GEA Grasso Screw Compressor Product Animation

Carrier 23XRV Water-Cooled Screw Chiller

How to buy train tickets in China?

Traveling in China is actually pretty convenient, for long distance travel you can take flight, for medium and short distance travel you can use bullet train. Our bullet train can run over 300km/h, it's like riding in a Lamborghini with top speed with more convenient seats and no need to worry about traffic. Today we shall talk about how to buy train tickets in China.

Usually Chinese citizens buy train tickets on www.12306.cn, very convenient, can buy through their mobile phone website, this tickets service is provided by Chinese government, but it don't provide English service. Each Chinese account can add 5 foreign passport information, so you can ask your China friends or suppliers to buy tickets for you. This passport information cannot be deleted freely, there's time limit, I haven't been able to know the rules but the other day I was trying to delete some old passport information and add some new passport to buy tickets for new customer, the system says no. You can also check how many tickets left available on this website, but still no English.

If you want to buy train tickets by yourself online via English, you can use www.ctrip.com, it's a travelling assistance company that provide services including buying train & flight tickets, booking hotels, etc. On this website you can buy train tickets with your passport information and pay via credit card, all in English, service phone also available in English.

Tips:

If you want to buy train tickets online, make sure you complete payment before 11 pm, otherwise the server will be closed, till 7 a.m next morning you are not able to buy tickets.

After you buy the train tickets online, how do you get tickets? For a foreign traveler you can not print out tickets on self-service machine. There are 2 ways: go to the train station ticket office counter or go to a tickets agency office in the city. For most province capital cities and giant cities like Beijing Shanghai, Guangzhou, ShenZhen, etc, I don't suggest you to go to train station ticket office counter, because there usually will be at least 20 people waiting in front of you, spending 1 hour or more to get the tickets is very often. When you plan your schedule, make sure you have at least 1 hour for waiting in the line to get the ticket. Also, there're a lot of tickets agency office in the city, but to get there you need to search it online(in Chinese), explain to cab driver where you want to go, go through city traffic and pay 5 CNY(around 1 dallor) fee. These agency offices usually open 8 a.m. and close 5 p.m., so make sure you can get there in time. 

If you come to visit my factory, you can leave all troubles to me, I can help you buy train tickets, book hotel, and pick you up from airport or train station. (Limited by budget, we only provide eating, we do not undertake your hotel charge and extra cost)

I'm Mike, a sales from Jinan Ourfuture Refrigeration Equipment, if you need refrigerating units for cold storage and IQF or if you have troubles traveling in China, feel free to call me +86-18678897804 or send email to mike@refrigerationcompressorunit.com

Night of Ourfuture Refrigeration with leader from Frascold and Refcomp.

Owner of Ourfuture Refrigeration mr. Eric Shao is having dinner together with COO Frascold shanghai mr. Ivan Casali and Operation Manager mr. Enrico Faccio. Welcome to China! Welcome come to "Night of Ourfuture Refrigeration"

Fiji customer vising our factory and cold storage projects

Some new compressor rack photos from factory

What could happen if liquid refrigerant goes into compressor?

Thank Ed Keuper from GEA Consulting.

Ideally, any liquid entering the compressor suction will be rich enough in oil and lean enough in refrigerant that lubrication will be satisfactory. Yet, if any liquid ingested into a compressor has too low a concentration of oil, lubrication may be compromised and wear leading to compressor failure can ensue. All compressors are vulnerable to lackof-lubrication failure, either from lack of oil or from too much refrigerant in the oil.

A second type of failure is the result of injecting too much liquid refrigerant/oil into a compressor that can damage or destroy the compressor by “liquid slugging”. Screw and scroll compressors are rather more tolerant of liquid in the suction stream than are reciprocating compressors. This is due to the differing nature of the compression processes.

In a reciprocating compressor designed for a three to one compression ratio, the gas may reach the discharge pressure when the piston is only at half stroke. At this point the discharge valve opens and gas is discharged as the piston continues to rise even though gas pressure in the cylinder no longer rises. The final clearance volume may be only one tenth of the total swept volume. This clearance volume is not discharged, but is re-expanded on the suction stroke. One might say at this point that the true compression ratio is ten to one considering a closed discharge valve (swept volume divided by swept volume plus clearance volume). If a volume of liquid of 110% of clearance volume is in the cylinder when compression begins, the piston will be compressing only liquid at the end of its stroke and the liquid may not be able to exit the discharge valve fast enough to avoid developing a very high pressure in the cylinder. This high pressure can cause failure of the connecting rod or failure of the head bolts. For a reciprocating compressor to be efficient, a small clearance volume is required. Yet, it is the small clearance volume that makes reciprocating compressors susceptible to liquid slugging damage. Allowable levels of liquid in the suction are determined by the ratio of clearance volume to swept volume.

In contrast, screw and scroll compressors designed for a three to one compression ratio capture a volume of suction gas (and some oil and maybe some liquid refrigerant) and reduce its volume to one third its original value. But the compression process is completed before the discharge port opens. Any liquid in the suction stream will cause the compression ratio to rise above the design value of three, but the rise is slower than in the reciprocating compressor. For example, assume that the suction stream for a screw compressor consists of 1 part liquid and 8 parts gas by volume. The compressor will reduce these 9 parts to 3 parts. At the completion of compression, one part will still be liquid and two parts will be gas. The pressure in the compressor when the discharge port opens will be four times suction pressure (8 parts gas going in divided by 2 parts gas going out). The one part of liquid remains one part because the liquid is essentially incompressible. Thus, the effect of liquid in the suction stream is to increase true compression ratio. But a four to one true compression ratio in a compressor designed for three to one is probably safe to operate. Allowable levels of liquid in the suction stream are determined by the design pressure ratio and the maximum pressure that can be tolerated in the compression chamber.