Thats actually what they have now and because the water is very dirty, they clog up very quickly. From a corrosion standpoint the PFHX works very well. From a heat transfer standby because of the dirty water around NYC it doesnt work very well.
Thank you very much for the quick responses. This is in reference to a commercial office building chiller plant replacement project here in NYC. We will see leaving river water temperatures of about 90F.
There are many such buildings that have these types of cooling systems here in NYC and the...
Good Afternoon,
Im relatively new to heat exchanger piping and vessels that stand up well to salt water service and was hoping someone could provide some guidance on the difference between super duplex stainless steel (2507) vs titanium for piping and heat exchanger tubes.
The pressures are...
Good Morning Everyone,
Sorry to revive this once again, but can you guys advise as to what the current position is for fillet weld qualification range, when it comes to supplementary essential variables for impact testing.
we are working to B31.3, and I was treating the qualification range as...
Weldstan, I would generally tend to agree with you. I guess its just interesting what the code requirements have been and now have been changed.
Also, I have not tried it but I would think austenitic stainless steel is probably the most forgiving cryogenic weld ever. As you said, if you took a...
Thank you, that is very helpful.
So is it correct to state that using the 2019 Edition of Section IX, if you wanted to qualify a procedure that required impact tests, you would be able to use any position?
And it seems like the reasoning for this was that when you weld vertically, you do...
Hello Everyone,
I am looking to gain some understanding of the requirements that recently changed regards to position of which to perform a PQR coupon for a weld procedure that requirements impact testing.
My understanding of Section IX changes is as follows.
- Prior to 2019 code - impact...
Good Afternoon,
We are working with some piping that will be containing Hydrogen at 2400 psi. The piping will be 316 stainless steel. We dont see any clear direction in the code text as to what value to use for Mf for stainless steel. Table IX-5C contains values for low and intermediate alloy...
Good Morning and thank you for the replies.
I should have provided some additional information.
The VFD manufacturer did provide a maximum OCP size, which is typical. The SCCR rating of the drive is much greater than the available fault current. The drive is at the top of a building and the...
Good Morning everyone,
I hope everyone had a nice weekend. I haven't had to do a motor cable specification in quite some time, so just looking to make sure I am not to rusty.
I have a Chiller motor with an FLA of 1045 amps and a MCA of 1306.
Because the MCA is 1306 amps, I will have to...
Good Evening Everyone,
I am embarking upon my first attempt at making welding procedures for cryogenic service piping down to -320F in accordance with b31.3.
I have never done this before and would appreciate some guidance on how to conduct the charpy impact test. The piping to be welded is...
Good Evening,
I am looking to do some very basic calculations that involve making a pressure vessel (24" OD with caps on each end) and want to use Weld O lets for the nozzle connections.
I have reviewed Section VIII div I and cannot seem to track down how to handle these connections...
Greetings everyone,
I recently came across a very interesting problem.
We have a motor with the following characteristics.
- 75 HP TEFC
- 900 RPM
- 460V
- Nameplate amps @ 460V - 111amps, with 1.15 SF
- In. Class - F
- Efficiency - 94.5%
- Power Factor - .68
This motor is paired to a VFD...
Thank you guys very much for the responses. As usual, you guys are an excellent source of information.
I have acquired the electrodes needed (Lincoln Tech-Alloy 606 for the GTAW and Tech-Rod Weld-A for the SMAW work) and the purchased a 1/2" test plate. I will let you guys know how we make...
