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In New Zealand, are LNG/NG classified as Hazardous Substances? Is NG Class 2.1.1A? Is LNG Class 3.1A?

JLSeagull, Thanks. SI 1982/1357 "Notification of Installation Handling Hazardous Substances Regulations 1982" has not been posted on OPSI. But I have downloaded from my friend through UK law library, which pre-registration is required.

JLSeagull, Thanks. To start my research, I need SI 1982/1357 "Notification of Installation Handling Hazardous Substances Regulations 1982"

Hi, all, I am looking for the threshold quantity requirement of hazardous substances. Please see whether you have ideas on the following for UK requirements: 1. It appears that SI 1982/1357 "Notification of Installation Handling Hazardous Substances Regulations 1982" has not been posted on...

quark, David, rmw, crjones, jay165, Montemayor, Thanks. Based on your posts, it can be concluded that the key factors for deciding the type of compressos are price and ambient temperature. Since the air compressors will be installed in the tropical region, water-cooled is therefore better than...

I am now selecting the Air Compressor for a new power station. The expected capacity of Air Compressor is around 7 bar and 50m3/min. The Air Compressor (two-stage) will be screw type with intercooler and aftercooler. We require the water-cooled Air Compressor but the Bidder counterproposed...

I found there are three different arrangement for the Deaerator in a Combined Cycle Power Plant: 1. Deaerating Condenser - Deaerating process is carried out inside Condenser. 2. Low Pressure Drum Deaerator - Deaerating process is carried out insde the LP drum. 3. Separate Deaerator -...

Referring to the thread below, http://www.eng-tips.com/viewthread.cfm?SQID=81007&SPID=794&newpid=794&page=1 My project has new delevopment. We will focus on the following measures to reduce particulate emission from a coal fired power plant:- 1. Retrofit an additional cell upstream of EP...

Thanks to all valuable advice. Having taking a bit more study, I want to summary below: Target of my task: To reduce the dust emission to ambient, or to reduce gas temperature from around 145 degC to 125 degC so as to increase EP efficiency. Plant: 20-year 250MW coal fired boiler with...

Thanks to Heula, dew point is really a concern. Other than the wet scrubber, any other equipment available in the market.

The second solution should be "cool outlet gas" instead of "heat it up". For the questions raised by yogibear1, I will address later. To davefitz, do you have any idea to cool down outlet gas? and why restoring the air heater performance is the best solution? Thanks

As our coal-fired boiler has operated for 20 years, the air heater efficiency drops, the gas temperature leaving the air heater has increased by around 15 degC. This deteriorates performace of Electrostatic Precipitator downstread of air heater. Two possible solutions:- 1. Restore air heater...

davefitz: Thanks I agree Items a-c. Item d: According to my knowledge, all HP, IP and LP economizer feedwater control valves are located at outlet of economizers. Why such arrangement can reduce cyclic fatigue? I agree Items e & f Item g: Do you refer to vertical HRSG ? Item h: In ASME...

thanks to everyone giving your valuable advice. The HRSG I specified is triple pressure with reheat. The HP steam temperature and hot reheat temperature are around 566degC. So I think it is appropriated to specify the T91 for final superheater and reheater. Regarding vertical or horizontal...

To athomas236 Thanks your advice let me clarify the suitation I face. I am writing a specification for a combined cycle plant. According to suppliers' preliminary documents, our required power output may not be achieved without a supplemenary fired HRSG. So some of suppliers have...

John You have water washing experience? Can you share with us?

Hi, anybody can tell key points to specify the supplementary firing equipments for a HRSG. The HRSG can be a vertical or horizontal type. The supplementary firing is limited to duct firing. The location can be at HRSG inlet duct or between first and second tube blocks counting from the gas...

Hi Isthill Pressure: 110kg/cm2(HP) 40kg/cm2(IP) 10kg/cm2(LP) Temperature: 540C(HP), 560C(IP/Reheat), 200C(LP) Are they sufficient?

Questions on triple pressure with reheat HRSG:- 1. The material of HRSG superheater and reheater are usually T22. If change to T91, the thickness of the tube can be reduced. I think this can help to reduce the cycle fatigue. Is it correct? 2. For vertical HRSG, all headers are outside the...

My company has two vertical HRSG with internal insulation. We are going to carry out the water washing. According to the supplier's recommendation, we need to add alkali chemical into the washing water to neutralize the acidic deposit on the HRSG tube surface. The we need to use another...