem comes to light when we try to install hoists in our assembly and machining areas. The hoists are...

Hello, We are rearranging our manufacturing are and need to move several CNC machines and lathes. Where can I find quidance on when to pour a pad for a machine and when do not need a pad. Thanks, Bumpjones