Can Micro Test Hose be coiled for storage?

Coiling represents an acceptable and commonly‑adopted storage method for Micro Test Hose in warehouses and on‑site locations. However, strict operational requirements must be followed during coiled storage. Improper coiling generates permanent structural damage, which subsequently leads to inaccurate pressure measurement, medium leakage and premature pipeline failure after re‑commissioning. Quite a number of early failures of Micro Test Hose originate not from field operation but from improper coiled storage, a factor easily overlooked by practitioners.
Featuring thin tube walls and embedded high‑strength braided reinforcement layers, Micro Test Hose undergoes continuous bending stress once coiled. If the inner coiling dimension is too small, the hose sustains persistent high bending stress. Prolonged static stress produces permanent indentations and creases on the inner liner. Such deformation cannot be fully eliminated even when the hose is fully uncoiled and straightened. After system pressurization, stress concentrates on creased positions, readily giving rise to cracking and permeation. Pressure transmission is disturbed, gauge readings become unstable, and measured data lose practical reference value.
Controlling the inner coiling diameter constitutes the primary principle for coiled storage. The circular inner diameter of coils must exceed the product‑specified minimum bending radius. Do not form overly tight small‑diameter coils merely to save storage space. Perform coiling gently with slight gaps between adjacent loops instead of heavy compression between stacked layers. Special attention shall be paid to binding procedures. Many operators fasten coiled hoses firmly with cable ties. Sustained squeezing from ties creates local indentations on tube walls and damages internal braided fibers, forming latent failure risks. Binding shall only maintain coiled configuration to prevent unwinding without squeezing the hose body.
Pre‑storage preparation is mandatory. Fully drain residual hydraulic oil and compressed media inside the hose. If residual media remain enclosed within coiled hoses, ambient temperature fluctuations generate internal pressure. Combined with bending stress from coiling, elevated internal pressure accelerates material aging. Storage environment also impacts preservation outcomes. Keep hoses out of direct sunlight and high‑heat sources, and isolate them from machine oil and chemical solvents. Ultraviolet radiation and oil contaminants embrittle outer jackets, reduce flexibility and increase cracking risks during subsequent deployment.
Heavy objects must never be stacked atop coiled hoses. Compressive loads cause local flattening and sharp creases, rendering hoses defective immediately once such damage occurs. Long‑term continuous coiled storage is not recommended for warehouse inventory. Periodically uncoil and straighten hoses to release accumulated static stress on tube walls. Never fold hoses prior to coiling, as folded zones form sharp creases that impair liners and braided reinforcement within short periods.
Coiled storage suits short‑term containment and transit rather than multi‑year long‑term preservation. For prolonged warehousing, adopt loosely formed large‑diameter coils to minimize bending‑induced static stress. When retrieving hoses, uncoil sequentially following the original winding direction instead of pulling forcefully on compact coils, which may introduce torsional distortion. Proper coiling practices preserve the original performance of Micro Test Hose and guarantee reliable pressure‑testing capacity. In contrast, tightly compacted small‑diameter coiling achieves a neat storage appearance yet silently undermines internal hose structures, bringing about various malfunctions after service activation.