Hose Integrity

To assure that no injury, damage to equipment, or environmental incident occurs as a result of using a defective chemical hose. 

Any hose used to transfer a liquid, including refrigerants, that has an agency-reportable quantity listed for a spill. It does not include normal utility hoses such as steam, water, nitrogen, and air. It does not include hoses that are supplied by a contract carrier. It does not include hydraulic hoses or other such hoses that are permanently mounted as a part of equipment that has its own inspection schedule. Fire hoses are not included, but do have testing procedures for that particular service. NOTE that good judgment should be exercised with the use of all hoses, and any obvious defects should be addressed. 

A visual inspection of the hose must be made before each use for loose or defective fittings, cracking, bulges, ruptures, and contamination in the hose that could result in a problem with the material intended to be moved through the hose. Defects are to be repaired or the hose disposed of to prevent inappropriate use later. 

Braided hoses are to be tested every six months due to the lower reliability. Braiding should also be visually inspected before each use. 

This plant often sees a failure rate approaching about 50% after hoses are in use for a year or more. Many of the failures can be attributed to mechanical damage. It appears that many are victims of motor vehicle traffic. 

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Consider use of higher integrity hose (e.g., metallic braided)... 

Who provides the pump and hoses and are these checked (integrity, compatibility) ... 

The boiler should have been previously drained and all sludge removed with a pressure jet. It should be filled with fresh water, then checked for pressure and vacuum and the integrity of the circulation rig and hoses. 

However, very economical measurement of acceleration is possible when the washing machine is equipped with a high-resolution analog pressure sensor with microprocessor control. These pressure sensors come as a separate part or are integrated directly on to the PCB of the washing machine control. They work as differential pressure sensors and measure the static pressure via a hose in the lower part of the suds container, thus measuring the water level in the suds container (Fig. 5.57). 

Transfer handling conditions can affect mechanical integrity and lead to premature catastrophic hose failure. These potentially damaging conditions include the following ... 

UL 2085 also provides criteria for resistance against vehicle impact, ballistic impact, and fire hose impact. These tanks are also provided with integr secondary containment intended to prevent any leakage from the primary tank from entering the environment. 

SwRI 97-04, Standard for Fire Resistant Tanks, includes tests to evaluate the performance of ASTs under fire and hose stream. This standard is similar to UL 2080 in that the construction is exposed to a 2-h hydrocarbon pool fire of 1093°C (2000°F). However, SwRI 97-04 is concerned only with the integrity of the tank after the 2-h test and not concerned with the temperature inside the tank due to the heat transfer. As a result, UL 142 tanks have been tested to the SwRI standard and passed. Secondary containment with insulation is not necessarily an integral component of the system. 

The bubble point test is a popular single-point physical integrity test for disc filter membranes based on Eq. (21). A fdter medium is wetted with a liquid, and test gas pressure is slowly raised until a steady stream of bubbles appears from a tube or hose attached to the downstream side of the filter and immersed in water (Fig. 9). The pressure at which the bubbles first appear is recorded as the bubble point and is related to the largest pores in the fdter medium. A pore size can be calculated from Eq. (21) however, it must be realized that the bubble point test does not measure the actual pore size, but only allows correla-... 

The 8085 microprocessor sends the coded frequencies and voltages serially up a shielded conductor in the hose-cable to the ship a 1488 integrated circuit is used to drive the cable to standard RS232C signal levels. A similar conductor feeds ASCII control signals from the ship to the UWC where they are received by an RS232C standard 1489A receiver. The con-... 

Weep Test - This is a test to determine the integrity of a high pressure hose. In this procedure (MIL-S-3136, type III and MIL-H-25579) unbraided samples of the tube are pressurized by filling with a specified fuel (70% i-octane + 30% toluene) to a calculated initial pressure. Pressure is incrementally (0.035 MPa) increased until seepage occurs. This pressure is recorded as weep pressure. 

The plasticizer is fed to the mandrel and as soon as it contacts the hose in the viscous-flow state, it forms a layer of colloidal solution, becoming an integral part of the film thickness (Fig. 2.5d). When the colloidal solution separates into phases this layer becomes gel-like. As a result, a film is formed with a structure that is inhomogeneous across its thickness and that has a gradual change from the pore-free polymer layer to that possessing a system of communicating pores filled by a PI (Fig. 2.6b). Cl vapors supplied into the hose dissolve in the plasticizer and the inhibitor thus fills the film pores. 

Filtration is provided by a C2A1 canister attached to the mask by a corrugated hose the canister is housed in a specially designed canister carrier. The M42 integrates with the combat vehicle filtration protection system. The M42 also has a dynamic microphone that integrates with the combat vehicle via a microphone cable.19,20... 

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