CoA “ABR Navy Technical Regulations Manual”, Commonwealth of Australia, Director of Technical Regulations – Navy, See ABR Volume 2 Section 5 Chapter 2 Annexes A&B for risk and engineering authority levels. Endorsement indicates that technical risk has been . 1. ASC Engineering Management Plan, and subsidiary processes. 2. Judgement of Significance (ABR). 3. Take 5. Key Behavioral Competencies Required.
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Documents Flashcards Grammar checker. Endorsement indicates that technical risk has been assessed, and that the endorser is satisfied that any risk is being appropriately managed. Releasing officers are to note that they are accepting, on behalf of the Commonwealth, the technical risk associated with the TM Reference A is cancelled and replaced by this Technical Directive. This Directive is based on the following philosophy: ADFLMs have a responsibility to ensure that an appropriate certification plan is put in place to ensure items meet procurement specification.
Therefore items suppled via the ADF supply chain can be assumed to comply with material requirements and the only certification required is evidence that the correct item has been demanded and supplied. There is no need to separately tag and track: Eg illustrations parts breakdowns APL etc Approved planned maintenance takes precedence over the generic instructions provided in this TM The management of flexible hoses in the RAN has necessarily come under increased attention in recent times.
The purpose of this instruction is to provide clear guidance to ship engineering staff on the general requirements for the testing and replacement of flexible piping devices. The basic principle for the management of flexible piping devices is centred on safety and fitness for purpose. Each flexible piping device is to have a traceable path to a quality endorsed manufacturer certifying both its quality and fitness for purpose in the application for which it is intended. This may take the form of a test certificate for an individual device or a quality certificate delivered with a group of devices of which an individual item is a part.
Excluding hyperbaric hoses, there is no specific requirement for each device to have a separate test conducted prior to installation so long as its quality can be assured. Where flexible piping devices, apart from hyperbaric hoses, are delivered as an integral part of an assembly and cannot be separately traced to a test or quality certificate, the quality certificate supplied with the higher assembly together with the manufacturer’s recommended maintenance routines are sufficient for certification purposes.
Testing and Replacement of Flexible Piping Devices
For hyperbaric applications, only approved hoses shall be used. Any non-approved hose in 6942 hyperbaric application must be replaced.
This abd is applicable to abe assemblies — that is hoses fitted with end fittings. The following flowchart gives an overview of the maintenance, testing and replacement procedures and the relationships between this directive and other instructions and specifications 6429 maintenance and OEM requirements.
The definition of the words and phrases used in discussing hoses, end fittings and hose assemblies is as follows: The wearing away by friction. A device for connecting two different mechanical connections or seal system for the passage of liquid or gaseous materials.
The strength of bond between cured rubber surfaces or a cured rubber surface and a non-rubber surface. Changes in physical properties of rubber over a period of time due to long term exposure to heat, sunlight, ozone, moisture, etc. The radius of a bent section of hose measured to the innermost surface of the curved portion. A raised spot on the surface, cover or tube, indicating a separation between the layers usually forming a void or air pocket in the vulcanised article.
A continuous sleeve of interwoven single or multiple strands of yarn, cord or 64992. The strands of reinforcement spiral around the inner hose structure tube in both directions in addition to being interlaced. The pressure at which rupture of the hose occurs. A hose assembly is 6942 to have failed a burst pressure test if there is signs of leakage, rupture, fitting slippage or blow off at a pressure less than the rated burst pressure of the hose.
The strength member of the hose containing fabric, cord or wire reinforcement. The outer rubber layer of a hose assembly.
Protects the reinforcement carcass from abrasion and exposure to harmful chemicals 649 other conditions which can harm the carcass. The criticality is used only to determine the expected service life cycle of rubber flexible hose assemblies iaw Table 1.
The process of vulcanising. Any combination of letters, numbers or symbols used by the manufacturer to identify the period of abbr of a rubber product. Military specifications for hose require the cure date to be expressed as the quarter and year of manufacture. Example; 2Q04, which would represent the second quarter ofor 01 April to 30 June In general, the dash size is the inside diameter of a hose expressed in 16th of an inch.
However, for some hoses it represents the nominal ID and not the true ID. Design pressure – system. The pressure used in the calculation of piping and piping components minimum section thickness.
