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Max/Nor/Min tells more than just Cv. It also dictates the valve characteristic (linear, equal%, or other proprietary characteristic) required for proper control. In most application, this is intended to linearise the overall control as far as possible.

Kingss. Not sure if you're referring to noise as audible noise, or acoustic induce vibration (AIV). 3dBa/50D pipelength are applied for AIV mitigation. Noise reduction is usually through trim designs or/and insulation.

Well, thanks for all. It's nice to have a mixed reaction from everyone.. some agree and some don't to the proposal. At least it's worth the discussion. tkdhwkd: Correct that you pointed out coolers are installed on all compressors. However, most installation requires manual regulating of the...

Try SHELL DEP. I remember something on this in their flare and venting system design section. If I'm not mistaken it's 500 litres of liquid volume and includes the considerations as Guidoo suggested.

I'm postulating a scenario actually. Assuming it's a product compressor which delivers to the B.L. Due to circumstances, the upstream unit prior to the compressor has to be blocked in momentarily for a few minutes or at most an hour. I was thinking that in case that the compressor can be run...

It's a general question. Anyone with experience operating a compressor (recips or centrifugal machines) on full recycle when the inlet to the compressor is blocked? What are the pros and cons, and also the things that we have to take note of? Thanks in advance.

Samiran, Correct me if I'm wrong. You've been having prob with the discharge side of the compressor ONLY? Blocked dischage can occur anywhere along the fluid transport line. And that includes the lines prior, leading to the compressors. In those instances, there's no credit of anti-surge...

I'm not trying to debutt, but your reason for client wanting to continue to use HYSYS is not quite justifiable. What if HYSYS hasn't created the extension? What if the client do not have the extension himself? I trust you must be one from the consultant company, and whatever results you...

Why HYSYS? This is first principal.

Sizing of two phase flow lines has to be such that the following is met: 1. Pressure drop is acceptable. 2. Flow regime should be in the stable phase, avoid slug flow where possible. Generally, this is related to velocity, the higher the velocity, the better you can avoid slug flow. Check the...

Dear all, Much has been said about the API's 2/3 rule (or the new 10/13 rule) for heat exchangers. And the discussion always resolves around high pressure and low pressure side. But which sides are we talking about? What's the likelihood, or credibility to consider tube rupture relief, when...

I find your interpretation on point 2 rather acceptable. But also check the following: a. Whether it's 150degC or 350degC, the piping would very well be below 150# rating, if it's a LP flare. b. Maybe at the higher design temperature, your vessel thickness would still be lower than the min...

I think it's not such a bad idea after all to have a 10% margin. It may well cushion future upgrade, if any. Check the rated capacity of the PSV you select, it may also already have the 10% you required.

Be careful of software bugs. It's typical when upgrading from one version to another. To check, I suggest, simulate using a lower version, then open the same simulation at a higher version. Results should be quite the same if not similar. If problem persist... contact ASPEN Tech, let them crack...

Interesting.. fqureshi. Almost similar situation as mine. But I don't quite understand what u meant by "drip pot and U seal". Mind providing me a sketch? Send to aikmeam@hotmail.com Thanks.

Montemayor, a great piece of advice I must say. Your comments on reworking the flare system is what I had in mind as well. But rather than modifying the whole flare system, I was thinking of adding a knock out pot at the outlet of each bursting disk for removal of the CW before sending the...

I've got a concern with a current design work I'm doing now which I hope to hear some opinions. There are many water cooled heat exchangers in my work, in which the low pressure side (cooling water) pipings are not designed according to API 10/13 rule. And since the high pressure side can be...

Thanks. So, simply means that in my case: PSV1 set at 54 barg with accumulated overpressure not exceeding 55.62 barg. PSV2 set at 55.62 barg with accumulated overpressure not exceeding 57.29 barg. Is that correct?

Can anyone advise me on the allowable overpressure for PSVs installed on Boilers (say operating at 54 barg), and which reference is that taken from? I recall a 3% figure at the back of my head but not quite sure of the reference.

I've just designed 2 BFW pumps, one running and one on standby, both with auto recirculation valve installed. Besides serving for minimum pump protection, is there a possibility that these ARC valves come with a bypass orifice to keep the spare (idle) pump warm as well? If yes, who are the...