4/3C-AH Slurry Pump Packing Seal Emergency Leak Repair: Injection Packing vs. Fast Gland Packing Replacement

Subtitle: Sudden heavy leakage without stopping? Injection packing stops leak in 3 minutes; traditional packing replacement requires 1-hour shutdown – comparison and selection guide

Introduction

The 4/3C-AH is a compact AH series slurry pump (100mm discharge, 75mm inlet), widely used in small to medium concentrators and heavy media coal preparation. After prolonged operation, the gland packing may develop sudden heavy leakage due to packing wear, water supply interruption, or shaft sleeve wear. Slurry spray not only contaminates the environment but also can erode bearings and the motor. Operators often face a dilemma: stop the pump (losing production) or continue running (increasing risk).

Based on years of field emergency experience, Hebei Xingou Machinery Equipment Co., Ltd. has developed two emergency repair methods for packing seal leakage: injection packing (no shutdown) and fast gland packing replacement (short shutdown). This article compares their principles, procedures, applications, and effectiveness to help users make quick decisions.

1. Common Causes of Sudden Packing Leakage

When the gland is already fully compressed but still leaks, or when the seal water system fails and cannot be restored, emergency leak repair is necessary.

2. Method 1: Injection Packing (No‑Stop Leak Repair)

2.1 Principle and Material

Injection packing is a paste‑ or putty‑like polymer material (e.g., graphite‑PTFE based sealant). It is injected through a special gun into the stuffing box via the injection port (or through a removed packing ring). It fills voids between the packing and shaft sleeve, then cures to form an elastic seal. No shutdown is required – the pump can remain running.

2.2 Procedure

2.3 Pros and Cons

3. Method 2: Fast Gland Packing Replacement (Short Shutdown)

3.1 Procedure

Suitable when short shutdown (10-30 minutes) is acceptable. Hebei Xingou Machinery recommends keeping pre‑cut packing rings on site.

3.2 Fast Replacement Tips

• Pre‑cut packing rings: Cut to shaft sleeve circumference in advance, mark size, keep as spare.

• Layer by layer: Do not stuff all rings at once; install sequentially for better density.

• Emergency substitute: If no spare packing, use oil‑soaked asbestos rope or canvas tape (very short life).

3.3 Pros and Cons

4. Comparison and Selection Decision

5. Field Case: Coal Preparation Plant 4/3C-AH Emergency Repair

Background: A 4/3C-AH pump developed sudden heavy packing leakage (slurry spraying). Seal water pressure was normal but leakage could not be stopped. The production line could not be shut down.

Emergency solution: Injection packing (Hebei Xingou Machinery provided gun and sealant).

Procedure:

• Cleaned injection port, installed adapter.

• Injected about 150ml of injection packing, held pressure for 2 minutes.

• Wiped excess, allowed 15 minutes to cure.

Result: Leakage stopped completely. The pump ran for 2 months until a scheduled shutdown, when conventional packing was installed.

Cost comparison: Injection packing material 28, avoided down time loss approx 2000.$28,�������������������������\mathrm{.}$

6. Preventive Recommendations

Conclusion

When sudden heavy leakage occurs from the packing seal of a 4/3C-AH slurry pump, choose the emergency solution based on site conditions: if shutdown is impossible → injection packing (5-10 minutes, temporary fix); if short shutdown is acceptable → fast packing replacement (20-30 minutes, long‑term reliable). Hebei Xingou Machinery Equipment Co., Ltd. recommends keeping both emergency materials on hand and training operators regularly. For technical guidance on emergency leak repair, please contact our technical team.