The turbine casing completely surrounds the rotor and provides the inlet and exhaust passages for the steam. the casings of turbine cylinders are of simple construction to minimize any distortion due to temperature changes. casings are usually split horizontally to permit easier access for inspection and repair. the flanges are accurately machined to ensure a steam-tight metal-to-metal fit, and the flanges are strongly bolted together. flange seals, except for corrective maintenance measures, are not normally used. in some (high temperature) units, both top and bottom casing halves are made of two vertical casings bolted together and seal-welded. the inlet end is made of alloy steel (cr-ni), while the exhaust end is made of carbon steel. the flanges in the casing are bolted together. one method of joining the top and bottom halves of the cylinder casing is by using flanges with machined holes. bolts or studs are insertion into these machined holes to hold the top and bottom halves together. to prevent leakage from the joint between the top flange and the bottom flange the joint faces are accurately machined. another method of joining the top and bottom cylinder flanges is by clamps bolted radially around the outer of the cylinder.
T Agent : It depends: if you like (2-hot) weather, you can go there in summer, but of you prefer (3-mild) weather, I advise you to visit Spain in early spring or late autumn.
Mr G : Isn't the weather (4-changable) in autumn? I hear that one day can be sunny and another day can be (5)
T Agent: Not quite so. October is a very pleasant month in Spain with a (6-typical) temperature of about 18-20. Though it can be (7-frosty) in the morning so you have to be careful if you are going to drive. I don't think there will be any rainstorms or (8-hurricanes).
Mr G : I hope not. So I won't need to take my (9-raincoat) and umbrella.
T Agent: Definitely not. I'm sure you'll have a (10-nice) time in Spain.
2. By the time Jenny .. (gets) to the theatre, the play .. (will have already/started).
3. Frank .. (was driving) to work when, all of a sudden, a tree branch .. (came) crashing down on the road.
4. Before his accident, Peter ... (had been skiing) for 5 years.
5. Yesterday, I ... (was walking) home from work when it ... (started) to rain.
6. Ben ... (had won) the race, so he felt thrilled.
7. Kyle ... (had been working) in that restaurant for six years before he ... (quited)
8. While I ... (was praparing) dinner, the phone ...(rang).