High pressure hoses

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High pressure hoses

Full name *

The name of company *

1. Which hoses are covered by this standard?

1 point

a) Sleeves for use in hydraulic systems for road construction machinery, hydraulic equipment, and metallurgical plants.

b) Sleeves for use in temperate climates only.

c) Sleeves for use in cold climates only.

d) Sleeves for use in tropical climates only.

2. What types of temporary hoses are mentioned in the text?

1 point

a) Steam hoses - used to transport steam.

b) Air hoses - used to transport compressed air at different pressures or other gaseous substances.

c) Other technical hoses - used for pumping, transferring and transporting fine bulk materials, etc.

d) Vacuum and pressure hoses - used for pumping, transferring and transporting water, liquid chemicals and fine bulk materials without solid parts.

3. What group of hoses exist based on the breaking force of the material used?

1 point

a) Sleeves with coupling nut and spherical nipple

b) Sleeves with metal braids

c) Sleeves with elbow nipple and cutting ring

d) Sleeves with metal coils

4. How many types of sleeves are there depending on construction and purpose?

1 point

a) 53

b) 50

c) 15

d) 40

5. What types of connections for pressure hoses are mentioned in the text?

1 point

a) Flange connection - bolts are tightened on flange connections and hose couplings.

b) Threaded connection - the ends to be connected are the same size or a matching adapter/coupling.

c) There are also eccentric clamp couplings, 1/4 turn couplings, "storz" quick release couplings and some other types of quick release couplings, etc.

d) All options are correct

6. Requirements for safety devices and fasteners:

1 point

a) All connections shall be equipped with safety devices. All outgoing lines shall be secured with fasteners suitable for the specific working conditions (e.g.: wire guards, safety ropes, hose clamps).

b) The use of homemade or self-repaired devices is not permitted.

c) Ratings - may not always be directly marked on the equipment, but maximum pressure ratings, hose size and operating conditions should be noted on the manufacturer's original packaging.

d) All options are correct

7. What margin of safety should hoses have as required? *

1 point

a) Twice the safety margin

b) Three times safety margin

c) Four times safety margin

d) Five times safety margin

8. At what temperature should thermo-wrapped hoses be operable?

1 point

a) From minus 60°C to 125°C

b) From minus 60° C to 250° C

c) From minus 60° C to 500° C

d) From minus 60° C to 700° C.

9. What is the requirement for the sealing surfaces of the nipples?

1 point

a) Shall be clean, without traces of corrosion and cracks

b) Shall be electroplated

c) Shall be lubricated with industrial oil before assembly

d) Must be marked in state and Russian languages.

10. What materials and semi-finished goods are used to manufacture the hoses?

1 point

a) Reinforced hoses, hydraulic fittings, universal crimp couplings

b) Rubber seals, hydraulic flanges, nipples

c) Metal braids, hydraulic fittings, hydraulic flanges

d) Unreinforced hoses, hydraulic fittings, hydraulic flanges, hydraulic nipples, nuts

11. What markings should the hoses have?

1 point

a) Labels should contain manufacturer's name or trademark, hose type, inside diameter, working pressure and proof of conformity.

b) Labels should only contain the hose type and inside diameter.

c) Marking shall only contain working pressure and month of manufacture.

d) No marking is required.

12. What should be avoided when installing hoses?

1 point

a) Bending with a radius of less than 30 mm

b) Assembling in a bent position when the hose is twisted

c) Tightening packing nuts if there is pressure in the hoses

d) All of the above.

13. What inspection methods are used for hoses?

1 point

a) Visual inspection, measuring the diameter, checking the thread, measuring the weight of the rubber layer

b) Visual inspection, tightness test, length measurement, loading parameters check

c) Strength test, inside diameter measurement, fatigue test

d) Weight inspection, outer dimension check, check for internal rubber layer

14. Which test is performed to verify the tightness of hoses?

1 point

a) Strength test

b) Dynamic fatigue strength test

c) Tightness test with static hydraulic pressure

d) Measurement of hose weight changes due to exposure to oil

15. What is the warranty period for storage of hoses?

1 point

a) 6 months

b) 12 months

c) 24 months

d) No warranty shelf life

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