10 Grit Pump Start Up
The Grit Pumps and Hydrogritter operate independently of each other. During normal operation, influent (containing grit) is pumped by the Influent Pumps to the Influent Distribution Box/Grit Chamber. The Grit Chamber is equipped with four grit hoppers. The Grit Pumps pump grit from the hopper to the Hydrogritter.
The Grit Pumps isolate and remove grit from the influent stream and further treatment processes by transferring it to the Hydrogritter. The removal of grit is important because it can clog and/or damage piping, valves and other equipment.
- Verify that the suction and discharge valves are open.
- Verify that the grit hopper isolation valves are open.
- Verity that the suction and discharge header flushing valves are closed.
During normal operation, grit is transferred to the Hydrogritter. During abnormal conditions, the Hydrogritter is bypassed.
Operator I, knowledge of grit system and equipment controls.
- Record activity to log book.
- Monitor flow rates at the flowmeter. Low rates could indicate an obstruction.
1. At the Grit Pumps {tag nos. 1004PMP/MTR 0100 & 1004PMP/MTR0200}:
a. Locate the Grit Pump Suction Valves {tag nos. 1004VLV 0100 & 1004VLV0200} and open if they are closed.
b. Locate the Grit Pump Discharge Valves {tag nos. 1004VLV 0100A & 1004VLV0200A} and open if they are closed.
c. Locate the four Grit Hopper Isolation Valves {tag nos. 1004VLV0677B, 1004VLV0677D, 1004VLV0677H & 1004VLV0677J} and open if they are closed.
d. Locate the suction header flushing valves and close if they are open.
e. Locate the discharge header flushing valves and close if they are open.
f. Locate the Hydrogritter Isolation Valve {tag no. 1004VLV0676A} and open if it is closed.
g. Locate the Hydrogritter Bypass Isolation Valve {tag no. 1004VLV0676B} and close if it is open.
h. Verity that the Lockout Switch is in the ON position.
2. At the MCC (Automatic Control)
a. Locate the Grit Pump Bucket {tag nos. 1004BKT0100 & 1004BKT0200} at the MCC.
b. Locate the Grit Pump Breaker {tag nos. 1004FBK0100 & 1004FBK0200} and switch to ON.
c. Locate the Grit Pump HOA Switch {tag nos. 1004HS0100 & 1004HS0200} and switch to AUTO. The operator may choose to manually operate the pumps from the MCC by placing the HOA switch to HAND.
d. Locate the Grit Pump Run Indicator Light {tag nos. 1004YL0100 & 1004YL0200} and verify that it is on.
e. If the Fault Indicator Light {tag nos. 1004YL0100A & 1004HS0200A} indicates a fault, push the Reset Button.
3. At SCADA
a. Locate the SCADA Workstation.
b. Set the Grit Pump {nos. 1004PMP/MTR 0100 & 1004PMP/MTR0200} Lead/Lag assignments.
c. The Operator may change to manual control of the pumps at the SCADA screen by choosing HAND.
d. If the Fault Indicator shows fault, select RESET from the SCADA screen.
4. Verify Operation & Flow:
a. Locate the Hydrogritter Magnetic Flow Meter {tag no. 1004FE/FT0674} display unit near the Hydrogritter valve. The flow indicated should be approximately 170 gpm. If the flow falls below 140 gpm, one of the hoppers probably has an obstruction - click here for the Grit Hopper Obstruction SOP.
5. Observe Grit Pump Operation:
a. Listen for excessive noise or vibration.
b. Check for oil or process fluid leaks.
6. Record Data to Operator’s Log Book: Record Grit Pump Activities to the log book with other entries for the day. Include the following in the entry:
· Operator(s) that performed the Grit Pump Start Up SOP.
· Note condition of equipment, piping, valves, etc.
· Note any unusual conditions with flows, levels, odors or other process issues.
· Note any damage, wear, or required maintenance on equipment.
- Update log book.
- Update maintenance records (if applicable).
- Report any maintenance or attention that is required.
Grit flows to the Hydrogritter are at approximately 170 gpm.
If the flowmeter displays flows below 140 gpm one of the grit hoppers probably has an obstruction. Click here for the Grit Obstruction SOP.
EQUIPMENT NAME | TAG NUMBER |
Grit Hopper #1 Suction Valve | 1004VLV0677B |
Grit Hopper #2 Suction Valve | 1004VLV0677D |
Grit Hopper #3 Suction Valve | 1004VLV0677H |
Grit Hopper #4 Suction Valve | 1004VLV0677J |
Grit Transfer Pump Flow Sensor | 1004FE/FIT0674 |
Hydrogritter Isolation Valve | 1004VLV0676A |
Hydrogritter Bypass Isolation Valve | 1004VLV0676B |
Grit Pump No. 1 | 1004PMP0100 |
Grit Pump No. 1 Motor | 1004MTR0100 |
Grit Pump No. 1 Bucket | 1004BKT0100 |
Grit Pump No. 1 Breaker | 1004FBK0100 |
Grit Pump No. 1 HOA Switch | 1004HS0100 |
Grit Pump No. 1 Run Indicator Light | 1004YL0100 |
Grit Pump No. 1 Fail Indicator Light | 1004YL0100A |
Grit Pump No. 1 Suction Valve | 1004VLV0100 |
Grit Pump No. 2 | 1004PMP0200 |
Grit Pump No. 2 Motor | 1004MTR0200 |
Grit Pump No. 2 Bucket | 1004BKT0200 |
Grit Pump No. 2 Breaker | 1004FBK0200 |
Grit Pump No. 2 HOA Switch | 1004HS0200 |
Grit Pump No. 2 Run Indicator Light | 1004YL0200 |
Grit Pump No. 2 Fail Indicator Light | 1004YL0200A |