Nipple · coupler · hose · stem
A larger thread does not always mean more flow
Match the hose, valves, coupler and packer to the material. The narrowest channel can limit the entire system's delivery rate.
Flow: how much material passes, and under what conditions
Passage size is stated in millimetres and output in litres per minute. Delivery rate also depends on material viscosity, hose length and working pressure.
Follow the material path in order, from the pump to the packer outlet. Replacing the nipple only helps if it is the component restricting flow.
Pressure rises while delivery slows: what does that tell you?
Pressure rising while material flow slows? Check the hose, valves and packer for restrictions, and check material condition. If the system is clear, resistance at the injection location may be the cause.
Before disconnecting, stop the pump and depressurise the system according to the equipment instructions. Do not disconnect pressurised components.
Trace the complete delivery path.
Choose a component to see what affects material delivery.
Match the pump to the material and delivery rate. Set working pressure for the injection task and the limits of the connected components.
Selection: material type, working pressure and delivery rate.Nipple passage is a dimension, not an output in litres
Compare passage diameters. A larger channel aids delivery if the other system components also allow the chosen material through.
Change the connection and compare channel size within the same packer outline.
M6x1 · SWG / PRE| Connection / type | Approximate passage | What it means for selection |
|---|---|---|
| M6x1, conical SWG / PRE | approximately 1 mm | Small passage; check the compatible conical coupler and the channel through the whole packer. |
| M6x1, flat-head FWG / FPRE | approximately 1,5 mm | Different coupler and connection method. The thread is still M6x1. |
| Plastic conical nipple; PI-P 12/65 example | approximately 2 mm | Value applies to the described design, not to all plastic packers. |
| Plastic flat-head nipple | approximately 3 mm | Check the specific packer model and connection compatibility. |
| Flat-head M10x1 / G 1/4 | approximately 4 mm | A larger connection passage may still be restricted by the stem channel. |
| CPC jaw connection, M10x1 / G 1/4 | approximately 7,5 mm | Large passage and slide valve; match the thread and system. |
M6x1 and M10x1 designate metric threads. G 1/4 is a separate imperial connection. Similar dimensions do not make these connections interchangeable. Check the thread, male or female side, and sealing method of both parts.
Material changes the demands on the same system
Viscosity and temperature
A more viscous material creates greater resistance in narrow channels. Match hose diameters and length to viscosity at working temperature. Account for the material's reaction time too.
If delivery rate changes, check the temperature and time since the material was prepared. Resin can thicken during work; adjusting the pump will not restore its original properties.
Particles, valves and filters
Cement suspension contains solid particles. It requires a pump, hose, valves and packer suitable for delivering them, particularly at the narrowest point of the system.
For selection, provide particle size, viscosity and required delivery rate. We use these details to select the complete suspension system.
Material residue changes the flow-path geometry
Deposits and cured material reduce the actual passage. A previously effective system can therefore deliver more slowly without any change in its markings. Check cleanliness and component condition before increasing maximum power or pressure.
From symptom to decision
| Observation | What to distinguish | Selection or inspection decision |
|---|---|---|
| Pressure rises, delivery is low | Resistance at the injection location, a narrowed passage or a blockage. | Identify the measurement point and all components. After depressurising, check for blockages as instructed. |
| Delivery rate stays similar after changing the nipple | The restriction may remain in the stem, coupler or an earlier part of the system. | Compare passages in the hose, coupler, nipple and packer channel. |
| Delivery changes over time | Material conditions, system temperature, contamination or equipment condition. | Check material working time, temperature and component condition. The pressure gauge alone is not enough. |
| Material leaks at the coupler or thread | A leaking connection: pump delivery no longer equals the amount entering the structure. | Check connection geometry, condition and sealing method. Correct the cause before continuing work. |
The thread fits, but is the whole system compatible?
Match a conical coupler to a conical nipple and a flat-head coupler to a flat-head nipple. Also check the thread, seal and channel diameter. Both nipple types can have the same M6×1 thread.
The pump setting must stay within the limit of every connected component: hose, head, coupler and packer.
A larger connection.
The same channel.
The two example packers have the same body, seal and stem channel. The nipple changes. A larger thread does not remove a restriction further down the system.
Changing the nipple does not enlarge the stem channel. Check the passage in the specific packer separately.