EVENT Date October (30) 2021
Description Standard Short Shaft on plinth
Goal Long term erosion / air volume tests
Team Darrell Markewitz
Neil Peterson (extracts)
Richard Schwitzer
FURNACE Type standard with taller shaft
Material EPK 
Walls cylinder / clay+sand+horse 6 to 3
Interior 28
Height 77
Stack 50
Base 15
Packing charcoal fines 13
Tuyere standard copper
Diameter 2
Angle 20
Proud 4
Air System standard electric blower + smelt bellows
Extraction bottom via arch
MATERIALS Ore DD 1 (red) 51% Fe
Charcoal Oak
EVENT AIR CHARCOAL ORE
CLOCK ELAPSED UNIT COUNT TOTAL Unit TOTAL
pressure LpM Gauge Total bucket kg kg kg
inch H2O plate flow volume 1.9
1200 start wood splints pre-heat
1230 30 gentle air -
1340 T 1:40 start rough charcoal 3 800 3 3 5.7
1348 8 start computer recording 11.4 655 1 4 7.6
1352 probe to settle 11.4 653 1 5 9.5
temps A - 1170/930/780/550/320/250
1402 B - 1180/1030/1190/800/780/610
1405 13 last rough / probed to settle 3.3 11.4 656 1 6 11.4
1417 12 switch to graded charcoal 11.4 655 1 7 13.3
1430 13 11.4 656 1 8 15.2
temps A - 1135/1040/840/800/650/460
1439 B - 1180/1030/1190/800/780/610
1445 15 11.4 657 1 9 17.1
1458 13 11.5 659 1 10 19.0
1459 start bellows - Richard (1500.30) 9.4 541
1505 start bllows - Neil (1506.30) 2.5 to 3 8.5 491
1510 start bellows - Darrell (1511.30) 8.3 477
( return to blower)
1512 return to blower /increased (varies) 4 900 12.8 735
1515 17 effect of bellows use? 14 802 1 11 20.9
1521 temps A - 1210/1190/1190/1000/905/715
B - 1315/1350/ overload problem
1531 16 13.9 798 1 12 22.8
1544 13 start addition of iron slag 13.8 793 1 13 24.7 .75 S .75 S
1600 16 13.8 793 1 14 26.6 .75 S 1.5 S
1613 13 start addition of ore 13.8 791 1 15 28.5 1 O 1 O
1629 16 13.8 794 1 16 30.4 1 2
1644 15 4 13.8 794 1 17 32.3 1 3
1658 14 4.5 13.8 791 1 18 34.2 1 4
1705 bellows - Richard (1706.30) 2 to 4 9.6 549
1709 bellows - Neil (1710.30) 2 to 3.5 9.7 559
1712 bellows - Darrell (1712.30) 2 to 3 9.4 542
1713 return to blower / increased (1713.40) 5 1000 16.1 924
1716 18 temp A bottom only 1280 15 860 1 19 36.1 1 5
1729 13 14.6 840 1 20 38.0 1.5 6.5
1737 first slag tap (no visible air change)
1742 13 14.6 839 1 21 39.9 1.5 8
1755 13 14.6 837 1 22 41.8 1.5 9.5
1802 slag tap (no visible air change)
1806 11 14.6 840 1 23 43.7 1.5 11
1821 15 14.5 834 1 24 45.6 2 13
1835 E 14 E 14.5 833 1 25 47.5 2 15
1849 14 E large self tap (no visible air change) 14.4 828 1 26 49.4 2 17
1900 11 14.5 835 1 27 51.3 2 19
1916 16 14.4 829 1 28 53.2 2 21
1920 major self tap (no visible air change) 6
1929 13 5 13.1 758 1 29 55.1 2 23
1940 11 final addition of ore 14.5 833 1 30 57.0 1.3 24.3
1944 bellows - Richard (1944.15) 1 to 3 9.3 532
1945 bellows - Neil (1946.00) 2 to 3 8.5 487
bellows - Darrell 1947.45) 8.7 501
1948 8 start burn down 5 1000 14.8 851 1 31 58.9
2000 reduce air (2000.30) 3 800 11.1 640
2008 reduce air (2009.19) 2 700 7.3 421
2020 additional charcoal to cover 6.9 396 0.5 31.5 59.9
start extraction
air reduced (2048.14) 200 4.1 236
TOTALS
Charcoal total 60 kg
average : minutes per kg 8
Ore total 24.3 kg
average : minutes per kg 9
iron slag added 1.5 kg
Bloom 7.6 kg
Gromps
Yield 31 %
Condition a bit spongy
Quality
Slag  all left where deposited kg