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All new hose assemblies should be tested prior to use to determine if they have been damaged in storage or shipment. When anhydrous ammonia hose is subjected to ordinary use it should be tested every 90 days for the first year and once a month thereafter. Hose subjected to severe usage-for example, dragged over sharp rock surfaces, sharply bent in storage or continually exposed to weather-will deteriorate more rapidly than carefully handled hose. The hose should be visually inspected each day either before or after the day's use. Hose assemblies should also be tested immediately after the hose is subjected to abnormal abuse such as: severe end pull, flattening or crushing by vehicles or sharp kinking when cold. Any hose that has been recoupled should be proof-tested and inspected before being placed in service. All physical testing should be performed with the hose at room temperature. An inspection card should be maintained which describes each hose, the manufacturer, date received, purchase order number, date of installation and the results of physical tests and visual examinations. Test ProceduresLay out the full length of the hose in a clean and preferably dry area. Inspect the outside cover of the hose for blistering, excessive abrasion or cuts and coupling slippage. This inspection will be made when the hose is not under pressure. 1. Cuts in hose cover which expose or damage the reinforcement are cause for replacement. Small cuts, nicks or gouges in the cover which do not go completely through the cover will not be cause for replacement. Hose strength is controlled by the plies of reinforcement, |
and for this reason, damage in this area cannot be tolerated.
2. Damage to the textile or wire braid is cause for hose replacement. 3. Blistering or loose outer cover is cause for hose replacement. 4. Examine couplings for slippage. Slippage is evidenced by the misalignment of the hose and coupling and/or the scored or exposed area where slippage has occurred. Any evidence of slippage is cause for hose replacement or recoupling and retesting. After visual inspection, connect the hose which has met these standards to a test pump capable of producing 700 psi. Where bolt clamp type fittings are used, the clamps should be tightened before proof-testing. Fit the opposite end with a quick opening valve. Be sure all connections are tight and then introduce water into the hose through the pump. At the same time, elevate the outlet end with the outlet valve open to bleed off air. When all the air has been expelled, close valve and proceed with the test. Place hose in a straight line and raise the pressure to 200% of working pressure recommended by the hose manufacturer. Contact with Anhydrous Ammonia will burn skin, and is especially damaging to the eyes and lungs. This is true for its liquid and gaseous (vapor) state. Examine the hose for leaks, especially near the couplings. Also look for any noticeable bulging or swollen areas. Any hose with leaks or bulging spots should be replaced or the affected area cut out ant the hose recoupled. The hose should have been held at pressure for a minimum of five minutes. |
Dayco strongly recommends use of anhydrous ammonia hose assemblies produced by a certified Dayco coupler using Dayco hose, permanent couplings and assembly testing equipment and procedures. Dayco strongly recommends replacing entire assemblies rather than attempting to repair or recouple assemblies.
Anhydrous ammonia is extremely volatile and poisonous in both liquid and gaseous states. Improper hose application or failure to fully test and inspect the hose may lead to life-threatening situations-poisonous gas leakages, fires or explosions. DO NOT USE ANHYDROUS AMMONIA HOSE FOR LP GAS APPLICATIONS! DO NOT USE LP GAS HOSE FOR ANHYDROUS AMMONIA APPLICATIONS!
Wrapped Finish HoseDayco's anhydrous ammonia hose features a continuous extruded cover with a unique wrapped finish. This cover provides excellent coupling retention, flexibility and significant abrasion resistance. In addition, since this hose is manufactured with an extruded cover, many of the delamination problems experienced by other hose manufacturers are eliminated. Color Coded StripesDayco vulcanizes brightly colored product identification stripes into the hose for quick hose construction identification. The silver stripe identifies series 7261...reinforced with a stainless steel braid. This hose is ideally suited for bulk transfer or heavy duty applications. The green stripe identifies series 7262...reinforced with multiple nylon textile braids. This hose provides the flexibility required for farm or field applications. Integrated SystemDayco is the only manufacturer of hose, couplings and crimping equipment to offer a completely integrated anhydrous ammonia hose assembly system. This one manufacturer concept |
assures quality assemblies because the components are designed ... manufactured ... and assembled for critical anhydrous ammonia applications.
Coupler CertificationDayco's Certified Coupler Program authorizes and trains an elite corps of distributors to supply 100% tested and certified hose assemblies. These select distributors must pass stringent Dayco audits to qualify as a Certified Coupler. This program includes:
Guarantee ProgramDayco's pro-rated credit program guarantees for 6 years from date of assembly against defects in materials and workmanship when anhydrous ammonia assemblies are produced by Dayco or a certified Dayco anhydrous ammonia coupler using Dayco specified hose, couplings and crimping equipment set to Dayco specification. |