A fitting connecting two sections of hose to form a 90o hose 6429. A device attached to the ends of a hose to facilitate the connection of a hose Page 5 of 16 assembly to a piping system. The visible portion of hose between two end fittings or between one end fitting and a dogleg elbow which is free to absorb motion xbr operating and shock conditions. A flexible conduit of circular cross section, and usually consisting of an inner element tubereinforcement element carcass and an outer element cover.
A length of hose with an end fitting attached to each end. A dogleg or o return assembly would consist of 2 lengths of hose, 2 end fittings and either a 90o dogleg elbow aabr o U-bend fitting. Hose working pressure — rated. The maximum working pressure for which a hose is designed. Any hose that is used in a life support application involving air, oxygen or mixed breathing gases. The maximum sustained pressure acquired during an impulse cycle. A legible marking, parallel to the longitudinal axis of the hose, which identifies the hose as required by the applicable specification.
Avr life 6942 of a rubber hose contains two separate elements. These elements are shelf life and service life. They do not overlap.
That period of time starting from time of manufacture cure date and generally ending upon installation. That period of time in which a rubber hose is installed and in use. Service life is considered continuous once started and includes intermittent down time. A collection of evidence showing that a product or service complies with a specification or requirement. The evidence may consist of any or all of the following: Record results demonstrating that the work complies with the Maintenance Action examination requirements and Set to Work requirements as applicable.
The specified work having been undertaken satisfactorily as indicated by written reports. Monitoring of Physical Inspection Readings where applicable. Observation that equipment meets performance criteria upon setting to work. A certificate from an accredited quality organisation, certifying the suitability of the hose for its intended use.
The maximum pressure achieved at the beginning of an impulse pressure cycle. Needle holes placed in the cover of a rubber or plastic hose intended for gas service to prevent the formation of blisters.
Testing and Replacement of Flexible Piping Devices
The classification for air pressure categories are as defined at Chapter Page 6 of 16 23 of ABR or reference B, for hyperbaric hoses: Above psig and below psig kPa. A non-destructive pressure applied to a hose or hose assembly to determine reliability under normal working pressure. Normally equal to twice 2x the rated working pressure of the hose. For hyperbaric hoses this is normally 1. A preliminary version of a hose assembly developed for a new application or a change from one type of fitted hose to another type, eg PTFE to rubber, or from fixed piping to hose.
The innermost layer of a hose. A hyperbaric hose meeting the requirements of A ref B. Working pressure – system. The pressure which exists in a system or sub-system when performing its normal function in which a hose or hose assembly may be installed.
A hose shall not have a rated working pressure that is less than the design pressure of the portion of the system in which it is to be installed. Class Maintenance Plan, e. Other authorised specific system instructions. These hose materials do not normally degrade from exposure to atmospheric conditions and they are not subject to any shelf or service life limitations, except where recommended by the manufacturer or as determined by periodic inspections and any subsequent hydrostatic tests or as required in accordance with the appropriate planned maintenance requirements.
Synthetic rubber deteriorates, both in storage 64492 in use, and ultimately becomes unserviceable. Therefore the following shelf and service life is specified so that the optimum life may be obtained from these bar The shelf life for rubber hose, either in bulk form or as a hose assembly, is 66492 years 16 quarters from the date of manufacture, not counting the quarter of manufacture.
For example, a hose manufactured in the second quarter ofdenoted as 2Q04 at repetitive intervals on the agr, has a shelf life that ends on the 30th September The service life is determined by the criticality of the system in which it is installed.
For critical systems the service life is a maximum of 12 years. For non-critical systems it is as determined by condition based monitoring CBM. System criticality shall be as determined at Table 1.
Service life begins from the date of installation for hoses installed between major refits and from a date agreed upon between the sbr authority and the contractor for installation during major refits and construction. This date may mark an event such as system hydrostatic test, date system filled with fluid, system start up, etc.
From the above maximum life of rubber hoses in critical systems is 16 years. Hoses may be issued, installed and remain in service in critical systems provided this period is not exceeded eg, hoses issued 6 years after cure have remaining service life of qbr years. When accepting hoses with shelf life over 4 years ships should consider the cost of condemning the hose for disposal against the reduction in service life.
Water Systems Chilled fresh water Portion where single hose failure results in loss of electronic cooling. There are occasions when a hose assembly may need to be manufactured in lieu of acquisition through DMO. On these occasions, the fabrication of the hose shall be in accordance with a suitably approved standard or procedure.